Objective:To analyze the effect of Er:YAG laser on the microstructure of all-ceramic onlay and tooth tissue by simulating the debonding process of clinical all-ceramic onlay after bonding and analyzing the effect of Er:YAG laser on the microstructure of all-ceramic onlay.Methods:After fresh extraction of orthodontic premolars,three kinds of onlays of different materials(IPS E.Max Press,Lava Esthetic,porcelain)and different thicknesses(1 mm,1.5 mm,2 mm)are made for adhesion after tooth preparation.After storing for one week,Er:YAG laser(3 W,4 W)was used to irradiate the all-ceramic onlays and the time was recorded.Scanning electron microscope(SEM)was used to observe the microstructure of the debonded teeth and the onlaid surfaces.Results:The debonding time of 3 W power:the 1 mm Lava Esthetic group(196±16)s is greater than the 1 mm IPS e.Max Press group(184±20)s(P＜0.05).The 1.5 mm Lava Esthetic group(354±8)s was greater than the 1.5 mm IPS e.Max Press group(270±14)s(P＜0.05).The debonding time of the onlays with two thicknesses(1 mm,1.5 mm)decreased under 4 W of power.The onlay with a thickness of 2 mm could not debond under the two powerlevels.The ceramic onlay could not be removed after irradiation for a long time with different levels of power(＞20 min,3 W\4 W).Conclusion:When the material and power are the same,the thicker the ceramic block is,the longer the dismantling time and the higher the dismantling power are.When the material and thickness are the same,the more erbium laser power is,the shorter the debonding time is.When the thickness and power are the same,the laser irradiating through the porcelain block may have an effect on the porcelain block itself.Erbium laser could not dismantle the embellized ceramic onlay at this experimental power.
关键词
Er:YAG激光/高嵌体/去粘接/拆冠/树脂基陶瓷/玻璃陶瓷/高透氧化锆/扫描电镜
Key words
Er:YAG laser/onlay/debonding/crown removal/resin-based ceramics/glass ceramic/high permeability zirconia/scanning electron microscope
维普
万方数据