Fracture Resistance and Retention of CAD/CAM Endo-Crowns Using Different Preparation Designs | ||||
Al-Azhar Dental Journal for Girls | ||||
Article 7, Volume 7, 2-C, April 2020, Page 203-211 PDF (982.31 K) | ||||
Document Type: Original Article | ||||
DOI: 10.21608/adjg.2020.13052.1147 | ||||
View on SCiNiTO | ||||
Authors | ||||
Shahenda T. Elsaid 1; Atef F. Ahmed2; Suad M. 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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