Coronal resistance to fracture of endodontically treated teeth submitted to light-activated bleaching
Coronal resistance to fracture of endodontically treated teeth submitted to light-activated bleaching
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DOI：
10.1016/j.jdent.2008.07.007
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发表时间：
2008-11-01
影响因子：
4.4
通讯作者：
Silva, Ricardo Gariba
中科院分区：
文献类型：
--
作者：
da Silva Pobbe, Priscila de Oliveira;Viapiana, Raqueli;Silva, Ricardo Gariba
目的：本研究的目的是评估的抗折性牙髓治疗牙齿提交漂白与38%过氧化氢激活发光二极管（LED）-laser system.Methods：50上颌切牙牙髓治疗，收到磷酸锌屏障，并嵌入到丙烯酸树脂，直到牙骨质-釉质交界处。根据漂白次数将样本分为5组（n = 10）：GI，无处理（对照）; GII，1次; GIII，2次; GIV，3次; GV，4次。将美白凝胶施加到牙齿的颊面和牙髓腔内部，每次三次，然后进行LED激光激活。结果：GI（0.71 +/- 0.30）和GII（0.65 +/- 0.13）之间没有显著差异（p > 0.05），这两种材料的断裂强度最高。组III（0.35 ± 0.17）、组IV（0.23 ± 0.13）和组V（0.38 ± 0.15）与GI和GII相比显示出较低的抗折力（p < 0.01）。结论：经LED激光系统激活的38%过氧化氢漂白两个疗程后，根管治疗牙齿的抗折力降低。(c)2008爱思唯尔有限公司保留所有权利。
Objectives: The aim of this study was to assess the fracture resistance of endodontically treated teeth submitted to bleaching with 38% hydrogen peroxide activated by light-emitting diode (LED)-laser system.Methods: Fifty maxillary incisors were endodontically treated, received a zinc phosphate barrier and were embedded in acrylic resin until cemento-enamel junction. The specimens were distributed into five groups (n = 10) according to the number of bleaching sessions: GI, no treatment (control); GII, one session; GIII, two sessions; GIV, three sessions and GV, four sessions. The whitening gel was applied to the buccal surface of the tooth and inside the pulp chamber for three times in each session, followed by LED-laser activation. Specimens were submitted to the fracture resistance test (kN) and data were submitted to the Tukey-Kramer multiple comparisons test.Results: No significant difference (p > 0.05) was found between GI (0.71 +/- 0.30) and GII (0.65 +/- 0.13), which presented the highest strength values to fracture. Groups III (0.35 +/- 0.17), IV (0.23 +/- 0.13) and V (0.38 +/- 0.15) showed lower resistance to fracture (p < 0.01) when compared to GI and GII.Conclusions: The fracture resistance of endodontically treated teeth decreased after two sessions of bleaching with 38% hydrogen peroxide activated by LED-laser system. (c) 2008 Elsevier Ltd. All rights reserved.