Abstract
Aims: To evaluat the microleakage of four types of soft Liners materials(Vertex, Molloplast B, Bony plus and Silicon promedica) with different surface treatment: acetone, monomer, and laser at different period of storage to highly impact acrylic resin. Materials and Methods: Two hundred and forty spe-cimens for microleakage have been prepared , each specimens consists of two parts: acrylic resin den-ture base part (30mm) diameter , ( 2mm) thickness of acrylic resin and (30mm) diameter, (2mm) thik-ness of soft liners. Soft denture liners bonded to three different groups of surface treatment: acetone, monomer, laser treated to denture base resin. Microleakage specimens underwent three aging proce-dures: storage at one week, one month without thermocyling and one month with thermocyling inside 2% methylen blue dye in 600 cycles. Results: The results showed that microleakage of Vertex and Molloplast_B in one week and in one month without thermocyling were the lowest value from the oth-er types , in one month with thermocyling the vertex was the lowest of microleakage than oth-ers.Treating the surface of denture bases with acetone and monomer had the highest value of microlea-kage from other types of surface treatment in one week ,while in one month without thermocyling and one month with thermocycle, there were no significant difference in microleakage among the the dif-ferent types of surface treatment of acrylic resin Conclusions: Permanent soft liner of acrylic type (ver-tex) had the lowest values of microleakage after different periods of storage and thermocyling .
Highlights
Soft liners defined as soft, resilient materials forming a cushioned layer between the hard denture base and the oral mucosa (1)
One way analysis of variance (ANOVA) test was shown in Tables (1, 2and3) and Duncan’s multiple range test Figures (4, 5 and 6) demonstrated that there was a significant difference at p≤ 0.05 in the microleakage for the four types of soft liners (Vertex, Molloplast_B, Bony plus and Silicone promedica) after one week, one month without thermocyling and one month with thermocycling
One way analysis of variance (ANOVA) test as shown in Tables (4 and 6) and Duncan’s multiple range test (Figures 7 and 8) demonstrated that there was a significant difference at p ≤0.05 of microleakage for the four types of surface treatment after one week and one month with thermocycling
Summary
Soft liners defined as soft, resilient materials forming a cushioned layer between the hard denture base and the oral mucosa (1). Microleakage is a major factor effect the bond of a materials and microbial accumulation. The success of the materials depends on the ability to prevent leakage(2,3). Thermal cycling promotes leaching out of unpolymerized ingredient components and cause leakage of materials.(4). Polymethylmethacrylate used in dental prosthetic device for almost 70 years. Three fundamental feature have contributed for its success. Simple processing.(5) Because of the risk of fracture if patients drop their dentures, high impact strength is a desirable property. Given the function of a denture base in a removable prosthesis, high flexural strength, flexural modulus, and a large yield point distance www.rafidaindentj.net
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