The Journal of prosthetic dentistry最新文献

{"title":"Multifactorial comparison of disk displacement with and without reduction to normals according to temporomandibular joint hard tissue anatomic relationships.","authors":"A. Pullinger, D. A. Seligman, M. John, S. Harkins","doi":"10.1067/MPR.2002.121742","DOIUrl":"https://doi.org/10.1067/MPR.2002.121742","url":null,"abstract":"STATEMENT OF PROBLEM\u0000There is disagreement about the predictive value of temporomandibular joint tomographic anatomy in the diagnosis of internal derangements.\u0000\u0000\u0000PURPOSE\u0000This study aimed to identify multifactorial temporomandibular hard tissue relationships that differentiate disk displacement with reduction and disk displacement without reduction from normals.\u0000\u0000\u0000MATERIAL AND METHODS\u0000Temporomandibular joint tomograms from females diagnosed with unilateral disk displacement with (n=84) or without (n=78) reduction were compared to 42 asymptomatic normal joints with the use of 14 linear and angular measurements and 8 ratios. A validated classification tree model was tested for accuracy with sensitivity, specificity, goodness of fit, and the amount of log likelihood accounted for. The tree model was compared with a multiple logistic regression model and univariate testing.\u0000\u0000\u0000RESULTS\u0000The disk displacement with reduction tree model consisted of 3 disease and 2 normal pathways with interactions between fossa width to depth ratio, condyle position, and linear posterior joint space. This class was characterized by either a much wider- and shallower-than-average fossa shape and/or by a moderately posterior condyle position when the fossa shape was average to deeper and/or narrower. The logistic regression and univariate models also suggested wider and/or shallower fossae, as well as longer eminence length. The disk displacement without reduction tree model consisted of 2 disease pathways and 1 normal pathway. Interactions characterized this class by either a posterior to very posterior condyle position or by a much deeper than average fossa depth when the condyle position was concentric to anterior. The logistic regression model emphasized greater fossa depth and width versus normals. The tree models conservatively predicted the disease classes: Rescaled Cox and Snell R(2) 37.0%, sensitivity 70.2%, and specificity 90.5% for disk displacement with reduction; R(2) 28.8%, sensitivity 66.7%, and specificity 85.7% for disk displacement without reduction.\u0000\u0000\u0000CONCLUSION\u0000Within the limitations of this study, hard tissue relationships revealed by central tomogram sections were able to model notable differences between disk displacement with reduction and disk displacement without reduction versus asymptomatic normals when temporomandibular joints were examined as a multifactorial system typified by interactions of fossa width to depth proportions and condyle position. While substantial, the hard tissue predicted only part of the biology. The model could be broadened by additional factors and interactions.","PeriodicalId":185384,"journal":{"name":"The Journal of prosthetic dentistry","volume":"197 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117621610","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of finishing and polishing procedures on the gap width between a denture base resin and two long-term, resilient denture liners.","authors":"I. Pesun, J. Hodges, J. H. Lai","doi":"10.1067/MPR.2002.122162","DOIUrl":"https://doi.org/10.1067/MPR.2002.122162","url":null,"abstract":"STATEMENT OF PROBLEM\u0000The junction between a long-term, resilient denture liner and the denture base is difficult to finish and polish due to differences in the hardness of the materials. Gaps tend to form during finishing and polishing procedures.\u0000\u0000\u0000PURPOSE\u0000This study measured the junctional gap between 2 long-term, resilient denture liners and a denture base material after different finishing and polishing procedures were performed. The surface smoothness of the 2 liner materials also was evaluated.\u0000\u0000\u0000MATERIAL AND METHODS\u0000Molloplast-B and an experimental, heat-polymerized methyl siloxane-resin-based denture liner were processed (according to the manufacturer's instructions) against Lucitone 199 acrylic resin. Control specimens (n = 20) were 2 mm thick and flat. Experimental specimens (n = 64) were fabricated with a raised center section: a 3- x 5- x 15-mm half-cylindrical ridge with a junction at the top of the cylinder between the liner material and acrylic resin. The specimens were finished with 1 of 6 types of burs and polished with different combinations of rubber-impregnated acrylic polishers, pumice, and tin oxide. The finished specimens were examined and photographed with a scanning electron microscope, and the largest gap along the liner/denture base junction on each specimen was measured. Three-way analysis of variance without replication (P<.05) and post-hoc t tests were used to analyze the data and compare groups. RESULTS; Averaged across finishing and polishing techniques, a larger gap was recorded for the experimental liner material (22 microm) than for Molloplast-B (14 microm) (P<.00005). Qualitative evaluation suggested that the experimental liner material polished better than Molloplast-B. The smoothest surfaces were obtained when specimens were finished with fine-tooth cross-cut carbide burs and polished with both pumice and tin oxide. A comparison between polished and unpolished specimens, averaged over materials and finishing techniques, revealed that polishing reduced gap size (P=.015).