Zafer C. Cehreli
Publications
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Effect of bleaching agents on sealing properties of different intraorifice barriers and root filling materials.
Medicina oral, patologia oral y cirugia bucal. 02/2012;
Objective: To evaluate the effect of intracoronal bleaching agents on the sealing properties of different intraorifice barriers and root filling materials. Study Design: The root canals of extracted human premolars (n=180) were prepared by using System GT rotary files and filled with either gutta-pe... [more] Objective: To evaluate the effect of intracoronal bleaching agents on the sealing properties of different intraorifice barriers and root filling materials. Study Design: The root canals of extracted human premolars (n=180) were prepared by using System GT rotary files and filled with either gutta-percha+AH Plus or Resilon+Epiphany sealer. In both groups, the coronal 3mm of root filling was removed and replaced with one of the following materials applied as intraorifice barriers (n=30/group): 1. ProProot-MTA; 2. Conventional Glass ionomer cement; and 3. Hybrid resin composite. In each subgroup, intracoronal bleaching was performed using either sodium perborate with distilled water or 35% hydrogen peroxide gel for 3 weeks. The leakage of specimens was measured using fluid-filtration and dye penetration tests. The data were analyzed statistically with One-way ANOVA, Repeated Measures t-test and Independent Samples t-test (p=0.05). Results: The fluid conductance values of the test groups were not influenced by the type of the bleaching agent, the intraorifice barrier, or the root filling material (all p>0.05). However, the extent of dye leakage was significantly affected by the type of intraorifice barrier material (p<0.05), which showed the following statistical ranking: glass ionomer cement > resin composite > ProRoot-MTA (p<0.05). Conclusions: The effect of 35% hydrogen peroxide gel or sodium perborate/distilled water on the sealing properties of tested intraorifice barriers and root filling materials varied conforming leakage assessment. These properties were not affected by using fluid filtration test, while the glass ionomer barrier showed the greatest amount of dye leakage in both gutta-percha and Resilon root-filled teeth.
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2.95Impact points
Dentin moisture conditions affect the adhesion of root canal sealers.
Journal of endodontics. 02/2012; 38(2):240-4.
The purpose of this study was to evaluate the effects of intraradicular moisture conditions on the push-out bond strength of root canal sealers. Eighty root canals were prepared using rotary instruments and, thereafter, were assigned to 4 groups with respect to the moisture condition tested: (1) eth... [more] The purpose of this study was to evaluate the effects of intraradicular moisture conditions on the push-out bond strength of root canal sealers. Eighty root canals were prepared using rotary instruments and, thereafter, were assigned to 4 groups with respect to the moisture condition tested: (1) ethanol (dry): excess distilled water was removed with paper points followed by dehydration with 95% ethanol, (2) paper points: the canals were blot dried with paper points with the last one appearing dry, (3) moist: the canals were dried with low vacuum by using a Luer adapter for 5 seconds followed by 1 paper point for 1 second, and (4) wet: the canals remained totally flooded. The roots were further divided into 4 subgroups according to the sealer used: (1) AH Plus (Dentsply-Tulsa Dental, Tulsa, OK), (2) iRoot SP (Innovative BioCeramix Inc, Vancouver, Canada), (3) MTA Fillapex (Angelus Indústria de Produtos Odontológicos S/A, Londrina, Brasil), and (4) Epiphany (Pentron Clinical Technologies, Wallingford, CT). Five 1-mm-thick slices were obtained from each root sample (n = 25 slices/group). Bond strengths of the test materials to root canal dentin were measured using a push-out test setup at a cross-head speed of 1 mm/min. The data were analyzed statistically by two-way analysis of variance and Tukey tests at P = .05. Irrespective of the moisture conditions, iRoot SP displayed the highest bond strength to root dentin. Statistical ranking of bond strength values was as follows: iRoot SP > AH Plus > Epiphany ≥ MTA Fillapex. The sealers displayed their highest and lowest bond strengths under moist (3) and wet (4) conditions, respectively. The degree of residual moisture significantly affects the adhesion of root canal sealers to radicular dentin. For the tested sealers, it may be advantageous to leave canals slightly moist before filling.
