PURPOSE. This study investigated the effect of laser parameters and air-abrasion on the peel strength of silicon-based soft denture liner to different denture resins. MATERIALS AND METHODS. Specimens (N=180) were prepared out of three different denture base resins (Rodex, cross-linked denture base a...
PURPOSE. This study investigated the effect of laser parameters and air-abrasion on the peel strength of silicon-based soft denture liner to different denture resins. MATERIALS AND METHODS. Specimens (N=180) were prepared out of three different denture base resins (Rodex, cross-linked denture base acrylic resin; Paladent, heat-cured acrylic resin; Deflex, Polyamide resin) ($75mm{\times}25mm{\times}3mm$). A silicon-based soft denture liner (Molloplast B) was applied to the denture resins after the following conditioning methods: a) Air-abrasion ($50{\mu}m$), b) Er,Cr:YSGG laser (Waterlase MD Turbo, Biolase Technology) at 2 W-20 Hz, c) Er,Cr:YSGG laser at 2 W-30 Hz, d) Er,Cr:YSGG laser at 3 W-20 Hz, e) Er,Cr:YSGG laser at 3 W-30 Hz. Non-conditioned group acted as the control group. Peel test was performed in a universal testing machine. Failure modes were evaluated visually. Data were analyzed using two-way ANOVA and Tukey's test (${\alpha}$=.05). RESULTS. Denture liner tested showed increased peel strength after laser treatment with different parameters ($3.9{\pm}0.4-5.58{\pm}0.6$ MPa) compared to the control ($3.64{\pm}0.5-4.58{\pm}0.5$ MPa) and air-abraded groups ($3.1{\pm}0.6-4.46{\pm}0.3$ MPa), but the results were not statistically significant except for Paladent, with the pretreatment of Er,Cr:YSGG laser at 3 W-20 Hz. Polyamide resin after air-abrasion showed significantly lower peel strength than those of other groups ($3.1{\pm}0.6$ MPa). CONCLUSION. Heat-cured acrylic resin, PMMA, may benefit from Er,Cr:YSGG laser treatment at 3 W-20 Hz irradiation. Air-abrasion of polyamide resins should be avoided not to impair their peel bond strengths to silicon-based soft denture liners.
PURPOSE. This study investigated the effect of laser parameters and air-abrasion on the peel strength of silicon-based soft denture liner to different denture resins. MATERIALS AND METHODS. Specimens (N=180) were prepared out of three different denture base resins (Rodex, cross-linked denture base acrylic resin; Paladent, heat-cured acrylic resin; Deflex, Polyamide resin) ($75mm{\times}25mm{\times}3mm$). A silicon-based soft denture liner (Molloplast B) was applied to the denture resins after the following conditioning methods: a) Air-abrasion ($50{\mu}m$), b) Er,Cr:YSGG laser (Waterlase MD Turbo, Biolase Technology) at 2 W-20 Hz, c) Er,Cr:YSGG laser at 2 W-30 Hz, d) Er,Cr:YSGG laser at 3 W-20 Hz, e) Er,Cr:YSGG laser at 3 W-30 Hz. Non-conditioned group acted as the control group. Peel test was performed in a universal testing machine. Failure modes were evaluated visually. Data were analyzed using two-way ANOVA and Tukey's test (${\alpha}$=.05). RESULTS. Denture liner tested showed increased peel strength after laser treatment with different parameters ($3.9{\pm}0.4-5.58{\pm}0.6$ MPa) compared to the control ($3.64{\pm}0.5-4.58{\pm}0.5$ MPa) and air-abraded groups ($3.1{\pm}0.6-4.46{\pm}0.3$ MPa), but the results were not statistically significant except for Paladent, with the pretreatment of Er,Cr:YSGG laser at 3 W-20 Hz. Polyamide resin after air-abrasion showed significantly lower peel strength than those of other groups ($3.1{\pm}0.6$ MPa). CONCLUSION. Heat-cured acrylic resin, PMMA, may benefit from Er,Cr:YSGG laser treatment at 3 W-20 Hz irradiation. Air-abrasion of polyamide resins should be avoided not to impair their peel bond strengths to silicon-based soft denture liners.
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제안 방법
Before surface treatments, the specimens were allowed to air dry for 24 hours. Six samples of each material were selected randomly to be investigated by scanning electron microscope (SEM; EVO L10, Carl Zeiss, Oberkochen, Germany) for differences in surface morphology after pretreatments. To create a space for the soft liner material, the acrylic specimens were reflasked using fresh pink wax material.
The aim of the present study was to evaluate the effect of air-abrasion and laser treatment with different parameters on the bond strength of a silicone-based soft denture liner (Molloplast-B) to three different commonly used denture resins [a polyamide based high impact thermo-injection molded denture material (Deflex; Nuxen SRL, Ayacucho 1053 3-A, Cap. Fed. Buenos Aires, Argentina), a heat-cured cross-linked acrylic resin (Rodex; Rodont, Srl Milan, Italy Rodex) and a conventional heat-cured acrylic resin (Paladent; HeraeusKulzer GmbH, Wehrheim, Germany)] using the peel test. The null hypothesis was that the air- abrasion and laser treatment with different pulse frequencies and power levels would not improve the peel bond strengths of silicone-based soft denture liner to different denture resins.
The laser etching procedures (Group 3, 4, 5 and 6) were performed with an Er,Cr: YSGG laser system (Waterlase MD; Biolase Technology, San Clemente, CA) operating at a wavelength of 2,780 nm, a pulse duration of 140-200 μs, and repetition rates of 20 Hz (20 pulses per second) or 30 Hz (30 pulses per second).
대상 데이터
The polyamide resin base was also prepared according to manufacturer’s instructions. A total of 198 test specimens consisting of 66 Paladent, 66 Rodex and 66 Deflex specimens were prepared using these techniques. The specimens were placed in covered denture caps and stored in distilled water at 37℃ until the surface treatment simulated typical denture storage.
So as to prepare the peel test materials, a mold of (75 mm × 25 mm × 3 mm) (ASTM D1876) was prepared from aluminum sheet and with the help of which specimens were produced from three plates of pink wax. For each test material, 66 wax specimens were produced (11 for each group) in which 198 wax specimens came out. The heat-cured samples were prepared in stone molds in denture flasks and were cured in a manner which is similar to that used in conventional denture construction.
Three different denture base resins, a cross-linked denture base acrylic resin (Rodex), a heat-cured acrylic resin (Paladent) and a polyamide resin (Deflex), as well as a heat-polymerized silicone-based resilient liner (Molloplast-B) were used in this study. The brand names, types and manufacturers of the materials used in this study are presented in Table 1.
성능/효과
Within the limitations of this study, it can be concluded that heatcured acrylic resin, PMMA, may benefit from Er,Cr:YSGG laser treatment at 3 W-20 Hz irradiation. Air-abrasion of polyamide resins should be avoided not to impair their peel bond strengths to silicon-based soft denture liners.
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