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Journal of Oral Laser Applications

Year 2003
Volume 3 , Issue 4

Pages: 219 - 227

Laser Application in Dental Apicectomy

Jun-Ichiro Kinoshita/Haruji Watanabe/Mir Nowazesh Ali/Emi Matsuoka/Nobuyuki Suzuki/Koukichi Matsumoto

Purpose: The present in vitro study was designed to compare the surface of human teeth after apicectomy using either the Er:YAG laser, the Er,Cr:YSGG laser, or a conventional technique, and to examine morphological changes by light microscopy and scanning electron microscopy (SEM). Materials and Methods: Conventional root canal treatment was performed on 40 extracted mature human teeth, which were then filled with gutta-percha and randomly divided into five groups based on the apicectomy method to be employed: conventional engine-driven fissure-bur, Er:YAG laser, Er,Cr:YSGG laser, and two additional modified laser test groups. Samples in each group were resected at the root tip to stimulate clinical apicectomy. All specimens were observed with light microscopy and SEM. The time needed to complete the resection in each case was recorded and the results analyzed. Results: Light microscopic observation revealed almost no difference in the root surface between samples in the two laser treatment groups, although the Er,Cr:YSGG laser left a smoother surface than the Er:YAG laser. The fissure bur left a rough surface, with cracks evident in some cases. SEM revealed that the dentinal tubules were plugged with debris and the surface was covered with a smear layer only in the fissure-bur group. Specimens in both the Er:YAG and Er,Cr:YSGG laser groups exhibited no gap between dentin and gutta-percha. The time taken for resection was longest when the Er,Cr:YSGG laser was used. Conclusion: These results suggest that apicectomy using the Er,Cr:YSGG laser is the most effective from the morphological standpoint, although this method is the most time consuming.


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