0533 Temperature Pattern in Human Pulp While Fabricating Temporary Crowns
R. LANG, C. KOLBECK, M. ROSENTRITT, and G. HANDEL, University of Regensburg, Germany

Objectives: In this in vitro study the temperature pattern in the human pulp was investigated while fabricating temporary crowns out of different materials.

Methods: A human canine was exstirpated from apical, provided with a pulpal mini-thermopair (Ni-Cr-Ni, Æ 0.2mm) via root-channel and filled with a conducting medium. Moulds from the canine crown were made of a) Polyethylen-foil (Erkodur: Erkodont, G) and b) Soft-Silicone (Detaseal: Detax, G) which later provided identical morphology of the provisional crowns. After chamfer preparation with approximately 1.5mm residual dentin layer temporary crowns of every material listed below were fabricated and temperature shifts during fabrication were reported. Temperature shift D T was calculated out of starting temperature and maximum temperature Tmax. Statistical analysis was carried out using Mann-Whitney-U-Test with a £ 0.05.

Results:
   

Erkolen-Foil

Silicon-Mould

Resin-Group

Material: Manufacturer

TMax [°C]

D T [°C]

TMax [°C]

D T [°C]

Bis-GMA-Composites

LuxatempAutomix: DMG, G

28.2

6.1

25.4

3.9

Provipont DC: Ivoclar-Vivadent, G

34.9

10.2

31.6

6.3

Tempofit: Detax; G

29.3

5.3

24.4

1.3

Struktur2Dominant: Voco, G

34.4

13.4

25.7

4.5

ProtempGarant: 3M Espe, G

29.5

7.8

25.8

3.4

CronMix: Merz, G

27.7

4.8

23.4

0.8

Protemp3Garant: 3M Espe, G

34.2

7.7

29.1

2.5

PMMA-resins

UnifastTrad: GC, J

34.4

12.0

28.7

5.3

Trim: Bosworth, GB

29.0

7.3

26.4

4.6

Cronsin: Merz, G

28.5

6.5

25.7

3.6

Snap: Roeko, G

27.3

6.0

24.2

4.0

D T was significantly higher with the foil-moulds compared to the Silicone-moulds for all materials. D T of ProvipontDC, Struktur2Dominant and UnifastTrad were statistically significantly higher than those of all other resins when using Erkolen-foil.

Conclusion: None of the tested materials approached a pulp critical temperature of 42°C. The use of silicone-moulds should be recommended.

Seq #51 - Prosthodontics Research
2:00 PM-3:30 PM, Saturday, 28 August 2004 Crowne Plaza Hotel SEDIR IV

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