rules of selective grinding finishing and polishing of denture finishing and polishing of denture
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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