Bharat J S V, Naidu D Lakshmayya, Reddy M Venugopal, Naveen P, Rao N Venugopal
Department of Prosthodontics, KLR's Lenora Institute of Dental Sciences and Hospital, Rajahmundry, Andhra Pradesh, India.
J Contemp Dent Pract. 2012 Nov 1;13(6):850-5. doi: 10.5005/jp-journals-10024-1241.
This study is to evaluate the role of 1:1 v/v 30% trichloromethane and monomer solvent in enhancing the durability of bonding between cross-linked acrylic teeth and different heatcured denture bases with or without mechanical preparations made on ridge lap portion of the artificial teeth.
Two high impact denture base resin materials (Trevalon HI, DeTrey, UK, and DPI Tuff, Mumbai) and one nonhigh impact denture base resin material (DPI Quick Set, Mumbai) were selected to form three groups. Each group contains 30 specimens prepared by five different methods. A mixture of 30% trichloromethane and monomer, mixed in the ratio of 1:1 and applied for 1 minute on the ridge lap area of experimental specimens of methods--B, C, D and E (Specimens of method--A being control group, where no alterations were made at the ridge lap portion of acrylic teeth) before curing. Hounsfield universal testing machine is employed to evaluate the comparative bond strengths.
No significant difference was seen in bond strengths between specimens of experimental methods in all groups. When each group was assessed separately method B specimens in group 1 (739.2 N), group 2 (758 N) and method D specimens in group 3 (729 N) showed highest mean bond strengths. Control group specimens showed the least bond strength (400-460 N) in all groups with more adhesive failures.
Ridge lap portion of the specimens treated with chemical solvent as in method B showed increased bond strength in groups 1 and 2. Hence, this is a preferred method.
Evaluation of effect of different chemical and mechanical preparations at the ridge lap areas of acrylic teeth before acrylization helps the clinician and technician to overcome the problem of debonding of teeth from denture bases and in turn provides better quality prosthesis to the patient.
本研究旨在评估1:1体积比的30%三氯甲烷与单体溶剂在增强交联丙烯酸牙与不同热固化义齿基托之间结合耐久性方面的作用，这些义齿基托在人工牙的嵴部搭接处有无进行机械预备。
选用两种高抗冲义齿基托树脂材料（英国德瑞的Trevalon HI和孟买的DPI Tuff）和一种非高抗冲义齿基托树脂材料（孟买的DPI Quick Set），形成三组。每组包含通过五种不同方法制备的30个样本。在固化前，将按1:1比例混合的30%三氯甲烷和单体混合物涂覆在方法B、C、D和E的实验样本的嵴部搭接区域1分钟（方法A的样本作为对照组，在丙烯酸牙的嵴部搭接处未做任何改动）。使用霍恩斯菲尔德万能试验机评估比较粘结强度。
所有组中实验方法的样本之间粘结强度无显著差异。当分别评估每组时，第1组的方法B样本（739.2牛）、第2组的方法B样本（758牛）和第3组的方法D样本（729牛）显示出最高的平均粘结强度。对照组样本在所有组中粘结强度最低（400 - 460牛），且粘结失败更多。
在第1组和第2组中，如方法B那样用化学溶剂处理的样本的嵴部搭接处显示出粘结强度增加。因此，这是一种优选方法。
在丙烯酸化之前评估丙烯酸牙嵴部搭接区域不同化学和机械预备的效果，有助于临床医生和技师克服牙齿与义齿基托脱粘的问题，进而为患者提供质量更好的修复体。
