Journal of Prosthodontics News
January 6, 2020
Assessment of the Quality of Single‐Unit Crown Preparations and Impressions
Now online in the Journal of Prosthodontics, Drs. Michael S. McCracken, Mark S. Litaker, Alexandra E. S. Thomson, Alan Slootsky, Gregg H. Gilbert, and the National Dental PBRN Collaborative Group assessed quality of single-unit crown preparations and impressions.
Dentists in the National Dental Practice‐Based Research Network enrolled patients in the study and laboratory technicians evaluated the quality of the tooth preparations and impressions. The primary outcome for each crown was clinical acceptability (CAC). A secondary outcome was “Goodness of Fit (GOF)”, a composite score of several aspects of clinical fit.
In 92% of cases, technicians ranked the marginal detail of impressions as good or excellent; other aspects of the impression were ranked good or excellent 88% of the time.
Factors associated with higher CAC were more preparation taper and use of optical imaging. Factors associated with better GOF were higher impression quality, greater occlusal reduction, more preparation taper, and optical imaging.
McCracken, MS, Litaker, MS, Thomson, AES, et al (2020). Laboratory Technician Assessment of the Quality of Single‐Unit Crown Preparations and Impressions as Predictors of the Clinical Acceptability of Crowns as Determined by the Treating Dentist: Findings from The National Dental Practice‐Based Research Network. J Prosthodont. doi:10.1111/jopr.13137
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