Lauria Andrezza, de Medeiros Raquel Correia, Rodrigues Danillo Costa, Sato Fábio Ricardo Loureiro, Moreira Roger William Fernandes
Department of Oral and Maxillofacial Surgery, School of Dentistry of Piracicaba, State University of Campinas (UNICAMP), Piracicaba, SP, Brazil.
Department of Oral and Maxillofacial Surgery, School of Dentistry of Piracicaba, State University of Campinas (UNICAMP), Piracicaba, SP, Brazil.
Br J Oral Maxillofac Surg. 2016 Nov;54(9):987-991. doi: 10.1016/j.bjoms.2016.07.030. Epub 2016 Sep 12.
The aim of the present study was to compare prebent and manually-bent plates used in maxillary advancement. The prebent plates were fixed in polyurethane blocks for the linear test and aluminium blocks for the cyclic test, and the manually-bent plates were fixed in polyurethane and aluminium blocks. The linear load tests were done using an Instron 4411 mechanical testing machine and the cyclic test with an Instron E3000 testing machine. The linear mechanical test showed that there was no significant difference between the plates. In the cyclic test the prebent plates reached the limit of 500000 cycles without fracturing whereas the manually-bent plate group fractured before reaching the limit of cycles (p=0.008). The decision to use prebent or manually-bent plates during operations should be influenced by the production of the bends and their consequent brittleness.
本研究的目的是比较用于上颌前徙的预弯板和手动弯板。预弯板固定在用于线性测试的聚氨酯块和用于循环测试的铝块中，手动弯板固定在聚氨酯和铝块中。线性载荷测试使用Instron 4411机械测试机进行，循环测试使用Instron E3000测试机进行。线性力学测试表明，两种板材之间没有显著差异。在循环测试中，预弯板达到了500000次循环的极限而未断裂，而手动弯板组在达到循环极限之前就发生了断裂（p=0.008）。手术中使用预弯板还是手动弯板的决定应受弯制方式及其导致的脆性的影响。
