Journal of Prosthetic Dentistry (J PROSTHET DENT)

Publications in this journal

• Article: Stylohyoid complex ossification in temporomandibular disorder: A case-control study

  Francisco Carlos Sancio-Gonçalve, Mauro Henrique Nogueira Guimarães de Abreu, José Mário Netto Soares, Sérgio Antonucci Amaral, Fernando Marques Barbosa Porfírio, Marcelo Drummond Naves, Evandro Neves Abdo
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  ABSTRACT: Statement of problem. Stylohyoid complex ossification (SCO) can be associated with temporomandibular disorder (TMD). However, this subject is poorly investigated in epidemiological studies. Purpose. The purpose of this study was to assess the association between TMD and SCO. Material and methods. Seventy-eight individuals with TMD and 93 control individuals without TMD were enrolled in a case-control study and paired according to age and gender. Panoramic radiographs were made of all participants, and SCO was measured in millimeters (mm) by a blinded researcher. Ossification was held to begin at measurements of 30 mm or more. The association between symptoms (pain upon swallowing or turning the head and the sensation of a foreign body in the throat) and SCO was investigated. Pearson chi-square tests were used for the comparison of proportions, (�=.05). Results. A total of 44.9% of those with TMD and 46.2% of the control population exhibited SCO (P=.858). TMD was associated with pain upon swallowing (P<.05) and upon turning the head P<.01), but there were no associations between the symptoms possibly related to SCO and the presence of ossification (pain upon swallowing P=.658; sensation of a foreign body in the throat P=.980; pain upon turning the head P=.405). Conclusions. The results suggest that there are no associations between TMD and SCO. Some symptoms classically associated with SCO also occur in TMD patients.
  Journal of Prosthetic Dentistry 02/2013; 109(2):79-82.
• Article: The influence of upper lip length and lip mobility on maxillary incisal exposure

  Phillip Roe, Kitichai Rungcharassaeng, Joseph Y K Kan, Rishi D Patel, Wayne V Campagni, James S Brudvik
  Journal of Prosthetic Dentistry 01/2011;
• Article: Auricular Prosthetic Design and Manufacturing using Computed Tomography, 3D Photogarphic IMaging and Rapid Prototyping

  Liacouras P, Garnes J, Roman R, Grant GT
  Journal of Prosthetic Dentistry 01/2011; 105(2):80-82.
• Article: News from the editorial council.

  Carol A Lefebvre
  Journal of Prosthetic Dentistry 08/2008; 100(1):A13-4.
• Article: Method for fabrication of a custom occlusal template.

  Philip S Baker, Jimmy Londono
  Journal of Prosthetic Dentistry 07/2008; 99(6):492-3.
• Article: Obtaining maxillomandibular records and definitive impressions in a single visit for a completely edentulous patient with a history of combination syndrome.

  Tony Daher, Setrag Dermendjian, Steven M Morgano
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  ABSTRACT: Any attempt to reduce the number of dental visits for the fabrication of complete dentures is appreciated by both the dentist and the patient. This article illustrates clinical and laboratory procedures for making a 2-stage definitive impression combined with the recording of maxillomandibular relations in the same visit for a completely edentulous patient with maxillary anterior mobile soft tissues.
  Journal of Prosthetic Dentistry 07/2008; 99(6):489-91.
• Article: An occlusal guard for preventing and treating self-inflicted tongue trauma in a comatose patient: a clinical report.

  Sudarat Kiat-Amnuay, Sheila H Koh, David J Powner
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  ABSTRACT: This clinical report describes the treatment of a 48-year-old patient who demonstrated neuropathologic and reflex mastication of her tongue after an intracerebral hemorrhage. Standard medical interventions failed to address the oral condition, and the attending neurosurgeon consulted the dental team. A provisional soft occlusal guard was initially placed, followed by fabrication of a heat-polymerized, acrylic resin occlusal guard. The tongue injury improved after placement of the oral device and administration of systemic hydrocortisone.
  Journal of Prosthetic Dentistry 07/2008; 99(6):421-4.
• Article: Condylar guidance: correlation between articular morphology and panoramic radiographic images in dry human skulls.

