Abstract
Objective: The present study was oriented to estimate the effect of different surface treatments on the microleakage between the soft liner and acrylic with and without the use of autoclave as disinfection method. Material and Methods: Sixty samples were split into two groups: the autoclaved groups and non-autoclaved groups. Each one subdivided into three groups: first one without any treatments as a control group; in the second group surface of the samples were treated with CO2 laser (10.6 nm wavelength for 15 seconds), and in the third group the surface was treated with sandblasting. All the samples exposed to thermocycling, then the microleakage test was evaluated by gauging dye penetration depth between the soft liner and acrylic disc using a digital microscope. Data analyzed statistically by One-way ANOVA and Tukey's post-hoc tests. In addition, t-test was used for comparison between two groups . Results: The maximum mean values for the microleakage were observed in the untreated group (control) followed by the group treated by CO2 laser and the lowest mean value of microleakage was related to the third group for both non-autoclaved and autoclaved groups with significant differences among them. In addition, depending on the use of autoclave, there was non-significant in all studied groups. Conclusions: There was a decrease in the microleakage when the surface treated with CO2 laser and sandblast. The use of autoclave did not badly change the microleakage between the soft liner and denture base. Keywords Microleakage; Soft liner; Autoclave; CO2 laser; Sandblast.
Highlights
The soft liners have been widely utilized for prosthetic denture as a cushion on the tissue surface for removable dentures and maxillofacial prosthesis [1,2] due to viscoelastic properties[3]
In this study sixty polymethylmethacrylate denture base resin (Heat-cured denture base resin, vertex, Netherlands) were supplied in a disc shape (30 mm in diameter and 2 mm in thickness) [23], these specimens were heat cured in a water bath according to the manufacturer’s directions which were processed by a short curing cycle (74 oC for 1.5 hours boiling for 30 minutes), they were extracted from the flask and all flashes were trimmed and the accurate measurements of each specimen and verified by a caliper device (Renfert, Germany) from different points
Third group: 20 specimens were roughened by sandblasting machine (No.900036327, China) by airborne particle abrasion with 250 μm Al2O3 on the treated surface of a disc shape acrylic denture base resin at a pressure of 0.62 Mpa for 30 seconds [17] a special holder was custom made to fix the tip of the nozzle and the specimen during the sandblast procedure without affecting the constant distance between the treated surface of the specimens and the tip of the nozzle
Summary
The soft liners have been widely utilized for prosthetic denture as a cushion on the tissue surface for removable dentures and maxillofacial prosthesis [1,2] due to viscoelastic properties[3]. They belong to the resilient materials indicated for relining the inner surfaces of denture base to withstand the stressbearing area [4]. Various surface pretreatments have been done to enhance the bond strength and evaluate microleakage between the liner and denture base [17]. Some of these are roughening the bonding surface by airborne-particle abrasion, laser, or by the monomer [11,18]
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