PubMed · 6761750
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Y Samama, A Vassallo, A Chan Thu. [Thimbles crowns].. https://pubmed.ncbi.nlm.nih.gov/6761750/
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OBJECTIVE: To determine the quality of impressions for crown and bridge work made in general dental practice. DESIGN AND SETTING: All impressions for crown and bridge work which had been sent to four commercial dental laboratories in the UK were assessed by two examiners, each laboratory being visited on two occasions. MATERIALS AND METHODS: 290 cases which had been received by the laboratories on the days of the visits were assessed for a number of factors related to quality. There was no selection or rejection--all impressions received were examined. RESULTS: Flexible plastic trays were used for the majority of working impressions for crown and bridge work in general dental practice (72%), many had been re-used (> 13%), defects in the recording of the prepared teeth were common, and cross infection control was not routine. CONCLUSIONS: Quality standards for impressions for crown and bridge work in general dental practice in the UK are a cause for concern if the sample of cases seen in this study is typical.
STATEMENT OF PROBLEM: Traditional veneer preparation has come to represent an almost universally accepted guideline of veneer preparation. It calls for an interproximal finish line at or just into the contact point. However, in certain situations, such an approach can have functional and esthetic limitations. PURPOSE: This article reviews those functional and esthetic limitations and discusses an alternative technique, the full veneer preparation. The advantages and disadvantages of this approach are discussed in relation to veneer cases with malaligned teeth, diastema, discoloration, black spaces, restorations, and/or veneers next to crowns.