  Ilan Gilboa, Harold S Cardash, Israel Kaffe, Martin D Gross
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  ABSTRACT: Several studies have shown the unreliability of recording and reproducing the condylar guidance in semiadjustable articulators. The purpose of this study was to determine the correlation between the anatomic shape of the articular eminence and the corresponding panoramic radiographic image in dry skulls. Two metal wires were adapted and fixed to the inner and outer surfaces of the articular eminences in 25 human skulls. The inner (thicker) wire was fixed to the middle of the most concave aspect of the articular eminence in an anterior-posterior direction. The outer (thinner) wire was attached to the inferior aspect of the zygomatic arch adjacent to the articular eminence. Panoramic radiographic images were recorded by the same operator at the same time and with the same panoramic radiographic unit (Orthoralix SD). Impressions were made of the condylar fossae in 25 human dry skulls. Tracings of the incline of the articular eminence on the panoramic radiographs and the impression sections were compared. Each measurement was repeated twice by 2 operators. The results were subjected to the Pearson correlation statistical analysis (alpha=.05). The outline of the articular eminence in a panoramic radiographic image was identified as a thinner superior radio-opaque line above a thicker radio-opaque outline of the inferior-lateral aspect of the zygomatic arch. A significant correlation was found between the sagittal inclination of the anatomic articular eminence outline and the corresponding panoramic radiographic image for both right (R=0.802; P=.001) and left (R=0.561; P=.004) sides. A significant correlation was found between articular eminences on left and right sides in the same skull (P=.025). The panoramic radiographic image of the sagittal inclination of the articular eminence consistently replicated the eminence inclinations in the 25 human skulls evaluated.
  Journal of Prosthetic Dentistry 07/2008; 99(6):477-82.
• Article: Modification of interim removable partial denture using thermoplastic vacuum-formed matrix.

  Won-Suk Oh, Seung-Eun Kim
  Journal of Prosthetic Dentistry 07/2008; 99(6):494-6.
• Article: Influence of airborne-particle abrasion on mechanical properties and bond strength of carbon/epoxy and glass/bis-GMA fiber-reinforced resin posts.

  Carlos Jose Soares, Fernanda Ribeiro Santana, Janaina Carla Pereira, Tatiana Santos Araujo, Murilo Souza Menezes
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  ABSTRACT: Controversy exists concerning the use of fiber-reinforced posts to improve bond strength to resin cement because some precementation treatments can compromise the mechanical properties of the posts. The purpose of this study was to analyze the influence of airborne-particle abrasion on the mechanical properties and microtensile bond strength (MTBS) of carbon/epoxy and glass/bis-GMA fiber-reinforced resin posts. Flexural strength (delta(f)), flexural modulus (E(f)), and stiffness (S) were assessed using a 3-point bending test for glass fiber-reinforced and carbon fiber-reinforced resin posts submitted to airborne-particle abrasion (AB) with 50-microm Al(2)O(3), and for posts without any surface treatment (controls) (n=10). Forty glass fiber (GF) and 40 carbon fiber (CF) posts were submitted to 1 of 4 surface treatments (n=10) prior to MTBS testing: silane (S); silane and adhesive (SA); airborne-particle abrasion with 50-microm Al(2)O(3) and silane (ABS); airborne-particle abrasion, silane, and adhesive (ABSA). Two composite resin restorations (Filtek Z250) with rounded depressions in the lateral face were bilaterally fixed to the post with resin cement (RelyX ARC). Next, the specimen was sectioned with a precision saw running perpendicular to the bonded surface to obtain 10 bonded beam specimens with a cross-sectional area of 1 mm(2). Each beam specimen was tested in a mechanical testing machine (EMIC 2,000 DL), under stress, at a crosshead speed of 0.5 mm/min until failure. Data were analyzed by 2-way ANOVA followed by Tukey HSD test (alpha=.05). Failure patterns of tested specimens were analyzed using scanning electron microscopy (SEM). The 3-point bending test demonstrated significant differences among groups only for the post type factor for flexural strength, flexural modulus, and stiffness. The carbon fiber posts exhibited significantly higher mean flexural strength (P=.001), flexural modulus (P=.003), and stiffness (P=.001) values when compared with glass fiber posts, irrespective of surface treatment. An alteration in the superficial structure of the posts could be observed by SEM after airborne-particle abrasion. MTBS testing showed no significant effect for the surface treatment type; however, significant effects for post system factor and for interaction between the 2 factors were observed. For the carbon fiber post, the ABSA surface treatment resulted in values significantly lower than the S surface treatment. SEM analysis of MTBS-tested specimens demonstrated adhesive and cohesive failures. Airborne-particle abrasion did not influence the mechanical properties of the post; however, it produced undesirable surface changes, which could reduce the bond strength to resin cement. For the surface treatments studied, if silane is applied, the adhesive system and airborne-particle abrasion are not necessary.
  Journal of Prosthetic Dentistry 07/2008; 99(6):444-54.
• Article: The effect of metal ceramic restoration framework design on tooth color.

