Effect of Preparation Design on the Fracture Strength of Partial Veneers in Maxillary Bicuspids
Project no. 32244 · Status: Kapanmış (Yayın bekleniyor) · 2024
Summary
<p>Increasing aesthetic expectations have led to a rise in minimally invasive treatments like partial laminate veneers. While these restorations succeed in anterior, their use in posterior teeth, which are part of the smile but are exposed to higher occlusal loads, remains questionable. Current study evaluates the influence of the preparation design on the fracture strength of maxillary bicuspids restored with partial laminate veneers. Fifty sound bicuspids were divided into five groups of 10 specimens each: Group 1 (non-prepared), Group 2 (1 mm occlusal overlap), Group 3 (occlusal overlap extending to the middle of the buccal cusp tip and central groove), Group 4 (occlusal overlap extending to the central groove) and Group 5 (occlusal overlap extending to the middle of the central groove and palatal cusp tip). Prepared specimens were scaned, veneers were designed digitally and were fabricated with lithium disilicate glass-ceramic and cemented with light-cure resin cement. The specimens were then thermally cycled, loaded to fracture, and statistically analyzed for strength and failure modes. Mean fracture strength values were found as 647.07, 424.59, 425.37, 346.88, and 444.85Ns for Groups 1, 2, 3, 4 and 5 respectively. Significant differences in fracture strength were observed between the test and the control groups (p<0.05) but not among the test groups. (p>0.05) Additionally, no significant effect of preparation designs on failure types was observed. Lithium disilicate partial veneers in bicuspids demonstrated lower fracture strength than intact teeth, irrespective of preparation design. When required, preparation design can be planned according to conservative considerations in bicuspids.</p>