Influence of dental chair backrest inclination on the registration of the mandibular position
Influence of dental chair backrest inclination on the registration of the mandibular position
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DOI：
10.1016/j.prosdent.2015.05.013
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发表时间：
2015-11-01
影响因子：
4.6
通讯作者：
Rode, Sigmar de Mello
中科院分区：
文献类型：
--
作者：
Coelho, Mariana Freire;Cavalcanti, Bruno das Neves;Rode, Sigmar de Mello
陈述问题。改变牙椅靠背的倾斜度可能会改变咬合接触点的分布。本研究的目的是确定靠背倾斜度对下颌位置记录的影响。材料和方法。选择10名年龄在18至30岁之间的参与者，他们具有完整的恒牙列，未受损的运动功能，没有牙齿移动，没有颞下颌关节紊乱病。为了记录咬合面接触，自聚合甲基丙烯酸甲酯装置适用于上颌前牙，复合树脂增量添加到下颌中切牙。接触记录在牙科椅靠背倾斜度的以下变化中：90度、120度和180度。对每个靠背位置的每个标记进行标准化数码照片，并将图像叠加以测量90至120度和90至180度的配准距离。采用Student配对t检验（α = 0.05）分析数据。当椅子从90度倾斜到120度时，下颌骨平均向后复位0.67 mm，但差异无统计学意义。然而，当椅子从90度倾斜到180度位置时，下颌骨向后重新定位，平均值为1.41 mm，具有统计学意义。下颌位置受倾斜度增加的影响，并且在180度倾斜时这种影响具有统计学显著性。
Statement of problem. Varying the inclination of the dental chair backrest might alter the distribution of occlusal contact points.Purpose. The purpose of this study was to identify the influence of backrest inclination on the registration of the mandibular position.Material and methods. Ten participants aged between 18 and 30 years with a complete permanent dentition, uncompromised motor function, no tooth mobility, and no temporomandibular disorders were selected. To register interocclusal contacts, an autopolymerizing methylmethacrylate device was adapted to the maxillary anterior teeth and a composite resin increment was added to the mandibular central incisors. Contacts were registered with the following variations in the inclination of the dental chair backrest: 90 degrees, 120 degrees, and 180 degrees. A standardized digital photograph was made of each mark in each backrest position, and the images were superimposed to measure the distances in registration from 90 to 120 and from 90 to 180 degrees. Data were analyzed with the Student paired t test (alpha=.05).Results. When the chair was inclined from the 90-degree to the 120-degree position, the mandible was repositioned posteriorly by a mean of 0.67 mm, but the difference was not statistically significant. When the chair was inclined from the 90-degree to the 180-degree position, however, the mandible was repositioned posteriorly by a statistically significant mean of 1.41 mm.Conclusions. Mandibular position is influenced by increasing inclination, and this influence was statistically significant at a 180-degree incline.