Lima E M C X, Moura J S, Del Bel Cury A A, Garcia R C M R, Cury J A
Faculty of Dentistry of Piracicaba, UNICAMP, Piracicaba, SP, Brazil.
J Oral Rehabil. 2006 May;33(5):356-62. doi: 10.1111/j.1365-2842.2005.01564.x.
As denture cleansers should be able to reduce biofilm accumulation without changing the acrylic resin surface structure, this study evaluated the effect of denture cleansers on surface roughness of acrylic resin and on biofilm accumulation. It was conducted a crossover study of three phases of 4 days each and 13 volunteers wore palatal appliances containing four specimens of acrylic resin of known surface roughness which were extra-orally submitted once a day to three groups of separated treatments: (i) negative control, (ii) enzymatic commercial solution (Ortoform) or (iii) 0.5% sodium hypochlorite (NaOCl). The appliances were immersed eight times a day in a 20% sucrose solution to enhance biofilm formation. On morning of the fifth day of each phase, the amount of biofilm formed on the specimens was estimated by the amount of protein extracted with alkali and the surface roughness of the specimens was again measured. New palatal appliances with new specimens were worn by the volunteers in the following phases, but the treatments were changed. The roughness of the resin increased after the treatments (P < 0.05) but the difference among the cleansers was not statistically significant (P = 0.85). The lowest amount of biofilm formed on acrylic resin specimens was found for the treatment with NaOCl (P < 0.05) but the enzymatic product did not differ from the negative control group (P > 0.05). The data suggest that the roughness of acrylic resin was not changed by the cleansers, but the ability to reduce biofilm accumulation depended on the product used.
由于假牙清洁剂应能够减少生物膜积聚而不改变丙烯酸树脂的表面结构，本研究评估了假牙清洁剂对丙烯酸树脂表面粗糙度和生物膜积聚的影响。进行了一项交叉研究，分为三个阶段，每个阶段4天，13名志愿者佩戴含有四个已知表面粗糙度的丙烯酸树脂样本的腭部矫治器，这些样本每天一次在口外接受三组不同的处理：（i）阴性对照，（ii）酶促商业溶液（Ortoform）或（iii）0.5%次氯酸钠（NaOCl）。矫治器每天浸入20%的蔗糖溶液中八次，以促进生物膜形成。在每个阶段的第五天早晨，通过用碱提取的蛋白质含量估计样本上形成的生物膜量，并再次测量样本的表面粗糙度。在接下来的阶段，志愿者佩戴带有新样本的新腭部矫治器，但处理方式改变。处理后树脂的粗糙度增加（P < 0.05），但清洁剂之间的差异无统计学意义（P = 0.85）。用NaOCl处理的丙烯酸树脂样本上形成的生物膜量最低（P < 0.05），但酶促产品与阴性对照组无差异（P > 0.05）。数据表明，清洁剂不会改变丙烯酸树脂的粗糙度，但减少生物膜积聚的能力取决于所使用的产品。
