Effect of denture base surface pretreatment on microleakage of a silicone-based resilient liner

• Published in: The Journal of prosthetic dentistry 2004-09, Vol.92 (3), p.283-287
• Main Authors: Saraç, Y. Şinasi, Başoğlu, Tarik, Ceylan, Gözlem K., Saraç, Duygu, Yapici, Oktay
• Format: Article
• Language: English
• Subjects: Acrylic Resins - chemistry; Air Abrasion, Dental; Aluminum Oxide - chemistry; Analysis of Variance; Dental Leakage - classification; Dentistry; Denture Bases; Denture Liners; Diffusion; Gamma Cameras; Humans; Methylmethacrylate - chemistry; Polymethyl Methacrylate - chemistry; Radiopharmaceuticals - chemistry; Silicone Elastomers - chemistry; Surface Properties; Thallium Radioisotopes - chemistry
• ISSN: 0022-3913; 1097-6841
• DOI: 10.1016/j.prosdent.2004.06.004

Microleakage between resilient liner and denture base resins is a significant clinical problem, often responsible for debonding of the resilient liner from the denture base resin. This study investigated the effect of 2 surface treatments, airborne-particle abrasion (APA) and wetting with methyl methacrylate monomer (MMA), on microleakage between a silicone-based resilient liner and denture base resin using a gamma camera imaging technique. Thirty-three specimens, each having 2 plates measuring 40 × 40 × 2 mm, were prepared by packing and processing an acrylic denture base resin (QC-20) into square plates following manufacturer's instructions. Specimens were divided into 3 groups (n=11) as APA-, MMA-, and control-treatment groups. For the APA group, the inner surfaces of both plates were airborne-particle abraded with 250-μm Al 2O 3 particles and, for the MMA group, surfaces were treated with monomer (QC-20). Control specimens were not surface treated. Following application of an adhesive (Ufi Gel P-specific), a silicone lining material (Ufi Gel P) was prepared and applied to the inner surfaces of all 33 specimens. Eleven size-matched polymethyl methacrylate (PMMA) specimen blocks (40 × 40 × 6 mm) were prepared to calculate the level of residual radioactivity for the denture base itself, the entire outer surface count (OSC). All specimens and PMMA blocks were immersed in a radioactive solution (thallium-201 chloride) for 24 hours. Specimen activities (γ-ray cts/sec, representing thallium-201 concentration) were then measured using a high-resolution gamma camera. The amount of OSC-subtracted total specimen counts was a direct indicator of the quantity of inward diffusing tracer. The subtracted values were analyzed using a 1-way analysis of variance (ANOVA) and Bonferroni multiple comparison tests (α=.05). OSC levels averaged 754 ± 110 γ-ray cts/sec. OSC-subtracted APA, control, and MMA values were 5,546 ± 1,534, 3,392 ± 738, and 1,405 ± 392 γ-ray cts/sec, respectively. All 3 groups were significantly different ( P