The Marginal Adaptation of Feldspathic Veneers Bonded with Pre-heated Composite Resin: A Randomized Clinical Trial

To evaluate the marginal adaptation of feldspathic porcelain veneers bonded with pre-heated composite resin compared to those bonded with conventional light-cured resin cement. This randomized, split-mouth, double-blind clinical trial was conducted on 4 patients, each receiving a total of 24 feldspathic porcelain veneers (Shofu, Japan) fabricated using the layering technique. On one side of the mouth, veneers were bonded with pre-heated composite resin (Tokuyama, Japan), while the contralateral side was bonded with conventional light-cured resin cement. Marginal adaptation was clinically evaluated at a single time point, six months after bonding, using a dental explorer under magnification. A standardized scoring system (ranging from 0 to 3) was used to assess the marginal fit. Both groups showed clinically acceptable marginal adaptation scores throughout the follow-up period. However, the pre-heated composite group demonstrated slightly better adaptation scores at all time points, although the differences were not statistically significant. Pre-heated composite resin may provide improved marginal adaptation for feldspathic veneers compared to light-cured resin cement. These findings support its clinical applicability as a luting agent for esthetic ceramic restorations.