Abstract
Debonding and detachment of artificial teeth from the denture base is frequently encountered in prosthodontic practice. This study aims to assess the effect of modifications in the ridge-lap surface of denture teeth with various combinations of mechanical and chemical surface treatments with hydrofluoric acid on bond strength with the acrylic denture base resin and to identify the failure modes (adhesive, cohesive, or mixed). Seventy acrylic resin teeth samples were randomly divided into seven groups (n = 10): a control group (unmodified) and six treatment groups, in which various combinations of mechanical and chemical surface treatments were performed. Then, these teeth were attached to a heat-cured denture base resin block at 45° angulation. The acrylized test samples were thermocycled, and the compressive bond strength was evaluated using a universal mechanical testing machine. The results suggest that roughening with diamond burs yields the highest bond strength, whereas etching/grooving and air abrasion result in the lowest bond strength. Acid etching complemented air abrasion to improve bond strength, while negative effects were noted with acid etching in other groups. Furthermore, roughening at the neck portion of the acrylic teeth can be used by the manufacturing companies as a standard to provide higher bond strength while maintaining the esthetics of the anterior teeth.
Highlights
Geriatric patients often seek the replacement of missing natural teeth to restore speech, function, and esthetics
This study aims to assess the effect of modifications in the in the ridge-lap of denture teeth withcombinations various combinations of mechanical and ridge-lap surface surface of denture teeth with various of mechanical and chemical chemical surface treatments with onstrength the bond strength with denture the acrylic denture surface treatments with HF acid onHF
The mean maximum compressive load (N) was compared for Groups 1–7 using the one-way ANOVA test, and the results suggested a significant difference among all the groups
Summary
Geriatric patients often seek the replacement of missing natural teeth (partial or complete) to restore speech, function, and esthetics. A durable, strong, and biologically acceptable denture necessitates the use of a favorable and superior-quality denture base [1]. Polymethyl methacrylate (PMMA) has been widely used for manufacturing denture bases in conglomeration with artificial teeth for a variety of prostheses. The use of acrylic teeth and denture bases has emerged as a common practice in implant dentistry in either implant- or implant-tissue-supported dentures [2]. PMMA has been commonly used for the manufacturing of several prostheses owing to its advantages, such as low cost, low-water sorption and solubility, excellent translucency impersonating natural teeth (even in the thinnest sections), ability to bond chemically to the denture base, superior strength, durability, and reparability [3].
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