feldspar and Tooth-Loss

This article is part of a randomized clinical trial on different treatments in the shortened dental arch (SDA). It focused on the abutment tooth prognosis with cantilevered fixed dental prostheses (CFDPs).. Sixty-two patients with a bilaterally SDA up to the first or second premolar in the mandible or maxilla were evaluated. In 57 of 124 quadrants, second premolars were replaced by a CFDP (cantilever group). In the remaining 67 quadrants, a natural second premolar was present and thus no need for a CFDP was given (non-cantilever group). Patients were recalled annually up to 5 years.. The mean observation period was 56.3 months (min. 3.0, max. 76.2, SD 16.1). Kaplan-Meier survival rates concerning tooth loss and tooth fracture were 93.9%/94.0% in the cantilever group and 91.9%/92.8% in the non-cantilever group. Differences between both groups were not significant. The survival rate concerning loss of retention of CFDP retainers was 92.1% in the cantilever group.. After 5 years of clinical service, CFDPs for the replacement of the second premolar showed no negative impact on the abutment tooth prognosis.. Cantilevered fixed dental prostheses present a viable treatment option in the shortened dental arch without compromising the medium-term abutment tooth prognosis.

Topics: Adult; Aluminum Silicates; Bicuspid; Cuspid; Dental Abutments; Dental Arch; Dental Porcelain; Denture Design; Denture Retention; Denture, Partial, Fixed; Follow-Up Studies; Gold Alloys; Humans; Jaw, Edentulous, Partially; Mandible; Maxilla; Metal Ceramic Alloys; Potassium Compounds; Survival Rate; Tooth Fractures; Tooth Loss; Treatment Outcome

Metal ceramic restorations are widely used in prosthodontics, but long-term data on their clinical performance in private practice settings based on prospective trials are sparse.. This clinical trial was designed to provide realistic long-term survival rates for different outcomes related to tooth loss, crown loss, and metal ceramic defect.. Ninety-five participants were provided with 190 noble metal ceramic single crowns and 138 participants with 276 fixed dental prosthesis retainer crowns on vital posterior teeth. Follow-up examinations were scheduled 2 weeks after insertion, annually up to 8 years, and after 10 years. Kaplan-Meier survival analyses, Mantel-Cox logrank tests, and Cox regression analyses were conducted.. Because of variations in the time of the last examinations, the maximum observation period was 12.1 years. For the primary outcome 'loss of crown or tooth', the Kaplan-Meier survival rate was 94.3% ±1.8% (standard error) at 8.0 years (last outcome event) for single crowns and 94.4% ±1.5% at 11.0 years for fixed dental prosthesis retainer crowns. The difference between the survival functions was not significant (P>.05). For the secondary outcome 'metal ceramic defect', the survival rate was 88.8% ±3.2% at 11.0 years for single crowns and 81.7% ±3.5% at 11.0 years for fixed dental prosthesis retainer crowns. In Cox regression models, the only significant covariates for the outcome event 'metal ceramic defect' were bruxism in the medical history (single crowns) and signs and symptoms of bruxism (fixed dental prosthesis retainer crowns) with hazard ratios of 3.065 (95% CI 1.063 - 8.832) and 2.554 (95% CI 1.307 - 4.992).. Metal ceramic crowns provided in private practice settings show good longevity. Bruxism appears to indicate a risk for metal ceramic defects.

Topics: Adolescent; Adult; Aged; Aluminum Silicates; Bruxism; Crowns; Dental Porcelain; Dental Prosthesis Design; Dental Restoration Failure; Denture Retention; Denture, Partial, Fixed; Female; Follow-Up Studies; Gold Alloys; Humans; Longitudinal Studies; Male; Metal Ceramic Alloys; Middle Aged; Palladium; Platinum; Potassium Compounds; Prospective Studies; Silver; Survival Analysis; Tooth Loss; Treatment Outcome; Young Adult

Topics: Acrylic Resins; Aluminum Silicates; Bruxism; Crowns; Dental Porcelain; Dental Prosthesis Design; Dental Restoration, Temporary; Denture Design; Denture, Partial, Fixed; Esthetics, Dental; Follow-Up Studies; Gold Alloys; Humans; Male; Metal Ceramic Alloys; Middle Aged; Patient Care Planning; Potassium Compounds; Tooth Abrasion; Tooth Loss; Vertical Dimension