1. DENT204, UNC School of Dentistry
PROVISIONAL
RESTORATIONS
DENT204, UNC School of Dentistry
Stephen C. Bayne and
Jeffrey Y. Thompson
Department of Operative Dentistry
School of Dentistry
University of North Carolina
Chapel Hill, NC

2. Temporary = Provisional = Non-Permanent = 2-26 weeks
INTRODUCTION
Definitions
Temporary = Provisional = Non-Permanent = 2-26 weeks
Short-
Term
Long-
Term
TEMPORARY 10 20 30 40
50 weeks
Temporary System = RESTORATION + CEMENT
EXAMPLES: Temporary crown fabrication procedures:
a. DIRECT -- intraoral fabrication (and intraoral/extraoral curing)
b. INDIRECT -- extraoral or laboratory fabrication
0s = mix and add to pre-impression; 45s = insert in mouth;
1m = initial set; 2m = remove; 6m= trim; 7m =contour and polish;
12m =cement in mouth.

3. Preparation of Temporary Bridge
INTRODUCTION
Preparation of Temporary Bridge
Mix.
Add to pre-impression.
Insert in mouth.
Initial set.
Trim.
Light cure in mouth.
Light cure in hand.
Trim and polish
Cement.

4. Goals and Desirable Properties
INTRODUCTION
Goals and Desirable Properties
1. Physiologic goals (protection of hard and soft tissues, stabilization of tooth, function for chewing, therapeutic (pulpal medication), and/or patient comfort)
a. Good esthetics -- good color matching and stain resistance (to coffee and tea)
b. Good fracture and wear resistance
c. Good biocompatibility -- no sensitivity reactions
2. Manipulation goals (ease of use, versatility, low cost, easy to repair)
a. Fast reaction, low polymerization exotherm, and high percent conversion
b. Minimal surface reactions on curing (O2 and/or impression mtl (e.g., PVS) may cuase surface inhibition)
3. Post-temporization goals (no interference with bonding permanent restorations)

5. Provisional Restorations and Cements
CLASSIFICATION
Provisional Restorations and Cements
1. Provisional restorations
a. Intracoronal Restorations:
(1) ZOE-based and/or ZONE-based temporaries
b. Preformed Provisional Shell Crowns (and Cements):
(1) Polycarbonate Crowns
(2) Metal Alloy Crowns
(Al, Anodized Al, Sn-Ag, Stainless Steel, Ni-Cr)
c. Custom-Fabricated Provisional Crowns (and Cements):
(1) MMA-like products (MMA/PMMA, IBMA/PBMA, EMA/PEMA) – self-cure
(2) Epimine-imine products – self-cure
(3) Bis-acryl, bis-methacryl, Bis-GMA-like – self-cure, dual cure, VLC
(a) Resins
(b) Composites
2. Temporary cements:
a. ZOE-based or ZNOE-based cements:
b. Calcium hydroxide cements
c. "Admix cements" (Cements mixed with vaseline or petroleum jelly)
d. Composite cements (without bonding systems)

6. Provisional Restorative Materials
PRODUCTS
Provisional Restorative Materials

7. PRODUCTS
Temporary Cements

8. POPULARITY 1999 Provisional Materials Market Share (~$20 Million)
Self-Cure Composite Resins
84%
Methyl & Ethyl Methacrylates
12%
Dual-Cure Composite Resins 4%
DMG/Zenith
Luxatemp
25%
Caulk
Integrity
15%
ESPE
Protemp
32%
Kerr
Temphase 8%
Parkell
Snap 5%
Bosworth
Trim
Other
All Types
10%
Personal Communication: Dr. Ed Shellard-Kerr Corporation

9. Examples of Chemical, Physcial, and Mechanical Properties
Iso-Temp
(3M)
Luxatemp
AutoMix
(DMG)
Prodigy
Composite
(Kerr)
Z100
Type
Temporary
Permanent
Cure CC DC
VLC
Cure Time
6-7 m
% Shrinkage DT
38 C
CS (MPa)
220
263
324
DTS (MPa) 36 41 57
FS (MPa) 80
124
105
BFS (MPa)
104
128
183
190

10. EXAMPLES
Bis-Acryl Materials

11. EXAMPLES
MMA Materials

12. THANK YOU