\u0000\u0000\u0000CONCLUSION\u0000Within the limitations of this study, the 2 denture liners tested behaved similarly. The results suggest that the size of the gap at the liner/denture base junction may be affected by finishing and polishing techniques and vary among materials.","PeriodicalId":185384,"journal":{"name":"The Journal of prosthetic dentistry","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120305402","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A procedure for making trial dentures.","authors":"J. Mamoun","doi":"10.1067/MPR.2002.122010","DOIUrl":"https://doi.org/10.1067/MPR.2002.122010","url":null,"abstract":"A procedure is presented for making trial dentures by arranging denture teeth in soft wax rather than hard baseplate wax. The drawbacks of using hard wax are thereby avoided.","PeriodicalId":185384,"journal":{"name":"The Journal of prosthetic dentistry","volume":"2017 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"118845098","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Use of an individual traction prosthesis and distraction osteogenesis to reposition osseointegrated implants in a juvenile with ectodermal dysplasia: a clinical report.","authors":"A. Čelar, G. Durstberger, K. Zauza","doi":"10.1067/MPR.2002.120844","DOIUrl":"https://doi.org/10.1067/MPR.2002.120844","url":null,"abstract":"This article describes the use of distraction osteogenesis to reposition osseointegrated maxillary implants in an adolescent girl with ectodermal dysplasia and oligodontia. The distraction of 2 osteotomized segments was controlled by a prosthesis fabricated specifically for this purpose.","PeriodicalId":185384,"journal":{"name":"The Journal of prosthetic dentistry","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125676721","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Flexural strength of provisional crown and fixed partial denture resins.","authors":"D. R. Haselton, A. Diaz-Arnold, M. Vargas","doi":"10.1067/MPR.2002.121406","DOIUrl":"https://doi.org/10.1067/MPR.2002.121406","url":null,"abstract":"STATEMENT OF PROBLEM\u0000Provisional prostheses are subject to flexure under function. Selection of the appropriate material for their fabrication is difficult given the limited evidence-based information on the flexural strength of provisional resins.\u0000\u0000\u0000PURPOSE\u0000This study compared the flexural strength of 5 methacrylate-based resins and 8 bis-acryl resins used to fabricate provisional crowns and fixed partial dentures.\u0000\u0000\u0000MATERIAL AND METHODS\u0000Bar-type specimens were fabricated according to American National Standards Institute/American Dental Association specification 27. After being immersed in artificial saliva at 37 degrees C for 10 days, the specimens were fractured under 3-point loading in a universal testing machine at a crosshead speed of 0.75 mm/min. Maximal loads to fracture in Newtons were recorded. Mean flexural strengths were calculated in MPa (n = 10 per group). Comparisons were made with analysis of variance and Duncan's multiple range test (P<.05).\u0000\u0000\u0000RESULTS\u0000Mean flexural strengths ranged from 56.2 to 123.6 MPa. There were 4 statistically similar groups. The group with the highest strengths consisted of 4 bis-acryl materials (Provipont, Integrity, Protemp 3 Garant, and Luxatemp).\u0000\u0000\u0000CONCLUSION\u0000Within the limitations of this study, flexural strengths were material- rather than category-specific. Some, but not all, bis-acryl resins demonstrated significantly superior flexural strength over traditional methacrylate resins.","PeriodicalId":185384,"journal":{"name":"The Journal of prosthetic dentistry","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128565824","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Clinical evaluation of all-ceramic crowns.","authors":"D. Gemalmaz, S. Ergin","doi":"10.1067/MPR.2002.120653","DOIUrl":"https://doi.org/10.1067/MPR.2002.120653","url":null,"abstract":"STATEMENT OF PROBLEM\u0000There are few in vivo studies on the clinical performance of all-ceramic crowns.\u0000\u0000\u0000PURPOSE\u0000The aim of this study was to evaluate the clinical performance of IPS Empress crowns.