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.
Highlights
Even though dental implants have garnered a lot of attention and have had a lot of success in treating patients who have lost all or some teeth, dentures are still the best option for treating patients with partial or complete loss of their dentition [1].Polymeric materials are used in the fabrication of complete and partial dentures
Polymethyl methacrylate (PMMA), is a widely used denture base material owing to its favourable properties such as pleasing aesthetics, adaptation, and stability over denture foundation area, accessible laboratory and clinical manipulation, and inexpensive equipment [3]
Various studies have discussed the shear bonding strength between acrylic teeth and acrylic denture base resin, considering surface treatment modifications, thermocycling, polymerisation method, teeth type, etc. None reported this property between acrylic teeth and the polycarbonate denture base. is study was conducted to investigate the effect of thermocycling and various surface modifications on shear bond strength of acrylic teeth to polycarbonate denture base material after considering the following proposed research hypotheses where
Summary
Even though dental implants have garnered a lot of attention and have had a lot of success in treating patients who have lost all or some teeth, dentures are still the best option for treating patients with partial or complete loss of their dentition [1]. Poly(bisphenol A) carbonate is an amorphous polymer It is transparent and light in weight, with appropriate mechanical properties. Numerous studies have reported the shear bond strength between acrylic teeth and acrylic denture bases. Some studies [4, 8, 16] have mentioned an adverse effect of thermocycling on shear bond strength between acrylic teeth and denture resins. Various studies have discussed the shear bonding strength between acrylic teeth and acrylic denture base resin, considering surface treatment modifications, thermocycling, polymerisation method, teeth type, etc. Still, none reported this property between acrylic teeth and the polycarbonate denture base. None reported this property between acrylic teeth and the polycarbonate denture base. is study was conducted to investigate the effect of thermocycling and various surface modifications on shear bond strength of acrylic teeth to polycarbonate denture base material after considering the following proposed research hypotheses where (1) e null hypothesis (H0) proposes that neither surface modifications nor thermocycling affects the shear bond strength between the acrylic teeth and the polycarbonate denture base material (2) e alternative hypothesis (H1) assumed that either surface modifications or thermocycling affects the shear bond strength between the acrylic teeth and the polycarbonate denture base material
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