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In vitro investigation of heat transfer phenomenon in human immature teeth.

Talebi M, Moghimi S, Shafagh M, Kalani H, Mazhari F - J Dent Res Dent Clin Dent Prospects (2014)

Bottom Line: The results of the experimental tests and mathematical modeling illustrated that using LED LCU on immature teeth did not have any detrimental effect on the pulp temperature.Conclusion.Using LED LCU in immature teeth had no effect on pulp temperature in this study.

View Article: PubMed Central - HTML - PubMed

Affiliation: Associate Professor, Dental Materials Research Center, School of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran.

ABSTRACT
Background and aims. Heat generated within tooth during clinical dentistry can cause thermally induced damage to hard and soft components of the tooth (enamel, dentin and pulp). Geometrical characteristics of immature teeth are different from those of mature teeth. The purpose of this experimental and theoretical study was to investigate thermal changes in immature permanent teeth during the use of LED light-curing units (LCU). Materials and methods. This study was performed on the second mandibular premolars. This experimental investiga-tion was carried out for recording temperature variations of different sites of tooth and two dimensional finite element models were used for heat transfer phenomenon in immature teeth. Sensitivity analysis and local tests were included in the model validation phase. Results. Overall, thermal stimulation for 30 seconds with a low-intensity LED LCU increased the temperature from 28°C to 38°C in IIT (intact immature tooth) and PIT (cavity-prepared immature tooth). When a high-intensity LED LCU was used, tooth temperature increased from 28°C to 48°C. The results of the experimental tests and mathematical modeling illustrated that using LED LCU on immature teeth did not have any detrimental effect on the pulp temperature. Conclusion. Using LED LCU in immature teeth had no effect on pulp temperature in this study. Sensitivity analysis showed that variations of heat conductivity might affect heat transfer in immature teeth; therefore, further studies are required to determine thermal conductivity of immature teeth.

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Mentions: Sensitivity analysis tests were performed by applying changes to the enamel and dentin densities as well as enamel and dentin heat conductivity coefficients. Temperature changes at the locations T3 and T4 as a result of changes in enamel and dentin densities were negligible and therefore not illustrated in this report. The results of sensitivity analysis by applying changes in heat conductivity coefficients of enamel and dentin are shown in 5.


In vitro investigation of heat transfer phenomenon in human immature teeth.

Talebi M, Moghimi S, Shafagh M, Kalani H, Mazhari F - J Dent Res Dent Clin Dent Prospects (2014)

© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4288911&req=5

Mentions: Sensitivity analysis tests were performed by applying changes to the enamel and dentin densities as well as enamel and dentin heat conductivity coefficients. Temperature changes at the locations T3 and T4 as a result of changes in enamel and dentin densities were negligible and therefore not illustrated in this report. The results of sensitivity analysis by applying changes in heat conductivity coefficients of enamel and dentin are shown in 5.

Bottom Line: The results of the experimental tests and mathematical modeling illustrated that using LED LCU on immature teeth did not have any detrimental effect on the pulp temperature.Conclusion.Using LED LCU in immature teeth had no effect on pulp temperature in this study.

View Article: PubMed Central - HTML - PubMed

Affiliation: Associate Professor, Dental Materials Research Center, School of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran.

ABSTRACT
Background and aims. Heat generated within tooth during clinical dentistry can cause thermally induced damage to hard and soft components of the tooth (enamel, dentin and pulp). Geometrical characteristics of immature teeth are different from those of mature teeth. The purpose of this experimental and theoretical study was to investigate thermal changes in immature permanent teeth during the use of LED light-curing units (LCU). Materials and methods. This study was performed on the second mandibular premolars. This experimental investiga-tion was carried out for recording temperature variations of different sites of tooth and two dimensional finite element models were used for heat transfer phenomenon in immature teeth. Sensitivity analysis and local tests were included in the model validation phase. Results. Overall, thermal stimulation for 30 seconds with a low-intensity LED LCU increased the temperature from 28°C to 38°C in IIT (intact immature tooth) and PIT (cavity-prepared immature tooth). When a high-intensity LED LCU was used, tooth temperature increased from 28°C to 48°C. The results of the experimental tests and mathematical modeling illustrated that using LED LCU on immature teeth did not have any detrimental effect on the pulp temperature. Conclusion. Using LED LCU in immature teeth had no effect on pulp temperature in this study. Sensitivity analysis showed that variations of heat conductivity might affect heat transfer in immature teeth; therefore, further studies are required to determine thermal conductivity of immature teeth.

No MeSH data available.


Related in: MedlinePlus