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At least 811 records · Page 45Linked to original sources
PubMed1997

The split-post lock: an alternative lock for hinge clasps and swing-lock removable partial dentures.

When the locking component of a prosthesis loses its effectiveness, the solution has been to replace the component. This article describes a procedure for the production of a split-post lock. This lock can be used as an alternative in the construction of custom-made hinge clasps or for swing-lock dentures. If a loss or reduction in lock strength occurs through wear of components, then this split-post lock can be reactivated. A procedure in which this lock can be used to replace a worn swing-lock latch is also described.

Dental Clasps↗
PubMed2003

On the accuracy of some in vitro models for mechanical studies of maxillary removable partial dentures.

OBJECTIVES: Comparative in vitro/in vivo studies show wide differences in functional strain magnitudes and patterns of functional strain distribution in prosthetic devices. The aim of this study was to evaluate the accuracy of three in vitro models for biomechanical studies of prosthetic devices. METHODS: Strain gages were attached to the test RPDs of six subjects. In vitro maxillary models with simple (model A), intermediate (model B) and advanced (model C) features for the anatomical simulation of supporting structures were manufactured for each subject. The dentures were subjected to two separate series of standardized functional and laboratorial loading tests. The principal maximum strain value (epsilon (1)) obtained for each gage and experiment was used to calculate the intra-experiment variance and inter-experiment variance for the in vivo and in vitro experiments. The integrated strain gage difference value between the in vitro and in vivo data (Sigma(diff)) was calculated for every loading test and compared to the in vivo inter-experiment variance with ANOVA and Scheffés test. RESULTS: The bite forces recorded were similar for each subject and loading position and between the two loading sessions. The inter- and intra-experiment variance was found to be higher for in vivo loadings than for in vitro. Results showed that the (Sigma(diff)) values for model B and model C were significantly different from the in vivo strain inter-experiment variance (p<0.05). SIGNIFICANCE: This study showed that the anatomical simulation of in vitro models is insufficient to allow for accurate mechanical analyses of maxillary RPDs and that only simple verifications of the strain levels in prosthetic appliances can be attained in vitro.

Aged↗
PubMed2000

Direct tissue stops for distal extension removable partial dentures.

Supplemental impression++ strategies may be used to capture optimal registration of residual ridge tissues in distal extension-base RPDs. A procedure is described to adapt tissue stops in vivo and positively position the framework to the master cast when clinically using corrected impressions. This method is simple and cost-effective, and it promotes accurate prosthetic-tissue relationships during clinical and laboratory phase of RPD fabrication.

Dental Abutments↗
PubMed1995

The use of ceramic orthodontic brackets as rest seats for removable partial dentures.

Ceramic orthodontic brackets were developed for the purpose of esthetics and increased tooth-to-bracket strength. An alternative method of preparing a rest seat on the lingual surface of lower canine teeth without violating the enamel integrity is offered. Ceramic orthodontic brackets were bonded to the lingual surfaces of mandibular canines and shaped into rest seats using diamond burs. Because the rest seats are not cut into the tooth structure, sensitivity and potential caries complications are avoided. The bracket is adhered to the tooth surface with a dimethacrylate bonding material. The brackets are bonded with either a no-mix or a two-part adhesive system. The strength of this bond will easily support the forces of a partial denture framework. The advantage over metal acid-etched retained rests is that this method avoids a time-consuming laboratory step. The greatest advantage over the use of composite resins that are shaped into rest seats is the much higher bond strength. After ceramic brackets were bonded to the lingual surfaces of mandibular canines and shaped into rest seats, an impression was obtained for the fabrication of a conventional partial denture framework.

Ceramics↗