Comparative observation on the effect of external wall temperature and inner wall morphology of root canal by heated plugger between warm Gutta-percha filling and single-cone obturation
AIM:To compare the influence of heated plugger on tooth root during root canal filling by hot gutta-percha filling or single-cone technique.METHODS:42 freshly extracted premolars with single canal were selected.The root canals were mechanically instrumented to a master apical file of size 35/.04#.According to the surgical methods,40 teeth were randomly divided into 4 groups.The temperature of the plugger was adjusted to simulating thermal gutta-percha filling(group A:160℃,group B:180℃,group C:200℃)and single-cone technique(group D:200℃).The temperature changes of the upper part of the root surface(2 mm below the enamel cementum boundary),the middle part of root(1/2 root length)and the lower part of root(3 mm above the apical foramen)were measured by infrared thermal imager.The remaining 2 teeth were used as control group to observe the inner wall of root canal by scanning electron microscope.RESULTS:The heat generated by plugger in hot gutta-percha filling was much higher than that in single-cone technique.The middle of root was the part with the highest temperature rise during the process in group A,B and C.The surface temperature of the root increased by more than 10℃when the plugger treated at 180℃.CONCLUSION:There is no obvious temperature stimulation to the root during the single-cone technique of root canal filling.During thermal gutta-percha filling,the plugger temperature higher than 180℃may cause thermal damage to the root and periodontal tissues.Therefore,it is recommended to reduce the operating temperature and shorten the heating time.
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