Temperature variation in the pulp during Nd-YAG laser irradiation at tooth cervical protion in vitro
10.3969/j.issn.1001-3733.2016.01.020
- VernacularTitle:Nd-YAG 激光照射牙冠颈部髓腔内温度变化的实验研究
- Author:
Yuangao LI
;
Xiao WANG
;
Kexian XIE
;
Dan LIU
- Publication Type:Journal Article
- Keywords:
Nd-YAG laser;
Temperature variation;
Thickness oftooth tissue
- From:
Journal of Practical Stomatology
2016;32(1):96-98
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To observe the temperature vaxiation in the pulp chamber during Nd-YAG laser irradiation at tooth cervical portion.Methods:60 extracted permanent teeth were divided into 3 groups (anterior teeth,premolars and molars,n =20).The teeth in each group were further divided into 4 subgroups according to the laser power setting (0.4 W,0.8 W)and interval time(1 0 s,20 s)(n =5).After canal preparation the teeth were fixed and filmed using the parallel projection technique.the thickness of the buccal pulp chamber wall was measured by graphic analyzing software.The buccal cervical portion of the teeth was irradiated through 200 μm optical fiber,Temperature in the pulp was measured by K type thermo-electric couples fixed to the pulp chamber wall.Re-sults:The temperature inside the chamber increased with the higher power setting(P <0.01 ),under the same power setting,longer irradiation duration caused higher temperature rise(P <0.01 ).Greater chamber wall thickness was associated with lower temperature rise.Conclusion:The temperature rise in the pulp chamber during laser irradiation is correlated with laser power setting and the thickness of the irradiated tooth tissue.
