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Research ArticlePredoctoral Dental Education

Convergence Angle of Preparations for Lithium Disilicate Glass-Ceramic Crowns by Dental Students and Its Effect on Crown Retention

Ahmed Aziz and Omar El-Mowafy
Journal of Dental Education November 2019, JDE.019.173; DOI: https://doi.org/10.21815/JDE.019.173
Ahmed Aziz
Ahmed Aziz, BDS, MSD, PhD, is Instructor, Department of Restorative Dentistry, Faculty of Dentistry, University of Toronto; and Omar El-Mowafy, BDS, PhD, FADM, is Professor, Department of Restorative Dentistry, Faculty of Dentistry, University of Toronto.
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  • For correspondence: ahmed.aziz6181@gmail.com
Omar El-Mowafy
Ahmed Aziz, BDS, MSD, PhD, is Instructor, Department of Restorative Dentistry, Faculty of Dentistry, University of Toronto; and Omar El-Mowafy, BDS, PhD, FADM, is Professor, Department of Restorative Dentistry, Faculty of Dentistry, University of Toronto.
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Abstract

The aims of this study were to determine the convergence angles of posterior teeth prepared by dental students at the University of Toronto for lithium disilicate glass-ceramic (LDGC) CAD/CAM crowns and to investigate their effect on loss of retention rate. A total of 280 preparations for posterior monolithic LDGC CAD/CAM crowns were performed on 270 patients (169 women and 101 men). Crowns were cemented with RelyX Unicem and Calibra Universal resin cements. Mesial, distal, and angle of convergence were measured on the bitewing radiographs. Cemented crowns were followed for up to six years. Data were analyzed for tooth type and location and for operator experience. The results showed the majority of convergence angles were greater than the recommended guidelines but fell within a clinically acceptable range (20 to 24 degrees). However, angles of convergence for mandibular molar preparations were highest (28.06±5.50 degrees), while maxillary premolars exhibited the lowest values (24.72±6.59 degrees). No significant difference was found between the results of dental students and foreign-trained dentists. Over a six-year observation period, only two crowns lost retention. The findings of this study indicated that ideal taper angles were impractical and difficult to achieve in clinical education settings.

Keywords
  • dental education
  • prosthodontics
  • tooth preparation
  • dental crowns
  • CAD/CAM

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Journal of Dental Education: 83 (12)
Journal of Dental Education
Vol. 83, Issue 12
1 Dec 2019
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Convergence Angle of Preparations for Lithium Disilicate Glass-Ceramic Crowns by Dental Students and Its Effect on Crown Retention
Ahmed Aziz, Omar El-Mowafy
Journal of Dental Education Nov 2019, JDE.019.173; DOI: 10.21815/JDE.019.173

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Convergence Angle of Preparations for Lithium Disilicate Glass-Ceramic Crowns by Dental Students and Its Effect on Crown Retention
Ahmed Aziz, Omar El-Mowafy
Journal of Dental Education Nov 2019, JDE.019.173; DOI: 10.21815/JDE.019.173
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  • Examining the Preferred Learning Styles of U.S. Dental Students with Learning Disabilities
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Keywords

  • dental education
  • prosthodontics
  • tooth preparation
  • dental crowns
  • CAD/CAM

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