Apel C, Birker L, Meister J, Weiss C, Gutknecht N
Department of Conservative Dentistry, Periodontology and Preventive Dentistry, Aachen University, Pauwelsstrasse 30, D-52074 Aachen, Germany.
Photomed Laser Surg. 2004 Aug;22(4):312-7. doi: 10.1089/pho.2004.22.312.
The aim of the present study was to investigate the effect of sub-ablative Er:YAG and Er:YSGG laser radiation on the demineralization of human dental enamel in situ.
Eighteen enamel specimens were prepared to this end, nine of which were irradiated at 8 J/cm(2) with the Er:YSGG laser and nine at 6 J/cm(2) with the Er:YAG laser (125 pulses per surface). Each test surface was assigned a control surface on the same specimen. Three healthy volunteers from each group subsequently wore three enamel specimens in situ for a period of 1 week. The demineralization was assessed by determining the surface microhardness according to Knoop (KH) before and after wearing.
Before wearing, the mean surface hardness measured on the control surfaces was 233 (SD 99) KH (CYSGG) and 162 (SD 59) KH (CYAG). After sub-ablative laser irradiation, the surface hardness values measured were already found to be lower compared to the untreated control surfaces (YSGG: 195 [SD 110] KH/YAG: 112 [SD 72] KH). Marked demineralization was observed on the control surfaces after 1 week of wearing in situ (CYSGG*: 60 [SD 57] KH; CYAG*: 53 [SD 9] KH). After wearing, the hardness on the irradiated test surfaces was ErYSGG*: 133 [SD 58] KH and ErYAG*: 89 [SD 28] KH, and was thus higher than on the control surfaces.
The results indicate a tendency towards increased caries resistance following sub-ablative erbium laser irradiation. However, in an analysis of variance model with repeated measures, the tendency in this study failed to reach statistical significance (alpha = 0.05).
本研究旨在调查非消融性铒：钇铝石榴石（Er:YAG）激光和铒：钇钪镓石榴石（Er:YSGG）激光辐射对人牙釉质原位脱矿的影响。
为此制备了18个牙釉质标本，其中9个用Er:YSGG激光以8 J/cm²照射，9个用Er:YAG激光以6 J/cm²照射（每个表面125个脉冲）。每个测试表面在同一样本上指定一个对照表面。随后，每组三名健康志愿者在原位佩戴三个牙釉质标本，为期1周。通过根据努氏硬度（KH）在佩戴前后测定表面显微硬度来评估脱矿情况。
佩戴前，对照表面测得的平均表面硬度为233（标准差99）KH（CYSGG）和162（标准差59）KH（CYAG）。在非消融性激光照射后，与未处理的对照表面相比，测得的表面硬度值已经较低（YSGG：195 [标准差110] KH/YAG：112 [标准差72] KH）。在原位佩戴1周后，对照表面观察到明显脱矿（CYSGG*：60 [标准差57] KH；CYAG*：53 [标准差9] KH）。佩戴后，照射测试表面的硬度为ErYSGG*：133 [标准差58] KH和ErYAG*：89 [标准差28] KH，因此高于对照表面。
结果表明非消融性铒激光照射后有抗龋性增加的趋势。然而，在重复测量的方差分析模型中，本研究中的这一趋势未达到统计学显著性（α = 0.05）。
