Montse Mercadé

Universitat Internacional de Catalunya, Barcino, Catalonia, Spain

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Publications (14)28.55 Total impact

  • [show abstract] [hide abstract]
    ABSTRACT: Difficult handling, long setting time, and potential discoloration are important drawbacks of white mineral trioxide aggregate (WMTA). The development of Biodentine, a recently developed calcium silicate-based material (CSM), has overcome some of these shortcomings; however, there are no available data on its color stability. A previous study showed that WMTA discolors under light irradiation in an oxygen-free environment. The present study evaluated the influence of light irradiation and oxygen on the color stability of 5 CSMs. Fifteen samples of 5 CSMs (ProRoot WMTA, Angelus WMTA, White Portland Cement [PC], PC with bismuth oxide, and Biodentine) were divided into 5 groups. Each group was exposed to different oxygen and light conditions. A spectrophotometer was used to determine the color of each specimen at 0, 120 seconds, and 5 days. Data were analyzed by using analysis of variance and Tukey honestly significant difference test. The materials PC with bismuth oxide, Angelus WMTA, and ProRoot WMTA showed dark discoloration after light irradiation in an oxygen-free environment, which was statistically significantly different from Biodentine and PC. In groups that were exposed to no light irradiation or to an oxygen atmosphere, all materials showed color stability over time, and no significant differences were observed among them. PC and Biodentine maintained color stability in all conditions over time and showed no significant differences. The combination of light and anaerobic conditions (similar to those in clinical situations) results in differences in color of the tested CSMs during a period of 5 days, of which Biodentine and PC demonstrated color stability.
    Journal of endodontics 04/2013; 39(4):525-8. · 2.95 Impact Factor
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    ABSTRACT: The purpose of this study was to compare the prevalence of apical periodontitis (AP) on individual roots of teeth with irreversible pulpitis viewed with periapical (PA) radiographs and cone-beam computed tomography (CBCT) scans. PA radiographs and CBCT scans were taken of 138 teeth in 130 patients diagnosed with irreversible pulpitis (symptomatic and asymptomatic). Two calibrated examiners assessed the presence or absence of AP lesions by analyzing the PA and CBCT images. A consensus was reached in the event of any disagreement. The data were analyzed using the hypothesis test, and significance was set at P ≤ .05. Three hundred seven paired roots were assessed with both PA and CBCT images. A comparison of the 307 paired roots revealed that AP lesions were present in 10 (3.3%) and absent in 297 (96.7%) pairs of roots when assessed with PA radiography. When the same 307 sets of roots were assessed with CBCT scans, AP lesions were present in 42 (13.7%) and absent in 265 (86.3%) paired roots. The prevalence of AP lesions detected with CBCT was significantly higher in the symptomatic group compared with the asymptomatic group (P < .05). An additional 22 roots were identified with CBCT alone. The present study highlights the advantages of using CBCT for detecting AP lesions, especially in teeth with symptomatic irreversible pulpitis.
    Journal of endodontics 12/2012; 38(12):1588-91. · 2.95 Impact Factor
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    ABSTRACT: BACKGROUND: Although multiple materials have been suggested for pulpotomized primary molars, there is no reliable evidence of the superiority of one particular type. AIM: To compare the effectiveness of formocresol (FC), mineral trioxide aggregate (MTA), ferric sulphate, and sodium hypochlorite (NaOCl) as pulp dressing agents in primary molars after 2 years. DESIGN: One hundred primary molars requiring pulp treatment were allocated randomly to the control (FC) and experimental groups (MTA, ferric sulphate, and NaOCl). Clinical and radiographic evaluations were performed at 6, 12, 18, and 24 months. Statistical analysis using Fischer's exact test was performed to determine the significant differences between groups. RESULTS: In the FC and MTA groups, 100% of the available teeth were clinically successful at all follow-up appointments. In the NaOCl group, one clinical failure was found at 18 months, and two clinical failures in the ferric sulphate group were noted at 12 and 24 months, but no significant differences were found among the groups (P = 0.41). No significant differences in radiographic success were found among all the groups at 24 months of follow-up (P = 0.303). CONCLUSIONS: No statistically significant differences among the four materials were found at 24 months suggesting that NaOCl may be an appropriate substitute for FC.
