Comparison of silastic and acrylic interpositioning for the treatment of temporomandibular joint ankylosis

ABSTRACT

The aim of this study was to compare the treatment outcome of thirty unilateral temporomandibular joint [TMJ] ankylosis cases treated in Pakistan Institute of Medical Sciences [PIMS], Islamabad within four years by either silastic or acrylic interpositional arthoplasty. Patients having bilateral TMJ ankylosis, age less than 16 years, coronoidectomy required during procedure, already operated cases and medically compromised patients were excluded from the study. Pre and post-operative assessment was done by thorough history, physical examination and radiographic evaluation [OPG and CT scan] to determine the cause of ankylosis, the maximal inter-incisal opening, complications including infection, presence of facial nerve paralysis and recurrence rate. The maximal inter-incisal opening in the pre-operative period ranged from 0-11mm and was recorded at a mean of 32.7+/-5.8mm for cases treated with silastic interposition and 29.5+/-6.8mm for the ones treated with acrylic one year after surgery. Infections, swelling, pain and nerve injuries were reported in both the groups post-operatively. Both silastic and acrylic were found to be statistically similar in terms of maximal inter-incisal opening, complications and recurrence rates. Recurrence was observed in only one patient treated by acrylic inter-positioning. Silastic however demonstrated itself to be a better choice in terms of handling and patient tolerability