Abstract
The aim of this study was to compare the bond strength between acrylic denture base and teeth subjected to 6 surface treatments. Ninety-six specimens were made with poly(methylmethacrylate) teeth bonded to a microwave-polymerized acrylic denture base material. The specimens were distributed into 6 groups (n=16) according to surface treatments: CT - no treatment (control); MN - methylmethacrylate monomer etching; AO - 50-microm-particle aluminum oxide air abrasion; BR - glaze removal with a round bur; ST - surface grinding with an aluminum oxide abrasive stone; group CV - cavity preparation (diatorics). The control and surface-treated groups were subjected to a compressive load at 45 masculine angle to the long axis of the teeth. Data were analyzed by one-way ANOVA, followed by Scheffé's test (p<0.05). Bond strength means and (SD) in kgf for groups were: CT: 18.19 (7.14), MN: 18.34 (5.28), AO: 23.82 (5.40), BR: 23.30 (4.79), ST: 25.39 (7.80) and CV: 17.48 (7.17). There was statistically significant difference (p=0.037997) only between ST and CV. In conclusion, ridge lap surface grinding with an aluminum oxide abrasive stone provided the highest bond strength, though it differed significantly only when compared to diatorics. The other surface treatments provided similar bond between the acrylic denture base and teeth.
Highlights
The bond strength of different denture teeth to their denture bases can be high enough to cause tooth fracture without debonding [1]
The aim of this study was to evaluate the influence of surface treatments on the ridge lap area of poly(methylmethacrylate) (PMMA) acrylic denture teeth on their bond strength to a microwave-polymerized PMMA denture base material
Only cohesive failures in the tooth associated with cohesive in the denture base (n=89), and mixed failures (n=7) occurred
Summary
The bond strength of different denture teeth to their denture bases can be high enough to cause tooth fracture without debonding [1]. Bond failures between plastic teeth and heat-polymerized denture base resins can occur [3], and remain a major problem in prosthodontic practice [4]. The bond between acrylic denture teeth and denture base materials remains unreliable, inconsistent and unpredictable [2,5]. The following causes of tooth debonding are well known: excessive stress, fatigue, insufficient tooth cleaning during denture base acrylic resin placement, wax and tinfoil substitute contamination, defective properties of materials [8,9,10] and inappropriate heat-polymerizing technique [11]
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