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0.96Impact points
Revascularization of immature permanent incisors after severe extrusive luxation injury.
Journal (Canadian Dental Association). 01/2012; 78:c4.
Pulp necrosis is an uncommon sequel to extrusive luxation in immature teeth with incomplete apical closure. In this report, we describe the management of severely extruded immature maxillary incisors and the outcome of revascularization to treat subsequent pulp necrosis. An 8.5-Year-old boy with sev... [more] Pulp necrosis is an uncommon sequel to extrusive luxation in immature teeth with incomplete apical closure. In this report, we describe the management of severely extruded immature maxillary incisors and the outcome of revascularization to treat subsequent pulp necrosis. An 8.5-Year-old boy with severe dentoalveolar trauma to the anterior maxillary region as a result of a fall was provided emergency treatment consisting of reduction of the dislodged labial cortical bone and repositioning of the central incisors, which had suffered extrusive luxation. When he presented with spontaneous pain involving the traumatized incisors a week later, the teeth were treated via a revascularization protocol using sodium hypochlorite irrigation followed by 3 weeks of intracanal calcium hydroxide, then a coronal seal of mineral trioxide aggregate and resin composite. Complete periradicular healing was observed after 3 Months, followed by progressive thickening of the root walls and apical closure. Follow-up observations confirmed the efficacy of the regenerative treatment as a viable alternative to conventional apexification in endodontically involved, traumatized immature teeth.
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2.95Impact points
Regenerative endodontic treatment (revascularization) of immature necrotic molars medicated with calcium hydroxide: a case series.
Journal of endodontics. 09/2011; 37(9):1327-30.
Revascularization is an emerging regenerative treatment protocol with little published data available in immature molar teeth. The present case series demonstrates the outcome of revascularization treatment with intracanal medicament of calcium hydroxide in immature necrotic molars. Immature necroti... [more] Revascularization is an emerging regenerative treatment protocol with little published data available in immature molar teeth. The present case series demonstrates the outcome of revascularization treatment with intracanal medicament of calcium hydroxide in immature necrotic molars. Immature necrotic permanent first molars (n = 6) of patients 8-11 years old were treated by a revascularization protocol that used 2.5% NaOCl irrigation, medication with calcium hydroxide placed in the coronal third of the root canals, induction of apical bleeding, and coronal sealing with white mineral trioxide aggregate. Among the treated teeth, 4 molars had undergone prior root canal instrumentation by the referring dentists. National Institutes of Health Image-J program with TurboReg plug-in was used for standardization of the radiographs and to determine the increase in root length and root width. After a follow-up period of 10 months, all teeth demonstrated radiographic evidence of complete periapical healing, progressive thickening of dentinal walls, and continued apical development in the absence of clinical symptoms. Two uninstrumented molars showed a positive response to cold testing at 9 months. On the basis of a follow-up period of 10 months, the present cases demonstrate a favorable outcome of the revascularization procedure in immature necrotic molars by using calcium hydroxide medication in the coronal third of the root canals.
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0.96Impact points
Treatment of severe inflammatory root resorption in a young permanent incisor with mineral trioxide aggregate.
Journal (Canadian Dental Association). 08/2011; 77:b108.
Inflammatory root resorption is a pathologic condition caused by several etiologic factors including traumatic dental injury. In this case report, we describe treatment of a maxillary lateral incisor affected by severe, perforating inflammatory root resorption. An 11-year-old patient presented with ... [more] Inflammatory root resorption is a pathologic condition caused by several etiologic factors including traumatic dental injury. In this case report, we describe treatment of a maxillary lateral incisor affected by severe, perforating inflammatory root resorption. An 11-year-old patient presented with a previously traumatized, root-filled maxillary lateral incisor associated with pain, mobility and a sinus tract. Radiographic examination revealed a large periradicular lesion involving pathologic resorption of the apical region of the root. After removal of the root canal filling, the tooth was treated with intracanal calcium hydroxide for 2 weeks. The calcium hydroxide dressing was then removed and the entire root canal was filled with mineral trioxide aggregate. The endodontic access cavity was restored with composite resin. After 1 year, advanced osseous healing of the periradicular region had occurred and no clinical symptoms were apparent.