\u0000\u0000\u0000MATERIAL AND METHODS\u0000Thirty-seven all-ceramic IPS Empress crowns were placed in 20 patients. Twenty crowns were luted with Variolink II low-viscosity resin cement in combination with Syntac Classic dentin adhesive; the remaining 17 were luted with Variolink II in combination with Syntac Single Component. All procedural steps were performed by the same prosthodontist. Using the California Dental Association's (CDA) quality evaluation system, 2 calibrated evaluators examined the crowns for margin integrity, anatomic form, surface, and color for a period of 12 to 41 months, with a mean of 24.56 months after insertion. Kaplan-Meier statistical analysis was used to calculate the survival rate of the crowns. Values obtained for plaque and gingival conditions were compared to control teeth with use of the Wilcoxon signed ranks test (P<.05).\u0000\u0000\u0000RESULTS\u0000Based on the CDA criteria, 94.6% of the crowns were rated satisfactory. Fracture was registered in only 1 crown. One endodontically treated tooth failed due to the dislodgement of the prefabricated dowel. No significant difference was observed in the gingival health status of crowns that had margins placed above or at the level of the gingival margin. However, in crowns that had subgingival margin finish lines, the percentage of bleeding on probing was significantly higher than that of the contralateral control teeth.\u0000\u0000\u0000CONCLUSION\u0000In this in vivo study, IPS Empress crowns luted with both dentin bonding agents functioned satisfactorily with a relatively low fracture rate over a mean evaluation period of 24.56 months.","PeriodicalId":185384,"journal":{"name":"The Journal of prosthetic dentistry","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127186691","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"No association between incisal tooth wear and temporomandibular disorders.","authors":"M. John, H. Frank, F. Lobbezoo, M. Drangsholt, K. Dette","doi":"10.1067/MPR.2002.121167","DOIUrl":"https://doi.org/10.1067/MPR.2002.121167","url":null,"abstract":"STATEMENT OF PROBLEM\u0000Incisal tooth wear may be a sign of long-term bruxing behavior. Bruxism is purported to be a risk factor for temporomandibular disorders (TMD).\u0000\u0000\u0000PURPOSE\u0000The purpose of this clinic-based case-control study was to investigate whether the wear of anterior teeth is associated with TMD.\u0000\u0000\u0000MATERIAL AND METHODS\u0000Two hundred eight TMD patients and 172 control subjects were selected for participation. After exclusion of subjects with more than 1 missing premolar or molar zone in opposite arches, as well as subjects with missing or severely restored anterior teeth, 154 TMD patients and 120 control subjects were included in the study (age 31.2 +/- 13.4 years; range 13 to 76 years). Anterior tooth wear was assessed on casts with a 0 to 5 scale. A multiple logistic regression analysis, controlling for the effects of age and gender, was performed to investigate the relationship between tooth wear and TMD.\u0000\u0000\u0000RESULTS\u0000An odds ratio of 0.76 (95% confidence interval: 0.51 to 1.15) indicated that after adjusting for gender and age, the odds in favor of TMD decreased an estimated 24% for each additional unit of the mean tooth wear score. This result was not significant (P=.20).\u0000\u0000\u0000CONCLUSION\u0000Within the limitations of this study, incisal tooth wear (assessed on dental casts) was not significantly associated with TMD when the influence of age and gender was controlled. Based on these findings, a clinically relevant risk for TMD from incisal tooth wear can be excluded. Hence, the presented evidence does not support the idea that treatment of incisal tooth wear is indicated to prevent TMD.","PeriodicalId":185384,"journal":{"name":"The Journal of prosthetic dentistry","volume":"198 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126747760","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Laser digitization of casts to determine the effect of tray selection and cast formation technique on accuracy.","authors":"M. Brosky, I. Pesun, Philip D Lowder, R. DeLong, J. Hodges","doi":"10.1067/MPR.2002.121240","DOIUrl":"https://doi.org/10.1067/MPR.2002.121240","url":null,"abstract":"UNLABELLED\u0000STATEMENT OF PROBLEM; Several studies have attempted to determine the ideal combination of dental materials and laboratory techniques to produce the most accurate dental cast. Most have made use of 2-dimensional manual measuring devices, which neglect to account for the dimensional changes that exist along a 3-dimensional surface.\u0000\u0000\u0000PURPOSE\u0000The purpose of this study was to determine the effect of impression tray selection and cast formation techniques on the dimensional change of a dental cast with the use of new, 3-dimensional optical digitizing technology.