ISSN : 0376-4672
Currently the unofficial health care system is growing in North Korea as the socialist public free medical treatment system is not working properly due to the prolonged economic recession. In the Kim Jong-Un era, the North Korean government has been making investments in the medical sector recommending policies for the development of the health care system. Suggestions such as the establishment of a health care system and large scale hospitals have been discussed, but the public and private systems are unbalanced in all the medical segments where the private sector seems to be growing at a faster pace. Such examples would be the pharmaceutical supply and medical delivery systems. A survey of in-depth interviews with 53 North Korean defectors who resided at Hanawon, South Korea in 2020 revealed that dentistry, particularly the prosthetic sector, is recognized mostly as private paying care and is rapidly growing. Overall oral healthcare, including dental care, is provided in private facilities of dental care providers outside the current public healthcare system. The growth and demand for dental care is supported in that it is observed very few patients who had missing teeth had received prosthetic treatment before 2010, while nearly half of those with lost teeth received prosthetic treatments at a personal private cost after 2018. Through this research, it is evaluated there is a strong growing demand for dental care in North Korea, and unofficial private dental care is filling the need as the current government system is inadequate.
Purpose: This study was conducted to evaluate the influence of contamination of the scan-mirror on the accuracy of obtained scan data by using two type of intra-oral scanner. Materials & methods: After printing the Crown & inlay specimens according to the ISO standard, the data values of the specimens were calculated using a model scanner and two intra-oral scanners. Experimental groups were classified into three groups according to cleanliness of scan-mirror. Each group performed 10 repeated scans. Data analysis was performed with statistical software (SPSS 25, IBM Corp., Armonk, New York, USA) to check the normality of data sets andA NOVA & Bonferroni test was performed for multiple comparisons betwen groups. Results: The d1(top diameter of cylinder), d2(bottom diameter of cylinder), h(cylinder height) values of the crown specimens and d1(top diameter of cavity), d2(bottom diameter of cavity), h(cavity height) of the inlay specimens compared with the reference data using two intra-oral scanners were similar for each group. Discussion: In the scanning process, it was observed on the screen that a data value that deviated from the normal range was inputted in the group with higher level of contamination, but they were removed through the software’s own filtering and post-processing, and it was found that there was no significant effect on the result values. Conclusion: Under the conditions of this study, as the degree of contamination of the scan-mirror surface increased, an inaccurate capture screen appeared, but it did not significantly affect the accuracy and percision of the scan data.
It has been well known that mesiobuccal roots of maxillary molars tend to have more than 1 canals. 2nd mesiobuccal canals are in many cases calcified. So clinicians often have difficulty in finding these 2nd mesiobuccal canals. Moreover, the root canal morphology of mesiobuccal roots of maxillary molars is complex in many cases. To find and treat 2nd mesiobuccal canals, knowledge on incidence, type, and location of 2nd mesiobuccal canals is necessary. Use of Cone-Beam computed tomography (CBCT) is also helpful for finding 2nd mesiobuccal canals. And also, it is recommended to use proper illumination and magnification along with the use of instruments such as front surface mirror, long shank bur, and ultrasonic tips.
Root resorption is very rare disease in the dental field. However, when dentist faced root resorption in the clinic without knowledge, it is very difficult situation to solve. Root resorption can be classified into external root resorption and internal root resorption according to developing place of resorption. Also, root resorption is classified into surface resorption, inflammatory resorption, replacement resorption according to developing reason of resorption. In this article, we can understand the cause and reason of root resorption development and can know how to prevent and treat the root resorption
Root canal treatment of immature permanent teeth with pulp necrosis presents clinical difficulties due to wide root canals and apical foramen. In addition, there is a high risk associated with a potential cervical fracture due to the thin dentinal walls even after successful root canal treatment. Thus, a notion of continued root development of the immature tooth has continuously explored. Regenerative endodontic treatment (RET) provides a biological treatment approach based on regeneration and revascularization principles. Unlike conventional apexification, RET promotes the growth and development of immature roots and the healing of the periapical lesion via disinfection of the infected root canal system. Therefore, RET may provide a positive effect on the long-term prognosis of immature permanent teeth with pulp necrosis.
