目的:本研究的目的是研究不同牙组的解剖特征与过氧化氢(H2O2)的扩散和漂白作用之间的关系。
方法:使用来自五名患者的计算机断层扫描(CT)图像来评估四个牙齿组的硬组织厚度和牙髓体积(PV):下(下颌)切牙(LI),上颌切牙(UI),犬科动物(C),和前磨牙(PM)。此外,将80个牛齿盘分成四组(n=20)以匹配所研究的每个牙齿组的厚度。所有样品都暴露于35%H2O2漂白凝胶中,在第一次期间施加50微升45分钟,第二,和第三次会议。使用过氧化物酶酶法评估扩散。颜色变化分析(ΔE,ΔE00和ΔWID)在三个施用阶段后和漂白处理后7天使用分光光度计进行。
结果:PM组显示更大的厚度和PV,其次是C,UI,和LI组(P<0.001)。与PM组相比,LI组的H2O2扩散增加了6倍(P0.001),而PM组的PV比LI组大9倍。此外,LI和UI组比C和PM组少一个会话实现了色彩饱和度。
结论:特定牙齿组具有解剖学特征,在H2O2的扩散和增白作用方面会干扰漂白治疗。此外,H2O2的扩散能力与牙组厚度成反比。
The objective of the present study was to investigate the association between the anatomical characteristics of different tooth groups and the diffusion and bleaching effect of hydrogen peroxide (H2O2).
Computed tomography (CT) images from five patients were used to assess the hard tissue thickness and pulp volume (PV) of four tooth groups: lower (mandibular) incisors (LI), upper (maxillary) incisors (UI), canines (C), and premolars (PM). Additionally, 80 bovine tooth disks were divided into four groups (n = 20) to match the thickness of each tooth group studied. All the specimens were exposed to a 35% H2O2 bleaching gel, with 50 µL applied for 45 min during the first, second, and third sessions. Diffusion was evaluated using the peroxidase enzyme method. Color change analyses (∆E, ∆E00, and ∆WID) were performed after the three application sessions and 7 days after the bleaching treatment using a spectrophotometer.
The PM group showed greater thickness and PV, followed by the C, UI, and LI groups (P 0.001). The LI group had six times greater H2O2 diffusion compared with the PM group (P 0.001), while the PM group exhibited a PV nine times larger than the LI group. Furthermore, the LI and UI groups achieved color saturation with one fewer session than the C and PM groups.
Specific tooth groups have anatomical characteristics that interfere with bleaching treatment in terms of the diffusion and whitening effect of H2O2. Furthermore, the diffusion capacity of H2O2 was inversely proportional to the thickness of the tooth groups.