Energy output reduction and surface alteration of quartz and sapphire tips following Er:YAG laser contact irradiation for tooth enamel ablation

Background 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 irra...

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Published in:Lasers in surgery and medicine 2009-10, Vol.41 (8), p.595-604
Main Authors: Eguro, Toru, Aoki, Akira, Maeda, Toru, Takasaki, Aristeo Atsushi, Hasegawa, Mitsuru, Ogawa, Masaaki, Suzuki, Takanori, Yonemoto, Kazuaki, Ishikawa, Isao, Izumi, Yuichi, Katsuumi, Ichiroh
Format: Article
Language:English
Subjects:
Aluminum Oxide - radiation effects
contact tip
Dental enamel
Dental Enamel - radiation effects
Energy output
Energy Transfer - radiation effects
EPMA analysis
Er:YAG laser
Fractures
Humans
Laser Therapy - instrumentation
Lasers
Lasers, Solid-State
output energy
Quartz
Quartz - radiation effects
sapphire
Sound
Surface Properties - radiation effects
Teeth
Tissue Culture Techniques
Tooth Preparation - instrumentation
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Summary:Background 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. Materials and Methods 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/cm2/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. Results 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. Conclusion 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. © 2009 Wiley‐Liss, Inc.
ISSN:0196-8092
1096-9101
1096-9101
DOI:10.1002/lsm.20806