Purpose: To evaluate the effect of using digital occlusal splint in the simultaneous treatment of children temporomandibular joint (TMJ) ankylosis with jaw bone deformities.

Methods: Two children with unilateral TMJ ankylosis combined of jaw bone deformities were measured three-dimensionally before surgery by SurgiCase CMF 5.0 software of their CT data. After simulation of bony fusion removal and chin midline correction, digital occlusal splint was made for further costochondral graft which lengthened the affected ramus height. Post-operative CT scan was taken and 3D measurement was made to evaluate the results.

Results: Digital occlusal splint was put in smoothly for the two patients. Post-operative CT showed high fitness with the pre-surgical design.

Conclusion: Digital occlusal splint can save the operation time and improve the accuracy in the simultaneous treatment of children temporomandibular joint ankylosis with jaw bone deformities. It has good prospects for clinical application.