Association of horizontal and vertical overlap with prevalence of temporomandibular disorders

Abstract

The aim of the study was to evaluate the relationship between horizontal (HO) and vertical overlap (VO) and prevalence of temporomandibular disorders (TMD) in a non-patient population. Out of the total number of subjects (230), 65.7% subjects were classified as asymptomatic, 5.7% subjects had muscle disorders (MD) (myalgia), 9.1% subjects had disc displacement with reduction (DDR), while 19.6% subjects had disc displacement with reduction associated with muscle disorder (DDR + MD) (myalgia). The HO equal to or greater than 5 mm was significantly more prevalent in the symptomatic patients (MD, DDR, DDR + MD) than in the asymptomatic group (P < 0.001). The VO equal to or > 5 mm also demonstrated statistically significant difference (P < 0.006) between the symptomatic (suffering from DDR, and DDR + MD) and asymptomatic subjects. Conclusion of the study is that the HO and VO equal to or > 5 mm was more present in the group of subjects with diagnosis of a TMD (DDR and MD), what distinguishes this group from the group of asymptomatic subjects.

Immediate Effects of Combining Local Techniques in the Craniomandibular Area and Hamstring Muscle Stretching in Subjects with Temporomandibular Disorders: A Randomized Controlled Study

“…The inclusion criteria were (1) diagnosis of having myofascial pain in the TMJ, with or without limited opening and bilateral pain, for at least 6 months, according to the Research Diagnostic Criteria for Temporomandibular Disorders 28 ; (2) a positive response to the anamnesic index for TMD 29 ; (3) age between 18 and 50 years; (4) presence of local and referred pain after manual pressure of tense bands in the masseter muscles 30 ; (5) restricted mobility in the anterior-posterior condilar mobility test 31 ; and (6) restricted mobility of the first cervical vertebrae (C1) in the cervical flexion-rotation test. [32][33][34] The exclusion criteria were (1) a previous cervical whiplash; (2) severe traumatisms, surgery, and/or fractures in the mandibular condyle, TMJ, craniofacial region, and/or any spinal level; (3) degenerative, systemic, rheumatic, or tumoral disorders; (4) being under psychiatric treatment; (5) having received manual therapy within eight weeks before data collection; (6) being under orthodontic treatment; and (7) consumption of analgesics or anti-inflammatory drugs within 48 hours before the study.…”

Orthodontics and Temporomandibular Disorders. Are They Related?

“…Other than crossbite, the relationships between TMD and openbite, increased overjet, and reverse overjet have also been analyzed; in some studies, these malocclusions have been related to TMDs. [22][23][24] Anterior openbite has been reported to be a risk factor that could prevent the normal functioning of a regular joint. 23,25 It was also claimed that anterior openbite aggravated myofascial pain.…”

“…Another malocclusion related to TMD is deepbite. 24,29,30 In the presence of minimal overjet with deepbite, at the beginning of mouth opening, translation of the condyle is inhibited and, because of its pure rotation, the superior lateral pterygoid muscle stretches, causing it to be ineffective in stabilizing the disk. Thus, movement of the disk to a lateral position may occur, causing a click sound.…”

“…Thus, movement of the disk to a lateral position may occur, causing a click sound. 29,30 In another study, subjects with TMD and non-TMD symptoms were evaluated according to their degree of overjet and overbite; within the symptomatic group, the percentage of patients with overjet and overbite of 5 mm or more was higher than in the asymptomatic group 24 Pullinger et al 31 compared occlusal variables and TMD and stated that persons with Class II Div 2 malocclusion had greater TMJ sensitivity than those with Class I malocclusion. In contrast to previous research, in a study of TMD symptoms in patients with clinically normal overbite and deepbite, there was no difference in terms of TMD symptoms.…”

Investigation of the Relationship between Increased Vertical Overlap with Minimum Horizontal Overlap and the Signs of Temporomandibular Disorders

“…In numerous studies, the relationship between increased vertical overlap between anterior teeth and TMD has been analyzed . Some investigators have reported a positive association between increased vertical overlap and TMD signs and symptoms . In contrast, other studies did not find any relationship between these variables .…”