PURPOSE To determine if surface treatment and cement selection for traditional 3 mol% yttria partially stabilized zirconia (3Y-PSZ), "translucent" 5 mol% yttria-stabilized zirconia (5Y-Z), or lithium disilicate crowns affected their fracture load. MATERIALS AND METHODS Crowns with 0.8 mm uniform thickness (96, n = 8/group) were milled of 3Y-PSZ (Lava Plus), 5Y-Z (Lava Esthetic), or lithium disilicate (e.max CAD) and sintered/crystallized. Half the crowns were either particle-abraded with 30 μm alumina (zirconias) or etched with 5% hydrofluoric acid (lithium disilicate), and the other half received no surface treatment. Half the crowns from each group were luted with resin-modified glass ionomer (RMGI, RelyX Luting Plus) and half were luted with a resin cement (RelyX Unicem 2) to resin composite dies. Crowns were load cycled (100,000 cycles, 100 N force, 24°C water) and then loaded with a steel indenter until failure. A three-way ANOVA examined the effects of material, cement, and surface treatment on fracture load. Post-hoc comparisons were performed with the Tukey-Krammer method. RESULTS Fracture load was signficiantly different for materials and cements (p < 0.0001) but not surface treatments (p = 0.77). All lithium disilicate crowns luted with RMGI failed in fatigue loading cycling; 3Y-PSZ and 5Y-Z crowns luted with resin showed a higher fracture load compared with RMGI (p < 0.001). With resin cement, there was no signficant difference in fracture load between 5Y-Z and lithium disiliciate (p = 1) whereas 3Y-PSZ had a higher fracture load (p < 0.0001). CONCLUSIONS Cement type affected fracture load of crowns but surface treatment did not. The 0.8 mm uniform thick crowns tested benefited from using resin cement regardless of type of ceramic material. Crowns fabricated from 5Y-Z may be particle-abraded if luted with resin cement.

Statement of problem. The etiology (chemical, friction, abfraction) of noncarious cervical lesion (NCCL) progression is poorly understood.Purpose. The purpose of this 5-year prospective clinical trial was to measure the relationship between NCCLs and various etiologic factors.Material and methods. After review board approval, 29 participants with NCCLs were enrolled. Polyvinyl siloxane impressions were made of each NCCL, and casts were poured at baseline, 1, 2, and 5 years. The casts were scanned with a noncontact profilometer, and 1-, 2-, and 5-year scans were superimposed over baseline scans to measure volumetric change in NCCLs. T-scan and Fujifilm Prescale films were used to record relative and absolute occlusal forces on teeth with NCCLs at the 5-year recall. Participant diet, medical condition, toothbrushing, and adverse oral habit questionriaires were given at the 5-year recall. Occlusal analysis was completed on mounted casts to determine the presence of wear facets and group function. Volumetric lesion progression from 1 to 5 years was correlated to absolute and relative occlusal force using mixed model analysis. The Kruskall-Wallis and Mann-Whitney analyses compared lesion progression with diet, medical condition, toothbrushing, adverse oral habits, wear facets, and group function.Results. The NCCL progression rate over 5 years was 1.50 +/- 0.92 mm(3)/yr. The rate of progression of NCCLs was related to mean occlusal stress (P=.011) and relative occlusal force (P=.032) in maximum intercuspation position. No difference was seen in NCCL progression between participants with any other factors.Conclusion. Heavy occlusal forces play a significant role in the progression of NCCLs.

Journal of ProsthodonticsVolume 9, Issue 4 p. 248-249 Anatomy of Orofacial Structures 6th Edition Keith E. Kinderknecht DMD, Keith E. Kinderknecht DMD Associate ProfessorDirector of Postgraduate ProsthodonticsWest Virginia UniversitySchool of DentistryMorgantown, WVSearch for more papers by this author Keith E. Kinderknecht DMD, Keith E. Kinderknecht DMD Associate ProfessorDirector of Postgraduate ProsthodonticsWest Virginia UniversitySchool of DentistryMorgantown, WVSearch for more papers by this author First published: 06 August 2004 https://doi.org/10.1111/j.1532-849X.2000.246_3.xRead the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat Volume9, Issue4December 2000Pages 248-249 RelatedInformation

Conventional overdentures can be made with or without attachments, whereas implant-supported overdentures require bar or stud type attachments. Accurate placement of the attachments in the overdenture is critical for the success of the prosthesis and implants. An improved procedure is presented for stabilizing the existing denture with vinyl polysiloxane impression material during the clinical incorporation of stud attachments to the implant-supported overdenture.

The prosthodontic treatment of patients with a history of temporomandibular disorders presents unique risk‐management problems because of the varied nature, uncertain prognosis, and frequent recurrence of these disorders. Patients with temporomandibular disorders frequently require managed treatment over extended periods of time and may complicate the delivery and outcome of prosthodontic treatment. Informed consent is needed to protect both the patient and the prosthodontist because it facilitates proper communication, goal setting, and cooperation. The purpose of this article is to discuss the essential elements of informed consent and to present an informed consent program useful in the prosthodontic treatment of patients with temporomandibular disorders.

A soft tissue cast permits the technician to make fixed prostheses with optimal contours. This article describes a quick and easy procedure for making a vinylsiloxane soft tissue cast directly in the impression.