The group which applied the 2 mm thick stabilization splint

The group which applied the 4 mm thick stabilization splint

Stabilization splint is an appliance which applied to upper or lower jaw and regulating the occlusal forces in the temporomandibular joint that can cause disorders, also preventing excessive contraction of the masticatory muscles

Myofascial pain and myofascial pain with limited opening are in the Group I according to the RDC/TMD.

I.a Myofascial pain:

1. Reported pain in masticatory muscles (In the jaw, temples, face, preauricular area, or inside the ear, at rest or function)
2. Pain on palpation in at least 3 sites (There are 20 sites (ten on each side): posterior, middle and anterior Temporalis; origin, body and insertion of Masseter; posterior mandibular region; Submandibular region; lateral Pterygoid; tendon of Temporalis), one of them at least in the same side of the reported pain

I.b Myofascial pain with limited opening:

1. Myofascial pain
2. Pain-free unassisted 3 opening< 40 mm and Passive 4 stretch ≥ 5 mm

II.a Disc displacement with reduction:

1. No pain in the joint

2. Reproducible (All clicks must be reproduced 2 out of 3 consecutive trials) click on excursion with either opening or closing click

3. With click on opening and closing (unless excursive click confirmed):

   • Click on opening occurs at ≥ 5 mm interincisal distance than on closing
   • Clicks eliminated by protrusive opening

II.b Disc displacement without reduction with limited opening:

1. History of locking or catching that interfered with eating
2. Absence of TMJ clicking
3. Unassisted opening (even painful) ≤ 35mm and passive stretch ≤ 4mm
4. Contralateral excursion < 7mm

II.c Disc displacement without reduction without limited opening:

1. History of locking or catching that interfered with eating
2. The presence of TMJ sounds excluding DDR clicking
3. Unassisted opening (even painful) > 35mm and passive stretch > 4mm
4. Contralateral excursion ≥ 7mm

Click: A distinct sound, of brief and very limited duration, with a clear beginning and end, which usually sounds like a "click."

Opening Click: If upon opening and closing from maximum intercuspation, a click is noted on two of three opening movements, record as positive for opening click.

Closing Click: A click present on two of three closing mandibular movements.