Quantification of masseter muscle deformation during palpation using MRI and image-analysis procedure

Citation
M. Ishikawa et al., Quantification of masseter muscle deformation during palpation using MRI and image-analysis procedure, INT J PROST, 14(4), 2001, pp. 367-373
Citations number
56
Categorie Soggetti
Dentistry/Oral Surgery & Medicine
Journal title
INTERNATIONAL JOURNAL OF PROSTHODONTICS
ISSN journal
08932174 → ACNP
Volume
14
Issue
4
Year of publication
2001
Pages
367 - 373
Database
ISI
SICI code
0893-2174(200107/08)14:4<367:QOMMDD>2.0.ZU;2-O
Abstract
Purpose: The aim of this study was to quantify masseter muscle deformation during palpation and to discuss the clinical significance of muscle palpati on using magnetic resonance imaging (MRI) and the image-analysis procedure. Materials and Methods: Subjects were 10 male volunteers with a mean age of 26.8 years. MRIs were taken under two muscle conditions: compressed and no ncompressed (control). By superimposing a compressed image on a noncompress ed image, muscle deformation (the cross-sectional area, length of the surro unding area, thickness, circular convolution, compressed point, and anterio r and posterior extension) was measured. Results: The cross-sectional area of the masseter muscle was diminished by 14%, circular convolution of the m uscle was reduced by 31%, the length of the surrounding area was enlarged b y 11%, and the thickness of the muscle was reduced by 6.7 mm because of com pressing. Thus, the masseter muscle was compressed. An uneven stretch of th e muscle caused by compression was observed at the same time. The anterior portion of the masseter muscles extended on average 10%, with great individ ual differences. On the other hand, posterior extension (3%) and its indivi dual differences were small. Conclusion: The method used made it possible t o quantify masseter muscle deformation. By compressing, the masseter muscle s were deformed especially in the anterior direction but with great individ ual differences.