Bone changes in the mandible following botulinum neurotoxin injections

Chi Yang Tsai, Yi Ming Shyr, Wan Chi Chiu, Chi Ming Lee

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

In this study, botulinum neurotoxin type A (BoTx/A) was injected into the temporalis and masseter muscles of growing rats to induce masticatory hypoactivity. Sixty, 30-day-old, male Long-Evans rats were randomly divided into four groups. BoTx/A was bilaterally injected in the masseter muscles in group I, in the temporalis muscles in group II, and into both the masseter and the temporalis muscles in group III. Group IV served as the control in which saline was bilaterally injected into both muscles. Forty-five days after the injections, the rats were sacrificed. Observation of cortical bone thickness from bone biopsies of the right halves of the mandibles, evaluation of the volume of masseter and temporalis muscles with a plethysmometer, and scanning of bone mineral density (BMD) of the skull and mandibular bone structure with dual-energy X-ray absorptiometry were performed. One-way analysis of variance was employed to analyse measurements of muscle volume, BMD, and cortical bone thickness among the groups. The least square difference was then used to determine significance. Reduced cortical bone thickness and BMD of the skull and mandibular bone structure were observed. The volumes of the temporalis and masseter muscles injected with BoTx/A were smaller. Masticatory hypofunction affects bone structure during development.

Original languageEnglish
Pages (from-to)132-138
Number of pages7
JournalEuropean Journal of Orthodontics
Volume33
Issue number2
DOIs
Publication statusPublished - Apr 2011

Fingerprint

Masseter Muscle
Neurotoxins
Mandible
Bone and Bones
Injections
Bone Density
Skull
Muscles
Long Evans Rats
Type A Botulinum Toxins
Photon Absorptiometry
Least-Squares Analysis
Analysis of Variance
Observation
Biopsy
Cortical Bone

ASJC Scopus subject areas

  • Orthodontics

Cite this

Bone changes in the mandible following botulinum neurotoxin injections. / Tsai, Chi Yang; Shyr, Yi Ming; Chiu, Wan Chi; Lee, Chi Ming.

In: European Journal of Orthodontics, Vol. 33, No. 2, 04.2011, p. 132-138.

Research output: Contribution to journalArticle

Tsai, Chi Yang ; Shyr, Yi Ming ; Chiu, Wan Chi ; Lee, Chi Ming. / Bone changes in the mandible following botulinum neurotoxin injections. In: European Journal of Orthodontics. 2011 ; Vol. 33, No. 2. pp. 132-138.
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