Factors for Successful Crowns

This study examines patient, dentist, and laboratory factors associated with the fabrication of successful crowns. The study is conducted in two stages. The first stage was a questionnaire that documented current practices among clinicians making crowns, such as material choices and impression techniques. A subset of dentists from the first stage were enrolled in the second stage, which is a clinical study that analyzes dentist and clinical variables to find predictors for crown success. Data from dental laboratories will also be collected in stage 2 to determine the prevalence of acceptable impressions, crown preparations and jaw relation records sent to labs for crown fabrication.

Stage 1 Full questionnaire

Clinical portion (stage 2) of the study involved the following forms:

Enrollment/Baseline: consecutive eligible patient log; patient characteristics form; crown preparation form; and laboratory checklist

Final Study Visit: crown insertion form

The laboratory completes the laboratory questionnaire to evaluate techinical aspects of the impression and preparation

If a patient will no longer participate in the study, a discontinuation form is completed

Supplemental table A1 includes the distribution of respondents' likelihood of recommending a single-unit crown based on four scenarios in Figure 1 of the main manuscript, by dentist and practice characteristics.

Appendix Table 1A includes the distribution of the responses to accept or reject an impression 

Abstracts of study results presented at the American Association for Dental Research

Network enrollment questionnaire

Appendix Table 3 includes the association of practitioner and practice characteristics with agreement on the practitioners' top three treatment recommendations