Biomechanical behavior of endodontically treated premolars using different preparation designs and CAD/CAM materials. (April 2017)

• Record Type: Journal Article
• Authors: Pedrollo Lise, Diogo; Van Ende, Annelies; De Munck, Jan; Umeda Suzuki, Thaís Yumi; Cardoso Vieira, Luiz Clovis; Van Meerbeek, Bart
• Is Part Of: Journal of dentistry. Volume 59(2017:Apr.)
• Page Start: 54
• Page End: 61
• Publication Date: 2017-04
• Subjects: Lithium disilicate -- Composite -- Compressive load -- CAD/CAM -- Endocrown -- Cyclic aging; Dentistry -- Periodicals; Dentistry -- Periodicals; Dentisterie -- Périodiques; Electronic journals; 617.6005
• DOI: 10.1016/j.jdent.2017.02.007
• Languages: English
• ISSNs: 0300-5712

Abstract

Abstract: Objectives: To evaluate the effect of restoration design ('2.5-mm deep endocrown', '5-mm deep endocrown' or '5-mm deep post&crown') and CAD/CAM material type (composite or lithium disilicate glass-ceramic) on the load-to-failure of endodontically treated premolars in absence of any ferrule. Methods: The crowns of 48 single-rooted premolars were cut and the roots were endodontically treated. Teeth were randomly divided into six groups (n = 8); teeth in each group were restored using one of the two tested materials with standardized CAD/CAM fabricated endocrowns (with either 2.5-mm or 5-mm deep intra-radicular extension) or conventional crowns (5-mm deep post&crown). After cementation using luting composite, the specimens were immersed in distilled water and subjected to 1, 200, 000 chewing cycles with a load of 50 N applied parallel to the long axis of the tooth (0°). After cyclic loading, a compressive load was applied at 45° to the tooth's long axis using a universal testing machine until failure. Load-to-failure was recorded (N) and the specimens were examined under a stereomicroscope with 3.5x magnification to determine the mode of failure. Results: All specimens survived the 1, 200, 000 chewing cycles. A significant interaction between restoration design and CAD/CAM material was found using two-way ANOVA. In the '2.5-mm deep endocrown' groups, the composite achieved a significantly higher load-to-failure than the lithium disilicate glass-ceramic, while no differences between materials were found in the '5-mm deep endocrown' and '5-mm deep post&crown' groups. More unfavorable failures (root fractures) were observed for higher load-to-failure values. Conclusions: Only following a '2.5-mm deep endocrown' design, composite appeared more favorable than lithium disilicate glass-ceramic as crown material; this may be explained by their difference in elastic modulus. Clinical significance: Shallow endocrown preparations on premolars present less surface for adhesive luting and a difference in crown material becomes apparent in terms of load-to-failure. The use of a more flexible composite crown material appeared then a better option.