Interferential effect of the over-erupted third molar on chewing movement

Guo, Shaoxiong; Li, Baoyong; Qi, Kun; Zhang, Mian; Zhang, Han; Guo, Dongwei; Liu, Xiaodong; Wang, Meiqing

doi:10.1016/j.archoralbio.2017.06.012

Cited by 4 publications

(4 citation statements)

References 26 publications

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“…The mandibular movements were recorded by EGN and BioPAK system software (both by Bioresearch Associates, Inc., Milwaukee, WI, USA). 41 Briefly, a magnet was attached to the labial surface of the mandibular central incisors without interfering with any movements of the mandible. The sensor array was fixed on the subject’s head, as we previously reported.…”

Section: Methodsmentioning

confidence: 99%

“…It is indicated that stress analysis can be performed based on muscle liked concentrated force and the defined displacement boundary condition. 40 Using the recorded mandibular displacement as the boundary condition, a reformative FEM, termed the displacement boundary condition finite element model (DBC-FEM) 41 could be developed where the muscular forces are no longer necessary to analyze occlusal stress. The DBC-FEM model is an explicit scheme that efficiently solves highly nonlinear problems, especially when dealing with complex contacts and large deformations.…”

Section: Introductionmentioning

confidence: 99%

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Development of a biomechanical model for dynamic occlusal stress analysis

et al. 2021

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The use of traditional finite element method (FEM) in occlusal stress analysis is limited due to the complexity of musculature simulation. The present purpose was to develop a displacement boundary condition (DBC)-FEM, which evaded the muscle factor, to predict the dynamic occlusal stress. The geometry of the DBC-FEM was developed based on the scanned plastic casts obtained from a volunteer. The electrognathographic and video recorded jaw positional messages were adopted to analyze the dynamic occlusal stress. The volunteer exhibited asymmetrical lateral movements, so that the occlusal stress was further analyzed by using the parameters obtained from the right-side eccentric movement, which was 6.9 mm long, in the stress task of the left-side eccentric movement, which was 4.1 mm long. Further, virtual occlusion modification was performed by using the carving tool software aiming to improve the occlusal morphology at the loading sites. T-Scan Occlusal System was used as a control of the in vivo detection for the location and strength of the occlusal contacts. Data obtained from the calculation using the present developed DBC-FEM indicated that the stress distribution on the dental surface changed dynamically with the occlusal contacts. Consistent with the T-Scan recordings, the right-side molars always showed contacts and higher levels of stress. Replacing the left-side eccentric movement trace by the right-side one enhanced the simulated stress on the right-side molars while modification of the right-side molars reduced the simulated stress. The present DBC-FEM offers a creative approach for pragmatic occlusion stress prediction.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Development of a biomechanical model for dynamic occlusal stress analysis

et al. 2021

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“…A more complete correction of the worn dentition may be necessary. The excessive elongation of the mandibular third molar has some effect on the chewing pattern, but this effect is limited in terms of symptoms [9] . -86-confirmed that the occlusal impact force required by patients with third molar elongation was larger than that of patients with normal occlusion when chewing the same food.…”

Section: Malocclusion Caused By Third Molar Elongationmentioning

confidence: 99%

The influence of over-erupted third molar on the temporomandibular joint and related imaging research

2023

FMSR

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Among the causes of temporomandibular disorders, occlusal factors have long been considered to play an important role in the occurrence and development of temporomandibular disorders, in which the third molar is extended to form intrusive contact with the opposite second molar, which is common in clinical practice and often accompanied by the symptoms and signs of TMD. This article briefly reviews the effect of third molar elongation on the morphology of temporomandibular joint.

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“…However, removal of the over-erupted mandibular third molar alone is insufficient to correct chewing patterns, and it may be necessary to restore worn-out dentition. The association between the over-erupted tooth and electromyographic findings of muscles in both TMD and non-TMD individuals suggests a need for a clinical trial on the extraction of over-erupted teeth [ 19 ]. A study among 31 young adults with TMD found a significant association between premature contacts, occlusal stability, and TMD [ 20 ].…”

Section: Introductionmentioning

confidence: 99%

The Role of Supraerupted and Distoverted Maxillary Third Molars in the Treatment of Temporomandibular Disorder: A Randomised Controlled Trial

Gururaj,

Subramaniyan,

Hasinidevi

et al. 2023

Cureus

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Objective Temporomandibular disorder (TMD) is a multifactorial disease that is classified into muscular and joint disorders. The etiology of TMD is unknown but it is related to various factors such as bruxism, uncorrected high dental restorations, and occlusal prematurities. This study aims to provide treatment modalities for TMD patients with supraerupted and/or distoverted maxillary third molars that have premature contact with the opposing arch. Methods A total of 430 subjects diagnosed with TMD were included in the study and randomized into study and control groups based on their treatment needs. A detailed case history was taken, and findings of intra and extra oral examination were recorded along with other investigations such as study model analysis, orthopantomogram (OPG), cone-beam computed tomography (CBCT), and MRI. The multiphase treatment included counseling in phase I, extraction in phase II (only for the study group), and oral appliance in the third phase. The final phase involved the restoration of edentulous areas or reduced vertical dimension. Results Extraction of supraerupted and/or distoverted maxillary third molars in the study group during phase II showed a 96% reduction in TMD when compared to the control group who did not undergo extraction. Conclusion TMD is a repetitive motion disorder, and the success of treatment relies on the elimination of causative factors, the type of appliance used, and the establishment of ideal occlusion. This study suggests that the extraction of supraerupted and/or distoverted maxillary third molars is a prerequisite for treating TMD patients.

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Interferential effect of the over-erupted third molar on chewing movement

Cited by 4 publications

References 26 publications

Development of a biomechanical model for dynamic occlusal stress analysis

Development of a biomechanical model for dynamic occlusal stress analysis

The influence of over-erupted third molar on the temporomandibular joint and related imaging research

The Role of Supraerupted and Distoverted Maxillary Third Molars in the Treatment of Temporomandibular Disorder: A Randomised Controlled Trial

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