    International Journal of Paediatric Dentistry 11/2012; · 0.92 Impact Factor
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    ABSTRACT: The Raypex 5 is a fourth-generation electronic apex locator for which the accuracy in the presence of chlorhexidine (CHX) and ethylenediaminetetraacetic acid (EDTA) has not yet been tested in vivo. The aim of this in vivo study was to evaluate the performance of the Raypex 5 electronic apex locator in the presence of different irrigant solutions: 2.5% sodium hypochlorite (NaOCl), 2% CHX, and 17% EDTA. Thirty-four single-rooted human teeth that were scheduled for extraction were selected for the study. Measurements were performed with the Raypex 5 in the presence of different irrigant solutions: 2.5% NaOCl, 2% CHX, and 17% EDTA. After the teeth were extracted, a #10 K-file was used to determine the reference working length (RWL), which was established to 0.5 mm from the major foramen. The measurements of WL obtained with the different irrigants were compared by analysis of variance. Significance was set at P < .05. No significant differences were found among the experimental groups (P = .18). The mean distance from the RWL to the file tip was -0.26 ± 1.14 mm when 17% EDTA was used, -0.03 ± 0.92 mm for 2% CHX, and 0.22 ± 0.93 mm for 2.5% NaOCl. The Raypex 5 performed equally well irrespective of the irrigant used.
    Journal of endodontics 08/2012; 38(8):1075-7. · 2.95 Impact Factor
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    ABSTRACT: Inflammatory external root resorption (IERR) requires damage or loss of the protective layer and an inflammatory process in the unprotected root surface. Infection of the pulp space can occur after a serious injury and stimulate an inflammatory response. When the inflammatory stimulus is long-standing, the destructive phase will continue until the stimulation is removed. This article describes the use of cone-beam computed tomography scanning in the diagnosis and management of a perforating IERR in tooth #10 with a 17-month follow-up and histologic examination after extraction for orthodontic reasons. The histologic examination showed a cementum-like tissue interposed within the dentin defect. The cementum-like tissue was eosinophilic and irregular or poorly demarcated in some parts. Fibrous ligament tissue and no inflammatory response could be identified. Mineral trioxide aggregate was shown to be suitable for the treatment of perforating IERR, and this finding agrees with the results observed in different studies conducted with animals.
    Journal of endodontics 07/2012; 38(7):1007-11. · 2.95 Impact Factor
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    ABSTRACT: The aim of the study was to evaluate apical transportation of root canals after the use of RaCe (FKG Dentaire, La-Chaux-de-Fonds, Switzerland) and ProFile (Dentsply Tulsa Dental, Tulsa, OK) 40/.04 rotary files. A double-digital radiographic technique was used to compare apical transportation between the RaCe and ProFile systems. Mesial canals from 80 extracted mandibular molars were instrumented using each rotary system. The central axes of the file imaged before instrumentation (#15 K-file) and the master apical rotary file (#40/.04) were superimposed digitally. AutoCAD was used to measure apical transportation at 0.5 mm from the working length (1.5 coronal to the major foramen). The data were analyzed using the Student's t test, and significance was set at P < .05. The mean amount of apical transportation at 0.5 mm was 0.17 ± 0.01 mm for the ProFile group and 0.16 ± 0.01 mm for the RaCe group. No statistically significant differences in apical transportation were found between the 2 groups. Under the conditions of the study, no statistically significant differences in apical transportation were observed between ProFile and RaCe rotary files.
    Journal of endodontics 07/2012; 38(7):990-2. · 2.95 Impact Factor
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    ABSTRACT: The aim of this study was to evaluate apical transportation in root canals after the use of Twisted Files (TF; SybronEndo, Orange, CA) and FlexMaster (VDW, Munich, Germany) #40/04 rotary files. A double-digital radiographic technique was used to compare apical transportation between the TF and FlexMaster systems. Each rotary system was used to instrument mesial canals from 80 extracted mandibular molars. The central axes of the file imaged before instrumentation (#15 K-file) and the master apical rotary file (#40/04) were superimposed digitally. AutoCAD 2008 (Autodesk Inc, San Rafael, CA) was used to measure apical transportation at 0.5 mm from the working length (WL). The data were analyzed using the Student's t test, and significance was set at P < .05. The mean amount of apical transportation at 0.5 mm from the WL was 0.17 ± 0.09 mm for the FlexMaster group and 0.19 ± 0.12 mm for the TF group. No statistically significant differences in apical transportation were found between the 2 groups. Under the conditions of the study, no statistically significant differences in apical transportation were observed between FlexMaster and TF rotary files.
