PMID- 10502902
OWN - NLM
STAT- MEDLINE
DCOM- 19991004
LR  - 20190513
IS  - 0141-5387 (Print)
IS  - 0141-5387 (Linking)
VI  - 21
IP  - 4
DP  - 1999 Aug
TI  - Sensory and motor changes of the human jaw muscles during induced orthodontic 
      pain.
PG  - 397-404
AB  - The aim of this study was to evaluate the short-term effects of orthodontic pain 
      on the pressure pain threshold (PPT) of the masseter and anterior temporalis 
      muscles, and on their electromyographic (EMG) activity during clenching and 
      chewing. Orthodontic pain was induced in 14 healthy subjects (mean age 26.6, SEM 
      1.1) by placing orthodontic separators. The subjects were randomly assigned to an 
      experimental and to a control session in a double-blind crossover study. PPT was 
      significantly reduced (Student's t-test; P < 0.001) after experimental sessions 
      for both the masseter and the anterior temporalis muscles, whereas no significant 
      differences were found during control sessions (P > 0.05). EMG activity during 
      clenching and chewing was significantly reduced (0.001 < or = P < 0.05) after 
      experimental sessions for both masseter and anterior temporalis muscles, whereas 
      no significant differences were found during control sessions (P > 0.05). The 
      decrease of PPT found in this study can be related to the occurrence of muscle 
      pain and headache reported by patients during orthodontic or other dental 
      treatment. The decrease of EMG activity of the jaw muscles associated with 
      orthodontic pain is consistent with the pain adaptation model and should be 
      considered as a potential factor for loss of occlusal anchorage during 
      orthodontic treatment.
FAU - Michelotti, A
AU  - Michelotti A
AD  - Department of Orthodontics, University of Naples, Italy.
FAU - Farella, M
AU  - Farella M
FAU - Martina, R
AU  - Martina R
LA  - eng
PT  - Clinical Trial
PT  - Journal Article
PT  - Randomized Controlled Trial
PT  - Research Support, Non-U.S. Gov't
PT  - Review
PL  - England
TA  - Eur J Orthod
JT  - European journal of orthodontics
JID - 7909010
SB  - IM
MH  - Adult
MH  - Animals
MH  - Cross-Over Studies
MH  - Double-Blind Method
MH  - Female
MH  - Humans
MH  - Male
MH  - Orthodontic Appliances/*adverse effects
MH  - Pain/*etiology/physiopathology
MH  - Rats
RF  - 37
EDAT- 1999/09/30 00:00
MHDA- 1999/09/30 00:01
CRDT- 1999/09/30 00:00
PHST- 1999/09/30 00:00 [pubmed]
PHST- 1999/09/30 00:01 [medline]
PHST- 1999/09/30 00:00 [entrez]
AID - 10.1093/ejo/21.4.397 [doi]
PST - ppublish
SO  - Eur J Orthod. 1999 Aug;21(4):397-404. doi: 10.1093/ejo/21.4.397.