Eguro Toru, Aoki Akira, Maeda Toru, Takasaki Aristeo Atsushi, Hasegawa Mitsuru, Ogawa Masaaki, Suzuki Takanori, Yonemoto Kazuaki, Ishikawa Isao, Izumi Yuichi, Katsuumi Ichiroh
Department of Endodontics and Operative Dentistry, School of Life Dentistry at Tokyo, Nippon Dental University, Tokyo, Japan.
Lasers Surg Med. 2009 Oct;41(8):595-604. doi: 10.1002/lsm.20806.
Despite the recent increase in application of Er:YAG laser for various dental treatments, limited information is available regarding the contact tips. This study examined the changes in energy output and surface condition of quartz and sapphire contact tips after Er:YAG laser contact irradiation for tooth enamel ablation.
Ten sets of unused quartz or sapphire contact tips were employed for contact irradiation to sound enamel of extracted teeth. The teeth were irradiated with Er:YAG laser at approximately 75 J/cm(2)/pulse and 20 Hz under water spray for 60 minutes. The energy output was measured before and every 5 minutes after irradiation, and the changes in morphology and chemical composition of the contact surface were analyzed.
The energy output significantly decreased with time in both tips. The energy output from the sapphire tips was generally higher on average than that of the quartz. The contact surfaces of all the used quartz tips were concave and irregular. Most of the sapphire tips also appeared rough with crater formation and fractures, except for a few tips in which a high energy output and the original smooth surface were maintained. Spots of melted tooth substances were seen attached to the surface of both tips.
In contact enamel ablation, the sapphire tip appeared to be more resistant than the quartz tip. The quartz tips showed similar patterns of energy reduction and surface alteration, whereas the sapphire tips revealed a wider and more characteristic variation among tips. Lasers Surg. Med. 41:595-604, 2009. (c) 2009 Wiley-Liss, Inc.
尽管近年来铒激光在各种牙科治疗中的应用有所增加，但关于接触式探头的信息却很有限。本研究检测了铒激光接触照射牙釉质消融后石英和蓝宝石接触式探头的能量输出及表面状况的变化。
使用十套未使用过的石英或蓝宝石接触式探头对拔除牙齿的健康牙釉质进行接触照射。在喷水条件下，用铒激光以约75 J/cm²/脉冲、20 Hz的参数对牙齿照射60分钟。在照射前及照射后每隔5分钟测量能量输出，并分析接触表面的形态和化学成分变化。
两种探头的能量输出均随时间显著下降。蓝宝石探头的平均能量输出总体上高于石英探头。所有使用过的石英探头的接触表面均呈凹形且不规则。除少数保持高能量输出和原始光滑表面的探头外，大多数蓝宝石探头也显得粗糙，有坑洼形成和裂缝。在两种探头表面均可见附着的熔化牙物质斑点。
在接触式牙釉质消融中，蓝宝石探头似乎比石英探头更耐用。石英探头显示出相似的能量降低和表面改变模式，而蓝宝石探头在不同探头之间表现出更广泛且更具特征性的变化。《激光外科与医学》41:595 - 604，2009年。(c) 2009威利 - 利斯公司。