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2.22Impact points
Effect of plunger diameter on the push-out bond values of different root filling materials.
International endodontic journal. 07/2011; 44(10):950-5.
To evaluate the effect of plunger diameter on the push-out bond strength of different root filling materials to root canal dentine. Freshly extracted human incisors (n=90) were decoronated, and the root canals were enlarged with post drills. Prepared roots were placed into a custom alignment apparat... [more] To evaluate the effect of plunger diameter on the push-out bond strength of different root filling materials to root canal dentine. Freshly extracted human incisors (n=90) were decoronated, and the root canals were enlarged with post drills. Prepared roots were placed into a custom alignment apparatus to embed the roots vertically within self-curing acrylic resin. The specimens were randomly assigned into three groups according to the root filling system used: gutta-percha/AH Plus; Resilon/Epiphany; and fibre-reinforced composite (FRC)/Duolink resin cement. After filling, the specimens were further subdivided according to the diameter of the plunger used to employ the debonding force: 0.75, 1 and 1.25 mm. Intra-radicular bond strength was measured using the push-out test at a cross-head speed of 1 mm min(-1) . The data were analysed statistically using Kruskal-Wallis test with Bonferroni correction at P = 0.05. Regardless of the plunger diameter, FRC yielded the highest bond strength, followed by gutta-percha and Resilon, respectively (P<0.001). In all groups, greater plunger diameter resulted in an apparent increased bond strength, but the differences were only significant in the FRC group, with the 1.25-mm plunger generating higher debonding values compared with that of its 0.75- and 1-mm versions (P<0.001). In the gutta-percha and Resilon groups, the majority of specimens had adhesive failures. Roots filled with FRC exhibited more cohesive failures than those of the other test groups. Different plunger diameters are associated with significantly different intra-radicular push-out bond strengths of root filling systems.
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2.95Impact points
Effect of light-emitting diode photopolymerization modes on the push-out bond strength of a methacrylate-based sealer.
Journal of endodontics. 06/2011; 37(6):832-5.
The objective of this study was to investigate and compare the effect of different light-emitting diode (LED) polymerization modes on the bond strength of a methacrylate-based sealer used with Resilon or gutta-percha. Forty extracted single-rooted teeth were sectioned off below the cementoenamel jun... [more] The objective of this study was to investigate and compare the effect of different light-emitting diode (LED) polymerization modes on the bond strength of a methacrylate-based sealer used with Resilon or gutta-percha. Forty extracted single-rooted teeth were sectioned off below the cementoenamel junction, and the root canals were instrumented by using rotary instruments to ISO #30/0.06 taper. The roots were randomly assigned into 1 of the following groups for root canal obturation: (1) RealSeal + Resilon and (2) RealSeal + gutta-percha. In each group, specimens were further subgrouped according to the LED polymerization mode used to cure RealSeal: (1) standard (20 seconds of maximum intensity) and (2) exponential (5 seconds of exponential power increase, followed by 15 seconds of maximum intensity). Specimens were stored in 100% humidity for 1 week at 37 °C. Push-out test was performed at a crosshead speed of 1 mm/min on 2-mm-thick root slices obtained from coronal to apical direction. Multivariate analysis of variance and Tukey tests were used for statistical analysis of the data (P=.05). Failure modes were examined under the scanning electron microscope. The tested polymerization modes had no significant effect on the bond strength values (P > .05). RealSeal + gutta-percha yielded significantly greater bond strength than RealSeal + Resilon (P < .05). In all groups, the bond strength values decreased significantly from coronal to apical direction (P < .05). Adhesive failure at the sealer-dentin interface was the predominant fracture mode. The exponential photopolymerization mode had no significant advantage over the standard regimen in terms of dentin bond strength.
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2.95Impact points
Vasodilatory effect of hydroxyethyl methacrylate and triethylene glycol dimethacrylate in rat aorta through calcium antagonistic action.
