الفهرس 
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Abstract
The current study was conducted to evaluate the efficiency of two cutting
instruments for treatment of TMJ ID arthroscopically. The study was designed to be a
prospective randomized double blinded trial. Patient’s examination and evaluation were
performed by utilizing the RDC/TMD in order to standardize the diagnostic criteria and
the method of assessment. Twelve joints were enrolled in our study, randomized equally
in to two groups. group I disc release performed by electrocautery probe, however the
other group disc release performed by radiofrequency ablation wand. The follow-up
period was assigned to be 1, 2, 4 & 8 weeks.
The results of our study revealed significant decrease of pain score in favor of
coblation group along the whole follow up period. Moreover, clicking sounds also
disappear but non-significantly. Whereas, the mouth opening either assisted or nonassisted
showed gradual increase in both groups from the 2 weeks postoperatively up to 2
month but did not reach a significant level. Histological assessment in the current study
showed that mean value of apoptotic cells and the percentage of apoptotic cells were
decreased significantly in favor of COB group.
So that; we can conclude that coblation has less harm effect on TMJ disc
histologically than electrocautery and clinically reduce pain postoperative.