  Vanessa L Swain, Igor J Pesun, James S Hodges
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  ABSTRACT: The opacity of the metal framework in metal ceramic restorations results in reduced light transmission through the tooth that diminishes the esthetics of the tooth. The purpose of this study was to investigate the color change that occurs apically to a metal ceramic restoration as a result of altering the metal framework design. Color change relative to the unprepared tooth (DeltaE) between various metal ceramic restorations was determined using computer imaging and CIELAB coordinates and compared to previously determined levels of clinical acceptability. Color change was evaluated by examining 2 conditions (the metal copings and the completed metal ceramic restorations), 4 framework designs (metal collar and porcelain margins with 0-mm, 1-mm, or 2-mm cutbacks), and 2 locations on the tooth apical to the margin of the restoration, using an imaging system developed at the Minnesota Dental Research Center for Biomaterials and Biomechanics. The data were analyzed statistically using repeated measures analysis of variance (P=.05). For metal ceramic restorations there exists a significant (P=.001) color change (DeltaE) between all framework designs except for the 0-mm and 1-mm cutbacks. Color change (DeltaE) in the location above the cemento-enamel junction was significantly greater (P=.004) than below the cemento-enamel junction. The framework design for metal ceramic restorations can affect the esthetics of the adjacent natural tooth. A minimum 2-mm facial cutback of the metal framework is necessary for there to be a significant difference in color change.
  Journal of Prosthetic Dentistry 07/2008; 99(6):468-76.
• Article: Initial stability measurement of dental implants placed in different anatomical regions of fresh human cadaver jawbone.

  Wook-Jin Seong, James E Holte, James R Holtan, Paul S Olin, James S Hodges, Ching-Chang Ko
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  ABSTRACT: Initial implant stability has been used as an indicator for future osseointegration and whether an immediate/early loading protocol should be applied. However, differences in initial stability in relation to anatomical regions of jawbone have not been studied extensively because of the risks involved with stability measurements. The purpose of this study was to determine whether initial implant stability varies with anatomical regions of the jawbone. Four pairs of edentulous maxillae and mandibles were retrieved from fresh human cadavers. Six implants (Biomet 3i) per pair were placed in different anatomical regions (maxillary anterior, right and left maxillary posterior, mandibular anterior, right and left mandibular posterior). Immediately after implant placement, initial implant stability was measured with a custom-made resonance frequency analyzer, a commercial resonance frequency analysis device (Osstell), and a mechanical tapping device (Periotest). All implant surgeries and initial stability measurements were performed within 72 hours of death to simulate a clinical setting. Repeated measures ANOVA (alpha=.05) and univariate correlation analyses were used to analyze the data. Mandibular implants had significantly higher initial stability than maxillary implants. Posterior maxillary implants were least stable. Stability was less buccolingually than mesiodistally. The measurements from 3 stability measuring devices were strongly associated with each other. Initial implant stability varied among anatomical regions of jawbone. Rank of Periotest value and implant stability quotient (Osstell) had the highest correlation (r=-0.852).
  Journal of Prosthetic Dentistry 07/2008; 99(6):425-34.
• Article: Evaluation of the wear resistance of new nanocomposite resin restorative materials.

  Zeynep Duymus Yesil, Satish Alapati, William Johnston, Robert R Seghi
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  ABSTRACT: The use of composite resins for the restoration of posterior teeth is popular because of the improved performance and appearance of these materials. Wear resistance continues to be of particular importance when restoring large occlusal areas in posterior teeth. The purpose of this study was to evaluate the relative wear characteristics of 2 recently introduced nanofiller-based composite resins (Filtek Supreme, Premise) and compare them to the more traditional microhybrid (Point 4) and microfill (Heliomolar RO) materials that have been used for many years. Six specimens (2 mm thick and 15 mm in diameter) of each material were subjected to 3-body wear tests using the Oregon Health Sciences University Oral Wear Simulator to produce abrasive wear and attrition for all specimens using human enamel as the opposing cusp. Profilometric tracings of the worn surfaces were used to determine the relative abrasive wear, attrition wear, and roughness (Ra) of the composite resin substrate. The mean diameter of the antagonist enamel wear facets was determined under a measuring microscope. Qualitative SEM analysis was also used to assess the surface appearance of the resulting enamel and composite resin wear facets. The data were analyzed by 1-way ANOVA and Tukey's multiple range post hoc test (alpha=.05). The results indicated that the composite resin type did not significantly affect the amount of measured attrition (P=.15) but did significantly affect abrasive wear (P=.02). The conventional microfill composite resin (Heliomolar RO) exhibited significantly less abrasive wear than the nanohybrid material (Premise). There was no significant difference in the average size of the opposing enamel wear facet generated by the different composite resin materials. Heliomolar RO resulted in a significantly rougher surface within the wear track than either nanohybrid composite resin (Premise) or microhybrid composite resin (Point 4) but was not significantly different than nanofilled composite resin (Filtek Supreme). The incorporation of nanofillers in 2 of the composite resin materials tested did not significantly improve their wear resistance or the amount of opposing cusp wear when compared to the traditional materials tested.
  Journal of Prosthetic Dentistry 07/2008; 99(6):435-43.
• Article: The effect of different reinforcements on the fracture toughness of materials for interim restorations.

