Effect of Mechanical Modification of Acrylic Resin Denture Teeth Bonded to Acrylic Denture Base

Techniques for bonding denture teeth to acrylic resin denture base remains empirical, with little consensus from the literature, among clinicians or among dental laboratories. Despite of this great variation, the data available regarding effectiveness of various methods used are sparse. The study was carried out to compare the effect of different surface treatments of ridge lap area of acrylic resin denture teeth on bond strength of acrylic resin denture teeth with acrylic resin denture base. 180 Maxillary central incisors were divided into 6 groups of 30 each according to surface preparations. First group served as the control with no surface preparation; other groups included horizontal grooves, vertical grooves, diatorics, sand blasting and roughened surfaces. Compressive shear force was applied to incisal edge of each tooth until fracture occurred, the force recorded and teeth visually inspected to determine adhesive or cohesive failure. Significant increase in failure load ranged for diatoric 274±78N. Significant decrease in failure mode was observed after sand blasting 157±79N. Remaining groups showed non-significant increase in force required for bond failure.