Apel C, Meister J, Schmitt N, Gräber H-G, Gutknecht N
Department of Conservative Dentistry, Periodontology and Preventive Dentistry, University of Aachen, Germany.
Lasers Surg Med. 2002;30(5):337-41. doi: 10.1002/lsm.10058.
The objective of the present study was to investigate the effect of sub-ablative Er:YAG (lambda = 2.94 microm) and Er:YSGG (lambda = 2.79 microm) laser radiation on the acid solubility of dental enamel. The influence of fluoride application prior to laser irradiation was additionally evaluated.
STUDY DESIGN/MATERIALS AND METHODS: To this end, 294 enamel specimens were prepared from bovine teeth and divided into 14 groups of 21 specimens each. The enamel samples were irradiated in their groups with the Er:YAG and the Er:YSGG laser, using energy densities of 4, 6, and 8 J/cm(2) in each case. Irradiation was additionally repeated in the same way on specimens, which had previously been immersed in 1% sodium fluoride solution for 15 minutes. One group was left untreated and served as a control group. A further group was not irradiated, but only immersed in the 1% fluoride solution for 15 minutes. The enamel specimens were demineralised for 24 hours in an acetate buffer solution. The calcium content in the demineralisation solution was subsequently determined with the aid of atomic absorption spectrometry.
The results indicate a decline in calcium solubility after laser irradiation. Compared to the control group, a 20% lower calcium content was detected in the demineralisation solution after irradiation with the Er:YSGG laser at 8 J/cm(2). The difference between the laser-irradiated groups and the untreated control group was, however, not statistically significant. A significantly lower calcium content was found in the demineralisation solution after fluoridation of the specimens. Additional laser radiation had no further effect on this result.
In summary, it can be stated that, although the erbium laser wavelengths apparently have the potential to increase acid resistance, their application solely for caries prevention would not appear to be sensible under the prevailing conditions.
本研究的目的是调查非消融性铒：钇铝石榴石（波长 = 2.94微米）和铒：钇钪镓石榴石（波长 = 2.79微米）激光辐射对牙釉质酸溶解性的影响。此外，还评估了激光照射前应用氟化物的影响。
研究设计/材料与方法：为此，从牛牙制备了294个牙釉质标本，并分为14组，每组21个标本。牙釉质样本在各自的组中用铒：钇铝石榴石和铒：钇钪镓石榴石激光进行照射，每种情况下的能量密度分别为4、6和8 J/cm²。对于先前已浸入1%氟化钠溶液中15分钟的标本，以同样的方式再次进行照射。一组不进行处理作为对照组。另一组不进行照射，仅浸入1%氟化物溶液中15分钟。牙釉质标本在醋酸盐缓冲溶液中脱矿24小时。随后借助原子吸收光谱法测定脱矿溶液中的钙含量。
结果表明激光照射后钙溶解度下降。与对照组相比，用铒：钇钪镓石榴石激光以8 J/cm²照射后，脱矿溶液中的钙含量检测到低20%。然而，激光照射组与未处理的对照组之间的差异无统计学意义。标本氟化后，脱矿溶液中的钙含量显著降低。额外的激光辐射对此结果没有进一步影响。
总之，可以说，尽管铒激光波长显然有增加抗酸性的潜力，但在当前条件下，仅将其用于预防龋齿似乎并不明智。
