European Journal of Prosthodontics and Restorative Dentistry

cover art

Cover Date:
March 2019
Print ISSN:
0965-7452
Electronic ISSN:
2396-8893
Vol:
27
Issue:
1

Adequately Prepared? A Study Using an Innovative Computer Application to Measure Clinical Crown Convergence Angles Achieved by Students at a UK Dental School

doi: 10.1922/EJPRD_01832Strain07

This study examined the total occlusal convergence angles created for full coverage crown
preparations by students at a UK dental school. Working casts of 82 clinical crown preparations were scanned using a 3D scanner. Stereolithographic files were uploaded to Preppr, a
crown preparation analysis application. Mean bucco-lingual convergence angle were 19.6°
(+/-11.7) and mesial-distally 17.8° (+/-11.1). Smallest bucco-lingual convergence angles were
achieved for canine teeth with the largest on molar teeth. The smallest mesio-distal values
were on canine teeth with the largest on molar teeth. Ideal total convergence angles (4-14°)
were achieved in 23% of bucco-lingual preparations and 33% of mesio-distal preparation. Results for clinically acceptable angles (10-20°) were 30% and 40% respectively. There were
no statistically significant differences between tooth types for mean bucco-lingual values.
(p=0.623), mesio-distal mean values were statistically different by tooth type (p=0.003).
Mean values for mandibular molars were significantly higher than for maxillary incisors
(p=0.001) and mandibular molars had significantly higher values than maxillary canines
(p=0.045). Results in this study were comparable to those of other students and qualified
clinicians, with a minority of preparation achieving ideal values.


Keywords
Convergence Angle
Dental Student
Crown


Copyright ©2019 by Dennis Barber Ltd. All rights reserved.

Article Price
£15.00
Institution Article Price
£
Page Start
32
Page End
38
Authors
Kenneth James Strain, Janine Tiu, James Mackie, Stephen J Bonsor, Richard J Ibbetson

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  1. Evaluation of Monomer Leaching from a Resin Cement Through Dentin
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  1. Clinical Performance of Nanofilled and Microhybrid Direct Composite Restorations on Endodontically Treated Teeth
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