Journal of endodontics. 03/2011; 37(3):353-7.
Resin-based dental materials contain various diluent monomers that can interfere with vascular function by causing vasodilation. In this study, we evaluated the vasoactive potential of hydroxyethyl methacrylate (HEMA) and triethylene glycol dimethacrylate (TEGDMA) and the possible mechanism of their... [more] Resin-based dental materials contain various diluent monomers that can interfere with vascular function by causing vasodilation. In this study, we evaluated the vasoactive potential of hydroxyethyl methacrylate (HEMA) and triethylene glycol dimethacrylate (TEGDMA) and the possible mechanism of their vascular action on isolated rat aorta. Responses of thoracic aorta rings were recorded isometrically by using force displacement transducers. After precontracting aorta rings with phenylephrine, relaxations to HEMA and TEGDMA were recorded in the absence and presence of nitric oxide synthase inhibitor N(ω)-nitro-L-arginine methyl ester, cyclooxygenase inhibitor indomethacin, and K(+) channel inhibitors tetraethylammonium, glibenclamide, and 4-aminopyridine. To investigate the Ca(2+)-channel antagonistic effect of HEMA and TEGDMA in different aorta rings, concentration-response curves to CaCl(2) were obtained in the absence and presence of the test monomers. Both HEMA and TEGDMA elicited concentration-dependent relaxations. The vasorelaxant effect of HEMA and TEGDMA was not mediated via endothelium-dependent nitric oxide and prostanoid-dependent mechanisms or by K(+) efflux through K(+) channels. Both monomers significantly inhibited the contractions induced by CaCl(2). Our results showed that HEMA and TEGDMA induce vasodilation via Ca(2+)-antagonistic action, whereas nitric oxide and cyclooxgenase pathway and K(+) channels were not responsible for this vasoactive effect.
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1.32Impact points
MTA apical plugs in the treatment of traumatized immature teeth with large periapical lesions.
Dental traumatology : official publication of International Association for Dental Traumatology. 02/2011; 27(1):59-62.
This case report describes the management of a late-referral case of periapically involved, traumatized immature permanent incisors by endodontic treatment and the use of mineral trioxide aggregate (MTA) apical plugs. A 10-year-old boy was referred to the clinic with a chief complaint of pain in his... [more] This case report describes the management of a late-referral case of periapically involved, traumatized immature permanent incisors by endodontic treatment and the use of mineral trioxide aggregate (MTA) apical plugs. A 10-year-old boy was referred to the clinic with a chief complaint of pain in his maxillary central incisors, which had experienced subluxation trauma 2 years earlier. Periapical radiograph of the teeth showed incomplete root development with wide-open apices and large periradicular lesions. The canals were gently debrided using K-files in conjunction with 2.5% NaOCl irrigation and 2% chlorhexidine for final flush. The root canals became asymptomatic after employing the same endodontic regimen for three visits. MTA plugs were placed in the apical area of the root canals, and the rest of the canal space was obturated by warm compaction of gutta-percha and AH Plus sealer. Resolution of the large periapical lesions was observed 2 months after treatment. At 18 months, the periapical areas revealed radiographic evidence of bone healing. Following successful removal of the toxic content of the root canal, placement of MTA plugs resulted in both healing of the periradicular radiolucency and regeneration of the periapical tissue.
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1.32Impact points
Segmental alveolar process fracture involving primary incisors: treatment and 24-month follow up.
Dental traumatology : official publication of International Association for Dental Traumatology. 02/2011; 27(1):63-6.
Alveolar process fractures are particularly complicated by the developing jaws, the presence of tooth germs and the eruption of permanent teeth. The present report describes the management and 24-month follow up of a segmental mandibular alveolar process fracture involving laterally luxated primary ... [more] Alveolar process fractures are particularly complicated by the developing jaws, the presence of tooth germs and the eruption of permanent teeth. The present report describes the management and 24-month follow up of a segmental mandibular alveolar process fracture involving laterally luxated primary incisors. A 5-year-old boy was admitted to the clinic 3 h after a fall accident, which resulted in the fracture of the mandibular alveolar process with substantial dislodgement of the buccal cortical bone and right primary incisors. Emergency treatment consisted of fracture reduction in the dislodged bone and repositioning of the primary incisors, followed by placement of a semi-rigid splint between mandibular canines and suturing of soft-tissue lacerations. The splints were removed at the end of week 3, and the affected primary incisors remained asymptomatic until natural exfoliation. At 24 months, Eruption of the permanent successors was almost complete in the absence of any sequel from prior trauma.
