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Diagnostic group differences in temporomandibular joint energy densities


Gallo, L M; Iwasaki, L R; Gonzalez, Y M; Liu, H; Marx, D B; Nickel, J C (2015). Diagnostic group differences in temporomandibular joint energy densities. Orthodontics & craniofacial research, 18 Suppl:164-169.

Abstract

OBJECTIVES Cartilage fatigue, due to mechanical work, may account for precocious development of degenerative joint disease in the temporomandibular joint (TMJ). This study compared energy densities (mJ/mm³) in TMJs of three diagnostic groups. SETTING AND SAMPLE POPULATION Sixty-eight subjects (44 women, 24 men) gave informed consent. Diagnostic criteria for temporomandibular disorders (DC/TMD) and imaging were used to group subjects according to presence of jaw muscle or joint pain (+P) and bilateral disk displacement (+DD). MATERIAL AND METHODS Subjects (+P+DD, n = 16; -P+DD, n = 16; and -P-DD, n = 36) provided cone-beam computed tomography and magnetic resonance images, and jaw-tracking data. Numerical modeling was used to determine TMJ loads (Fnormal ). Dynamic stereometry was used to characterize individual-specific data of stress-field dynamics during 10 symmetrical jaw-closing cycles. These data were used to estimate tractional forces (Ftraction ). Energy densities were then calculated as W/Q (W = work done or mechanical energy input=tractional force × distance of stress-field translation, Q = volume of cartilage). anova and Tukey-Kramer post hoc analyses tested for intergroup differences. RESULTS Mean ± standard error energy density for the +P+DD group was 12.7 ± 1.5 mJ/mm³ and significantly greater (all adjusted p < 0.04) when compared to -P+DD (7.4 ± 1.4 mJ/mm³) and -P-DD (5.8 ± 0.9 mJ/mm³) groups. Energy densities in -P+DD and -P-DD groups were not significantly different. CONCLUSION Diagnostic group differences in energy densities suggest that mechanical work may be a unique mechanism, which contributes to cartilage fatigue in subjects with pain and disk displacement.

OBJECTIVES Cartilage fatigue, due to mechanical work, may account for precocious development of degenerative joint disease in the temporomandibular joint (TMJ). This study compared energy densities (mJ/mm³) in TMJs of three diagnostic groups. SETTING AND SAMPLE POPULATION Sixty-eight subjects (44 women, 24 men) gave informed consent. Diagnostic criteria for temporomandibular disorders (DC/TMD) and imaging were used to group subjects according to presence of jaw muscle or joint pain (+P) and bilateral disk displacement (+DD). MATERIAL AND METHODS Subjects (+P+DD, n = 16; -P+DD, n = 16; and -P-DD, n = 36) provided cone-beam computed tomography and magnetic resonance images, and jaw-tracking data. Numerical modeling was used to determine TMJ loads (Fnormal ). Dynamic stereometry was used to characterize individual-specific data of stress-field dynamics during 10 symmetrical jaw-closing cycles. These data were used to estimate tractional forces (Ftraction ). Energy densities were then calculated as W/Q (W = work done or mechanical energy input=tractional force × distance of stress-field translation, Q = volume of cartilage). anova and Tukey-Kramer post hoc analyses tested for intergroup differences. RESULTS Mean ± standard error energy density for the +P+DD group was 12.7 ± 1.5 mJ/mm³ and significantly greater (all adjusted p < 0.04) when compared to -P+DD (7.4 ± 1.4 mJ/mm³) and -P-DD (5.8 ± 0.9 mJ/mm³) groups. Energy densities in -P+DD and -P-DD groups were not significantly different. CONCLUSION Diagnostic group differences in energy densities suggest that mechanical work may be a unique mechanism, which contributes to cartilage fatigue in subjects with pain and disk displacement.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:04 Faculty of Medicine > Center for Dental Medicine > Clinic for Masticatory Disorders and Complete Dentures, Geriatric and Special Care Dentistry
Dewey Decimal Classification:610 Medicine & health
Language:English
Date:April 2015
Deposited On:16 Apr 2015 09:01
Last Modified:05 Apr 2016 19:13
Publisher:Wiley-Blackwell Publishing, Inc.
ISSN:1601-6335
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1111/ocr.12074
PubMed ID:25865545
Permanent URL: https://doi.org/10.5167/uzh-110309

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