Er:YAG激光活化冲洗技术对根管内氢氧化钙清除效果和根尖封闭性能的影响

doi:10.13481/j.1671-587X.20220224

Abstract

Abstract: Objective

To explore the effects of two Er： YAG laser activation irrigation techniques on the removal of calcium hydroxide［Ca（OH）₂］ in the root canals and the apical sealing ability， and to clarify the clinical application value of this technique in root canal irrigation.

Methods

A total of 80 isolated single Ca（OH）₂ premolars were prepared to 35# after crown cut， and the root canals were filled with hydroxide paste. According to different irrigation techniques， all samples were randomly divided into 4 groups （n=20）：ultrasonically activated irrigation group， photon initiated photoacoustic streaming（PIPS） group， shock wave enhanced emission photoacoustic streaming（SWEEPS） group， and negative control group. First， 10 samples of each group were randomly selected for longitudinal sections， then they were observed with scanning electron microscepe（SEM） and scored. Secondly， the remaining samples of each group were subjected to root canal filling and dye penetration experiments. The effects of different irrigation techniques on the removal Ca（OH）₂ were compared， and the dye penetration lengthes in various groups were analyzed.

Results

The three experimental groups were unable to completely remove Ca（OH）₂ in the root canal； compared with cervical third and middle third， the residual Ca（OH）₂ score in the apical third was significantly increased （P<0.05）.Compared with ultrasonically activated irrigation group， the residual Ca（OH）₂ scores in PIPS group and SWEEPS group were increased in the cervical third（P<0.05）. While in the middle third， compared with ultrasonically activated irrigation group，the residual Ca（OH）₂ score in_{SWEEPS group was increased （P<0.05）. The apical third did not show significant differences among experimental groups（P>0.05）. There were no significant differences between PIPS and SWEEPS in the residual Ca（OH）₂ scores in the cervical， middle and apical thirds（P>0.05）. There was no significant difference in the dye penetration length among various groups （P>0.05）.}

Conclusion

PIPS and SWEEPS techniques have the similar ability to remove Ca（OH）₂， and compared with ultrasonically actirated irrigation， the removal effects of Ca（OH）₂ in the middle and upper part of the root canal are better， and after the three irrigation techniques are applied， the residual Ca（OH）₂ hardly affect the apical sealing ability of the root canal filling material in the short term.

Key words: Calcium hydroxide, Er∶YAG laser, Ultrasonically activated irrigation, Root canal irrigation

CLC Number:

R781.3

Ang MA,Yingyi WANG,Mengyao SUN,Shan JIAO,Xiuping MENG,Chengkun WANG. Effect of Er:YAG laser activation irrigation technique on removal effect of calcium hydroxide in root canals and apical sealing ability[J].Journal of Jilin University(Medicine Edition), 2022, 48(2): 462-469.

Figures/Tables 3

References 27

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Group	Residual Ca(OH)₂score
Group	Cervical third	Middle third	Apical third	Total
Ultrasonically activated irrigation	3.00±0.67	3.30±0.82	4.30±0.82^*△	3.53±0.94
PIPS	2.00±0.67^#	2.70±0.82	4.30±0.82^*△	3.00±1.23
SWEEPS	2.10±0.74^#	2.30±0.82^#	3.80±0.79^*△	2.73±1.03
Negative control	1.00±0.00	1.00±0.00	1.00±0.00	1.00±0.00

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Effect of Er:YAG laser activation irrigation technique on removal effect of calcium hydroxide in root canals and apical sealing ability

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