Abstract
Statement of problem
Determining the retention and resistance of a tooth preparation for a complete crown
has only existed in theory, and these theories have never been measured on tooth preparations
performed in vivo.
Purpose
The purpose of this study was to measure the theoretical retention and resistance
of clinically produced complete crown preparations by using an objective measuring
method.
Material and methods
Stone dies from 236 complete crown preparations were collected from dental laboratories.
The dies were scanned and analyzed with the coordinate geometry method. Cross-sectional
images were captured, and the surface area was measured with a cone frustum and right
truncated pyramid formula. Two different theories of resistance form, the “on” or
“off” theory (limiting taper) and the linear model (resistance length), were calculated
for premolar and molar preparations.
Results
The mean surface areas ranged from 33.97 mm2 to 105.44 mm2 for the cone frustum formula and 41.75 mm2 to 117.50 mm2 for the right truncated pyramid formula. The facial side of maxillary premolars exhibited
the highest percentage of resistance form with the limiting taper, at 58%, and the
mesial side of the mandibular molars exhibited the lowest percentage of resistance
form, at 6%.
Conclusions
The objective method used in this study provides a way for retention and resistance
theories to be tested and for further clinical implications to be investigated.
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Article info
Publication history
Published online: April 06, 2015
Identification
Copyright
© 2015 Editorial Council for the Journal of Prosthetic Dentistry. Published by Elsevier Inc. All rights reserved.
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- Reporting numeric values of complete crowns. Part 1: Clinical preparation parametersJournal of Prosthetic DentistryVol. 114Issue 1
