Relationship Between Internal Accuracy and Load-Bearing Capacity of Minimally Invasive Lithium Disilicate Occlusal Veneers

Nina Mörikofer, Med Dent/Goran I. Benic, PD Dr Dent/Ji-Man Park, DDS, MSD, PhD/Mutlu Özcan, Prof Dent, PhD/Jürg Hüsler, Em Phil Nat/Alexis Ioannidis, Dent: Purpose: To test whether internal accuracy affects the load-bearing capacity of 0.5-mm–thick occlusal veneers made out milled or heat-pressed lithium disilicate (LS2). Materials and Methods: Extracted human molars (N = 80) were divided into four groups (n 20 each) depending on bonding substrate (enamel [E] dentin [D]) fabrication method (milling [CAD] heat pressing [PRE]) for LS2 veneers: (1) E-CAD; (2) D-CAD; (3) E-PRE; (4) D-PRE. After restoration fabrication, abutment teeth corresponding restorations scanned superimposed in order to measure marginal accuracy. adhesive cementation, specimens thermomechanically aged thereafter loaded until fracture. The capacities (Fmax) measured. Fmax between compared using Kruskal-Wallis (P < .05) pairwise group comparisons. In addition, relationship was analyzed Spearman rank correlation. Results: Median values (and first third quartiles) per as follows: 1,495 N (Q1: 932, Q3: 2,318) 1,575 1,314, 1,668) 1,856 1,555, 2,013) 1,877 1,566, 2,131) No statistical difference found .0981). Overall, areas cusp .0007) fossae .0001) showed significant differences. While no differences detected area .3518), a correlation with negative linear 3D .0007). Conclusion: An increase raised minimally invasive veneers. general, bonded regions better those enamel.