ABSTRACT
Objective @#To investigate the influence of abnormal occlusion factors on the incidence of temporomandibular disorders (TMDs) in junior college students and to provide an etiological basis for the prevention and treatment of TMDs.@*Methods @# We examined the temporomandibular joint (TMJ) and dental occlusion in 754 lower grade college students (male 354, female 400) at Zunyi Medical University (Zhuhai campus). A questionnaire was also administered. We analyzed the correlation between TMD and the other three factors (static abnormal occlusion, dynamical abnormal occlusion and oral parafunctional activity) from the perspective of multivariate unconditioned logistic regression and univariate unconditioned logistic regression with dummy variables.@*Results @#The prevalence of TMD was 31.7%. The incidence of TMD was significantly (P<0.05) associated with sleep bruxism (OR=2.070), clenching (OR=2.553), diurnal (OR=2.642) and anterior teeth overbite (OR=1.228). Univariate unconditioned logistics regression analysis by dummy variables was used to analyze the incidence of TMD at different deep overbites (mild, OR=1.558; moderate, OR=2.189; severe, OR=3.236; P<0.05). @*Conclusion@#The risk factors for TMD in lower grade college students included anterior teeth occlusion, sleep bruxism, clenching, and diurnal treatment. Worse deep overbite might increase the risk of TMD.
ABSTRACT
BACKGROUND: Unilateral masticatory muscle spasm is a rare disease without a generally accepted and efficacious treatment plan. OBJECTIVE: We sought to compare the effects of different surgical treatments on unilateral masticatory muscle spasm. METHODS: A retrospective analysis of the surgical treatment and effects of 10 cases of unilateral masticatory muscle spasm occurred between February 2010 and September 2016. Three cases underwent complete amputation of the trigeminal motor branch, 3 cases underwent partial amputation of the trigeminal motor branch, and 4 cases received only vascular decompression. All patients were followed up by telephone interview after surgery. RESULTS: In the simple vascular decompression group, 3 cases were cured and 1 was cured after a delay. Of these 3 cases, 1 case became aggravated 2 years after the operation, 1 case became aggravated 5 years after the operation, and 1 case showed no change during the follow-up period. In the partial amputation group, 2 cases were cured and 1 case was alleviated. Of the 2 patients who were cured, 1 suffered recurrence 2 years later, while the other case showed no recurrence during the follow-up period. In the complete amputation group, 1 case was cured with a delay and 2 cases were cured immediately with no recurrence during the follow-up. Mild atrophy of the temporal muscle occurred gradually with no restriction of the mouth opening in 2 cases. CONCLUSIONS: Complete amputation of the trigeminal nerve did achieve better effects than pure microvascular decompression and partial amputation of the trigeminal motor branch, but it may lead to mild temporal muscle atrophy.
