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E. NGUYEN, D. XIE, and D. TOBIA, Kerr Corporation, Orange, CA, USA Objective : The purpose of this study was to evaluate the physical properties of four commercial temporary crown and bridge materials including Fill-In Unidose (Kerr), Luxatemp Plus (DMG), Protemp 3 Garant (3M/ESPE) and Integrity (Dentsply). Methods: Gel time and set time were tested by the Vicat needle. Barcol hardness was obtained according to ASTM-D2583. Volumetric shrinkage was determined by buoyancy method in de-ionized water. Maximum curing temperature was recorded on a thermocouple apparatus described in ISO4049. Approximately 1 gram of material was extruded and placed inside a plastic tube (f
10´
15 mm). A thermocouple positioned in contact with the center of material was connected to a controller linked to a computer for data acquisition. Three specimens from each material were made per test. Results: ANOVA analysis revealed that Fill-In Unidose had higher Barcol hardness than Protemp 3 Garant, lower than Luxatemp Plus and equivalent to Integrity. Fill-In Unidose was not significantly different from other tested materials in maximum curing temperature although it had the shortest set time. Fill-In Unidose had the lowest volumetric shrinkage among all tested materials.
|
Fill-In Unidose |
Luxatemp Plus |
Protemp 3 Garant |
Integrity |
|
Gel Time (sec) |
35±1 |
67±1 |
48±2 |
64±1 |
|
Set Time (sec) |
89±3 |
118±3 |
106±2 |
119±1 |
|
Barcol Hardness |
53±1b* |
56±1a |
50±1c |
54±1a,b |
|
Maximum Curing Temperature (°C) |
36.5±0.4a |
37.5±0.8a |
38.3±0.4a |
38.2±0.9a |
|
Volumetric Shrinkage @24 hrs (%) |
2.57±0.40b |
4.64±0.12a |
4.36±0.69a |
4.54±0.20a |
*Means with the same letters are not significantly different (p<0.05) within the same row.
Conclusions: Fill-In Unidose shrinks the least among all tested materials and is equivalent to the other tested materials in heat generation during setting. The surface hardness of Fill-In Unidose is higher than Protemp 3 Garant and is lower than Luxatemp Plus. |