[Purpose] The purpose of this study was to investigate the association between psychosocial stress, occupational stress, and musculoskeletal symptoms in Korean dental practitioners. [Subjects and Methods] Self-reported questionnaires were distributed to 401 dental practitioners in Korea. To assess the risk factors related to musculoskeletal disorders, the Nordic Musculoskeletal Questionnaire, the Korean Occupational Stress Scale, and Psychosocial Well-Being Index Short Form were used. General and work-related characteristics of the subjects consisted of seven items, including age, career, height, weight, working days/week, working hours/day, and physical strain levels. [Results] In this study, 86.8% of the practitioners experienced musculoskeletal symptoms (shoulders, 72.8%; neck, 69.3%; waist, 68.3%; wrist, 58.4%; back, 44.1%; ankle, 38.7%; knee, 36.9%; hip, 20.4%; and elbows, 9.2%). Moreover, psychosocial and occupational stress can affect the occurrence of musculoskeletal disorders. In particular, we found that psychosocial stress has significant influence on the occurrence of musculoskeletal disorders. [Conclusion] To increase the quality of life and provide high-quality medical service for dental practitioners, risk factors for musculoskeletal disorders must be managed. Accordingly, dental practitioners must maintain good posture, get an appropriate amount of rest, and perform regular stretching exercise to reduce psychological stress and improve the work environment.

Objective: This study aimed to quantitatively confirm the effects of dental specialists’ work and stretching on musculoskeletal pain. Methods: The pain pressure threshold was divided into five parts (neck, shoulder, trunk, lower back, and hand/arm) of the upper body and measured at 15 muscle trigger points. The pain pressure threshold before and after work was measured, and 30 min of stretching and rest were stipulated as an intervention. Results: The pain pressure thresholds reduced significantly in all muscles after work (P < .05). In the stretching group, the pain pressure thresholds increased significantly in all muscles (P < .05). In particular, the iliocostalis lumborum (lower back), rhomboid (trunk), transverse carpal ligament (hand/arm), levator scapulae-superior angle (neck), and upper trapezius (shoulder) muscles showed the greatest decrease in pain pressure threshold after work and the greatest increase after stretching. Conclusions: Stretching helps immediately relieve musculoskeletal pain in dental professionals and can prevent and manage work-related musculoskeletal disorders.

Work-related musculoskeletal symptom disorders (WMSDs) have a significant issue for dental professionals. This study investigated the effects of high-frequency transcutaneous electrical nerve stimulation (TENS) on work-related pain, fatigue, and the active range of motion in dental professionals. Among recruited 47 dental professionals with WMSDs, 24 subjects received high-frequency TENS (the TENS group), while 23 subjects received placebo stimulation (the placebo group). TENS was applied to the muscle trigger points of the levator scapulae and upper trapezius, while placebo-TENS was administered without electrical stimulation during 60 min. Pain and fatigue at rest and during movement were assessed using the visual analog scale (VAS), pain pressure threshold (PPT), and active range of motion (AROM) of horizontal head rotation at six time points: prelabor, postlabor, post-TENS, and at 1 h, 3 h, and 1 day after TENS application. Both groups showed significantly increased pain and fatigue and decreased PPT and AROM after completing a work task. The TENS group showed significantly greater improvements in VAS score, fatigue, PPT, and AROM at post-TENS and at 1 h and 3 h after application (allP< 0.05) as compared to the placebo group. A single session high-frequency TENS may immediately reduce symptoms related to WMSDs in dental professionals.

Propolis is a natural substance which is produced from honey bees through collecting and transforming resins and exudates from plants. The propolis can use the medicine field for antibacterial effect. The purpose of our study was to investigate the antibacterial activity for the oral prevention of dental caries. The propolis was from Australia honeybees, diluted 5w% and 10w% in ethanol. The antibacterial activity of the treated propolis against Streptococcus gordonii(S. gordonii), Streptococcus intermedius(S. intermedius) and Streptococcus sanguinis(S. sanguinis) were determined using optical density and colony forming units. All experimental groups were effective against bacteria. Streptococcus intermedius and Streptococcus sanguinis were more effective compared to Streptococcus gordonii. All groups inhibition bacterial growth, but there were no significant differences of different wt% groups. There were significantly low activities treated with propolis. The antibacterial activity indicated propolis against Streptococcus gordonii, Streptococcus intermedius and Streptococcus sanguinis. Propolis possesses several medicinal properties. In this study, the 5 wt% and 10 wt% group of propolis was indicated antibacterial effects, which succeeded in inhibiting the bacteria growth. Our study showed a significant effect related to oral bacteria species. In conclusion, the antibacterial action observed in this study suggests that this propolis substance could be used as an alternative medicine for infectious conditions of the oral disease without causing any major local or systemic adverse effects.