Peel bond strength of resilient liner modified by the addition of antimicrobial agents to denture base acrylic resin

In order to prolong the clinical longevity of resilient denture relining materialsand reduce plaque accumulation, incorporation of antimicrobial agents into thesematerials has been proposed. However, this addition may affect their properties.

Objective

This study evaluated the effect of the addition of antimicrobial agents into onesoft liner (Soft Confort, Dencril) on its peel bond strength to one denture base(QC 20, Dentsply).

Material and Methods

Acrylic specimens (n=9) were made (75x10x3 mm) and stored in distilled water at37ºC for 48 h. The drug powder concentrations (nystatin 500,000U - G2;nystatin 1,000,000U - G3; miconazole 125 mg - G4; miconazole 250 mg - G5;ketoconazole 100 mg - G6; ketoconazole 200 mg - G7; chlorhexidine diacetate 5% -G8; and 10% chlorhexidine diacetate - G9) were blended with the soft liner powderbefore the addition of the soft liner liquid. A group (G1) without any drugincorporation was used as control. Specimens (n=9) (75x10x6 mm) were plasticizedaccording to the manufacturers'' instructions and stored in distilled water at37ºC for 24 h. Relined specimens were then submitted to a 180-degree peeltest at a crosshead speed of 10 mm/min. Data (MPa) were analyzed by analysis ofvariance (α=0.05) and the failure modes were visually classified.

Results

No significant difference was found among experimental groups (p=0.148). Cohesivefailure located within the resilient material was predominantly observed in alltested groups.

Conclusions

Peel bond strength between the denture base and the modified soft liner was notaffected by the addition of antimicrobial agents.