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ISSN : 0376-4672
Purpose: This study aimed to compare the shear bond strength of two Korean flowable resin composites (Shoot Flow Pack, EsFlow) and two imported flowable resin composites (Filtek Supreme Flowable Restorative, G-aenial Flo X) to dentin using Adper Single Bond 2 adhesive. Materials and Methods: Forty extracted premolars were prepared, and four types of flowable resin composites were bonded to dentin surfaces using teflon molds. Shear bond strength was measured using an universal testing machine after 24-hour storage in water at 37℃, and fracture surfaces were evaluated with a scanning electron microscope. Results: Mean shear bond strengths were Shoot Flow Pack (12.68 MPa), EsFlow (12.00 MPa), Filtek Supreme Flow- able Restorative (15.29 MPa), and G-aenial Flo X (21.19 MPa). G-aenial Flo X showed significantly higher shear bond strength compared to the other three resin composites, which showed no significant differences among them. Conclusion: Korean flowable resin composites showed comparable shear bond strengths to some imported resin composites, although G-aenial Flo X exhibited significantly higher shear bond strength. Further studies are need- ed to evaluate the clinical applicability of Korean resin composites. (J Korean Dent Assoc 2025; 63(9): 283-289)
Purpose: This study aimed to investigate dentists' perceptions regarding the need for disciplinary action against unethical dental practices, appropriate levels of punishment, and necessary improvements to related systems and environments. Materials and Methods: An online self-administered survey was distributed to 28,949 members of the Korean Dental Association, and responses from 2,063 dentists were included in the final analysis. The questionnaire cov- ered demographic characteristics, types of misconduct, preferred disciplinary levels, and opinions on systemic improvements. Frequency and chi-square analyses were conducted. Results: “Illegal dental clinics operated by non-dentists” were identified as the most serious unethical practice (49.3%), and “license revocation” (48.3%) was viewed as the most appropriate disciplinary action. Other miscon- ducts, such as delegated treatment, over-treatment, and illegal advertising, were primarily associated with “license suspension.” As for improvement strategies, “Improved medical fee” (45.0%) and “adjusting dental school enroll- ment” (28.3%) were the most frequently cited. Significant associations were found between perceived misconduct types and preferred disciplinary actions and reforms (p<0.05). Conclusion: Dentists recognize the need for strict disciplinary measures and structural reforms to address unethi- cal behavior. Emphasis was placed on the establishment of a professional self-regulation system, as well as parallel improvements in the fee system and workforce distribution policies. The findings of this study provide foundational evidence for policy development toward effective disciplinary and regulatory systems in dentistry. (J Korean Dent Assoc 2025; 63(9): 290-297)
Purpose: Root resorption of second molars (M2s) due to impacted third molars (M3s) can result in pulp exposure of second molars. Platelet rich fibrin (PRF) has recently been investigated because of its positive effect on tissue healing. This study aims to determine the clinical utility of applying PRF to pulp exposure site of second molars affected by impacted third molars using radiological and clinical examination. Materials and Methods: Ten patients with exposed pulp of M2 by impacted M3 were evaluated clinically and radiographically before surgery. Extraction of M3 was performed and average follow up period was 8.3 months (ranged from 1 week to 40 months). Extraction was done using conventional method and PRF was applied to pulp exposure site. PRF was obtained by collecting the patient’s blood and spinning it in a centrifuge at 1300 RPM for 15 minutes. After extraction of M3, clinical and radiographic exam was done regularly to evaluate dentin bridge formation, bony healing and viability of M2. Results: In 6 of 10 patients who underwent regular follow-up, dentin bridge formation and bony healing were ob- served radiographically at the site of PRF application. All patients remained free of symptoms implying additional external root resorption or pulp necrosis. Conclusion: This study shows that the application of PRF on M2 pulp exposure site associated with impacted M3 is effective in promoting healing. Although this study demonstrates beneficial effect of PRF, further controlled studies are warranted.. (J Korean Dent Assoc 2025; 63(9): 298-303)
With the rise in facial cosmetic procedures, dental practitioners are increasingly encountering incidental ra- diographic findings attributable to dermal fillers. In particular, fillers injected in the anterior mandible may manifest as well-defined radiolucent area on panoramic radiographs, potentially mimicking cystic lesions. This report presents a case in which a radiolucent lesion observed in the mandible on panoramic imaging was ini- tially suspected to be intraosseous. However, cone-beam computed tomography (CBCT) revealed the lesion to be extraosseous in nature, representing labial cortical bone resorption associated with cosmetic filler injection. The initial imaging appearance suggested a pathologic entity, but CBCT was instrumental in clarifying the diagnosis and excluding odontogenic lesion. Filler-induced bone resorption can closely resemble true pathological lesions, posing a risk of misdiagnosis. Comprehensive patient history taking, combined with advanced imaging such as CBCT, is essential for accurate diagnosis. Awareness of filler-related complications helps prevent misdiagnosis. (J Korean Dent Assoc 2025; 63(9): 304-308)
This case series analyzes five patients treated at the Department of Oral and Maxillofacial Surgery at Kyung Hee University Dental Hospital for iatrogenic inferior alveolar nerve injuries caused by the extrusion of endodontic materials (calcium hydroxide paste and an MTA-based sealer). The study evaluates the clinical characteristics, symptom onset, anatomical injury distribution, and treatment outcomes for each case. By identifying patterns in radiographic and symptomatic findings, it aims to clarify the degree of nerve involvement and explores how the physicochemical properties of each material affect the perineural space. Through a review of recovery patterns following both surgical and conservative management, the report serves as a practical reference for clinicians. Ultimately, it emphasizes the critical importance of meticulous technique in root canal procedures and the ne- cessity of timely diagnostic imaging when nerve injury is suspected. (J Korean Dent Assoc 2025; 63(9): 309-315)
