Scatolin R S, Colucci V, Lepri T P, Alexandria A K, Maia L C, Galo R, Borsatto M C, Corona S A M
Department of Restorative Dentistry, Dental School of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, Brazil,
Lasers Med Sci. 2015 Jul;30(5):1465-73. doi: 10.1007/s10103-014-1620-6. Epub 2014 Jul 2.
This in situ study evaluated the effect of Er:YAG laser irradiation in controlling the progression of enamel erosion-like lesions. Fifty-six enamel slabs (330 KHN ± 10 %) with one fourth of the surface covered with resin composite (control area) were submitted to initial erosion-like lesion formation with citric acid. The slabs were divided into two groups: irradiated with Er:YAG laser and non-irradiated. Fourteen volunteers used an intraoral palatal appliance containing two slabs, in two phases of 5 days each. During the intraoral phase, in a crossed-over design, half of the volunteers immersed the appliance in citric acid while the other half used deionized water, both for 5 min, three times per day. Enamel wear was determined by an optical 3D profilometer. ANOVA revealed that when deionized water was used as immersion solution during the intraoral phase, lower values of wear were showed when compared with the groups that were eroded with citric acid, whether irradiated or non-irradiated with Er:YAG laser. When erosion with citric acid was performed, Er:YAG laser was not able to reduce enamel wear. Small changes on enamel surface were observed when it was irradiated with Er:YAG laser. It may be concluded that Er:YAG laser irradiation did not reduce the progression of erosive lesions on enamel submitted to in situ erosion with citric acid.
这项原位研究评估了铒钇铝石榴石（Er:YAG）激光照射对控制牙釉质侵蚀样病变进展的效果。选用56块努氏硬度为330±10%的牙釉质板，其四分之一表面覆盖树脂复合材料（对照区域），用柠檬酸使其形成初始侵蚀样病变。将这些牙釉质板分为两组：接受Er:YAG激光照射组和未照射组。14名志愿者使用一种口内腭部装置，其中包含两块牙釉质板，分两个阶段，每个阶段5天。在口内阶段，采用交叉设计，一半志愿者将装置浸泡在柠檬酸中，另一半使用去离子水，均浸泡5分钟，每天3次。通过光学三维轮廓仪测定牙釉质磨损情况。方差分析显示，在口内阶段使用去离子水作为浸泡溶液时，与用柠檬酸侵蚀的组相比，无论是否接受Er:YAG激光照射，磨损值都较低。当用柠檬酸进行侵蚀时，Er:YAG激光无法减少牙釉质磨损。在用Er:YAG激光照射牙釉质表面时，观察到了微小变化。可以得出结论，Er:YAG激光照射并不能减少因柠檬酸原位侵蚀导致的牙釉质侵蚀性病变的进展。
