Hobson R S, McCabe J F
Newcastle Dental School, Newcastle upon Tyne, England.
Br Dent J. 2002 Apr 27;192(8):463-8. doi: 10.1038/sj.bdj.4801401.
The aim of the study was to investigate the relationship between etch patterns produced on surface enamel by phosphoric acid and the corresponding bond strengths achieved.
Twenty-eight patients had the buccal surface of their teeth etched and replicated for examination under the scanning electron microscope, at the commencement of orthodontic treatment. Histometry was employed to assess the nature and quality of etch patterns using a four-point scale. Twenty of each tooth type (total of 240), were collected and A Company pre-adjusted orthodontic brackets, bonded using Transbond light-cured orthodontic adhesive according to the manufacturer's instructions and 24-hour bond strength testing was undertaken. The Adhesive Remnant Index (ARI) was recorded for the tooth and bracket surface for all specimens.
The type of etch was not significantly affected by the side (left or right) of the mouth assessed (p = 0.532). Overall, there was no significant difference between etch types for upper and lower teeth (p = 0.218); however, there were significant differences between specific teeth in the upper and lower arch. The greatest amount of Type A etch (well-defined etched enamel prisms) was found on the lower incisors, yet in all cases this 'ideal' etch was found to occupy less than 5% of the etched buccal surface enamel. The greatest area of etched enamel surface was occupied by Type C (etched but enamel prisms not evident). The mean bond strength values varied significantly between different tooth types, with the lowest bond strength found on the upper first molar(6.5MPa) and the highest on the lower first molar (13.1 MPa).
An ideal etch pattern is not essential in order to produce a strong bond.
本研究旨在调查磷酸对釉质表面产生的酸蚀模式与相应的粘结强度之间的关系。
28例患者在正畸治疗开始时，对其牙齿的颊面进行酸蚀并复制，以便在扫描电子显微镜下检查。采用组织测量法，使用四点量表评估酸蚀模式的性质和质量。每种牙齿类型收集20颗（共240颗），使用A公司预调整的正畸托槽，按照制造商的说明，用Transbond光固化正畸粘合剂粘结，并进行24小时粘结强度测试。记录所有标本牙齿和托槽表面的粘结剂残留指数（ARI）。
评估的口腔侧（左侧或右侧）对酸蚀类型没有显著影响（p = 0.532）。总体而言，上下牙齿的酸蚀类型之间没有显著差异（p = 0.218）；然而，上下牙弓中的特定牙齿之间存在显著差异。在下切牙上发现的A型酸蚀（蚀刻清晰的釉柱）量最大，但在所有情况下，这种“理想”酸蚀在蚀刻的颊面釉质中所占比例不到5%。蚀刻釉质表面面积最大的是C型（蚀刻但釉柱不明显）。不同牙齿类型的平均粘结强度值差异显著，上颌第一磨牙的粘结强度最低（6.5MPa），下颌第一磨牙的粘结强度最高（13.1MPa）。
为了获得较强的粘结力，理想的酸蚀模式并非必不可少。
