RULES OF SELECTIVE RULES OF SELECTIVE GRINDINGGRINDING

FINISHING AND POLISHING OF FINISHING AND POLISHING OF DENTUREDENTURE

Supporting or Centric Holding Supporting or Centric Holding CuspsCusps

* The vertical * The vertical

dimension of occlusion dimension of occlusion

is maintained byis maintained by

occlusion of the palatalocclusion of the palatal

cusps of the maxillarycusps of the maxillary

teeth & the buccal teeth & the buccal

cusps of the mand. cusps of the mand.

teeth.teeth.

Rules of adjustmentRules of adjustment

a- If the cusp is high in centric & eccentrica- If the cusp is high in centric & eccentric

positions. positions. Reduce the cusp.Reduce the cusp.

b- If the cusp is high in centric & not in b- If the cusp is high in centric & not in eccentriceccentric

positions. positions. Deepen the opposing fossa or Deepen the opposing fossa or

marginal ridge.marginal ridge.

* After all interceptive * After all interceptive contacts have been contacts have been

eliminated in the centric eliminated in the centric & eccentric positions:& eccentric positions:

a- Don’t reduce the a- Don’t reduce the maxillary palatal cusps maxillary palatal cusps or the mandibular buccal or the mandibular buccal cusps.cusps.

b- Don’t deepen the fossa b- Don’t deepen the fossa or marginal ridgeor marginal ridge

II- Occlusal Balance in Lateral II- Occlusal Balance in Lateral ExcursionExcursion

(B.U.L.L RULES)(B.U.L.L RULES)

* Rules of Adjustment* Rules of Adjustment**** working side**** working side**** balancing side**** balancing side

III- Selective Grinding for III- Selective Grinding for Protrusive BalanceProtrusive Balance

* In protrusive balance,* In protrusive balance, the anterior teeth the anterior teeth

should make incisal edge contact at the should make incisal edge contact at the

same time that the tips of the buccal &same time that the tips of the buccal &

lingual cusps of the posterior teeth contact.lingual cusps of the posterior teeth contact.

Rules of AdjustmentRules of Adjustment

a- If the anterior teeth have heavy contacta- If the anterior teeth have heavy contact

with no posterior contact:with no posterior contact:

* Reduce the labio-incisal surfaces of the * Reduce the labio-incisal surfaces of the mandibular teeth & the palatal surfacesmandibular teeth & the palatal surfaces

of the maxillary teeth.of the maxillary teeth.

b- If the posterior teeth have heavy contact b- If the posterior teeth have heavy contact

with no anterior teeth contact.with no anterior teeth contact.

* After finishing the laboratory remounting* After finishing the laboratory remounting and selective grinding, the operator shouldand selective grinding, the operator should check the following:check the following:

1- Clearance at the heals.1- Clearance at the heals.

2- Accuracy of reproduction of the vertical 2- Accuracy of reproduction of the vertical dimension of occlusion.dimension of occlusion.

3- Simultaneous contacts of posterior teeth3- Simultaneous contacts of posterior teeth

in centric occlusion.in centric occlusion.

4- Excursive clearance from centric 4- Excursive clearance from centric

position ( bilateral balanced occlusion )position ( bilateral balanced occlusion )

Clinical RemountingClinical Remounting

* It consists of remounting the finished * It consists of remounting the finished denture on an articulator by using denture on an articulator by using

interocclusal records in the patient’s mouthinterocclusal records in the patient’s mouth

* The occlusion is then adjusted on the * The occlusion is then adjusted on the articulator to remove discrepancies &articulator to remove discrepancies & interferences.interferences.

Centric Interocclusal RecordCentric Interocclusal Record

* The centric * The centric interocclusal record is interocclusal record is used to mount theused to mount the

mandibular denture mandibular denture on the articulator as a on the articulator as a part of the clinical part of the clinical remount & selectiveremount & selective

grinding procedure.grinding procedure.

Advantages of clinical RemountingAdvantages of clinical Remounting

1- It reduces patient participation.1- It reduces patient participation.

2- It permits the dentist to see better what2- It permits the dentist to see better what

he is doing.he is doing.

3- It provides a stable working foundation;3- It provides a stable working foundation;

denture bases are not shifting .denture bases are not shifting .

4- The absence of saliva makes possible4- The absence of saliva makes possible

more accurate markings with the more accurate markings with the

articulating paper.articulating paper.

5- Corrections can be made away from 5- Corrections can be made away from

the patient . the patient .

THANKSTHANKS