Fracture Resistance and Retention of CAD/CAM Endo-Crowns Using Different Preparation Designs

Document Type : Original Article

Authors

1 Demonstrator of Fixed Prosthodontic, Faculty Of Dental Medicine, Horus University, Egypt

2 Professor and Chairman of Crowns and Bridges Faculty of Dental Medicine for Girls, Al-Azhar University, Cairo, Egypt

3 Lecturer of Crowns and Bridges Faculty of Dental Medicine for Girls, Al-Azhar University, Cairo, Egypt

Abstract

Purpose: to study the influence of different preparation designs on fracture resistance and retention of CAD/CAM endocrowns. Materials and methods: Forty human mandibular molars were selected to conduct the present study. All teeth were randomly divided into 2 groups (n=20 each) according to the preparation design of endocrown, Group (1): Endodontically treated teeth without ferrule (butt joint). Group (2): Endodontically treated teeth with 1mm ferrule. All prepared teeth were restored using IPS e-max CAD endocrowns. After cementation of endocrowns all specimens were subjected to thermal cycling in automated thermocycling machine in order to mimic the intra-oral condition. Then retention was measured using material testing machine, also fracture resistance was measured using material testing machine. The recorded data were collected, tabulated and statistically analyzed. Results: Endodontically treated molar with 1mm ferrule showed high fracture resistance and retention than endodontically treated molar without ferrule. Conclusions: All obtained fracture resistance and retention values lie within the clinically accepted ranges, endocrowns with 1mm ferrule have fracture resistance and retention higher than endocrowns without ferrule (butt joint).

Keywords

Main Subjects

Al-Azhar Dental Journal for Girls
Volume 7, 2-C
April 2020
Pages 203-211

Files

Share

How to cite

Statistics