Jordão Maisa Camillo, Ionta Franciny Querobim, Bergantin Bianca Tozi Portaluppe, Mendonça Fernanda Lyrio, Santos Natália Mello Dos, Honório Heitor Marques, Oliveira Thais Marchini de, Rios Daniela
Universidade de São Paulo, Faculdade de Odontologia de Bauru, Departamento de Odontopediatria, Ortodontia e Saúde Coletiva, Bauru, São Paulo, Brasil.
J Appl Oral Sci. 2019 Jan 14;27:e20180153. doi: 10.1590/1678-7757-2018-0153.
The standardization of in situ protocols for dental erosion is important to enable comparison between studies.Thus, the objectives of this study were to evaluate the influence of the location of in situ intraoral appliance (mandibular X palatal) on the extent of enamel loss induced by erosive challenges and to evaluate the comfort of the appliances.
One hundred and sixty bovine enamel blocks were selected according to their initial surface hardness and randomly divided into two groups: GI - palatal appliance and GII - mandibular appliance. Twenty volunteers wore simultaneously one palatal appliance (containing 4 enamel blocks) and two mandibular appliances (each one containing 2 enamel blocks). Four times per day during 5 days, the volunteers immersed their appliances in 0.01 M hydrochloric acid for 2 minutes, washed and reinserted them into the oral cavity for 2 hours until the next erosive challenge. After the end of the in situ phase, the volunteers answered a questionnaire regarding the comfort of the appliances. The loss of tissue in the enamel blocks was determined profilometrically. Data were statistically analyzed by paired t-test, Chi-square and Fisher's Exact Test (p<0.05).
The enamel blocks allocated in palatal appliances (GI) presented significantly higher erosive wear when compared to the blocks fixed in mandibular appliances (GII). The volunteers reported more comfort when using the palatal appliance.
Therefore, the palatal appliance is more comfortable and resulted in higher enamel loss compared to the mandibular one.
牙侵蚀原位实验方案的标准化对于不同研究间的比较很重要。因此，本研究的目的是评估原位口腔内装置（下颌×腭部）的放置位置对侵蚀性刺激导致的牙釉质丧失程度的影响，并评估装置的舒适度。
根据初始表面硬度选择160个牛牙釉质块，并随机分为两组：GI组——腭部装置组和GII组——下颌装置组。20名志愿者同时佩戴一个腭部装置（包含4个牙釉质块）和两个下颌装置（每个包含2个牙釉质块）。在5天内，志愿者每天4次将装置浸入0.01 M盐酸中2分钟，冲洗后再插入口腔2小时，直至下一次侵蚀性刺激。原位阶段结束后，志愿者回答一份关于装置舒适度的问卷。通过轮廓仪测定牙釉质块中的组织损失。数据采用配对t检验、卡方检验和Fisher精确检验进行统计学分析（p<0.05）。
与固定在下颌装置（GII）中的牙釉质块相比，放置在腭部装置（GI）中的牙釉质块呈现出显著更高的侵蚀性磨损。志愿者在使用腭部装置时报告感觉更舒适。
因此，与下颌装置相比，腭部装置更舒适，导致的牙釉质损失更高。
