Desai Priti D, Das Utapal Kumar
Department of Conservative and Endodontic Dentistry, Gurunanak Institute of Dental Science and Research, Kolkata, India.
Indian J Dent Res. 2011 Nov-Dec;22(6):877. doi: 10.4103/0970-9290.94663.
The aim of this study was to evaluate the in vitro fracture resistance of teeth restored with bonded ceramic inlay and direct composite resin restoration in comparison to the normal tooth.
This study evaluated the fracture strength of the teeth restored with bonded ceramic inlay and direct composite resin restoration in comparison to the normal teeth. Thirty intact human maxillary first premolars were assigned to three groups: Group 1 - comprising sound/unprepared teeth (control). Group 2 - comprising of Class-II direct composite resin restored teeth and Group 3 - comprising Class-II ceramic inlay restored teeth. Cavities were prepared with occlusal width of 1/3 intercuspal distance and 2 mm deep pulpally. Group 2 teeth were restored with hybrid composite resin (Z350 3M ESPE, USA) and group 3 teeth were restored with Vitadur Alpha alumina (Ivoclare Vivadent, Liechtenstein, Europe). Ceramic inlay was bonded with adhesive cement (rely X resin cement of 3MESPE, USA). The specimens were subjected to a compressive load until they fractured. Data were analyzed statistically by unpaired Student's t test.
The fracture resistant strength, expressed as kilonewton (KN), was group 1 - 1.51 KN, group 2 - 1.25 KN, and group 3 - 1.58 KN. Statistically, group III had highest fracture resistance followed by group I, while group II had the lowest average fracture resistance.
The fracture resistant strength of teeth restored with ceramic inlay was comparable to that of the normal intact teeth or slightly higher, while teeth restored with direct composite resin restoration showed less fracture resistant strength than that of the normal teeth.
本研究旨在评估与正常牙齿相比，采用粘结陶瓷嵌体修复和直接复合树脂修复的牙齿的体外抗折强度。
本研究评估了与正常牙齿相比，采用粘结陶瓷嵌体修复和直接复合树脂修复的牙齿的抗折强度。将30颗完整的人类上颌第一前磨牙分为三组：第1组 - 包括完好/未预备的牙齿（对照组）。第2组 - 包括II类直接复合树脂修复的牙齿，第3组 - 包括II类陶瓷嵌体修复的牙齿。制备的窝洞咬合面宽度为牙尖间距的1/3，髓腔深度为2mm。第2组牙齿用混合复合树脂（美国3M ESPE公司的Z350）修复，第3组牙齿用维他灵Alpha氧化铝（列支敦士登欧洲义获嘉威瓦登特公司的Ivoclare Vivadent）修复。陶瓷嵌体用粘结水门汀（美国3M ESPE公司的Rely X树脂水门汀）粘结。对标本施加压缩载荷直至其断裂。数据采用非配对学生t检验进行统计学分析。
以千牛顿（kN）表示的抗折强度，第1组为1.51kN，第2组为1.25kN，第3组为1.58kN。统计学上，第III组抗折性最高，其次是第I组，而第II组平均抗折性最低。
用陶瓷嵌体修复的牙齿的抗折强度与正常完整牙齿相当或略高，而用直接复合树脂修复的牙齿的抗折强度低于正常牙齿。