  Greta A V M Geerts, Jan-Hendrik Overturf, Theuns G Oberholzer
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  ABSTRACT: Fracture of an interim fixed partial denture (FPD) may jeopardize the success of the interim prosthodontic treatment phase and cause patient discomfort. The purpose of this study was to compare the fracture toughness of a polymethyl methacrylate (PMMA) resin and a bis-acryl composite (BAC) resin reinforced with stainless steel wire, glass fiber, and polyethylene fiber. Four groups (n=13) of each of the 2 materials were prepared for the single-edge notch 3-point-bending test. Three groups had the different reinforcements, and the group without reinforcement served as the control. Using a universal testing machine, peak load to fracture was recorded and fracture toughness (K(IC)) was calculated in MNm(-1.5). Median K(IC) values were compared by means of nonparametric ANOVA (Kruskal-Wallis test, alpha=.05). For the controls, the fracture toughness for PMMA resin (K(IC)=27.9) was significantly lower (P<.01) than for BAC resin (K(IC)=31.2). Glass fibers and stainless steel wire reinforcements produced significantly higher fracture toughness for both PMMA (K(IC)=34.4, P<.01, and K(IC)=39.0, P<.001, respectively) and BAC resin (K(IC)=42.3, P<.001, and K(IC)=44.0, P<.001, respectively), but the polyethylene fibers did not (K(IC)=25.8, P>.10, for PMMA resin and K(IC)=33.1, P>.10, for BAC resin). There was no significant difference between the fracture toughness of the wire and glass fiber reinforcements for both interim materials (P>.10 in both instances). Of the 3 reinforcement methods evaluated, wire and glass fiber reinforced the PMMA and BAC resin materials best.
  Journal of Prosthetic Dentistry 06/2008; 99(6):461-7.
• Article: Prefabricated pressure earring for earlobe keloids.

  Yigal Savion, Mordechai Sela
  Journal of Prosthetic Dentistry 06/2008; 99(5):406-7.
• Article: Adhesive retention of silicone and chlorinated polyethylene for maxillofacial prostheses.

  Sudarat Kiat-Amnuay, Patrick J Waters, Dianna Roberts, Lawrence Gettleman
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  ABSTRACT: A key factor of a successful facial prosthesis is the retention of the prosthesis to the patient's skin, especially when there is no mechanical means and the retention depends primarily on medical skin adhesives. Studies determining which medical adhesives provide the best bond strength for maxillofacial prostheses are needed. The purpose of this study was to quantify the force required to detach strips of Silastic Adhesive A/MDX4-4,210 silicone elastomer with a urethane liner (A/M-U) and experimental chlorinated polyethylene elastomer (CPE) from the skin of human subjects coated with a protective dressing using 1 of 2 medical adhesives. With IRB approval, 8 A/M-U and CPE rubber strips (total of 208) were applied in a predetermined random order to the left and right ventral forearms of 26 human subjects. Skin-Prep Protective Dressing (SP) was applied to half of the sites just before Epithane-3 (E3) and Secure(2) Medical Adhesive (SMA) were used to adhere the strips. Strips were peeled 6 hours later in a universal testing machine at 10 cm/min. Data are reported in newton/meter (N/m). The data was compared using a 3-way, within-groups, multivariate analysis of variance (MANOVA) and the Fisher exact test (alpha=.05). Values for N/m under various conditions relating to the subjects were compared by the Tukey HSD Test for unequal N (alpha=.05). Data are reported as mean (SD). Statistical analysis revealed no differences (mean (SD)) and no significant interactions between the independent variables (A/M-U = 94.6 (62.1) and CPE = 98.4 (69.6) N/m, SP = 93.0 (58.8) and no SP = 99.8 (72.1) N/m, E3 = 97.6 (69.8) and SMA = 95.3 (61.8) N/m; P=.984). Debonding occurred at the skin interface for both adhesives, as evidenced by residue on prosthetic materials (Fisher exact test; P<.005). The adhesive bond strengths of both SMA and E3, with and without the presence of SP, were not significantly different between A/M-U and CPE maxillofacial prosthetic materials. Adhesive failure occurred at the skin interface.
  Journal of Prosthetic Dentistry 06/2008; 99(6):483-8.