Fracture Resistance and Retention of CAD/CAM Endo-Crowns Using Different Preparation Designs
Elsaid, S., Ahmed, A., Hassan, S. (2641). Fracture Resistance and Retention of CAD/CAM Endo-Crowns Using Different Preparation Designs. EKB Journal Management System, 2020(4), -. doi: 10.21608/adjg.2020.13052.1147
Shahenda Elsaid; Atef Ahmed; Suad Hassan. "Fracture Resistance and Retention of CAD/CAM Endo-Crowns Using Different Preparation Designs". EKB Journal Management System, 2020, 4, 2641, -. doi: 10.21608/adjg.2020.13052.1147
Elsaid, S., Ahmed, A., Hassan, S. (2641). 'Fracture Resistance and Retention of CAD/CAM Endo-Crowns Using Different Preparation Designs', EKB Journal Management System, 2020(4), pp. -. doi: 10.21608/adjg.2020.13052.1147
Elsaid, S., Ahmed, A., Hassan, S. Fracture Resistance and Retention of CAD/CAM Endo-Crowns Using Different Preparation Designs. EKB Journal Management System, 2641; 2020(4): -. doi: 10.21608/adjg.2020.13052.1147

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

Al-Azhar Journal of Dentistry
Volume 2020, Issue 4, April 2020  XML
DOI: 10.21608/adjg.2020.13052.1147
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Authors
Shahenda Elsaid1; Atef Ahmed2; Suad Hassan3
1Demonstrator of Fixed Prosthodontic, Faculty Of Dental Medicine, Horus University, Egypt
2Professor and Chairman of Crowns and Bridges Faculty of Dental Medicine for Girls, Al-Azhar University, Cairo, Egypt
3Lecturer 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
Endocrown; Fracture resistance; retention; ferrule
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