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Stress distribution in the temporomandibular joint after mandibular protraction: a 3-dimensional finite element study. Part 2.
Am J Orthod Dentofacial Orthop 2009; 135(6):749-56AJ

Abstract

INTRODUCTION

Patterns of stress generation in the temporomandibular joint (TMJ) after mandibular protraction with a construction bite of 5 mm advancement and 4 mm opening were investigated by using a 3-dimensional finite element method; the results were reported in Part 1. In Part 2, the effects of varying the construction bite are reported.

METHODS

A 3-dimensional computer-aided design model was developed from the magnetic resonance images of a growing boy (age, 12 years), by using I-DEAS NX (version 11.0, Siemens PLM Software, Plano, Tex). Sagittal advancement was 5 mm, as in Part 1; however, the vertical openings of the construction bite were changed from 4 mm to 2 and 6 mm. The stresses thus obtained were compared for differences in magnitude and pattern.

RESULTS

Tensile stresses migrated more posteriorly on the condylar head with increased bite height. The locations of the tensile stresses in the glenoid fossa were similar in all simulations. The TMJ as a whole showed increased loading with the increasing vertical openings.

CONCLUSIONS

This study indicates that increasing the construction bite height might give more favorable stress patterns in the TMJ, thereby improving the condylar response to functional appliances. The findings of this preliminary study need to be investigated in an animal model and in humans before deriving clinical implications.

Authors+Show Affiliations

Department of Orthodontics, Center for Dental Education and Research, All India Institute of Medical Sciences, New Delhi, India. dranuragg.ortho@gmail.comNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Comparative Study
Journal Article

Language

eng

PubMed ID

19524834

Citation

Gupta, Anurag, et al. "Stress Distribution in the Temporomandibular Joint After Mandibular Protraction: a 3-dimensional Finite Element Study. Part 2." American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics, vol. 135, no. 6, 2009, pp. 749-56.
Gupta A, Hazarey PV, Kharbanda OP, et al. Stress distribution in the temporomandibular joint after mandibular protraction: a 3-dimensional finite element study. Part 2. Am J Orthod Dentofacial Orthop. 2009;135(6):749-56.
Gupta, A., Hazarey, P. V., Kharbanda, O. P., Kohli, V. S., & Gunjal, A. (2009). Stress distribution in the temporomandibular joint after mandibular protraction: a 3-dimensional finite element study. Part 2. American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics, 135(6), pp. 749-56. doi:10.1016/j.ajodo.2007.12.026.
Gupta A, et al. Stress Distribution in the Temporomandibular Joint After Mandibular Protraction: a 3-dimensional Finite Element Study. Part 2. Am J Orthod Dentofacial Orthop. 2009;135(6):749-56. PubMed PMID: 19524834.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Stress distribution in the temporomandibular joint after mandibular protraction: a 3-dimensional finite element study. Part 2. AU - Gupta,Anurag, AU - Hazarey,Pushpa V, AU - Kharbanda,Om P, AU - Kohli,Virender S, AU - Gunjal,Amit, PY - 2007/07/20/received PY - 2007/12/20/revised PY - 2007/12/20/accepted PY - 2009/6/16/entrez PY - 2009/6/16/pubmed PY - 2009/7/23/medline SP - 749 EP - 56 JF - American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics JO - Am J Orthod Dentofacial Orthop VL - 135 IS - 6 N2 - INTRODUCTION: Patterns of stress generation in the temporomandibular joint (TMJ) after mandibular protraction with a construction bite of 5 mm advancement and 4 mm opening were investigated by using a 3-dimensional finite element method; the results were reported in Part 1. In Part 2, the effects of varying the construction bite are reported. METHODS: A 3-dimensional computer-aided design model was developed from the magnetic resonance images of a growing boy (age, 12 years), by using I-DEAS NX (version 11.0, Siemens PLM Software, Plano, Tex). Sagittal advancement was 5 mm, as in Part 1; however, the vertical openings of the construction bite were changed from 4 mm to 2 and 6 mm. The stresses thus obtained were compared for differences in magnitude and pattern. RESULTS: Tensile stresses migrated more posteriorly on the condylar head with increased bite height. The locations of the tensile stresses in the glenoid fossa were similar in all simulations. The TMJ as a whole showed increased loading with the increasing vertical openings. CONCLUSIONS: This study indicates that increasing the construction bite height might give more favorable stress patterns in the TMJ, thereby improving the condylar response to functional appliances. The findings of this preliminary study need to be investigated in an animal model and in humans before deriving clinical implications. SN - 1097-6752 UR - https://www.unboundmedicine.com/medline/citation/19524834/Stress_distribution_in_the_temporomandibular_joint_after_mandibular_protraction:_a_3_dimensional_finite_element_study__Part_2_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0889-5406(09)00159-0 DB - PRIME DP - Unbound Medicine ER -