Gialain Ivan Onone, Coto Neide Pena, Driemeier Larissa, Noritomi Pedro Yoshito, Dias Reinaldo Brito E
Faculdade de Odontologia da Universidade de São Paulo, São Paulo, Brazil.
Departamento de Engenharia Mecatrônica e Sistemas Mecânicos, Escola Politécnica da Universidade de São Paulo, São Paulo, Brazil.
Dent Traumatol. 2016 Oct;32(5):409-15. doi: 10.1111/edt.12265. Epub 2016 Mar 6.
BACKGROUND/AIM: The aim of this study was to evaluate the compressive and tensile stresses on dentin and enamel in five different situations: no mouthguard and mouthguards from 1 mm thickness up to 4 mm thickness, using finite element analysis.
A three-dimensional geometry of an upper right central incisor was obtained from a computed tomography and transformed into a mesh separating enamel from dentin. A mouthguard was created covering the buccal surface of the enamel in different thicknesses, and a rubber ball with a velocity of 5 m s(-1) was made as the impact object.
The maximum principal stress and the minimal principal stress were evaluated in all situations on dentin and enamel. Both maximum and minimal stress on enamel had the greatest value on the control situation (no mouthguard), and their value decreased as the mouthguard thickness increased. The reduction ranged from 66.62% to 85.5% for compressive stress and from 9.76% to 33.37% for tensile stress on enamel. The results for dentin were similar among the situations with or without mouthguards.
The mouthguard had beneficial effect considering the stresses on enamel, and between the mouthguard thickness of 3 and 4 mm, there was minimum difference.
背景/目的：本研究旨在通过有限元分析评估五种不同情况下牙本质和牙釉质上的压缩应力和拉伸应力，这五种情况分别为：不使用护齿器以及使用厚度从1毫米到4毫米的护齿器。
从计算机断层扫描中获取右上中切牙的三维几何模型，并将其转换为将牙釉质与牙本质分离的网格模型。制作不同厚度的覆盖牙釉质颊面的护齿器，并将速度为5米/秒的橡胶球作为撞击物体。
评估了所有情况下牙本质和牙釉质上的最大主应力和最小主应力。牙釉质上的最大应力和最小应力在对照情况（不使用护齿器）下均具有最大值，并且随着护齿器厚度增加其值降低。牙釉质上压缩应力的降低范围为66.62%至85.5%，拉伸应力的降低范围为9.76%至33.37%。有无护齿器情况下牙本质的结果相似。
考虑到牙釉质上的应力，护齿器具有有益效果，并且在护齿器厚度为3至4毫米之间差异最小。
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