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0.98Impact points
A comparative study of qualitative and quantitative methods for the assessment of adhesive remnant after bracket debonding.
European journal of orthodontics. 01/2011;
The amount of the residual adhesive after bracket debonding is frequently assessed in a qualitative manner, utilizing the adhesive remnant index (ARI). This study aimed to investigate whether quantitative assessment of the adhesive remnant yields more precise results compared to qualitative methods ... [more] The amount of the residual adhesive after bracket debonding is frequently assessed in a qualitative manner, utilizing the adhesive remnant index (ARI). This study aimed to investigate whether quantitative assessment of the adhesive remnant yields more precise results compared to qualitative methods utilizing the 4- and 5-point ARI scales. Twenty debonded brackets were selected. Evaluation and scoring of the adhesive remnant on bracket bases were made consecutively using: 1. qualitative assessment (visual scoring) and 2. quantitative measurement (image analysis) on digital photographs. Image analysis was made on scanning electron micrographs (SEM) and high-precision elemental maps of the adhesive remnant as determined by energy dispersed X-ray spectrometry. Evaluations were made in accordance with the original 4-point and the modified 5-point ARI scales. Intra-class correlation coefficients (ICCs) were calculated, and the data were evaluated using Friedman test followed by Wilcoxon signed ranks test with Bonferroni correction. ICC statistics indicated high levels of agreement for qualitative visual scoring among examiners. The 4-point ARI scale was compliant with the SEM assessments but indicated significantly less adhesive remnant compared to the results of quantitative elemental mapping. When the 5-point scale was used, both quantitative techniques yielded similar results with those obtained qualitatively. These results indicate that qualitative visual scoring using the ARI is capable of generating similar results with those assessed by quantitative image analysis techniques. In particular, visual scoring with the 5-point ARI scale can yield similar results with both the SEM analysis and elemental mapping.
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1.32Impact points
Management of trauma-induced inflammatory root resorption using mineral trioxide aggregate obturation: two-year follow up.
Dental traumatology : official publication of International Association for Dental Traumatology. 12/2010; 26(6):501-4.
Inflammatory root resorption is a serious complication of dental trauma, which leads to progressive loss of the root structure. This report describes the treatment a previously traumatized young maxillary lateral incisor, severely affected by inflammatory root resorption. An 11-year-old boy presente... [more] Inflammatory root resorption is a serious complication of dental trauma, which leads to progressive loss of the root structure. This report describes the treatment a previously traumatized young maxillary lateral incisor, severely affected by inflammatory root resorption. An 11-year-old boy presented with pain and mobility in his maxillary incisors which experienced fall trauma 2 years earlier. Radiographic examination revealed incomplete root development of the right central incisor, associated with advanced inflammatory root resorption and a periapical lesion. Following removal of a prior long-term calcium hydroxide dressing, the root canal was submitted to a 2-week irrigation regimen involving 1.25% sodium hypochlorite and 2% chlorhexidine gluconate. Thereafter, the entire root was filled with mineral trioxide aggregate. The radiographic follow up at 6 months showed arrest of root resorption and initiation of periapical healing in the absence of clinical symptoms and mobility. This was followed by advanced osseous regeneration and re-establishment of the periodontal space at 12 and 24 months. From the present case, it can be concluded that mineral trioxide aggregate obturation can be a viable option that can improve the healing outcomes in cases of severe inflammatory root resorption in young permanent teeth.
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1.14Impact points
Number, length and end-rounding quality of bristles in manual child and adult toothbrushes.
International journal of paediatric dentistry / the British Paedodontic Society [and] the International Association of Dentistry for Children. 10/2010; 21(3):232-9.
