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Maxillomandibular relation

Maxillomandibular relation. Dr. Ali Ehsan Kareem B. D. S., M. Sc./prosthodontist. Methods of recording V.D.R V.D.R is measured usually on the face by a ruler between two selected points on the nose and chin with one of the following methods:

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Maxillomandibular relation

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  1. Maxillomandibular relation Dr. Ali Ehsan Kareem B. D. S., M. Sc./prosthodontist

  2. Methods of recording V.D.R V.D.R is measured usually on the face by a ruler between two selected points on the nose and chin with one of the following methods: 1.Facial measurements after swallowing and relaxing: 2.Tactile sense: 3.Phonetics: 4.Facial expression: 5.Anatomic landmarks:

  3. Methods of recording V.D.O: 1.Mechanical methods: (1)Ridge relation: A)relation of incisive papilla to incisors: B)parallelism of the ridges: (2)Former dentures :

  4. (3)Pre-extraction records: 1.Prophile photograph: 2.Prophile silhouettes: 3.Radiography: 4.Articulated casts: 5.Facial measurements: 2.Physiological methods: • Physiological rest position: • Phonetics and esthetics :

  5. 3.Swallowing threshold: 4.Neuromuscular perception(patient's tactile sense): 5.power point:

  6. Problems of incorrect V.D.OIncreased V.D.O can cause the following problems:1.speech problems.2.sensation of bulky dentures.3.premature contact and clicking during function.4.increased rate of residual ridge resorption.5.T.M.J and muscle pain and fatigue.6.poor esthetic like separated lips and display of the teeth. 7.inability to open the mouth widely.8.loss of biting power. Decreased V.D.O can cause the following problems:1.poor esthetic like unsupported lip, prominence of mandible and chin and presence of excessive wrinkles and folds in corner of mouth which may lead to angular chilitis.2.loss of biting power and decreased chewing ability.3.T.M.J and muscle pain and fatigue.4.cheek biting.5.neuralgia or other features.

  7. Clinical Procedure of maxillomandibular relation record: • establish the V.D.R and record the distance between two points marked on nose and chin by indelible pencil. • the maxillary occlusion rim contoured and the level of the occlusal plane should be determined by fox bite and 2mm below the upper lip. • upper and lower bite rims height should be adjusted until getting of V.D.O approximately (2-4mm) less than the V.D.R.

  8. soften the wax and seat the lower bite rim in the patient mouth and places the index fingers bilaterally on the buccal flanges of the lower record base in second premolar areas or stabilize the denture base by forefinger and thumb of one hand and the thumb of other hand used to guide the mandible. • request the patient to retrude the mandible and close slowly until reaching the V.D.O. • allow the wax to harden for 1-2minute, then remove the assembled occlusion rims together from the mouth as one unite. • the occlusion rims and the casts are mounted on the articulator.

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