Quiz 2 Flashcards
Acrylic resin prone to
Fatigue and impact fracture
Fractures caused by
Impact
Fabrication errors
Excessive loading
Continuous residual ridge resoprtion of the maxilla
Flexure around midline-leads to stress concentration
Most denture fractures happen
In the maxillary
Most common type of fracture
Midline fracture/crack of Maxillary CD
Midline fracture/crack of Maxillary CD caused by
Residual ridges resorb and remodel palatal bone does not resorb —> increased stress concentrations in middle of CD causes fracture initiation at midline
Solution to Midline fracture/crack of Maxillary CD
Metal reinforced acrylic denture base
Cause of debonding/fracture
Impact
Inadequate bonding of tooth to denture base—contamination during processing
Indications for Immediate CD
Failing permanent dentin due to generalized caries, PD, or malocclusion
Cooperative phjilispciual and socially active patients
Patients who want to maintain their appearance
Patients who have available time and can afford to cost
Contraindications for immediate CDs
Patients who are in poor overall health
Patients with uncontrolled systemic conditions
Exacting and or indifferent patients
Patients with unrealistic expectations and time schedules
Patients that exhibit restorable periodically stable teeth
The splinting and compression action
Promotes rapid healing as it protects the blood clot and stimulates proper ridge contours
Immediate Disadvantages
Lack of denture retention day of insertion
Constant need for reclines using tissue conditioners
Multiple post insertion adjustment visits
The iCD cannot by fully assessed until it is seated
Not a covered dental insurance benefit
Inability of an esthetic try in of the proposed denture tooth arrangement making the ethic outcome highly
Unpredictable
Wax rims establish
VDO and horizontal relationships of maxilla mandible and guide tooth position
The difficulty lies in
Making accurate recorders at the correct VDO at a repeatable position
Single phase surgical
Extract all remaining teeth insert interim complete
Double Phase surgical
Extractions are staged and posterior removed first
Allow posterior to heal and stabilize
Leave one definitive tooth contact on each side (1st PM maintain VDO)
Custom trays for ICD must have
2 mm clearanace for the broader molding material
Tray border must be smooth round and 2 mm thick all around
Appropriate extentin will reduce
Chair side adjustments
____ are key to successful impression
Borders
Elastometic impression materials are more
Rigid than alginate and may be once locked in pits mouth
Custom trays + PVS+ Undercuts+ perio D.=
Inability to remove impression once it has set
Record base and rims establish
Facial contours by providing proper support of the lips and cheeks
VDO
Record base and rims aid
In opritention of the occlusal plane
Tooth selection and antior tooth placement
