RULES OF SELECTIVE GRINDING FINISHING AND POLISHING OF DENTURE FINISHING AND POLISHING OF DENTURE

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