Failure load effect of molar axial wall height with CAD/CAM ceramic crowns with moderate occlusal convergence
| Autor: | Michael Wajdowicz, Sara Cushen, John Brewster, Howard W. Roberts, Nicholas DuVall, Wyeth Hoopes |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Molar
Dental Stress Analysis Ceramics Materials science All ceramic 02 engineering and technology 03 medical and health sciences 0302 clinical medicine Materials Testing Ceramic Dental Restoration Failure General Dentistry Orthodontics Universal testing machine Crowns Fatigue testing Luting agent 030206 dentistry 021001 nanoscience & nanotechnology Dental Porcelain Dental Prosthesis Design Surface preparation visual_art visual_art.visual_art_medium Computer-Aided Design Adhesive 0210 nano-technology |
| Zdroj: | Journal of esthetic and restorative dentistry : official publication of the American Academy of Esthetic Dentistry ... [et al.]. 30(3) |
| ISSN: | 1708-8240 |
| Popis: | Objectives To evaluate the significance of axial wall height (AWH) in molar fracture resistance involving CAD/CAM adhesively bonded, all-ceramic full coverage restorations on preparations with moderate total occlusal convergence (TOC) (16°). Materials and Methods 60 newly extracted maxillary third molars were divided into 5 groups (n = 12). Specimens were prepared for full-coverage, all ceramic restorations with occlusal cervical AWHs of 4, 3, 2, 1 as well as a flat preparation (0 mm AWH) with all preparations with AWH containing a moderate 16° TOC. Scanned preparations were fitted with a lithium disilicate restoration with a self-adhesive resin luting agent after intaglio surface preparation with hydrofluoric acid and silanation. Specimens were stored at 37°C/98% humidity for 24 hours and tested to failure at a 45° angle applied to the palatal cusp on a universal testing machine. Mean results were analyzed using ANOVA/Tukey's (P = .05). Results Preparations containing 2, 3, and 4 millimeters of AWH demonstrated similar and higher resistance to fracture than the 1 and zero millimeter AWH groups. Conclusions Under the conditions of this study, results suggest that adhesive CAD/CAM technology may compensate for reduced axial wall height. However, more definitive results depend on fatigue testing. Clinical Significance These in vitro results suggest that adhesive CAD/CAM technology may compensate for less than optimal AWH. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Plný text