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Biomedical subjects

B J Crispin

Publications and source records attributed to B J Crispin.

27 records · Page 2Linked to original sources
PubMed1981

Margin placement of esthetic veneer crowns. Part III: Attitudes of patients and dentists.

Attitudes of 396 subjects were surveyed concerning crown margin placement, and 112 dentists were surveyed regarding their treatment approach in respect to crown margin placement. The results of this study indicate that: 1. Routine subgingival margin placement of esthetic crowns may overtreat many patients. 2. Routine subgingival margin placement of esthetic crown is not always necessary. 3. Some patients may accept supragingival crown margins, even if they show. 4. A substantial group of patients may prefer optimum health potential over esthetics. 5. A thorough diagnosis should include analysis of patient's attitudes.

Attitude↗
PubMed1981

Margin placement of esthetic veneer crowns. Part II: Posterior tooth visibility.

The amount of posterior tooth visibility was analyzed in a population of 425 subjects. By scoring photographic data, the percentage of posterior teeth that could have a crown margin placed in their occlusal, middle, and gingival sections without showing were calculated. The results of this study indicate that: 1. For esthetic reasons, posterior margin placement should be handled on an individual basis. 2. The routine placement of either supragingival or subgingival margins for esthetics alone on posterior teeth may be over- or under-treating, respectively, a portion of the population. 3. A substantial percentage of the population studied had posterior gingival sections that were visible. A substantial percentage also had gingival sections that were not visible.

Bicuspid↗
PubMed1981

Margin placement of esthetic veneer crowns. Part I: Anterior tooth visibility.

The visibility of anterior teeth was studied in a population of 425 subjects. Scoring photographic data gave the percentages of anterior teeth that would not show a crown margin if it were placed in incisal, middle, or gingival sections. The results of this study indicate: their anterior teeth which would not show unless the lips were retracted.

Crowns↗
PubMed1979

Conservative alternative to full esthetic crowns.

Several alternatives to full esthetic crowns have been presented. Preparation techniques and factors to be used in patient selection have been discussed for using all-metal esthetic retainers. Problems that arise from the indiscriminate use of full-coverage crowns must not be overlooked. Adjunctive esthetic retainers such as pinledges, three-quarter crowns, and inlays can be used to provide a functional, conservative alternative to full crowns while maintaining maximum esthetics.

Crowns↗
PubMed1979

Tissue response to posterior denture base-type pontics.

Several factors have been presented that must be evaluated when selecting an appropriate posterior pontic design. Because of the controversy that exists with regard to using posterior denture base pontics, a long-span fixed partial denture was followed for 14 months. Results indicate that tissue health can be maintained, while tissue proliferation is inevitable. There is no one posterior pontic design that can be used to satisfy all requirements. Optimal pontic design can be accomplished only if each situation is evaluated on an individual basis and an appropriate design selected. Further controlled longitudinal clinical research of pontic design is mandatory for expansion of the ability to predict optimal prognosis.

Adult↗
PubMed1979

Color stability of temporary restorative materials.

In this study it was shown that: 1. There was a statistically significant initial color difference in materials labeled shade 65. 2. Rough materials darkened significantly more than polished materials. 3. There was not statistically significant over all difference in the amount of staining between air-cured and pressure-cured samples. 4. The methyl methacrylates materials demonstrated that least darkening, followed closely by the ethyl-methyl methacrylate material. The vinyl-ethyl methacrylate material darkened consistently more in 14 and 30 days and significantly more at 60 days. The epimine material was consistently the least color stable and showed a significantly greater amount of darkening.

Absorption↗
PubMed1978

Effects of occlusal therapy on pantographic reproducibility of mandibular border movements.

A clinical experiment was undertaken to study the relationship between occlusal therapy and pantographic reproducibility. Twenty-six subjects were categorized according to their ability to reproduce pantographic border movements and were put into either a control nonreproducible, control reproducible, or experimental nonreproducible group. From each subject a sequence of five pantographic surveys consisting of two morning and two afternoon pantographic recordings was taken. Each survey period lasted a minimum of 30 days. The experimental subjects alone were given occlusal splint therapy and occlusal adjustment therapy during the sequence of recall periods. The relationship between the effect caused by occlusal therapy and pantographic reproducibility was analyzed. For the purpose of analysis, the pantographic recordings were assessed a numerical score using a pantographic reproducibility index. A double-blind technique was used until all data were collected.

Adult↗