provisional restoration in fixed prosthodontics

1. PROVISIONAL
RESTORATION OR
TEMPORIZATION IN
FPD
MUGILARASAN MUNISAMY.CRRI
DEPARTMENT OF PROTHODONTICS

2. CONTENTS
 Definition
 Ideal requirements of provisional restoration
 Indications
 Classification of privisional restorations
 Techniques of fabrication
 Cementation
 Conclussion

3. DEFINITION  According to the Glossary of prosthodontic terms it can be
defined as a transitional restoration that provides protection,
stabilization and function before fabrication of the definitive
prosthesis.
 After tooth preparation temporary protective or functional
restoration is fabricated over the prepared tooth to be used
until fabrication of final prosthesis .

4. IDEAL
REQUIREMENTS
OF
PROVISIONAL
RESTORATION
 BIOLOGIC REQUIREMENTS
 MECHANICAL REQUIREMENTS
 ESTHETICREQUIREMENTS

5. BIOLOGICAL
REQUIREMENTS
 Provisional restoration should Protect the pulp because a
freshly prepared tooth will have increased sensitivity
 Maintain periodontal health(good marginal fit)
 Be occlusally Compatible
 Protect against fracture

6. MECHANICAL
REQUIREMENTS
Provisional restoration should
 Resist functional loads
 Resist removal forces
 Maintain interabutment alignment

7. ESTHETIC
REQUIRMENTS
Provisional restoration should
 Be easily contourable
 Be color compatible
 Be translucent
 Be color stable

8. INDICATIONS
 A long span posterior fpd
 Prolonged treatment time
 Patient unable to avoid excessive forces on the prosthesis
 Above average masticatory muscle
 History of frequent breakage

9. Typesofprovisional
restorations
Based on
 Method of fabrication
 Materials used
 According duration of using
 According to technique of fabrication

10. Methodoffabrication
Custom made provisional restoration
 This restoration is fabricated to reproduce the original
contours of the tooth
 An impression of the prepared tooth is made
 and a cast is poured
 Prepared tooth on the cast is waxed up
 and carved to reproduce the original contours
 Preformed provisional restorations
 These are commercially available prefabricated crowns
 Available in various sizes
 Operator chooses the best one suit to the
 patient U Before cementation these crowns are slightly
altered and modified to fit the tooth

11. IDEAL
REQUIREMENTS
OF PROVISIONAL
RESTORATION
MATERIALS
• Adequate strength and wear resistance.
• Biocompatibility.
• Dimensional stability.
• Easy to contour and polish.
• Odourless and nonirritating.
• Chemically compatible with the luting cements.
• Aesthetically acceptable.
• Adequate working and setting time.
• Easy to repair.

12. Dependingupon
typeofmaterial
used
Resin based provisional restoration
 Cellulose acetate
 Polycarbonate
 Poly-methyl methacrylate
 Poly-r methacrylate Microfilled composite
 Urethane dimethacrylate
Metal provisional restoration
 Alumnium
 Nickel titanium
 Tin silver

13. Accordingto
durationofusage
 Short term temporary restoration(2Weeks )
 Long term temporary restoration(few months)

14. Accordingtotechniqueof
fabrication
 Direct technique( intraorally )
 Indirect technique(extraorally)
 Direct indirect technique(both intra and extraorally )

15. Directtechnique

16. Directtechnique
 Step 1- Place acrylic tooth in missing area
 Step 2 - Take alginate or putty impression
 Step 3 – Prepare the tooth in patient mouth
 Step 4- Lubricate the tooth and adjacent gingival regions with
petrolium jelly
 Step 5- Mix and place the temporary material in the
impression which is previously taken
 Step 6- Reseat the impression on the prepared tooth
 Step 7- Remove and reseat the restoration untill it sets
 Step 8- Finish , polish and cement the restoration.

17. Indirecttechnique

18. INDIRECT
TECHNIQUE
 Step 1 – Prepare diagnostic cast , then place and arylic tooth
on missing tooth region
 Step 2 – Make and putty index on the diagnostic cast which
should cover the adjacent abutment tooth on both sides
 Step 3- Prepare the patients tooth as usual manner
 Step 4 – Make an sectional impression on the prepared tooth
and make an check cast
 Step 5- then apply separating medium on the check cast and
mix the temporary restorative material and place on the tissue
surface of the putty index.
 Step 6- after sitting check the fit of temporary restorations on
cast and intraorally
 Step 7 – If thre correction do it then finish, polish and cement
the restoration.

19. Direct–Indirect
technique

20. Direct–indirect
technique
 Step 1 - Take and impression of unprepared tooth and
missing region And pour unprepared diagnostic cast .
 Step 2- Pace an pontic on missing tooth region and do
modifications using the wax for contours , contacts and
occlusion
 Step 3- Lubricate the cast and make and imprrssion using
high viscosity elastomeric impression materials
 Step 4 – Remove the acrylic tooth and prepare the abutment
tooth on the doagnoatic cast
 Step 5 – Apply separating medium on the cast and mix the
temporary restorative material and place in index and then
reseat on the diagnostic cast.

21.  Step 6- After polimarization of temporary restoration , finish it
and check the fitting on the diagnostic cast
 Step 7- then prepare the tooth in the patients mouth asusual
manner
 Step 8- Try the restoration on the patients mouth and make it
to fit , then finish, polish and cement the temporary
restoration.

22. Recent advances in provisional materials
Computer-aided design (CAD)/computer-aided engineering (CAE)
aided fabrication using precision-milled acrylate polymer-filled
contoured single- and multiple-unit provisional restorations are now
available that offer increased strength and fit along with a
customizable solution for even the most demanding of patients.The
main disadvantage is increased cost.

23. Cementation
IDEAL PROPERTIES
• Ability to seal against leakage of oral fluid.
• Strength consistent with intentional removal.
• Low solubility.
• Blandness or obtundency.
• Chemical compatibility with the provisional polymer.
• Convenience of dispensing and mixing.
• Ease of eliminating excess.
• Adequate working time and short setting time.
• Compatibility with the definitive luting agent.

24. Cement used
in provisional
restoration
1. Zinc oxide eugenol
2. Reinforced zinc oxide eugenol
3. Noneugenol cements.

25. Conclusion
SUMMARY
Provisional restoration is essential immediately after tooth
preparation to prevent the tooth from injury, abnormal tooth
movement.
It should fulfil the ideal requirements and should be well
tolerated and easily accepted by patients.
Each provisional restorative material has certain advantages and
disadvantages and is selected based on the clinical situation.