The design of the bristles of a toothbrush can affect the overall efficacy of toothbrushing. To evaluate and compare a number of selected features associated with the bristle (length, number and end-rounding quality) of manual child and adult toothbrushes. The bristle lengths of 11 child and 29 adul... [more] The design of the bristles of a toothbrush can affect the overall efficacy of toothbrushing. To evaluate and compare a number of selected features associated with the bristle (length, number and end-rounding quality) of manual child and adult toothbrushes. The bristle lengths of 11 child and 29 adult toothbrushes were measured on digital micrographs using open source image analysis software. Bristles of tufts from five regions were counted and classified as acceptable or non-acceptable on stereomicroscopic images according to the end-rounding morphology. The data was evaluated statistically. The number of bristles were similar in child and adult toothbrushes (P > 0.05). Despite significant differences in bristle end-rounding in some regions (P < 0.05), the overall quality of bristles were similar in child and adult toothbrushes (P > 0.05). The variations observed in the number, length and end-rounding quality of the bristles indicate inherent shortcomings of a majority of the tested toothbrushes in plaque removal efficacy, along with the potential for irritation on the gums.
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1.50Impact points
Surface porosity of hand-mixed, syringe-mixed and encapsulated set endodontic sealers.
Oral surgery, oral medicine, oral pathology, oral radiology, and endodontics. 06/2010; 109(6):e117-22.
The objective of this study was to investigate the surface porosity of hand-mixed, syringe-mixed and encapsulated set endodontic sealers using image analysis. Eight different root canal sealers (AD Seal/Meta Biomed; AH Plus/Dentsply; MM Seal/Micromega; AH Plus Jet/Dentsply; EndoREZ/Ultradent; Epipha... [more] The objective of this study was to investigate the surface porosity of hand-mixed, syringe-mixed and encapsulated set endodontic sealers using image analysis. Eight different root canal sealers (AD Seal/Meta Biomed; AH Plus/Dentsply; MM Seal/Micromega; AH Plus Jet/Dentsply; EndoREZ/Ultradent; Epiphany/Pentron; GuttaFlow/Coltène; RealSeal/Sybron Endo) were prepared in accordance with the manufacturer's recommendations and dispensed into plastic rings (n = 10/group). Following set of the specimens, scanning electron photomicrographs of the sealer surfaces were taken at standard magnification. The area fraction and the minimum-maximum diameters of surface pores were calculated on the micrographs using ImageJ open-source image analysis software. Statistical comparisons were made between the sealers with respect to the area fractions and number of pores (Kruskal-Wallis test, P < .05). The endodontic sealers differed significantly in both the percentage of area fraction and pore count (P < .001). The surface porosity of the methacrylate-based sealers Epiphany and RealSeal were significantly lower than those of resin- and silicone-based sealers. With the exception of AD Seal, hand-mixed sealers displayed significantly higher surface porosity than those of syringe-mixed ones (P < .001). The encapsulated sealer GuttaFlow exhibited the highest surface area fraction of pores. The mixing method influences the surface porosity of set endodontic sealers.
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2.95Impact points
Effect of different intraorifice barriers on the fracture resistance of roots obturated with Resilon or gutta-percha.
Journal of endodontics. 06/2010; 36(6):1061-3.
This study investigated and compared the root reinforcement potential of 3 different intraorifice barriers (mineral trioxide aggregate [MTA], resin-modified glass ionomer cement [Vitremer], and fiber-reinforced composite [FRC]) placed over root canals obturated with gutta-percha or Resilon. Crowns o... [more] This study investigated and compared the root reinforcement potential of 3 different intraorifice barriers (mineral trioxide aggregate [MTA], resin-modified glass ionomer cement [Vitremer], and fiber-reinforced composite [FRC]) placed over root canals obturated with gutta-percha or Resilon. Crowns of 80 extracted human mandibular premolars were sectioned off to obtain 14-mm-long root specimens. After preparation of root canals with nickel-titanium rotary files, the roots were obturated with either the Resilon/Epiphany system or gutta-percha + AH Plus sealer. In both obturation groups, specimens were further subgrouped with respect to the intraorifice barrier material placed after removal of 3-mm coronal portion of the root fillings: (1) MTA, (2) Vitremer, and (3) FRC. The specimens were loaded vertically at 1 mm/min crosshead speed until vertical root fracture occurred. Results were evaluated statistically with two-way analysis of variance and Tukey tests. Fracture resistance of roots was significantly affected by the type of intraorifice barrier (P < .05), but not by the type of obturation system used (P > .05). The use of Vitremer and FRC significantly improved the fracture resistance, whereas MTA did not exhibit any reinforcing effect as an intraorifice barrier.
