RULES OF SELECTIVE GRINDING FINISHING AND POLISHING OF DENTURE

Supporting or Centric Holding Cusps * The vertical dimension of occlusion is maintained by occlusion of the palatal cusps of the maxillary teeth & the buccal cusps of the mand. teeth.

Rules of adjustment a- If the cusp is high in centric & eccentric positions. Reduce the cusp. b- If the cusp is high in centric & not in eccentric positions. Deepen the opposing fossa or marginal ridge.

eliminated in the centric & eccentric positions: * After all interceptive contacts have been eliminated in the centric & eccentric positions: a- Don’t reduce the maxillary palatal cusps or the mandibular buccal cusps. b- Don’t deepen the fossa or marginal ridge

II- Occlusal Balance in Lateral Excursion (B.U.L.L RULES) * Rules of Adjustment **** working side **** balancing side

III- Selective Grinding for Protrusive Balance * In protrusive balance, the anterior teeth should make incisal edge contact at the same time that the tips of the buccal & lingual cusps of the posterior teeth contact.

Rules of Adjustment a- If the anterior teeth have heavy contact with no posterior contact: * Reduce the labio-incisal surfaces of the mandibular teeth & the palatal surfaces of the maxillary teeth.

b- If the posterior teeth have heavy contact with no anterior teeth contact.

and selective grinding, the operator should check the following: * After finishing the laboratory remounting and selective grinding, the operator should check the following: 1- Clearance at the heals. 2- Accuracy of reproduction of the vertical dimension of occlusion.

3- Simultaneous contacts of posterior teeth in centric occlusion. 4- Excursive clearance from centric position ( bilateral balanced occlusion )

Clinical Remounting * It consists of remounting the finished denture on an articulator by using interocclusal records in the patient’s mouth * The occlusion is then adjusted on the articulator to remove discrepancies & interferences.

Centric Interocclusal Record * The centric interocclusal record is used to mount the mandibular denture on the articulator as a part of the clinical remount & selective grinding procedure.

Advantages of clinical Remounting 1- It reduces patient participation. 2- It permits the dentist to see better what he is doing. 3- It provides a stable working foundation; denture bases are not shifting .

4- The absence of saliva makes possible more accurate markings with the articulating paper. 5- Corrections can be made away from the patient .

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