Int J Stomatol

Int J Stomatol ›› 2022, Vol. 49 ›› Issue (1): 55-59.doi: 10.7518/gjkq.2022004

• Orginal Article • Previous Articles     Next Articles

Effect of photon-initiated photoacoustic streaming Er: YAG laser on the water loss of dentin and compressive strength of root

Zhang Shan(),Shen Shuping,Zhang Fang,Yang Weidong()   

  1. Dept. of Cariology and Endodontics, Nanjing Stomatological Hospital, Medical School of Nanjing University, Nanjing 210008, China
  • Received:2021-02-06 Revised:2021-07-21 Online:2022-01-01 Published:2022-01-07
  • Contact: Weidong Yang E-mail:15850772009@163.com;ywdong2001@163.com
  • Supported by:
    This study was supported by Key Research and Development Plan (Social Development) Projects in Jiangsu Province(BE2016623)

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Abstract: Objective This work aims to investigate the effects of photon-activated photoacoustic flow (PIPS) Er: YAG laser on root compressive strength and the water loss of the root canal wall dentin.Methods A total of 120 healthy orthodontic subtraction teeth extracted from the Department of Oral and Maxillofacial Surgery from July 2018 to September 2018 were randomly assigned into the following four groups using the random number table method: group A (PIPS Er:YAG laser washing group), group B (syringe washing group), group C (ultrasonic wave washing group), and group D (control group, untreated). Differences in the water content of root canal wall dentin and compressive strength of root before and after treatment were observed.Results The water content of the dentin of upper, middle, and lower root canals increased in all groups, but no significant difference was observed (P>0.05). In the upper segment of root canal wall, the water content of groups A and C was lower than that of groups B and D (P<0.05). In particular, that of group A was lower than that of group C (P>0.05), and that of group B was lower than that of group D (P<0.05). In the middle segment of the root canal wall, the water content of group A was lower than that of groups B, C, and D (P<0.05). In particular, that of group A was lower than that of group C (P>0.05), and that of group B was lower than that of group D (P<0.05). In the lower segment of root canal wall, the water content of group A was lower than that of groups B, C, and D (P<0.05). In particular, that of group A was slightly lower than that of group C (P>0.05), and that of group B was lower than that of group D (P<0.05). All groups had no significant difference in compressive strength (P>0.05).Conclusion Er: YAG laser PIPS technology can remarkably reduce the water content of dentin in the root canal wall but not the compressive strength of the root. Hence, this method has a good clinical application prospect.

Key words: Er: YAG laser, photon-activated photoacoustic flow, dentin of root canal wall, compressive strength


TrendMD: 

Fig 1

Root canal moisture meter"

Fig 2

The anti-compression experiment samples"

Fig 3

The anti-compression experiment"

Tab 1

Comparison of dentine water content in the up-per, middle and lower sections of root canal in four groups"

组别 n 上段 中段 下段
A 30 0.256±0.022 0.271±0.020 0.290±0.008
B 30 0.361±0.037 0.434±0.023 0.510±0.042
C 30 0.272±0.031 0.291±0.034 0.323±0.034
D 30 0.423±0.058 1.012±0.041 1.124±0.046
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