Nd：YAG激光用于狗牙直接盖髓术的实验研究

目的：观察Ｎｄ：ＹＡＧ激光照射暴露牙髓后的盖髓术疗效。方法：用肉眼和组织学切片法。结果：１０７个狗牙露髓面用３个不同参数（１５９２ｍＪ／ｍｍ２、３１８５ｍＪ／ｍｍ２、４７７７ｍＪ／ｍｍ２）Ｎｄ：ＹＡＧ激光照射５ｓ后用氢氧化钙盖髓，与单纯氢氧化钙组比较，发现：低能量Ｎｄ：ＹＡＧ激光有刺激照射区和侧方修复性牙本质形成、促进创伤愈合作用，而高能量Ｎｄ：ＹＡＧ激光照射则可能引起牙髓变性坏死。结论：低能量Ｎｄ：ＹＡＧ激光有一定的促进创伤愈合作用，但在Ｎｄ：ＹＡＧ激光用于照射露髓面牙髓前，还应该对促进牙本质桥形成的Ｎｄ：ＹＡＧ激光照射条件进行更详细研究。

The effects of Nd:YAG laser irradiation on the wound healing of exposed pulp

Aim: To investigate the effects of Nd: YAG laser irradiation on the wound healing of exposed pulp. Methods: One hundred and seven mongrel dogs' teeth were used. The experimental teeth pulp were exposed and the surface of some exposed pulp was irradiated with Nd:YAG laser.Then they were dressed with calcium hydroxide and sealed with a glass ionomar cement.Non-irradiated pulp served as controls. The experimental animals were sacrificed on days 7, 28 and 84 after operation and the pulp tissue changes were histopathologically evaluated. Results:On day 7 after the operation,the wound healing of 10 pulse per second, output energy 100mJ irradiated pulp tended to be more facilitated than the control group. Conclusions: Lower energy output Nd:YAG laser irradiation activated the formation of secondary dentin not only on the surface of exposed pulp, but also on the opposite side to the cavity.