Secondard impression materials

1. Charles J. Goodacre, DDS, MSD
Professor of Restorative Dentistry
Loma Linda University School of Dentistry
This program of instruction is protected by copyright ©. No portion of this
program of instruction may be reproduced, recorded or transferred by any
means electronic, digital, photographic, mechanical etc., or by any information
storage or retrieval system, without prior permission.
Provisional restorations in fixed
prosthodontics

2. Provisional Restorations
• They are restorations that provide interim protection,
mastication, esthetics, and positional stability while the
definitive restoration is being fabricated
• FUNCTIONS / REQUIREMENTS
1) Protection / Preservation; (prepared tooth from
damage; pulp from irritation; cheeks / tongue / lips
from trauma; periodontal health by good fit, contour, & surface
smoothness)
2) Mastication; (allow some chewing of food)
3) Positional stability; (tooth; gingiva; lips / cheeks)
4) Esthetics for visible teeth;
5) Provide diagnostic information

3. Provisional Restoration Resins
• Methyl methacrylate (Jet)
- Reasonably hard; sets somewhat
rapidly; reasonable color stability
• Ethyl methacrylate (Trim)
- Not as hard as methyl methacrylate;
slower set and more working
time; susceptible to discoloration
• Composite resin (Protemp; Integrity)
- Hardest; rapid polymerization; best
color stability

4. Provisional Restoration Resins
• Methyl methacrylate (Jet)
- Reasonably hard; sets somewhat rapidly;
reasonable color stability
• Ethyl methacrylate (Trim)
- Not as hard as methyl methacrylate; slower set and
more working time; susceptible to discoloration
• Composite resin (Protemp; Integrity)
- Hardest; rapid polymerization; best color
stability

5. Types of Provisional Restorations
• Prefabricated
1) Metal shell / relined metal shell
2) Relined polycarbonate shell
• Custom-fabricated
1) Template & unfilled resin
2) Template & composite resin
3) Laboratory produced shell
4) Cast metal (long-term service needed)
• “Direct on tooth” versus “Indirect on cast”

6. Direct versus Indirect
• Direct is faster for routine provisional
restorations
• Indirect can save time with multiple units
or complex fixed partial dentures
• Indirect provisionals can be fabricated in
advance of the tooth preparation
appointment

7. Direct Technique:
Types of Templates
• Putty index made on cast or intraorally using a tray

8. Direct Technique:
Types of Templates
• Putty index made on cast or intraorally using a tray
• Clear plastic vacuum-formed template

9. Direct Technique:
Types of Templates
• Putty index made on cast or intraorally using a tray
• Clear plastic vacuum-formed template
• Repair of crown / prosthesis that was removed

10. DIRECT TECHNIQUES

11. Relined Aluminum Shells

12. Relined Polycarbonate
Crowns

13. Putty Template

14. Putty Template

17. TEMP TABS® – TRUE BLUE
• Do a Google search “temp tabs dental”
• Heat at 135 degrees Fahrenheit
• Mold over teeth & then blow air for 10 seconds

18. Vacuum-Formed Template

19. Crown Removal & Repair

25. Products Used
• Carbide bur
• Bonding resin
• Color modifier
• Resin glaze
Brasseler XTREMECUT 330MZ
PermaSeal by Ultradent

26. Crown Removal & Repair

27. Provisional Restoration for RCT
with Prefabricated P&C

28. Provisional Restoration for RCT while
Custom Cast P&C is being Fabricated

29. INDIRECT TECHNIQUES
• Prepare tooth / teeth and make impression
• Laboratory then fabricates provisional
restoration(s) while patient waits
OR
• Laboratory fabricates shell provisional
restoration before the patient comes for the
tooth preparation appointment

30. Shell Fabrication

31. Minimal tooth preparations completed on cast;
Less reduction than will be achieved clinically
Space between shell
and minimal tooth
preparations will be
filled with resin

33. Video of Shell Fabricated by Laboratory
in Advance of Tooth Preparation

34. Provisional Cements
• They are typically zinc oxide powder or zinc oxide paste mixed with
eugenol liquid
• Noneugenol formulations are available that do not soften resin (as in
provisional crown). They use carboxylic acids in place of eugenol
• The liquid can be ethoxybenzoic acid, known as ZOEBA, making it
stronger
• TempBond Clear is a translucent cement with Triclosan (an antibacterial &
antifungal agent)

35. Thank You For Your
Kind Attention
Charles J. Goodacre, DDS, MSD
Professor of Restorative Dentistry
Loma Linda University School of Dentistry

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