Effect of water temperature on the fit of provisional crown margins during polymerization
STATEMENT OF PROBLEM: When fabricating a provisional crown with the direct technique, dentists are concerned with margin discrepancies that result from polymerization shrinkage.
PURPOSE: This in vitro study examined the effect of water temperature on the fit of provisional crown margins during resin polymerization.
MATERIAL AND METHODS: The experiment was designed to simulate a direct technique to fabricate provisional crowns. After mixing autopolymerizing methyl methacrylate resin, the material was placed in a preformed polycarbonate crown. The crown was seated on a prepared premolar-shaped die with a shoulder margin. After 1 minute and 50 seconds, the crown was removed and polymerization was continued under the following conditions: 20 degrees C air, and water at 0 degrees C, 10 degrees C, 20 degrees C, 30 degrees C, 40 degrees C, 60 degrees C, and 80 degrees C. Six minutes after polymerization, the crown was trimmed and reseated on the die. Discrepancy of crown margin was measured with a 3-dimensional digitizer.
RESULTS: Margin discrepancy varied with the condition during resin-polymerization (ANOVA, P <.001). The crowns polymerized in 20 degrees C and 30 degrees C water revealed the best margin fit, showing 3 times more accurate margin fit than those polymerized in 20 degrees C air (Bonferroni/Dunn procedure, P <.01).
CONCLUSION: Conditions during resin polymerization were significant factors that affected margin fit of provisional crowns using the direct technique. Water temperatures of 20 degrees C and 30 degrees C produced the best fit at the margin of the provisional crown.
| Medienart: |
Artikel |
|---|
| Erscheinungsjahr: |
1999 |
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| Erschienen: |
1999 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:82 |
|---|---|
| Enthalten in: |
The Journal of prosthetic dentistry - 82(1999), 6 vom: 07. Dez., Seite 658-61 |
| Sprache: |
Englisch |
|---|
| Beteiligte Personen: |
Ogawa, T [VerfasserIn] |
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| Themen: |
059QF0KO0R |
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| Anmerkungen: |
Date Completed 28.12.1999 Date Revised 11.07.2019 published: Print Citation Status MEDLINE |
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| Förderinstitution / Projekttitel: |
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| PPN (Katalog-ID): |
NLM105186775 |
|---|
| LEADER | 01000naa a22002652 4500 | ||
|---|---|---|---|
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| 100 | 1 | |a Ogawa, T |e verfasserin |4 aut | |
| 245 | 1 | 0 | |a Effect of water temperature on the fit of provisional crown margins during polymerization |
| 264 | 1 | |c 1999 | |
| 336 | |a Text |b txt |2 rdacontent | ||
| 337 | |a ohne Hilfsmittel zu benutzen |b n |2 rdamedia | ||
| 338 | |a Band |b nc |2 rdacarrier | ||
| 500 | |a Date Completed 28.12.1999 | ||
| 500 | |a Date Revised 11.07.2019 | ||
| 500 | |a published: Print | ||
| 500 | |a Citation Status MEDLINE | ||
| 520 | |a STATEMENT OF PROBLEM: When fabricating a provisional crown with the direct technique, dentists are concerned with margin discrepancies that result from polymerization shrinkage | ||
| 520 | |a PURPOSE: This in vitro study examined the effect of water temperature on the fit of provisional crown margins during resin polymerization | ||
| 520 | |a MATERIAL AND METHODS: The experiment was designed to simulate a direct technique to fabricate provisional crowns. After mixing autopolymerizing methyl methacrylate resin, the material was placed in a preformed polycarbonate crown. The crown was seated on a prepared premolar-shaped die with a shoulder margin. After 1 minute and 50 seconds, the crown was removed and polymerization was continued under the following conditions: 20 degrees C air, and water at 0 degrees C, 10 degrees C, 20 degrees C, 30 degrees C, 40 degrees C, 60 degrees C, and 80 degrees C. Six minutes after polymerization, the crown was trimmed and reseated on the die. Discrepancy of crown margin was measured with a 3-dimensional digitizer | ||
| 520 | |a RESULTS: Margin discrepancy varied with the condition during resin-polymerization (ANOVA, P <.001). The crowns polymerized in 20 degrees C and 30 degrees C water revealed the best margin fit, showing 3 times more accurate margin fit than those polymerized in 20 degrees C air (Bonferroni/Dunn procedure, P <.01) | ||
| 520 | |a CONCLUSION: Conditions during resin polymerization were significant factors that affected margin fit of provisional crowns using the direct technique. Water temperatures of 20 degrees C and 30 degrees C produced the best fit at the margin of the provisional crown | ||
| 650 | 4 | |a Comparative Study | |
| 650 | 4 | |a Journal Article | |
| 650 | 7 | |a Methylmethacrylates |2 NLM | |
| 650 | 7 | |a Polymers |2 NLM | |
| 650 | 7 | |a Water |2 NLM | |
| 650 | 7 | |a 059QF0KO0R |2 NLM | |
| 700 | 1 | |a Aizawa, S |e verfasserin |4 aut | |
| 700 | 1 | |a Tanaka, M |e verfasserin |4 aut | |
| 700 | 1 | |a Matsuya, S |e verfasserin |4 aut | |
| 700 | 1 | |a Hasegawa, A |e verfasserin |4 aut | |
| 700 | 1 | |a Koyano, K |e verfasserin |4 aut | |
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