Department of Restorative, Preventive and Pediatric Dentistry, School of Dental Medicine, University of Bern, Freiburgstrasse 7, 3010, Bern, Switzerland.
Department of Operative Dentistry and Periodontology, Center for Dental Medicine, Medical Center - University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany.
Sci Rep. 2022 Mar 9;12(1):4153. doi: 10.1038/s41598-022-08116-0.
Controversial results showing that deciduous teeth are more susceptible to erosion than permanent teeth might be related to study designs. We investigated how different conditions (pH: 3.0, 4.0, 5.0; acid agitation: gentle or vigorous; acid exposure times: 1-5 min) affect the susceptibility of both teeth to erosion. Enamel specimens (90 deciduous, 90 permanent) were distributed into groups (n = 15 permanent, n = 15 deciduous) according to acid pH (pH 5, 4 or 3) and agitation (gentle or vigorous) during erosive challenge. Both milder (less incubation time, gentle agitation, and higher pH) and more severe (longer incubation times, vigorous shaking, and lower pH) conditions were used. Demineralization was measured by relative surface microhardness (rSMH) and calcium released to the acid. Demineralization increased gradually for both teeth with increasing incubation time, agitation (gentle or vigorous), and with decreasing acid pH. The differences between deciduous and permanent teeth depended on the protocol design and assessment method. Under milder conditions, demineralization was better detectable with rSMH. Under more severe conditions, differences were more perceptible with calcium analyses. Differences exist in the susceptibility to erosion between deciduous and permanent teeth, but they are only distinguishable when the appropriate assessment method is used for the specific erosive condition.
争议性的结果表明，乳牙比恒牙更容易受到酸蚀的影响，这可能与研究设计有关。我们研究了不同条件（pH 值：3.0、4.0、5.0；酸搅拌：温和或剧烈；酸暴露时间：1-5 分钟）如何影响两种牙齿的酸蚀敏感性。将牙釉质标本（90 颗乳牙，90 颗恒牙）根据酸蚀挑战过程中的酸 pH 值（pH 值 5、4 或 3）和搅拌（温和或剧烈）分配到不同的组（n=15 颗恒牙，n=15 颗乳牙）。使用了更温和的（较短的孵育时间、温和的搅拌和较高的 pH 值）和更严重的（较长的孵育时间、剧烈的晃动和较低的 pH 值）条件。通过相对表面显微硬度（rSMH）和释放到酸中的钙来测量脱矿质。随着孵育时间、搅拌（温和或剧烈）的增加以及酸 pH 值的降低，两种牙齿的脱矿质逐渐增加。乳牙和恒牙之间的差异取决于方案设计和评估方法。在较温和的条件下，rSMH 更能检测到脱矿质。在更严重的条件下，使用钙分析时差异更明显。乳牙和恒牙之间存在酸蚀敏感性的差异，但只有在使用特定的酸蚀条件下的适当评估方法时才能区分这些差异。
