Andrade de Freitas Sandra Lúcia, Brandt William Cunha, Miranda Milton Edson, Vitti Rafael Pino
Department of Prosthodontics, School of Dentistry, São Leopoldo Mandic, Campinas, SP, Brazil.
Department of Implantology, School of Dentistry, University of Santo Amaro, São Paulo, SP, Brazil.
Int J Dent. 2018 Jun 4;2018:2374327. doi: 10.1155/2018/2374327. eCollection 2018.
To evaluate the shear bond strength between different artificial teeth and denture base polymerized by two polymerization methods submitted to thermocycling.
Two acrylic resins were selected according to the polymerization method (water-bath and microwave), and four different artificial teeth (Biotone, Dentsply; Trilux, Vipi Dent; Premium 8, Heraeus Kulzer; Soluut PX, Yamahachi) were also tested. The polymerization of the acrylic resin was performed by using conventional cycle (8 h at 74°C) in water-bath and using two cycles (20 min at 270 W + 5 min at 360 W) by the microwave method. The shear bond strength was evaluated after 24 h of water storage at 37°C (immediately) and after the thermocycling test (5,000 cycles, 5-55°C). The shear bond strength (=10) was performed using a universal testing machine (Instron 4411) at a crosshead speed of 1.0 mm/min. Modes of failures were classified as cohesive and adhesive. The data (MPa) were statistically analyzed by three-way ANOVA, and the mean values were compared by the Tukey test ( = 0.05).
In general, the polymerization by microwave showed the highest shear bond strength values, and Trilux artificial teeth had the lowest bond strength values ( < 0.05). Thermocycling did not affect the shear bond strength ( < 0.05). There was a predominance of cohesive failures for all groups.
The chemical composition of the artificial teeth affects the bond strength, and the microwave method is preferable to perform the acrylic resin polymerization.
评估通过两种聚合方法聚合的不同人工牙与义齿基托之间的剪切粘结强度，并进行热循环测试。
根据聚合方法（水浴和微波）选择两种丙烯酸树脂，并测试四种不同的人工牙（Biotone，登士柏；Trilux，Vipi Dent；Premium 8，贺利氏古莎；Soluut PX，雅马哈齿科）。丙烯酸树脂的聚合通过在水浴中采用常规循环（74°C下8小时）以及通过微波方法采用两个循环（270W下20分钟+360W下5分钟）进行。在37°C下储存24小时（立即）后以及热循环测试（5000次循环，5 - 55°C）后评估剪切粘结强度。使用万能材料试验机（Instron 4411）以1.0mm/min的十字头速度进行剪切粘结强度（n = 10）测试。失效模式分为内聚性和粘结性。数据（MPa）通过三因素方差分析进行统计分析，平均值通过Tukey检验进行比较（α = 0.05）。
总体而言，微波聚合显示出最高的剪切粘结强度值，而Trilux人工牙的粘结强度值最低（P < 0.05）。热循环未影响剪切粘结强度（P < 0.05）。所有组均以内聚性失效为主。
人工牙的化学成分影响粘结强度，微波方法更适合进行丙烯酸树脂聚合。
