Comparison of Er∶YAG Laser,Resin Infiltrating,and Micro-grinding in Treatment of Enamel Demineralization
Objective:To compare and analyze the effects of Er∶YAG laser,resin infiltration,and micro-grinding on tooth enamel demineralization.Methods:Forty-eight clinically extracted fresh premolars were collected and ran-domly divided into four groups after establishing artificial demineralization model.Group A was control group.Group B was micro-grinding group.Group C was permeable resin group.And group D was laser group.After 21 days,the four groups of isolated teeth were subjected to secondary demineralization.The microhardness and rough-ness of enamel surface was measured before treatment(t0),after demineralization(t1),after treatment(t2),and after secondary demineralization(t3).The treatment effect and surface structure of samples were observed by naked eyes and scanning electron microscope.Results:(1)At to and t1,there was no significant difference in enamel mi-crohardness among four groups(P＞0.05).At t2 and t3,the microhardness of group C was the largest,followed by group D and group B,and group A was the smallest.Except for group C and group D,there were significant differences among other groups(P＜0.01).At t3,the microhardness of group A was lower than that at t1(P＜0.01),while those of groups B,C,and D were higher than that at t1(P＜0.01).(2)There was no significant difference in enamel surface roughness between groups at t0 and t1(P＞0.05).At t2 and t3,the roughness value of group C was the smallest,followed by group D and group B,and group A was the largest.There were significant differ-ences among all groups(P＜0.01).(3)Only the color of group C was basically normal observed by naked eye.(4)SEM observation showed that the surface voids of enamel in groups B,C,and D were significantly reduced com-pared with that in group A,and the smoothness was also improved.Conclusion:Resin infiltrated is superior to laser irradiation in improving the surface roughness of demineralized enamel,and obviously better than micro-grinding in improving the microhardness and anti-demineralization stability.
demineralization of enamelresin infiltrationmicro-grindinglaser
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