Download Supporting or Centric Holding Cusps

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.
* 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.
* 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 .

THANKS