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首页> 外文期刊>The Journal of Prosthetic Dentistry >In vitro fracture strength of teeth restored with different all-ceramic crown systems.
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In vitro fracture strength of teeth restored with different all-ceramic crown systems.

机译：用不同的全瓷冠系统恢复牙齿的体外断裂强度。

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Statement of problem There is insufficient knowledge of the strength of all-ceramic crowns bonded to natural teeth to warrant the use of all-ceramic crowns in place of metal-ceramic crowns. Purpose The purpose of this study was to evaluate and compare fracture resistance of crowns made of 3 different types of 2 all-ceramic crown systems-0.4-mm and 0.6-mm aluminum oxide coping crowns and zirconia ceramic coping crowns-and metal-ceramic crowns. Material and methods Forty intact, noncarious human maxillary central incisors were divided into 4 groups (n=10): Group MCC (control), metal-ceramic crown (JRVT High Noble Alloy); Group AC4, crown with 0.4-mm aluminum oxide coping (Procera AllCeram); Group AC6, crown with 0.6-mm aluminum oxide coping (Procera AllCeram); and Group ZC6, crown with 0.6-mm zirconia ceramic coping (Procera AllZirkon). Teeth were prepared for complete-coverage all-ceramic crowns so that a final dimension of 5.5 +/- 0.5 mm was achieved incisocervically, mesiodistally, and faciolingually.A 1.0-mm deep shoulder finish line was used with a rounded internal line angle. All restorations were treated with bonding agent (Clearfil SE Bond) and luted with phosphate-monomer-modified adhesive cement (Panavia 21). Fracture strength was tested with a universal testing machine at a crosshead speed of 2 mm per minute with an angle of 30 degrees to the long axis of the tooth after restorations were stored in 100% relative humidity of a normal saline solution for 7 days. The mode of fracture was examined visually. Means were calculated and analyzed with 1-way ANOVA and Tukey's HSD (alpha=.05). Results The means of fracture strength were: Group MCC, 405 +/- 130 N; Group AC4, 447 +/- 123 N; Group AC6, 476 +/- 174 N; and Group ZC6, 381 +/- 166 N. There was no significant difference between groups ( P =.501). The mode of failure for all specimens was fracture of the natural tooth. Conclusions There was no significant difference in the fracture strength of the teeth restored with all-ceramic crowns with 0.4- and 0.6-mm aluminum oxide copings, 0.6-mm zirconia ceramic copings, and metal ceramic crowns.
机译：问题陈述对与天然牙齿粘结的全瓷冠的强度了解不足，不能保证使用全瓷冠代替金属陶瓷冠。目的本研究的目的是评估和比较由3种不同类型的2种全陶瓷冠系统（0.4毫米和0.6毫米氧化铝顶盖，氧化锆陶瓷顶盖和金属陶瓷顶盖）制成的顶盖的抗断裂性能。 。材料和方法40例完整，非龋齿的人类上颌中切牙分为4组（n = 10）：MCC组（对照组），金属陶瓷冠（JRVT高贵金属合金）; AC4组，表冠带有0.4毫米氧化铝顶盖（Procera AllCeram）; AC6组，表冠带有0.6毫米氧化铝顶盖（Procera AllCeram）; ZC6组，表冠带有0.6毫米氧化锆陶瓷顶盖（Procera AllZirkon）。准备好用于完全覆盖全瓷冠的牙齿，以便在等腰，近中距和舌尖上最终达到5.5 +/- 0.5 mm的最终尺寸。使用1.0毫米深的肩部终点线，并将其内线角设为圆形。所有修复体均用粘合剂（Clearfil SE Bond）进行处理，并用磷酸盐单体改性的胶粘剂（Panavia 21）浸润。修复体在100％相对湿度的生理盐水溶液中存储7天后，用万能试验机以每分钟2 mm的十字头速度与牙齿长轴成30度角测试断裂强度。肉眼检查骨折的方式。使用1向ANOVA和Tukey HSD（alpha = .05）计算和分析平均值。结果断裂强度的平均值为：MCC组，405 +/- 130N。 AC4组，447 +/- 123 N; AC6组，476 +/- 174 N;和ZC6组，381 +/- 166N。各组之间无显着差异（P = .501）。所有标本的破坏方式都是天然牙齿的断裂。结论分别采用0.4和0.6 mm氧化铝涂层，0.6 mm氧化锆陶瓷涂层和金属陶瓷冠的全陶瓷冠修复的牙齿的断裂强度没有显着差异。

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