Coronal tooth structure in root-treated teeth prepared for complete and partial coverage restorations.
This in vivo study assessed the remaining coronal tooth structure in teeth prepared for complete and partial coverage restorations using 3D-scanning and a Tooth Restorability Index (TRI). The cuspal coverage preparation designs selected by 10 postgraduate dentists and 10 general dental practitioners were recorded in a questionnaire. Eighteen patients had molar root treatment completed at the Eastman Dental Hospital and were prescribed a coronal-radicular amalgam core and cast restoration. Each tooth was prepared in vivo by one operator for a cast restoration. Two clinical impressions were made to produce two dies: one of remaining coronal tooth structure before crown preparation and a second die of coronal tooth structure in vivo after crown preparation. For teeth prepared for partial coverage in vivo (n = 13), a third die was prepared in vitro representing remaining tooth structure after complete coverage preparation. The three dies were of tooth structure prior to core placement. All dies (n = 31) were scanned using a laser profilometer and the volume of remaining tooth structure calculated. Four observers scored 31 dies using the TRI. The percentage loss of coronal tooth volume following a complete instead of a partial coverage preparation varied from 3.29% to 45.23% and the mean TRI fell from 10.7 to 7.5 units. There was a strong correlation between mean TRI and scanned volume of tooth structure (P = 0.013). Over 50% of the dentists altered their initial choice of restoration design from complete to partial coverage. Complete coverage preparations removed more tooth structure than partial coverage.
Murphy
F
F
UCL Eastman Dental Institute, Eastman Dental Hospital, London, UK.
McDonald
A
A
Petrie
A
A
Palmer
G
G
Setchell
D
D
D003442:Crowns / Q000592:standards*; D017268:Dental Prosthesis Retention; D006801:Humans; D003765:Models, Dental; D011795:Surveys and Questionnaires; D019231:Tooth Preparation, Prosthodontic / Q000379:methods*