Akin Hakan, Kirmali Omer, Tugut Faik, Coskun Mehmet Emre
1 Department of Prosthodontics, Faculty of Dentistry, Cumhuriyet University , Sivas, Turkey .
Photomed Laser Surg. 2014 Sep;32(9):512-6. doi: 10.1089/pho.2014.3732. Epub 2014 Aug 7.
The purpose of this study was to investigate the effects of various surface pretreatments in the ridge lap area of acrylic resin denture teeth on the shear bond strength to heat-polymerized polymethylmethacrylate (PMMA) denture base resin.
Tooth debonding of the denture is a major problem for patients with removable prostheses.
A total of 84 central incisor denture teeth were used in this study. Seven test groups with 12 specimens for each group were prepared as follows: untreated (control, group C), ground, with a tungsten carbide bur (group H), airborne-particle abrasion (group AA), primed with methyl methacrylate (group M), treated with izobutyl methacrylate (group iBMA), Eclipse Bonding Agent applied (group E), and Er:YAG laser irradiated (group L). Test specimens were produced according to the manufacturers' instructions and mounted to a universal testing machine for shear testing with a crosshead speed of 1 mm/min. Data were evaluated by one way variance analysis (ANOVA) and Tukey's test (α=0.05).
Similar bond strength values were found between groups L and M, and these were the highest shear bond strengths among the groups. The lowest one was observed in group E. All surface treatments, except group E, exhibited significant difference when compared with group C (p<0.05).
Lasing of the ridge lap area to enhance the bond strength of acrylic resin denture teeth to PMMA denture base resin might be an alternative to wetting with MMA monomer. To overcome tooth debonding, surface treatment of the ridge lap area should be performed as part of denture fabrication.
本研究旨在调查丙烯酸树脂假牙牙齿嵴部搭接区域的各种表面预处理对其与热聚合聚甲基丙烯酸甲酯（PMMA）假牙基托树脂之间剪切粘结强度的影响。
假牙的牙齿脱粘是可摘义齿患者面临的一个主要问题。
本研究共使用84颗中切牙假牙牙齿。制备了7个试验组，每组12个标本，具体如下：未处理（对照组，C组）、用碳化钨车针打磨（H组）、空气颗粒喷砂处理（AA组）、用甲基丙烯酸甲酯预处理（M组）、用甲基丙烯酸异丁酯处理（iBMA组）、应用Eclipse粘结剂（E组）以及用铒激光照射（L组）。根据制造商的说明制作测试标本，并安装到万能试验机上进行剪切测试，十字头速度为1毫米/分钟。数据通过单因素方差分析（ANOVA）和Tukey检验（α=0.05）进行评估。
L组和M组之间的粘结强度值相似，且这些是所有组中最高的剪切粘结强度。E组的粘结强度最低。与C组相比，除E组外的所有表面处理均表现出显著差异（p<0.05）。
对嵴部搭接区域进行激光处理以提高丙烯酸树脂假牙牙齿与PMMA假牙基托树脂的粘结强度可能是用甲基丙烯酸甲酯单体进行湿润处理的一种替代方法。为克服牙齿脱粘问题，应在假牙制作过程中对嵴部搭接区域进行表面处理。
