Jaw Relations – methods of recording vertical jaw relations 9m #NTRUHS

TYPES OF JAW RELATIONS = this is order of recording 1- 3 

  1. Orientation 
  2. Vertical 
  3. Horizontal
    1. Eccentric = lateral and protrusive 
    2. Centric = recorded last as rims are sealed
  1. How to record VDR? 2M*
    1. Measuring after swallowing and relaxing = tapes on nose and chin
    2. Tactile sense = ask pt to open his mouth at maxium and close the mouth slowly to a rest position = hence, all the muscles will be active
    3. Anatomical Landmarks 
      1. Distance between pupil of eye and rima oris 
      2. Anterior nasal spine and lower border of mandible 
      3. If A = B 
    4. Speech = 
      1. Words ending with M = eg Ram 
      2. Given by Schlossler  
      3. When you pronuch M = lips close 
      4. VDR is more = pt has to keep more effort to bring lips together to say M 
    5. Facial expressions 
    6. Patient position for recording at VDR
      1. Head straight 
      2. Upright position 
      3. Reid base line is parallel to the floor while recording vertical jaw relation 
      4. Draw
  2. How to record VDO? 2M*
    1. Measured when pt is in centric relation 
    2. Mechanical methods
      1. Checking ridge relation 
        1. Distance between incisive papilla to mandibular incisior = 8 mm 
        2. Distance between incisive papilla to maxillary incisior = 6 mm + 2mm overbite
      2. Prextration records = BEST METHOD = Its a model of original VD 
      3. Existing denture 
    3. Physiological method 3m
      1. Given by NISWONGER and THOMSON = 1934
      2. Ask the pt to relax after placing rims in the pt mouth  = This is static method
      3. In this method, two markings are made, one on the upper lip below the nasal septum, and the other on the chin. 
      4. The patient is told to swallow and relax. 
      5. The distance between the marks is measured. 
      6. The occlusal rims are adjusted, until the distance between the marks is 2–4 mm less during occlusion. 
      7. Disadvantage: The marks move with the skin. 
    4. Phonetics 
      1. Ask the pt to prounch S or FVS eg 55 
      2. Given by silverman 
      3. This is called closest speaking space = 2mm 
      4. This is recorded in DYNAMIC position when pt is speaking 
      5. FVS sounds = speaking anterior tooth realtion = given by pound and murrell – without recording VD and set up your anterior teeth based on prouncing FVS

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s