Meyer-Lueckel H, Paris S, Kielbassa A M
Department of Operative Dentistry and Periodontology, University School of Dental Medicine, Campus Benjamin Franklin, Charité--Universitatsmedizin Berlin, Berlin, Germany.
Caries Res. 2007;41(3):223-30. doi: 10.1159/000099323.
The infiltration of proximal enamel lesions with low-viscosity light curing resins could be a viable approach to stop lesion progression. However, penetration of sealant might be hampered by the comparatively highly mineralized surface layers of natural lesions. Therefore, the aim of this study was to compare the efficacy of three different etching gels in removing the surface layer in various etching times. Extracted human molars and premolars showing proximal white spot lesions were cut across the demineralized areas. Ninety-six lesions expected from visual examination to be confined to the outer enamel (C1) were selected. The cut surface and half of each lesion were varnished, thus serving as control. Subsequently, the lesions were etched with either phosphoric (37%) or hydrochloric (5 or 15%) acid gel for 30-120 s (n = 8/group). Specimens were examined using confocal microscopy and transversal microradiography. Surface layer reduction was significantly increased in lesions etched with 15% HCl gel for 90 and 120 s compared to those etched with H(3)PO(4) gel for 30-120 s (p < 0.05). No significant differences regarding the depths of erosion in the lesions compared to sound enamel could be observed (p > 0.05). An effective reduction in the surface layer of natural enamel caries can be achieved by etching with 15% hydrochloric acid gel for 90-120 s.
用低粘度光固化树脂浸润近端釉质病变可能是阻止病变进展的一种可行方法。然而，由于天然病变的表面层矿化程度相对较高，封闭剂的渗透可能会受到阻碍。因此，本研究的目的是比较三种不同蚀刻凝胶在不同蚀刻时间去除表面层的效果。将显示近端白斑病变的拔除人类磨牙和前磨牙沿脱矿区域切开。从视觉检查预计局限于外釉质（C1）的96个病变中进行选择。将切割面和每个病变的一半涂上清漆，作为对照。随后，用磷酸（37%）或盐酸（5%或15%）凝胶蚀刻病变30 - 120秒（每组n = 8）。使用共聚焦显微镜和横向显微放射照相术检查标本。与用磷酸凝胶蚀刻30 - 120秒的病变相比，用15%盐酸凝胶蚀刻90秒和120秒的病变表面层减少显著增加（p < 0.05）。与健康釉质相比，病变侵蚀深度没有观察到显著差异（p > 0.05）。用15%盐酸凝胶蚀刻90 - 120秒可有效减少天然釉质龋的表面层。
