Effect of fabrication process on the bond strength between silicone elastomer and acrylic resin for maxillofacial prosthesis

Abstract

This study evaluated the effects of the fabrication process on tensile bond strength between maxillofacial silicone elastomer and acrylic resin. A common maxillofacial silicone elastomer (VST-50), two primers (Sofreliner primer and R-SI-LINE Plasticbond), and two acrylic resins (Unifast III and Palapress Vario) were selected. Silicone elastomer between primed acrylic resin plates were polymerized using a metal flask mold or a flaskless stone mold. Bond strength of the specimens was measured by a tensile test and analyzed using two-way analysis of variance (ANOVA) with Tukey's honest significant difference test. All fracture surfaces showed interfacial fracture. Both the fabrication process and the primer-acrylic resin combination affected bond strength, and two-way ANOVA indicated a significant interaction. Bond strength was generally greater when silicone elastomer was polymerized using a flaskless stone mold.

Effect of plasma treatment on the peel bond strength between maxillofacial silicones and resins

“…Considerable forces are applied by a patient that can detach a prosthesis from the implants; this action can commonly lead to failure of the bonding interface. Therefore, studies focused on enhancing the bond between silicone and substructure are needed 3,4,6,7,[10][11][12] . In this context, these studies should consider the type of adhesive primer, silicone elastomer, substructure material, and surface properties of the bonding interface.…”

“…Strength and durability of the bond between the silicone elastomer and resin can be influenced by several factors, including composition of silicone elastomer, substructure material, adhesive primer used, and bonding interface surface properties [3][4][5][6][10][11][12] . Most of these studies have focused on adhesive primers, which provide an increase in bond strength between two different chemical structure silicone elastomers and resin bases 5,6,[11][12][13] . However, the effects of surface topography and characteristics of bonding interface of resin and silicone have undergone limited investigation in this area 4,14,15) .…”