Fracture Resistance and Retention of CAD/CAM Endo-Crowns Using Different Preparation Designs | ||
| Al-Azhar Journal of Dentistry | ||
| Volume 7, Issue 2, April 2020, Pages 203-211 PDF (842.45 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/adjg.2020.13052.1147 | ||
| 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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