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Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 2010 Aug;110(2):167-71. doi: 10.1016/j.tripleo.2009.12.036. Epub 2010 Apr 9.

Topography of the masseter muscle in relation to treatment with botulinum toxin type A.

Author information

1
Division in Anatomy and Developmental Biology, Department of Oral Biology, Yonsei University College of Dentistry, Seoul, Korea.

Abstract

OBJECTIVE:

The objective of this study was to provide the safest and most efficient site for injection of botulinum toxin type A into the masseter muscle.

STUDY DESIGN:

This study was performed on 40 hemifaces from cadavers. The surface of the masseter was compartmentalized into areas I to VIII. Areas I, III, V, and VII were assigned to represent the upper 4 compartments from the posterior aspect of each muscle, and areas II, IV, VI, and VIII were assigned to represent the lower 4 compartments.

RESULTS:

The parotid gland usually covered compartments I and II, and the marginal mandibular branch of the facial nerve was located a mean of 7.4 mm above the inferior mandibular margin. The parotid duct was usually located above the reference line connecting the tragus and the cheilion.

CONCLUSION:

The center of compartment VI is the safest and most efficient injection site for botulinum toxin type A into the masseter muscle.

PMID:
20382049
DOI:
10.1016/j.tripleo.2009.12.036
[Indexed for MEDLINE]

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