    Journal of endodontics 07/2012; 38(7):993-5. · 2.95 Impact Factor
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    ABSTRACT: The purpose of the study was to compare the accuracy of the Root ZX electronic apex locator (J Morita Corp, Tokyo, Japan) between an in vivo and an in vitro model. The working length (WL) was determined electronically for 46 root canals of human teeth with a 15 K-file using both in vitro (n = 23) and in vivo (n = 23) models. The files were fixed at the WL. The apical 4 mm of each canal was trimmed to expose the file tip. The samples were observed under a scanning electron microscope, and the distance from the file tip to the point 0.5 mm coronal to the major foramen (the final WL) was measured. The data were analyzed using the Student t test, and significance was set at P ≤ .05. The statistical analysis revealed no significant differences between the in vivo group and in vitro group with respect to the accuracy of the Root ZX device in determining the final WL. The mean distance from the final WL to the file tip was 0.23 ± 0.39 mm for the in vivo group and 0.29 ± 0.32 mm for the in vitro group. In determining the final WL, the Root ZX was accurate 78.3% of the time to ±0.5 mm and 100% of the time to ±1 mm in the in vivo group, whereas it was accurate 74% of the time to ±0.5 mm and 100% of the time to ±1 mm in the in vitro group. No statistically significant differences were observed between the in vivo group and the in vitro group.
    Journal of endodontics 02/2012; 38(2):236-9. · 2.95 Impact Factor
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    ABSTRACT: The purpose of this study was to compare the accuracy in vivo of 2 electronic apex locators (EALs), the Raypex 5 and the Mini Apex Locator. The working length (WL) was determined electronically for 40 human root canals by using a K-file and 1 of the 2 EALs. The files were fixed at the WL, and the teeth were extracted. The apical 4 mm of each canal was trimmed to expose the file tip. The samples were observed under a scanning electron microscope, and the distance from the file tip to the point 0.5 mm coronal to the major foramen (the final WL) was measured. The data were analyzed by using Student t test, and significance was set at P < .05. No statistically significant differences were found between the Raypex 5 and the Mini Apex Locator devices. The mean distance from the final WL to the file tip was 0.174 ± 0.38 mm for the Raypex 5 and 0.286 ± 0.30 mm for the Mini Apex Locator. In determining the final WL, the Raypex 5 was accurate 75% of the time to ± 0.5 mm and 100% of the time to ± 1 mm, whereas the Mini Apex Locator was accurate 77.8% of the time to ± 0.5 mm and 100% of the time to ± 1 mm. Under the in vivo conditions of this study, no statistically significant differences were observed between the Raypex 5 and the Mini Apex Locator EALs.
    Journal of endodontics 10/2011; 37(10):1349-52. · 2.95 Impact Factor
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    ABSTRACT: Root fractures occur more frequently in fully erupted permanent teeth with closed apices in which the completely formed root is solidly supported in the bone and periodontium. The consequences can be complex because of combined damage to the pulp, dentine, cementum, bone, and periodontium. Management of horizontal root fractures and lateral luxation depends on several factors, with the result that various clinical modalities have been suggested. This case report describes the treatment and 10-year follow-up of two maxillary central incisors, one with horizontal root fracture and the other with lateral luxation, treated with mineral trioxide aggregate and root canal treatment, respectively.
    Dental Traumatology 07/2011; 27(6):460-3. · 1.00 Impact Factor
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    ABSTRACT: Invasive cervical resorption is a relatively uncommon form of external root resorption that may lead to tooth loss. This article presents the clinical and radiologic diagnoses and treatment modalities of invasive cervical resorption in 2 patients. In the first case, we did a slow orthodontic forced eruption to make the bone grow coronally. After 6 months, the tooth was extracted and an immediate implant was placed. Eight months later a zirconia crown was cemented. In the second case, we performed root canal treatment followed by a composite reconstruction of the defect. These 2 cases illustrate different approaches based on the extent of the defect.
    Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and Endodontology 10/2010; 110(4):e64-9. · 1.50 Impact Factor
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    ABSTRACT: To evaluate the optical integration and fluorescence of three contemporary restorative materials used for incisoproximal restorations. A microfilled hybrid composite (Amaris, VOCO; MHC), a nanofilled hybrid composite (Grandio, VOCO; NHC), and an experimental ormocer (VOCO; ORM) were used to consecutively restore 10 extracted incisors with incisoproximal restorations using the natural layering concept, mimicking the natural anatomy of the tooth. Before and after placement of each restoration, the teeth were photographed under standardized conditions (direct, indirect, and fluorescent light), and spectrophotometric measurements (SpectroShade, Handy Dental Type 713000, MHT) were made using a black-and-white background. Between measurements, the teeth were allowed to rehydrate for 2 weeks. Ten independent evaluators scored each light condition using an optical integration score on a scale from 0 to 10 (0 = worst optical integration, restoration can be easily distinguished from remaining tissue; 10 = optimal optical integration). Differences in L*a*b and DE values and optical integration scores were statistically analyzed using ANOVA. MHC obtained the highest optical integration and fluorescence scores (P < .01), followed by NHC, although there were no statistically significant differences found among DE of the restorative materials. ORM achieved the worst optical integration and fluorescence. The microfilled hybrid composite obtained the highest optical integration scores (P < .01), followed by the nanofilled hybrid composite. The experimental ormocer showed the least favorable optical behavior. Spectrophotometric measurements showed no statistically significant differences among all three restorative materials.
    Quintessence international (Berlin, Germany : 2010). 05/2010; 41(10):837-44.
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    ABSTRACT: The aim of this study was to compare the microtensile bond strength of three different total etch adhesives: XP Bond (Caulk-Dentsply) versus Excite (Ivoclar/Vivadent) and Prime & Bond NT (Caulk-Dentsply). Forty two (42) third human molars were cut to expose the dentinal surface. They were divided into three groups of 14 teeth (GI: XP Bond, G2: Excite, G3: Prime & Bond NT) and two groups of seven teeth for each moisture condition: moist dentin (GM) and dry dentin, (GD). The total-etch technique was used with each moisture variation. The adhesives and composites A3 (Ceram Duo GI, G3 and Tetric Ceram G2) were applied according to manufacturer's instructions. Teeth were cut with an ISOMET 1000 (Buehler Ltd.) to obtain 1 mm2 x 10 mm bars, which were subject to a traction test at 5 mm/min in a universal testing machine (Adamel Lhomargy DY 36). The collected data were recorded and analyzed using an experimental design for studying two factors offixed effrcts with software Statgraphics version 5.1. For the variable type of adhesive, we found p = 0.000, for the variable substrate condition, p = 0.0012, and for interaction between both factors, p = 0.0457, which indicates significant statistical differences. The values for microtensile bond strength were G1M = 55.0642 MPa Standard deviation (SD) 3.09768; G1D 39.115 MPa SD 2.86789; G2M 34.1607 MPa SD 2.86789; G2D = 32.7373 MPa SD 2.77065; G3M 3 7.3407 MPa SD 2.86789 and G3D = 31.0593 MPa SD 2.77065. XP Bond showed the greatest values of micmtensile bond strength under both conditions. Moist substrate increases the values of micmtensile bond stren gth]br the adhesives tested; howeve, Excite shows lower susceptibility to variation of dentinal moisture.
    Acta odontológica latinoamericana: AOL 01/2009; 22(1):47-56.
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    ABSTRACT: The purpose of this study was to determine the antimicrobial efficacy of sodium hypochlorite adjusted to pH 12, 7.5, and 6.5 in human root canals infected by Enterococcus faecalis. One hundred sixty-five human single-rooted teeth were prepared and inoculated with E. faecalis for 48 h. Teeth were divided into 3 experimental groups according to the irrigation pattern used: group 1, 4.2% NaOCl pH 12; group 2, 4.2% NaOCl pH 7.5; and group 3, 4.2% NaOCl pH 6.5. Samples from the root canals were collected, and bacterial growth was analyzed by turbidity of the culture medium. None of the irrigating solutions used in this study demonstrated 100% effectiveness against E. faecalis. The antibacterial effectiveness of 4.2% NaOCl at pH 6.5 was significantly increased (P = .03) compared with 4.2% NaOCl at pH 12 (chi-squared test: P < .05). Bactericidal activity of NaOCl solution is enhanced by weak acidification of 4.2% NaOCl solution at pH 6.5.
    Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and Endodontology 12/2008; 107(2):295-8. · 1.50 Impact Factor