\u0000\u0000\u0000MATERIAL AND METHODS\u0000Multiple impressions of a machined steel die that resembled a dental arch were made with custom and stock impression trays and vinyl polysiloxane impression material. The impressions were poured in type V artificial dental stone and allowed to set with the tray inverted or noninverted. The steel master die and stone casts were digitized with the Steinbichler Comet 100 Optical Digitizer, which was developed at the Minnesota Dental Research Center for Biomaterials and Biomechanics. Three-dimensional images of the stone casts were aligned to the 3-dimensional image of the master die and analyzed with AnSur-NT software. Multiple measurements of the master die and stone casts were analyzed to determine the accuracy of the 3-dimensional technology and of the impression and cast fabrication techniques. Planar distances between the center of each crown preparation were measured, as were crown heights. Data were analyzed with analysis of variance (P<.05), and root mean square error values were determined.\u0000\u0000\u0000RESULTS\u0000Casts were compared with a total of 45 significance tests, of which only 4 yielded P<.05. There was no pattern to these results, which suggests that they were false-positive findings.\u0000\u0000\u0000CONCLUSION\u0000Results obtained with the use of new optical digitizing technology indicated that neither impression tray type nor cast formation technique affected the accuracy of final casts.","PeriodicalId":185384,"journal":{"name":"The Journal of prosthetic dentistry","volume":"115 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128117675","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A laboratory technique for custom incisal guidance.","authors":"D. Carrier","doi":"10.1067/MPR.2001.119416","DOIUrl":"https://doi.org/10.1067/MPR.2001.119416","url":null,"abstract":"lenging and laborious. Establishing proper anterior guidance in provisional restorations or in an existing dentition is paramount before placing the definitive fixed prostheses.1,2 This technique is a modification of one previously introduced by Clements3 and provides an adjunct to the custom incisal guide table. It enables an accurate duplication of the lingual contours to be used in the final restoration of maxillary anterior teeth.","PeriodicalId":185384,"journal":{"name":"The Journal of prosthetic dentistry","volume":"93 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"119124535","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Repair of fractured connectors in a provisional fixed partial denture.","authors":"D. Appleby","doi":"10.1067/MPR.2001.118566","DOIUrl":"https://doi.org/10.1067/MPR.2001.118566","url":null,"abstract":"THE JOURNAL OF PROSTHETIC DENTISTRY 449 The functions of a provisional fixed partial denture include pulpal protection, maintenance of periodontal health, stabilization of tooth position, maintenance or improvement of occlusal function, and the establishment or continuation of desired esthetic contour.1,2 A fractured connector may lead to the loss or dislodgement of a retainer, which may result in occlusal disharmony, food impaction, esthetic embarrassment, and the violation of all the stated goals. Many proactive techniques have been advocated to counter the potential for connector fracture. These include increasing the dimensions of the connector,2 reinforcing the connector with metal wires or plates,3 and fabricating the connector with heat-polymerized acrylic resin reinforced with cast metal substructures4-6 or with autopolymerizing acrylic resin with cast metal.7 Despite such preventive measures, connectors still break. A common method for the repair of a fractured or missing margin is the brush paint-on technique,8 which is also called the bead-brush technique.2 The surface of the restoration that requires additional material is moistened with monomer, and a paint brush is dipped into the monomer. The wet brush is gently touched to the surface of an aliquot of polymer, “forming a small bead on the [brush] tip.”2 This bead is carried to the surface of the restoration, allowed to set in a moist, “air-free” environment (closed mouth) to reduce porosity, and finished and polished. If used to repair a broken connector (cracked, but no substance missing), this technique will result in overcontour and subsequent esthetic and periodontal compromise. However, the sections can be “readily repaired by cutting retentive sections on each side of the broken area and utilizing the brush technique to paint autopolymerizing acrylic resin to weld the 2 together.”8 This paint-on technique, applied to intracoronal preparations of the adjacent components, assures a repair of the connector that is strong, esthetic, and appropriately contoured. The following is a modification of the slot technique, which incorporates the design features of a Class II preparation. The open proximal boxes and dovetails permit more convenient placement of acrylic resin and may, by virtue of design, provide for a stronger union between the parts. Definitive refinement of the occlusal and axial contours remains uncompromised.","PeriodicalId":185384,"journal":{"name":"The Journal of prosthetic dentistry","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"119085861","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}