A pilot study of ambulatory masticatory muscle activities in temporomandibular joint disorders diagnostic groups

Laura Iwasaki, Y. M. Gonzalez, H. Liu, D. B. Marx, L. M. Gallo, Jeffrey Nickel

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Objective: To determine differences in masticatory muscle usage between temporomandibular joint disorders diagnostic groups. Setting and sample population: Seventy-one informed and consented subjects (27 men; 44 women) participated at the University at Buffalo. Material and methods: Research diagnostic criteria and imaging data were used to categorize subjects according to the presence/absence (+/-) of TMJ disc placement (DD) and chronic pain (P) (+DD+P, n = 18; +DD-P, n = 14; -DD-P, n = 39). Electromyographic (EMG)/bite-force calibrations determined subject-specific masseter and temporalis muscle activities per 20 N bite-force (T20N, μV). Over 3 days and nights, subjects collected EMG recordings. Duty factors (DFs, % of recording time) were determined based on threshold intervals (5-9, 10-24, 25-49, 50-79, ≥80% T20N). anova and Tukey-Kramer post hoc tests identified 1) diagnostic group differences in T20N and 2) the effects of diagnostic group, gender, time and interval on muscle DFs. Results: Mean (± SE) temporalis T20N in +DD+P subjects was significantly higher (71.4 ± 8.8 μV) than masseter T20N in these subjects (19.6 ± 8.8 μV; p = 0.001) and in -DD-P subjects (25.3 ± 6.0 μV, p = 0.0007). Masseter DFs at 5-9% T20N were significantly higher in +DD-P women (3.48%) than +DD-P men (0.85%) and women and men in both other diagnostic groups (all p < 0.03), and in +DD+P women (2.00%) compared to -DD-P men (0.83%; p = 0.029). Night-time DFs at 5-9% T20N in +DD-P women (1.97%) were significantly higher than in -DD-P men (0.47%) and women (0.24%; all p < 0.01). Conclusions: Between-group differences were found in masticatory muscle activities in both laboratory and natural environmental settings.

Original languageEnglish (US)
Pages (from-to)146-155
Number of pages10
JournalOrthodontics and Craniofacial Research
Volume18
Issue numberS1
DOIs
StatePublished - Jan 1 2015
Externally publishedYes

Fingerprint

Masticatory Muscles
Temporomandibular Joint Disorders
Bite Force
Masseter Muscle
Buffaloes
Temporomandibular Joint
Diagnostic Imaging
Chronic Pain
Calibration
Muscles
Research
Population

Keywords

  • Ambulatory
  • Duty factor
  • Electromyographic
  • Masticatory muscle
  • Temporomandibular joint disorder

ASJC Scopus subject areas

  • Orthodontics
  • Surgery
  • Oral Surgery
  • Otorhinolaryngology

Cite this

A pilot study of ambulatory masticatory muscle activities in temporomandibular joint disorders diagnostic groups. / Iwasaki, Laura; Gonzalez, Y. M.; Liu, H.; Marx, D. B.; Gallo, L. M.; Nickel, Jeffrey.

In: Orthodontics and Craniofacial Research, Vol. 18, No. S1, 01.01.2015, p. 146-155.

Research output: Contribution to journalArticle

@article{a9abddb134de457ba9e0a696ea976407,
title = "A pilot study of ambulatory masticatory muscle activities in temporomandibular joint disorders diagnostic groups",
abstract = "Objective: To determine differences in masticatory muscle usage between temporomandibular joint disorders diagnostic groups. Setting and sample population: Seventy-one informed and consented subjects (27 men; 44 women) participated at the University at Buffalo. Material and methods: Research diagnostic criteria and imaging data were used to categorize subjects according to the presence/absence (+/-) of TMJ disc placement (DD) and chronic pain (P) (+DD+P, n = 18; +DD-P, n = 14; -DD-P, n = 39). Electromyographic (EMG)/bite-force calibrations determined subject-specific masseter and temporalis muscle activities per 20 N bite-force (T20N, μV). Over 3 days and nights, subjects collected EMG recordings. Duty factors (DFs, {\%} of recording time) were determined based on threshold intervals (5-9, 10-24, 25-49, 50-79, ≥80{\%} T20N). anova and Tukey-Kramer post hoc tests identified 1) diagnostic group differences in T20N and 2) the effects of diagnostic group, gender, time and interval on muscle DFs. Results: Mean (± SE) temporalis T20N in +DD+P subjects was significantly higher (71.4 ± 8.8 μV) than masseter T20N in these subjects (19.6 ± 8.8 μV; p = 0.001) and in -DD-P subjects (25.3 ± 6.0 μV, p = 0.0007). Masseter DFs at 5-9{\%} T20N were significantly higher in +DD-P women (3.48{\%}) than +DD-P men (0.85{\%}) and women and men in both other diagnostic groups (all p < 0.03), and in +DD+P women (2.00{\%}) compared to -DD-P men (0.83{\%}; p = 0.029). Night-time DFs at 5-9{\%} T20N in +DD-P women (1.97{\%}) were significantly higher than in -DD-P men (0.47{\%}) and women (0.24{\%}; all p < 0.01). Conclusions: Between-group differences were found in masticatory muscle activities in both laboratory and natural environmental settings.",
keywords = "Ambulatory, Duty factor, Electromyographic, Masticatory muscle, Temporomandibular joint disorder",
author = "Laura Iwasaki and Gonzalez, {Y. M.} and H. Liu and Marx, {D. B.} and Gallo, {L. M.} and Jeffrey Nickel",
year = "2015",
month = "1",
day = "1",
doi = "10.1111/ocr.12085",
language = "English (US)",
volume = "18",
pages = "146--155",
journal = "Orthodontics and Craniofacial Research",
issn = "1601-6335",
publisher = "Wiley-Blackwell",
number = "S1",

