Fracture resistance of CAD-CAM all-ceramic surveyed crowns with different occlusal rest seat designs

Saurabh Chaturvedi; Turki Alqahtani; Saleh Alsolami; Abdulbari Alqahtani; Gotam Das; Ebrahim Alsubaiy

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저자정보: Saurabh Chaturvedi (Department of Prosthetic Dentistry King Khalid University Abha Saudi Arabia) Turki Alqahtani (Department of Prosthetic Dentistry King Khalid University Abha Saudi Arabia) Saleh Alsolami (Department of Prosthetic Dentistry King Khalid University Abha Saudi Arabia) Abdulbari Alqahtani (Department of Prosthetic Dentistry King Khalid University Abha Saudi Arabia) Gotam Das (Department of Prosthetic Dentistry King Khalid University Abha Saudi Arabia) Ebrahim Alsubaiy (Department of Prosthetic Dentistry King Khalid University Abha Saudi Arabia)

저널정보: 대한치과보철학회 The Journal of Advanced of Prosthodontics The Journal of Advanced of Prosthodontics 제13권 제1호

발행연도: 2021.1

수록면: 36 - 45 (10page)

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Purpose. To investigate the fracture resistance of monolithic CAD-CAM allceramic surveyed crowns with two different occlusal rest seat designs. Materials and Methods. Two maxillary first premolar were prepared for all-ceramic surveyed crowns with wide (2/3rd of buccolingual width of an unprepared tooth) or narrow (1/3rd of buccolingual width of an unprepared tooth) disto-occlusal rest seat (ORS) designs. Eighty monolithic CAD-CAM all-ceramic surveyed crowns were prepared and divided into 4 groups - Group CR, Composite resin material as a control; Group LDS, Lithium disilicate based material; Group ZIPS, zirconiamaterial (IPS ZirCAD); and Group ZLHT, zirconia- material (CeramillZolidht+). Crowns were cemented on an epoxy resin die with adhesive resin cement. The fracture resistance of crowns was tested with the universal machine. Univariate regression analysis was used. Results. The mean ± standard deviation of maximum failure force values varied from 3476.10 ± 285.97 N for the narrow ORS subgroup of group ZIPS to 687.89 ± 167.63 N for the wide ORS subgroup of group CR. The mean ± standard deviation of maximum force was 1075 ± 77.0 N for group CR, 1309.3 ± 283.9 N for group LDS, 3476.1 ± 285.97 N for group ZIPS, and 2666.7 ± 228.21 N for group ZLHT, with narrow occlusal rest seat design. The results of the intergroup comparison showed significant differences in fracture strength with various material groups and occlusal rest seat designs (P <.001). Conclusion. The zirconia-based all-ceramic surveyed crowns fractured at more than double the load of Lithium disilicate based crowns. The crowns with narrow base occlusal rest seat design had statistically significantly higher fracture resistance than surveyed crowns with wide occlusal rest seat design. The use of narrow occlusal rest seat design in CAD-CAM all ceramic surveyed crowns provides higher fracture resistance, and therefore narrow occlusal rest design can be used for providing esthetics with high strength.

#CAD-CAM #Digital dentistry #Prosthodontics #Removable prosthodontics

참고문헌 (37)

참고문헌 신청

Freire Y / 2019 / The marginal fit of CAD/CAM monolithic ceramic and metal-ceramic crowns / J Prosthodont 28:299~304

Rodríguez V / 2016 / Fracture load before and after veneering zirconia posterior fixed dental prostheses / J Prosthodont 25:550~556

Pelaez J / 2012 / A four-year prospective clinical evaluation of zirconia and metal-ceramic posterior fixed dental prostheses / Int J Prosthodont 25:451~458

Martínez-Rus F / 2011 / Evaluation of the absolute marginal discrepancy of zirconia-based ceramic copings / J Prosthet Dent 105:108~114

Shareen H Elshiyab / 2018 / Fracture resistance of implantsupported monolithic crowns cemented to zirconia hybridabutments: zirconia-based crowns vs. lithium disilicate crowns / The Journal of Advanced of Prosthodontics 10(1):65~72

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