Abstract
ObjectiveTo evaluate the effect of semiconductor laser irradiation on root canal sealing after routine root canal therapy (RCT).MethodsSixty freshly extracted single-rooted human teeth were randomly divided into six groups (n = 10). The anatomic crowns were sectioned at the cementoenamel junction and the remaining roots were prepared endodontically with conventional RCT methods. Groups A and B were irradiated with semiconductor laser at 1W for 20 seconds; Groups C and D were ultrasonically rinsed for 60 seconds as positive control groups; Groups E and F without treatment of root canal prior to RCT as negative control groups. Root canal sealing of Groups A, C and E were evaluated by measurements of apical microleakage. The teeth from Groups B, D and F were sectioned, and the micro-structures were examined with scanning electron microscopy (SEM). One way ANOVA and LSD-t test were used for statistical analysis (α = .05).ResultsThe apical sealing of both the laser irradiated group and the ultrasonic irrigated group were significantly different from the control group (p<0.5). There was no significant difference between the laser irradiated group and the ultrasonic irrigated group (p>0.5). SEM observation showed that most of the dentinal tubules in the laser irradiation group melted, narrowed or closed, while most of the dentinal tubules in the ultrasonic irrigation group were filled with tooth paste.ConclusionThe application of semiconductor laser prior to root canal obturation increases the apical sealing of the roots treated.
Highlights
Pulpitis and periapical periodontitis are the most common oral bacterial infectious diseases in human, with Pain, tooth defect and dysfunction being the major clinical manifestations
scanning electron microscopy (SEM) observation showed that most of the dentinal tubules in the laser irradiation group melted, narrowed or closed, while most of the dentinal tubules in the ultrasonic irrigation group were filled with tooth paste
The results show that there was no significant difference in the length of dye microleakage between groups A and C (p> 0.05). Both roots in group A and the group C showed significant reduction in the length of dye microleakage as opposed to those from group E (p
Summary
Pulpitis and periapical periodontitis are the most common oral bacterial infectious diseases in human, with Pain, tooth defect and dysfunction being the major clinical manifestations. Root canal therapy (RCT) is currently the most effective and most commonly provided treatment [1]. The ultimate goal of RCT is to close the root canal system, especially in the last 1/3 of the root tip. RCT prevents bacteria in oral environment from entering and reinfecting the root canal, prevents the tissue fluid from going into the root canal and becoming the residual bacteria culture media, and prevents the occurrence of periodontitis. The apical sealing of the root canal is one of the important indicators to a successful RCT [2]. It has been shown that 58.66% of the RCT failure was caused by incomplete root canal closure [3]. Various methods have been used to achieve an optimal root canal closure, such as root canal filling with certain materials after root canal irrigation reverse filling after apicoectomy [4,5,6,7]
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