Venus Henrike, Boening Klaus, Peroz Ingrid
Department of Prosthodontics, Universitätsklinikum Carl Gustav Carus Dresden, Dresden, Germany.
Quintessence Int. 2011 Sep;42(8):669-77.
To compare the dimensional changes of two autopolymerising denture base resins using three different processing techniques.
Sixty edentulous denture bases were made from the polymethylmethacrylates FuturaGen and PalaXpress. Ten bases were made from each resin using a manual injection technique (MI), a pneumatic injection technique (PI), and the fluid resin technique (F). Posterior palatal gap widths between casts and denture bases were measured. For an additional three-dimensional examination of occlusal changes, 10 maxillary dentures were made using FuturaGen/MI and 10 using PalaXpress/PI. Intermolar widths and changes in vertical dimension were determined. In all groups, measurements were taken after polymerization, after removal and repositioning, after polishing, and after storage in water for 1 and 3 weeks. Data were analyzed by using two-way ANOVA and Tukey test (P < .05).
There were no differences in dimensional changes of FuturaGen and PalaXpress specimens. The pneumatic injection system produced significantly smaller posterior palatal gaps after storage in water for 3 weeks compared to the manual injection system (P < .0005) and the fluid resin technique (P = .003). The posterior gaps of dentures were ⋜ 0.04 mm and below the recommended depth for carving a posterior palatal seal (0.4 to 3.0 mm).
The processing technique rather than the choice of the two resins seems to be the dominate variable with respect to dimensional changes.
比较两种自凝义齿基托树脂采用三种不同加工技术时的尺寸变化。
用聚甲基丙烯酸甲酯FuturaGen和PalaXpress制作60个无牙颌义齿基托。每种树脂分别采用手工注射技术（MI）、气动注射技术（PI）和流体树脂技术（F）制作10个基托。测量模型与义齿基托之间的后腭间隙宽度。为了对咬合变化进行额外的三维检查，用FuturaGen/MI制作10个上颌义齿，用PalaXpress/PI制作10个上颌义齿。测定磨牙间宽度和垂直维度的变化。在所有组中，分别在聚合后、取出并重新就位后、抛光后以及在水中储存1周和3周后进行测量。采用双向方差分析和Tukey检验分析数据（P < 0.05）。
FuturaGen和PalaXpress标本的尺寸变化没有差异。与手工注射系统（P < 0.0005）和流体树脂技术（P = 0.003）相比，气动注射系统在水中储存3周后产生的后腭间隙明显更小。义齿的后间隙≤0.04 mm，低于雕刻后腭封闭区的推荐深度（0.4至3.0 mm）。
就尺寸变化而言，加工技术而非两种树脂的选择似乎是主要变量。
