Clinical assessment of occlusion and temporomandibular joint after placement of preformed metal crowns for primary molars / 口腔疾病防治

Objective @#To explore the effect on children's occlusion and temporomandibular joint (TMJ) after placement of preformed metal crowns and provide a reference for the restoration of defective primary molars. @*Methods @#A total of 39 children who underwent all primary molar metal crown restorations under general anesthesia were enrolled. The participants underwent occlusal contact area, percentage of total occlusal force, asymmetric ratio of occlusal force and occlusal contact time examinations with the T-scan computerized occlusal analysis system. Vertical dimension of occlusion (VDO) was measured using a dental vertical dimension gauge. TMJ dysfunction signs were recorded using the modified clinical dysfunction index (Di), and TMJ dysfunction symptoms were recorded using questionnaires. All data were collected at pretreatment, 1-week, 1-month, 3-month, and 6-month follow-up visits. @*Results@#The occlusal contact area at the 3-month and 6-month follow-up visits returned to the occlusal contact area of pretreatment, and the difference was statistically significant (P>0.05). Compared with pretreatment, the percentage of total occlusal force at the 3-month and 6-month follow-up visits increased significantly, and the difference was statistically significant (P<0.05). The asymmetric ratio of occlusal force and the occlusal contact time were significantly decreased at the 6-month follow-up visit (P<0.05). The vertical dimension of occlusion recovered after one month of treatment (P>0.05). The final statistical analysis of the TMJ assessment showed that there was no significant difference in the clinical disorder index and TMJ dysfunction symptoms before and after treatment (P>0.05). @*Conclusions @# After undergoing all primary molar metal crown restorations, occlusal re-equilibrations were attained after approximately one month. The percentage of total occlusal force and occlusal stability were significantly increased after six months of treatment, without significant temporomandibular joint dysfunction.

Research progress on berberine in the prevention and treatment for periodontitis / 口腔疾病防治

@#Berberine is a natural isoquinoline alkaloid extracted from Rhizoma Coptidis and other Chinese herbal medicines. Since berberine has a variety of biological effects, such as bacteriostasis, anti-inflammatory, anti-bone resorption and blood sugar-lowering effects, and is associated with few side effects, studies are increasingly discovering its potential application in the prevention and treatment of periodontitis. This review summarizes the relevant research progress of berberine in the prevention and treatment of periodontitis in recent years, aiming to provide a new strategy for the clinical prevention and treatment of periodontitis. The results of the literature review showed that berberine could prevent the occurrence and development of periodontitis by inhibiting periodontal pathogens, reducing periodontal tissue inflammation and inhibiting alveolar bone resorption. However, the mechanism of periodontitis is complicated, and current research remains limited. In the future, more in vivo and in vitro studies are needed to further explore the mechanism of berberine in inhibiting the occurrence and development of periodontitis, and more large-sample prospective clinical studies should be conducted to confirm the effect of berberine on the prevention and treatment of periodontitis.