Bruxism is an oral habit consisting of involuntary non-functional gnashing, clenching, grinding of teeth and is a very common condition in the general population. Various treatment modalities such as occlusal splints, pharmacologic agent and cognitive-behavioral therapy have been investigated for the management of bruxism, but none is reported to be fully effective. Recently locally injected botulinum toxin has been used in various movement disorders, but its usefulness and objective effects on nocturnal bruxism have not been evaluated using objective measures such as polysomnography. Moreover, there is no systematic study about which site is most appropriate for injection to obtain maximal effects.~The aim of this study is to evaluate the effect of botulinum toxin type A into masseter muscle or both masseter muscle and temporal muscle on nocturnal bruxism using polysomnography and the changes in the bruxism events on polysomnography.
The purpose of this study is to evaluate the effect of Botulinum toxin type A(Meditoxin®) on bruxism using polysomnography and determine which site is most appropriate for injection to obtain maximal effects.