Arcoria C J, Steele R E, Wagner M J, Judy M M, Matthews J L, Hults D F
Department of Operative Dentistry, Baylor College of Dentistry, Dallas, Texas.
J Dent. 1991 Apr;19(2):85-91. doi: 10.1016/0300-5712(91)90095-g.
The purpose of this study was to evaluate the effect of a coaxial carbon dioxide/neodymium:yttrium aluminium garnet laser beam on enamel surface roughness and the dental pulps of mongrel dogs. In four dogs, four maxillary left posterior teeth were irradiated at 16 cm source-tooth distances. Two teeth were irradiated with 16 W CO2/16 W Nd:YAG and the remaining two with 16 W CO2/40 W Nd:YAG. Two maxillary right teeth were untreated controls. In addition, mandibular premolars were irradiated at the same distance and power levels, extracted, and analysed for surface roughness. Significant differences in surface roughness were found between control samples and either power level, but not between enamel surfaces at the two power levels. Maxillary teeth were removed at 10 days postoperatively, sectioned and stained (H & E). The reaction of pulpal cells to irradiation was scored. Data analysis revealed statistically significant differences between the control and lower power Nd:YAG groups and between the control and higher power Nd:YAG groups. The difference in pulpal response between both laser groups approached significance.
本研究的目的是评估同轴二氧化碳/钕：钇铝石榴石激光束对杂种犬牙釉质表面粗糙度和牙髓的影响。在四只犬中，对上颌左侧四颗后牙在距离光源16厘米处进行照射。两颗牙齿用16瓦二氧化碳/16瓦钕：钇铝石榴石激光照射，其余两颗用16瓦二氧化碳/40瓦钕：钇铝石榴石激光照射。上颌右侧两颗牙齿作为未处理的对照。此外，下颌前磨牙在相同距离和功率水平下进行照射，然后拔除并分析表面粗糙度。对照样本与任一功率水平之间的表面粗糙度存在显著差异，但两种功率水平下的牙釉质表面之间没有差异。上颌牙齿在术后10天拔除，切片并染色（苏木精和伊红染色）。对牙髓细胞对照射的反应进行评分。数据分析显示，对照组与低功率钕：钇铝石榴石激光组之间以及对照组与高功率钕：钇铝石榴石激光组之间存在统计学上的显著差异。两个激光组之间牙髓反应的差异接近显著水平。
