Jaw relation

Occlusal plane orientation Its the average plane established by the incisal and occlusal surfaces of the teeth Aesthetics: The height of occlusal plane 1-2mm below the upper lip. The anterior part should be parallel to the inter-pupillary line. The posterior part should be parallel to the alla-tragus line. Function: Phonetics: V, F, PH sounds (incisal edge of maxillary anterior in light contact with lower lip). Chewing: Height of occlusal plane slightly below the greatest convexity of tongue.

3. Parallesim The occlusal plane should be parallel to both supporting ridges (biting forces are vertical to the ridges) 4. Anatomical factors

Cranio-maxillary orientation The relationship between the maxilla and TMJ or cranium. This will be done either following Bonewill triangle with mean value articulators or by using face bow transfer with adjustable articulators. FACE AND EAR BOW A device used to record the relationship between the maxilla and T.M.J (orientation relation) and transfer this relation to the articulator.

Vertical jaw relation Vertical dimension the artificial denture should be given same vertical relation for good function and to provide comfort to the patient, so Vertical relation establishes the amount of jaw separation (dimension) allowable for dentures. Vertical dimension A vertical measurement of the face between any two arbitrarily selected points one above and one below the mouth usually in the midline