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1.32Impact points
Fracture resistance of tooth fragment reattachment: effects of different preparation techniques and adhesive materials.
Dental traumatology : official publication of International Association for Dental Traumatology. 02/2010; 26(1):9-15.
The purpose of this study was to evaluate and compare the bond strengths of experimentally fractured human tooth fragments reattached with different adhesive materials and retentive techniques in vitro. Uncomplicated crown fractures were obtained on intact human mandibular permanent incisors by appl... [more] The purpose of this study was to evaluate and compare the bond strengths of experimentally fractured human tooth fragments reattached with different adhesive materials and retentive techniques in vitro. Uncomplicated crown fractures were obtained on intact human mandibular permanent incisors by applying perpendicular load to the buccal aspect of tooth crowns. Fractured teeth were randomly assigned into one of three reattachment protocols: (i) Simple reattachment, (ii) Overcontour preparation, and (iii) Internal dentin groove. The first and second groups were divided into 10 subgroups, and the third group into five subgroups (n = 10 per group) with respect to five different adhesive systems (Prime&Bond NT, Adper Single Bond II, Adper Prompt L-Pop, Clearfil S(3) Bond, G Bond) used with or without a hybrid resin composite (Z250). Restored teeth were subjected to thermal cycling, and subsequently to the same loading protocol used for fracturing intact teeth. Fracture strength after reattachment procedures was recorded as a percentage of the original fracture strength. Both type of adhesive material and placement of an intermediate layer of resin composite affected the fracture resistance (P < 0.05). The highest fracture strength recovery was obtained using the internal dentin groove technique (54 +/- 0.58%, P < 0.05), followed by the overcontour and simple reattachment protocols (49 +/- 0.58% and 32 +/- 0.82%, respectively, P < 0.05). Ultramorphological evaluation of bonded specimens revealed voids and microcracks along the adhesive interface, which might contribute to postadhesive failure.
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Inadvertent MTA extrusion in an immature traumatized permanent incisor.
The Journal of clinical pediatric dentistry. 01/2010; 35(2):145-8.
This report describes the 24-month clinical and radiographic outcome of an unintentionally extruded mineral trioxide aggregate (MTA) apical plug. A 9 year old boy presented with a previously traumatized, immature central incisor; associated with a large periradicular lesion. During placement of MTA ... [more] This report describes the 24-month clinical and radiographic outcome of an unintentionally extruded mineral trioxide aggregate (MTA) apical plug. A 9 year old boy presented with a previously traumatized, immature central incisor; associated with a large periradicular lesion. During placement of MTA in the treatment of wide open apex, the material was inadvertently extruded into the periapical region upon a sudden movement of the child. No intervention was made, except for obturation of the remaining root canal two weeks later. The radiographic follow up at 12 and 24 months confirmed successful management through the non surgical approach, as evidenced by advanced healing of the periapical lesion and regeneration of the periradicular tissue in the absence of clinical symptoms.
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2.51Impact points
Vasorelaxant effects of Clearfil SE Bond and Clearfil S(3) Bond mediated by calcium antagonistic action.
Journal of biomaterials science. Polymer edition. 01/2010; 21(8-9):997-1007.
