Differences between the chewing and non-chewing sides of the mandibular first molars and condyles in the closing phase during chewing in normal subjects

Tomonari, Hiroshi; Kwon, Sangho; Kuninori, Takaharu; Miyawaki, Shouichi

doi:10.1016/j.archoralbio.2017.05.006

Cited by 14 publications

(11 citation statements)

References 38 publications

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“…The chewing side first molar is positioned superior to the first molar on the contralateral side during early and middle closing phases of chewing. 23 A previous investigation revealed upward movement of the condyle on the nonchewing side during submaximal clenching on the unilateral side. 24 Palla et al 25 recorded smaller condole-fossa on the nonchewing side, compared with that on the chewing side, during the opening phase of the masticatory cycle.…”

Section: Discussionmentioning

confidence: 95%

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Association between preferred chewing side and dynamic occlusal parameters

et al. 2019

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Objectives Evaluation of dynamic occlusal parameters can help dentists to understand the association of occlusion with the preferred chewing side (PCS) and enable optimal restoration of masticatory efficiency. This study evaluated the association between PCS and dynamic occlusal parameters. Methods One hundred participants (50 each, right and left PCS) were included in this study. PCS was determined by the visual spot-checking method, and occlusal analysis was conducted by T Scan. Occlusal parameters evaluated included initial contact, center of force, tooth contact area, occlusal interferences, and occlusal time. Data were assessed by chi-squared test and eta correlation coefficient. Results Initial contact towards the PCS was observed in 68% and 70% of right and left unilateral chewers, respectively. Likewise, center of force towards the PCS was present in 72% and 66% of right and left unilateral chewers, respectively. A larger area of tooth contact was predominant towards the PCS in 70% and 72% of right and left unilateral chewers, respectively. Chi-squared analysis showed a strong positive correlation between PCS and occlusal parameters at maximum intercuspation. Eta correlation coefficients between PCS and occlusal interferences, as well as centric and eccentric occlusion, revealed negligible associations. Conclusion Dynamic occlusal parameters may be associated with PCS.

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Section: Discussionmentioning

confidence: 95%

Section: Discussionmentioning

confidence: 95%

Association between preferred chewing side and dynamic occlusal parameters

et al. 2019

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“…As for why the TMD patients with CSP had such a deep fossa and greater IAE, we speculate that the change of condyle position and increased load are the direct factors. Because the working side condyle is in a posterior and superior position during normal chewing movement [ 36 , 37 ]; the individuals with CSP would constantly repeat this position in the preferred side of joints rather than alternating with the balancing side, causing excessive load and the following adaptive changes of the joints [ 36 , 38 ]. The osseous remodeling secondary to disc displacement might also be another possibility.…”

Section: Discussionmentioning

confidence: 99%

Cone-beam computed tomographic assessment of the inclination of the articular eminence in patients with temporomandibular disorders and chewing side preference

Ma¹,

Wang

Huang

et al. 2021

BMC Oral Health

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Background Chewing side preference (CSP) has been proposed as one etiology of temporomandibular disorders (TMDs) as it can induce the structural changes of the temporomandibular joint. But its association with the inclination of the articular eminence (IAE) is unknown. This study aimed to compare IAE between patients with CSP and without CSP. Methods Cone-beam computed tomography images of 90 patients with TMD (mean age of 45.6 years, 69 with CSP, 21 without CSP) and 20 participants without TMD and CSP (mean age of 41.3 years) were measured to compare IAE and depth of the glenoid fossa (DGF) Results IAE and DGF showed a positive correlation among all the participants. Compared with the participants without TMD and CSP, the TMD patients without CSP presented a similar IAE but with a significantly higher value of DGF (p < 0.05); in contrast, the TMD patients with CSP presented a significantly greater IAE and DGF (p < 0.05). No bilateral differences in IAE and DGF were observed in all the participants. Except the male patients with CSP had a deeper fossa than did the female, no differences in IAE and DGF according to gender were observed. Conclusions TMD patients with CSP seem to have a deep glenoid fossa with steep eminence which might be considered one characteristic imaging feature.

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“…Unilateral chewing burdens the masticatory system unevenly [19]. Chewing on PCS strengthens bones and muscles unilaterally, possibly creating facial asymmetry [9,11,19,22]. The activation of osteoblasts and osteoclasts differs on both sides of the facial midline which may create facial asymmetry.…”

Section: Discussionmentioning

confidence: 99%

“…PCS affects facial asymmetry in many ways: bones and masticatory muscles are strengthened on one side, the condyles on the jaw move asymmetrically, and the apex of the chin twists. At the same time, the possibility of temporomandibular disorders (TMD) increases [19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Facial asymmetry and chewing sides in twins

Heikkinen

Vuollo

Harila

et al. 2021

Acta Odontologica Scandinavica

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Objective: To resolve how the preferred chewing side (PCS) affects facial asymmetry in twins, whether there are differences between monozygotic (MZ) and dizygotic (DZ) twins, and whether the twins with PCS have more asymmetric faces compared to symmetrically chewing twins. Material and methods: The study included 106 Lithuanian twin pairs of the same sex, 59 MZ and 47 DZ pairs. The data were analysed from facial 3D images and manually added landmarks. 3D images were analysed by Rapidform2006 software and statistical analyses were done by using the R software environment version 4.1.0. Results: The contralateral effect of PCS and larger chin side was dominant among right and non-right side chewing twins. Being female increased the whole face symmetry. Conclusion:The volume of the chin becomes larger on the side opposite to the twins' habitual chewing side. As the results are quite similar in both twin types, functional factors are more prominent than heredity.

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Differences between the chewing and non-chewing sides of the mandibular first molars and condyles in the closing phase during chewing in normal subjects

Cited by 14 publications

References 38 publications

Association between preferred chewing side and dynamic occlusal parameters

Association between preferred chewing side and dynamic occlusal parameters

Cone-beam computed tomographic assessment of the inclination of the articular eminence in patients with temporomandibular disorders and chewing side preference

Facial asymmetry and chewing sides in twins

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