• Journal of Dental Rehabilitation and Applied Science
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• v.27 no.1
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• pp.99-107
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• 2011

The main objective of nonsurgical retreatment is to disinfect the root canal space for periradicular healing. Thus, efficient removal of the filling material from the root canal system is essential to ensure a favorable outcome. Traditionally, the removal of root canal filling material was performed by stainless steel hand instrument and this procedure is time and effort-consuming. Recently, rotary NiTi retreatment instruments are developed to effective removal of root canal filling material. The aim of this study was to evaluate the effectiveness of stainless-steel hand instrument and rotary NiTi retreatment instrument when removing gutta-percha in curved root canals. For the remaining materials, there were no significant differences between groups. But the rotary NiTi system proved to be faster than hand instruments in removing root filling materials.

• Restorative Dentistry and Endodontics
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• v.30 no.3
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• pp.215-220
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• 2005

It is common for clinicians to encounter endodontically tl·treated teeth that contain posts within their roots. If endodontic treatment is failed, these posts must be removed to facilitate successful nonsurgical retreatment. There have been many techniques such as ultrasonic instrument, Ruddle post removal system, Eggler post remover and Masserann kit developed to facilitate removal of posts from the root canal space. But these methods may be disadvantageous because long length of time required for post removal and fracture of post or teeth. In now days new post removal technique using ATD automatic bridge remover was introduced. Advantages of this method are simple and short time consuming compare to others. This article served as a successful case report of post removal using ATD automatic bridge remover.

• The Journal of Korean Medicine
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• v.42 no.2
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• pp.1-20
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• 2021

Objectives: The purpose of this study was to confirm the relavance between the dependent variables and the treatment effects of nonsurgical spinal decompression(NSD). Methods: 105 patients suffering from disc herniation and treated with NSD were investigated and analyzed. Results: The intention of retreatment showed a tendency to be higher in having occupation, western treatment only before NSD(WTB) and non-western treatment(WTN) group. As the number of NSD increased, satisfaction score and the Numeric Rating Scale(NRS) difference increased and the NRS after NSD decreased. On the other hand, as western treatment after NSD increased, satisfaction score and the NRS difference decreased and the NRS after NSD increased. The odds ratio of having intention of retreatment was lower in western treatment only after NSD(WTA) group than WTN group. The NRS difference showed a high tendency in the age group of 20s, 60s, and 70s and older. The NRS difference of group with NSD more than 10 times was higher than that of the group with less than 10 times. Satisfaction score of WTN and WTB group was higher than that of WTA group. Adjusted NRS after NSD was the lowest in non-western treatment group and the highest in WTA group. Adjusted NRS after NSD was the lowest in the group with NSD over 21 times, and the NRS after NSD increased as the number of NSD decreased. Conclusion: This study included patients with cervical or lumbar disc herniation and showed that occupation, the number of NSD, western treatment and age statistically affected the treatment effect.

• Restorative Dentistry and Endodontics
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• v.35 no.6
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• pp.436-444
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• 2010

Objectives: This study aimed to assess prospectively the clinical outcome of nonsurgical endodontic treatment and identify patient- and tooth-related factors, rather than treatment-related factors, that were the best predictors of this outcome. Materials and Methods: The inception cohort comprised 441 teeth (320 patients) and 175 teeth (123 patients) were followed up for 1-2 years. Age, gender, presence of medical disease, number of canals, previous endodontic treatment, presence of sensitivity and pain, pulp vitality, swelling or sinus tract of pulpal origin on the gingiva, periapical radiolucency and tendency of unilateral bite on the affected tooth were recorded at treatment start. Results: The outcome was classified on the basis of periapical radiolucency as healed or non healed. The overall healed rate in these cases, including nonsurgical retreatment, was 81.1%. Four tooth-related factors had a negative impact in the bivariate analysis: previous endodontic treatment, necrotic pulp, preoperative gingival swelling or sinus tract of pulpal origin, and preoperative periapical radiolucency. Stepwise logistic regression analysis including patient-, tooth-related factors and level of the root canal filling as a treatment-related factor showed that preoperative gingival lesion (odds ratio [OR]: 4.4; p = 0.005), preoperative periapical radiolucency (OR: 3.6; p = 0.011), and $\leq$ 1-2 mm under root filling length (OR: 9.6; p = 0.012) were significant predictors of failure. Conclusions: A preoperative gingival lesion of pulpal origin can influence the outcome of nonsurgical endodontic treatment in addition to preoperative periapical radiolucency.

• Restorative Dentistry and Endodontics
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• v.37 no.1
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• pp.50-53
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• 2012

Cone-beam computed tomography (CBCT) is a useful diagnostic tool for identification of both internal and external root configurations. This case report describes the endodontic management of a lateral incisor with both dens invaginatus and external root irregularity by using CBCT. Nonsurgical endodontic retreatment was performed on the lateral incisor with dens invaginatus. A perforation through the dens invaginatus and external concavity was repaired using mineral trioxide aggregate. After 18 mon of follow-up, there were no clinical symptoms. Recall radiographs appeared normal and showed healing of the periapical pathosis. The understanding of both internal root canal configuration and external root irregularity using CBCT can ensure predictable and successful results.