PMID- 12821714
OWN - NLM
STAT- MEDLINE
DCOM- 20030728
LR  - 20170214
IS  - 0022-0345 (Print)
IS  - 0022-0345 (Linking)
VI  - 82
IP  - 7
DP  - 2003 Jul
TI  - Occlusal and TMJ loads in subjects with experimentally shortened dental arches.
PG  - 532-6
AB  - To determine whether shortened dental arches (SDAs) cause functional overloading 
      of the teeth and the temporomandibular joints, which has been implicated in 
      periodontal diseases and temporomandibular disorders, we investigated the 
      influences of SDA on occlusal and joint loads. Bite force and masticatory muscle 
      electromyograms were recorded in five dentate subjects who clenched maximally on 
      intra-oral appliances, creating symmetrical SDAs experimentally. Muscular forces 
      estimated from the recorded electromyograms were fed into a finite element jaw 
      model for calculating bite forces and joint loads. Comparison between the 
      measured and the calculated bite forces ensured that the joint loads were 
      representative. The bite force on each tooth increased with missing molar 
      occlusions, while joint loads decreased. The bite force per root surface area was 
      always greatest on the most posterior tooth, and these values were most constant. 
      The findings provide no evidence that SDA causes overloading of the joints and 
      the teeth, which suggests that neuromuscular regulatory systems are controlling 
      maximum clenching strength under various occlusal conditions.
FAU - Hattori, Y
AU  - Hattori Y
AD  - Department of Aging and Geriatric Dentistry, Tohoku University Graduate School of 
      Dentistry, 4-1 Seiryo-machi, Aoba-ku, Sendai, 980-8575, Japan. 
      yhattori@mail.cc.tohoku.ac.jp
FAU - Satoh, C
AU  - Satoh C
FAU - Seki, S
AU  - Seki S
FAU - Watanabe, Y
AU  - Watanabe Y
FAU - Ogino, Y
AU  - Ogino Y
FAU - Watanabe, M
AU  - Watanabe M
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
PL  - United States
TA  - J Dent Res
JT  - Journal of dental research
JID - 0354343
SB  - IM
MH  - Adaptation, Physiological
MH  - Adult
MH  - Analysis of Variance
MH  - *Bite Force
MH  - Computer Simulation
MH  - Dental Arch/physiopathology
MH  - Dental Stress Analysis/*methods
MH  - Electromyography
MH  - Finite Element Analysis
MH  - Humans
MH  - Jaw, Edentulous, Partially/*physiopathology
MH  - Male
MH  - Masticatory Muscles/physiology
MH  - Molar/physiology
MH  - Muscle Contraction
MH  - Occlusal Splints
MH  - Temporomandibular Joint/*physiopathology
EDAT- 2003/06/25 05:00
MHDA- 2003/07/29 05:00
CRDT- 2003/06/25 05:00
PHST- 2003/06/25 05:00 [pubmed]
PHST- 2003/07/29 05:00 [medline]
PHST- 2003/06/25 05:00 [entrez]
AID - 10.1177/154405910308200709 [doi]
PST - ppublish
SO  - J Dent Res. 2003 Jul;82(7):532-6. doi: 10.1177/154405910308200709.