Study on optimal pulse width of ultra-short pulse Er : YAG laser for improving dentin adhesion
10.19405/j.cnki.issn1000-1492.2023.06.031
- Author:
Danjing Zhen
1
;
Rong Xia
1
;
Jiliang Xu
1
;
Zihuan Sun
1
;
Chun Liu
1
;
Jinlan Yu
1
Author Information
1. Dept of Stomatology，The Second Affiliated Hospital of Anhui Medical University，Hefei 230601
- Publication Type:Journal Article
- Keywords:
Er : YAG laser;
ultra-short pulse;
dentin bonding;
scanning electron microscopy
- From:
Acta Universitatis Medicinalis Anhui
2023;58(6):1056-1059,1063
- CountryChina
- Language:Chinese
-
Abstract:
Objective : To explore the optimal pulse width of ultra-short pulse Er : YAG laser for improving dentin bonding strength．
Methods : Forty isolated third molars were prepared in the shape of wedge defect in the neck，and the coronal plane was taken．The samples were randomly divided into 5 groups : group G0 was blank group，and groups G1-G4 were treated with 30 MJ，20 Hz Er : YAG laser，and the pulse width was set to 30，40，50 and 60 μs， respectively．The morphology of dentin surface was observed by scanning electron microscopy (SEM) ，and the ratio of calcium to phosphorus was detected by energy dispersive X-ray spectroscopy ( EDX) ．The shear bond strength ( SBS) of each group and the fracture form under the type microscope were tested by the universal mechanical tes- ting machine．The effect of different pulse width on improving dentin bonding strength was evaluated.
Results : SEM observation showed that the stained layer was removed after laser treatment with different pulse widths，and the den- tin tubules were opened to different degrees．The calcium-phosphorus ratio of dentin after laser treatment increased， and the difference of calcium-phosphorus ratio in G2 group was statistically significant (P＜0. 05) ．The mean value of SBS after the cold and hot cycle experiment was G2 ＞G3 ＞G1 ＞G4 ＞G0，and the difference between G2 group and G0 group，G1 group，G3 group and G4 group are statistically significant (P ＜0. 05 ) ．The difference between group G0 and groups G1，G2，G3 and G4 was statistically significant (P＜0. 05) ．The main fracture forms of each group were type 1 and type 3．
Conclusion :The 30 MJ，20 Hz Er : YAG laser pulse width of 40 μs can significantly improve the bond strength of dentin.
- Full text:2024101510242940727超短脉冲Er__YAG激光...粘结强度最佳脉冲宽度的研究_甄丹静.pdf