}

TY - JOUR

T1 - A pilot study of ambulatory masticatory muscle activities in temporomandibular joint disorders diagnostic groups

AU - Iwasaki, Laura

AU - Gonzalez, Y. M.

AU - Liu, H.

AU - Marx, D. B.

AU - Gallo, L. M.

AU - Nickel, Jeffrey

PY - 2015/1/1

Y1 - 2015/1/1

N2 - Objective: To determine differences in masticatory muscle usage between temporomandibular joint disorders diagnostic groups. Setting and sample population: Seventy-one informed and consented subjects (27 men; 44 women) participated at the University at Buffalo. Material and methods: Research diagnostic criteria and imaging data were used to categorize subjects according to the presence/absence (+/-) of TMJ disc placement (DD) and chronic pain (P) (+DD+P, n = 18; +DD-P, n = 14; -DD-P, n = 39). Electromyographic (EMG)/bite-force calibrations determined subject-specific masseter and temporalis muscle activities per 20 N bite-force (T20N, μV). Over 3 days and nights, subjects collected EMG recordings. Duty factors (DFs, % of recording time) were determined based on threshold intervals (5-9, 10-24, 25-49, 50-79, ≥80% T20N). anova and Tukey-Kramer post hoc tests identified 1) diagnostic group differences in T20N and 2) the effects of diagnostic group, gender, time and interval on muscle DFs. Results: Mean (± SE) temporalis T20N in +DD+P subjects was significantly higher (71.4 ± 8.8 μV) than masseter T20N in these subjects (19.6 ± 8.8 μV; p = 0.001) and in -DD-P subjects (25.3 ± 6.0 μV, p = 0.0007). Masseter DFs at 5-9% T20N were significantly higher in +DD-P women (3.48%) than +DD-P men (0.85%) and women and men in both other diagnostic groups (all p < 0.03), and in +DD+P women (2.00%) compared to -DD-P men (0.83%; p = 0.029). Night-time DFs at 5-9% T20N in +DD-P women (1.97%) were significantly higher than in -DD-P men (0.47%) and women (0.24%; all p < 0.01). Conclusions: Between-group differences were found in masticatory muscle activities in both laboratory and natural environmental settings.

AB - Objective: To determine differences in masticatory muscle usage between temporomandibular joint disorders diagnostic groups. Setting and sample population: Seventy-one informed and consented subjects (27 men; 44 women) participated at the University at Buffalo. Material and methods: Research diagnostic criteria and imaging data were used to categorize subjects according to the presence/absence (+/-) of TMJ disc placement (DD) and chronic pain (P) (+DD+P, n = 18; +DD-P, n = 14; -DD-P, n = 39). Electromyographic (EMG)/bite-force calibrations determined subject-specific masseter and temporalis muscle activities per 20 N bite-force (T20N, μV). Over 3 days and nights, subjects collected EMG recordings. Duty factors (DFs, % of recording time) were determined based on threshold intervals (5-9, 10-24, 25-49, 50-79, ≥80% T20N). anova and Tukey-Kramer post hoc tests identified 1) diagnostic group differences in T20N and 2) the effects of diagnostic group, gender, time and interval on muscle DFs. Results: Mean (± SE) temporalis T20N in +DD+P subjects was significantly higher (71.4 ± 8.8 μV) than masseter T20N in these subjects (19.6 ± 8.8 μV; p = 0.001) and in -DD-P subjects (25.3 ± 6.0 μV, p = 0.0007). Masseter DFs at 5-9% T20N were significantly higher in +DD-P women (3.48%) than +DD-P men (0.85%) and women and men in both other diagnostic groups (all p < 0.03), and in +DD+P women (2.00%) compared to -DD-P men (0.83%; p = 0.029). Night-time DFs at 5-9% T20N in +DD-P women (1.97%) were significantly higher than in -DD-P men (0.47%) and women (0.24%; all p < 0.01). Conclusions: Between-group differences were found in masticatory muscle activities in both laboratory and natural environmental settings.

KW - Ambulatory

KW - Duty factor

KW - Electromyographic

KW - Masticatory muscle

KW - Temporomandibular joint disorder

UR - http://www.scopus.com/inward/record.url?scp=84926509866&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84926509866&partnerID=8YFLogxK

U2 - 10.1111/ocr.12085

DO - 10.1111/ocr.12085

M3 - Article

VL - 18

SP - 146

EP - 155

JO - Orthodontics and Craniofacial Research

JF - Orthodontics and Craniofacial Research

SN - 1601-6335

IS - S1

ER -