Dental adhesives can alter the contractility of vascular tissue via different mechanisms. The aim of this study was to investigate and compare the vascular action of two self-etch adhesive systems, Clearfil SE Bond (CSEB) and Clearfil S(3) Bond (CS3B). Responses of isolated rat thoracic aorta rings ... [more] Dental adhesives can alter the contractility of vascular tissue via different mechanisms. The aim of this study was to investigate and compare the vascular action of two self-etch adhesive systems, Clearfil SE Bond (CSEB) and Clearfil S(3) Bond (CS3B). Responses of isolated rat thoracic aorta rings were recorded isometrically by force displacement transducers. Following pre-contraction of aorta rings, relaxations to the independent and mixed components of CSEB and CS3B were recorded in the absence and presence of nitric oxide synthase (NOS) inhibitor (N(omega)-nitro-L-arginine methyl ester (N-LAME)), cyclooxygenase (COX) inhibitor (indomethacin) and K+ channel inhibitors (tetraethylammonium, glibenclamide and 4-aminopyridine). We also tested the effects of CSEB and CS3B in endothelium-intact and -denuded rat thoracic aorta rings. To investigate the Ca2+-channel antagonistic effect of adhesive components, concentration-response curves to CaCl2 were obtained in the absence and presence of the components. The primer, the bond, and the mixture of CSEB and CS3B elicited concentration-dependent relaxations. Mechanical rubbing of the endothelium did not significantly modify the extent of vasorelaxation induced by the test materials. The vasorelaxant effect was mediated neither by NOS and COX inhibition nor by the tested K+ channel antagonists. Mechanical removal of the endothelium did not alter the vasodilatory effect induced by the self-etch adhesives. Both CSEB and CS3B significantly inhibited the contractions induced by CaCl2. These results demonstrate the vasodilatory effect induced by the self-etch adhesive systems through a Ca2+-antagonistic effect.
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1.50Impact points
Sealing efficiency of BeeFill 2in1 and System B/Obtura II versus single-cone and cold lateral compaction techniques.
Oral surgery, oral medicine, oral pathology, oral radiology, and endodontics. 12/2009; 108(6):e51-5.
OBJECTIVE: The objective of this study was to investigate the sealing properties of 2 warm vertical compaction techniques (BeeFill 2in1, System B/Obtura II) in comparison with single-cone and cold laterally compacted gutta-percha. STUDY DESIGN: The root canals of single-rooted human teeth were prepa... [more] OBJECTIVE: The objective of this study was to investigate the sealing properties of 2 warm vertical compaction techniques (BeeFill 2in1, System B/Obtura II) in comparison with single-cone and cold laterally compacted gutta-percha. STUDY DESIGN: The root canals of single-rooted human teeth were prepared by using Mtwo rotary files and divided into 4 groups (n = 10/group) with respect to the filling technique tested: Group 1, cold laterally compacted gutta-percha + AH-26; Group 2, single-cone tapered Mtwo gutta-percha + AH-26; Group 3, System B/ObturaII + AH-26; Group 4, BeeFill 2in1 + 2seal. The leakage of specimens was measured using a fluid-filtration method after 1 and 2 weeks. The data were analyzed statistically with 2-way repeated measures ANOVA (P = .05). RESULTS: After 1 week, the System B/Obtura II group showed the greatest amount of leakage(P < .05) compared with the other test groups that had similar levels of fluid conductance(P < .05). By the end of the second week, the BeeFill group yielded the greatest amount of leakage (P < .05). Compared with their 1-week values, the fluid conductance of all test groups decreased significantly (P < .05). CONCLUSION: The apical sealing efficiency of System B/Obtura II and BeeFill were inferior to the other obturation techniques after 2-week fluid conductance testing in vitro.
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1.64Impact points
Shear Bond Strength Between a Polyester-based Root Canal Filling Material and a Methacrylate-based Sealer with an Intermediate Layer of Fiber-reinforced Resin-based Material.
The journal of adhesive dentistry. 09/2009; 11(4):325-30.
Following (10)
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Pergin Atilla
Hacettepe Üniversitesi Ana Sayfasi -
Ceyhan Altun
Gulhane Military Medical Academy -
Johannes Kleinheinz
Universitätsklinikum Münster -
Taskin Gurbuz
Ataturk University -
Sevi Burçak Cehreli
Baskent University
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