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.
|Number of pages||5|
|Journal||Journal of Esthetic and Restorative Dentistry|
|State||Published - May 1 2018|
Bibliographical noteFunding Information:
The authors do not have any financial interest in any of the companies or products used in this study. Any opinions expressed in this work represent the personal opinions of the authors and do not represent the official opinion of the United States Air Force, Uniformed Services Health Sciences University, Department of Defense, or the United States Government.
© 2018 Wiley Periodicals, Inc.
- axial wall height
ASJC Scopus subject areas
- Dentistry (all)