Provisional Restorations Flashcards
what is a provisional
a prosthesis designed to enhance esthetics, stabilization and/or function for a limited period of time after which it is to be replaced by a definitive prostheses
what is a provisonal used for
to assist in determination of the therapeutic effectiveness of a specific treatment plan or the form and function of the planned definitive prosthesis
what is the advantage of digital dentistry
provisionals are not needed when you can digital scan and mill in the office as the patient leaves the office with a cemented definitieve restoration
what are the functions of a provisional restoration
- prevent sensitivity
- prevent drifting
- allow tissues to heal
- return function to dentition
- esthetics
- diagnostic evaluations
what are the requirements of a quality provisional
- pulpal protection
- positional stability
- occlusal function
- ability to clean
- marginal integrity
- strength and retention
- esthetics and phonetics
how do provisional restorations protect the prepared teeht
- protect against plaque and saliva
- protect against irritating and painful stimuli such as temperature changes and chemicals/fluids
- protect against abrasion or breakage of prepared tooth
what provides positional stability of the provisionL
-proximal contacts
- occlusal contact
- inter-abutment stability with a bridge
a provisional will prevent _____ drifting of the prepared and/or adjacent eeth
lateral
a provisional with open contacts will allow:
food and debris to impact in between
what do open contacts lead to
short term discomfort and pain
- periodontal inflammation and possibility of too much bleeding to be able to seat the crown when patient returns
without appropriate contacts on your provisional:
there is a good chance the teeth will shift collapsing the vertical between your preparation and opposing
what does lack of occlusal contact result in
extrusion
what will happen when trying to seat definitive crown if provisional is too low
the crown will be high
- material can be thinned and weaker, anatomy destroyed and crown cant function appropriately in the occlusal scheme of the patient
if the temporary is too high:
there will be pain, possible loss of the temporary or a breakage of temporary
describe the ideal occlusal contacts
- ideal centric occlusal contacts
- lateral and protrusive guidance where appropriate (anterior teeth)
- no contact in lateral or protrusive on posterior teeth
describe the provisonal/peridontal interaction
- non- impinging margins
- physiologic contours, emergence profiles, embrasures, and proximal contacts
- smooth surface texture and finsih
- all these lead to optimum periodontal health and predictable crown delivery
describe provisional marginal integrity
- fit as close to the finish line of the tooth as possible
- shape the contour to make it smooth and undetectable with an explorer with a smooth surface finish
- seal the provisional at the margin to prevent pain, sensitivity or dislodgement
how should the emergence profile on the provisional look
flat or slightly concave not convexed or bulging
what does a rough margin lead to
plaque accumulation and gingival inflammation
what does bleeding gums pose a challenge to
impressions and crown seating
need adequate _______ for strength
thickness of material
what allows for adequate thickness of temporary
adequate tooth reduction
what is the #1 reason temporaries break
occlusion
describe bis-acryl
- easy to use and easy to trim and polish
- is a brittle material which can fracture if occlusal load is too strong and if material is too thin
