Effect of Different Surface Modifications of Acrylic Teeth and Thermocycling on Shear Bond Strength to Polycarbonate Denture Base Material

Abstract

During prosthodontic clinical practice, the most commonly reported type of failure is the debonding of teeth to the denture base. Incompatible surface conditions at the tooth/denture base interface result in a lack of bonding. This study aimed to study the influence of different surface modifications of acrylic teeth and thermocycling on shear bond strength to polycarbonate denture base material. Eighty cylinder-shaped samples were fabricated. The tested samples were divided into 4 groups (n = 20). Group A represents the control group, group B represents the mechanical modification of the tooth, while group C and group D represent the chemical treatment of the tooth with ethyl acetate and bonding agent, respectively. Each group was further subdivided into 2 categories depending on the thermocycling procedure (N = 10). All samples were tested for shear bond strength tests. A computer-controlled universal testing machine performed the shear bond test at a 0.5 mm/min crosshead speed. Three-way ANOVA ( P = 0.05 ) was used for the statistical analysis of the data. Results show that shear bond strength was significantly affected by the surface treatment, whether it is mechanical or chemical ( P ≤ 0.01 ) (B > D > C) compared with a control group (A). However, thermocycling has a nonsignificant decrease in the bond strength values in all experimental groups ( P > 0.05 ) (B > D > C > A). The mechanical treatment by creating retentive holes (B) provides better results than the chemical surface treatment with a bonding agent and ethyl acetate (D and C, respectively). This study concluded that various surface conditioning methods affect the bonding strength of acrylic teeth and polycarbonate denture base material with no effect of thermocycling.

Application of Mesoporous Carbon-Based Highly Dispersed K–O2 Strong Lewis Base in the Efficient Catalysis of Methanol and Ethylene Carbonate

“…For instance, DMC is used as a pharmaceutical intermediate in the production of antibiotics, anticancer drugs, and anesthetics, 8,9 and EG is used as a solvent and a stabilizer for many oral and topical drugs. 10 Furthermore, PC plays an essential role in various oral clinical therapeutic applications, 11,12 and PEG is commonly used in the production of plaque-reducing toothpastes and mouthwashes. 13,14 The key design consideration for the transesterification reaction between CH EG selectivity in the overall reaction system.…”

The Shear Bond Strength between Milled Denture Base Materials and Artificial Teeth: A Systematic Review

“…Recently, with developments in science and technology, new materials in removable prosthodontics have been disclosed [ 30 ]. Technological progress in dental medicine has enabled the usage of digital methods (computer-aided design/computer-aided manufacturing [CAD/CAM]), including subtractive and additive technologies for denture base manufacturing [ 29 , 31 , 32 , 33 ].…”