Journal of Hebei Medical University ›› 2023, Vol. 44 ›› Issue (3): 324-328,337.doi: 10.3969/j.issn.1007-3205.2023.03.016

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Effect of Er：YAG laser by photon-initiated photoacoustic streaming on penetration of root filling paste into dentinal tubules of primary teeth in vitro

  

  1. Department of Pediatric Dentistry, Hebei Key Laboratory of Stomatology， Hebei Clinical Research 
    Center for Oral Diseases, School and Hospital of Stomatology, 
    Hebei Medical University，Shijiazhuang 050017, China
  • Online:2023-03-25 Published:2023-03-24

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Abstract: Objective To evaluate the effect of root filling paste penetrating into dentinal tubules after erbiumytrium aluminium garnet laser (Er:YAG) photon-initiated photoacoustic streaming (PIPS) irrigating primary teeth root canals by confocal laser scanning microscope (CLSM). 
Methods Twenty primary incisors and 20 primary molars were randomly divided into four groups according to final irrigation techniques and tooth positions: They were primary incisors through needle irrigation (Group A, n=10), primary incisors through Er:YAG-PIPS (Group B, n=10), primary molars through needle irrigation (Group C, n=10) and primary molars through Er:YAG-PIPS (Group D, n=10). After the conventional root canal preparation and different methods of root canal irrigation in vitro, Vitapex root canal filling paste mixed with rhodamine (fluorescent agent) was used for root canal filling. The cross sections of 3 mm (1/3 of the apex) and 5 mm (1/3 of the middle of the root) from the apex were observed by CLSM. The length of root canal filling paste penetrating into dentin tubules was measured to compare the effects of different irrigation methods on the penetration depth of root canal filling paste for primary teeth. 
Results The penetration depth of root filling paste in Group B and Group D was greater than that in Group A and Group C, and the penetration depth of root filling paste in Group A and Group B was greater than that in Group C and Group D, respectively. The penetration depth of root filling paste in the root canal of primary teeth at 5 mm of the root apex was greater than that at 3 mm of the root apex in each group, and the difference was statistically significant (P＜0.05). 
Conclusion The Er:YAG laser by PIPS-activated irrigation is more effective than traditional needle irrigation alone, which can significantly increase the penetration depth of root canal filling paste of primary teeth. However, the root canal morphology would have an impact on the effect of irrigation.


Key words: root canal therapy, lasers, solid-state, dentin