Sadowsky P L, Retief D H, Cox P R, Hernández-Orsini R, Rape W G, Bradley E L
Department of Orthodontics, School of Dentistry, University of Alabama, Birmingham.
Am J Orthod Dentofacial Orthop. 1990 Nov;98(5):417-21. doi: 10.1016/S0889-5406(05)81650-6.
Etching of enamel before the bonding of orthodontic attachments is usually done with a solution of 37% H3PO4 for 60 seconds. The purpose of this study was to evaluate the effects of etchant concentration and duration on the clinical retention of bonded orthodontic attachments. Two randomly selected groups of orthodontic patients participated in the study. In both groups, teeth in contralateral quadrants, excluding the molar teeth, were bonded. In the first group, 158 teeth were etched with a solution of 37% H3PO4 for 60 seconds, and 155 teeth were etched with 37% H3PO4 for 15 seconds. In the second group, 196 teeth were etched with 37% H3PO4 and 196 teeth with 15% H3PO4, both for 60 seconds. Conventional edgewise mechanotherapy was used in both groups of patients. After 24 months of treatment, in the first group, 8 brackets were dislodged when etched with 37% H3PO4 for 60 seconds and 9 when etched with 37% H3PO4 for 15 seconds. In the second group, 6 brackets were dislodged when etched with 37% H3PO4 for 60 seconds and 13 were dislodged when etched with 15% H3PO4 for 60 seconds. Reducing the etching time of 37% H3PO4 from 60 seconds to 15 seconds or reducing the acid concentration from 37% to 15% H3PO4 applied for 60 seconds had no significantly different effect on the retention of bonded orthodontic attachments. The results suggest that the reduction of etchant concentration and the duration of etching in orthodontic bonding should be considered.
在粘结正畸附件之前对牙釉质进行酸蚀通常使用37%的H3PO4溶液处理60秒。本研究的目的是评估酸蚀剂浓度和时间对粘结正畸附件临床固位的影响。两组随机选取的正畸患者参与了本研究。在两组中，对侧象限中除磨牙外的牙齿进行粘结。在第一组中，158颗牙齿用37%的H3PO4溶液酸蚀60秒，155颗牙齿用37%的H3PO4酸蚀15秒。在第二组中，196颗牙齿用37%的H3PO4酸蚀，196颗牙齿用15%的H3PO4酸蚀，均酸蚀60秒。两组患者均采用传统方丝弓矫治技术。治疗24个月后，在第一组中，用37%的H3PO4酸蚀60秒时有8个托槽脱落，用37%的H3PO4酸蚀15秒时有9个托槽脱落。在第二组中，用37%的H3PO4酸蚀60秒时有6个托槽脱落，用15%的H3PO4酸蚀60秒时有13个托槽脱落。将37%的H3PO4酸蚀时间从60秒减少到15秒，或者将酸浓度从37%降低到15%并酸蚀60秒，对粘结正畸附件的固位没有显著差异。结果表明，在正畸粘结中应考虑降低酸蚀剂浓度和酸蚀时间。
