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Temperature rise during Er:YAG cavity preparation of primary enamel.

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Title: Temperature rise during Er:YAG cavity preparation of primary enamel.
Authors: Contente, Marta1, Lima, Fabrício2, Galo, Rodrigo3 rogallo@usp.br, Pécora, Jesus4, Bachmann, Luciano2, Palma-Dibb, Regina4, Borsatto, Maria1 borsatto@forp.usp.br
Source: Lasers in Medical Science. Jan2012, Vol. 27 Issue 1, p1-5. 5p.
Subjects: Dental enamel, Temperature, Laser endoscopy, Dental cavity preparation, Deciduous teeth, Thermocouples, Data analysis
Abstract: This study aimed to assess in vitro thermal alterations taking place during the Er:YAG laser cavity preparation of primary tooth enamel at different energies and pulse repetition rates. Forty healthy human primary molars were bisected in a mesio-distal direction, thus providing 80 fragments. Two small orifices were made on the dentin surface to which type K thermocouples were attached. The fragments were individually fixed with wax in a cylindrical Plexiglass® abutment and randomly assigned to eight groups, according to the laser parameters ( n = 10): G1 - 250 mJ/ 3 Hz, G2 - 250 mJ/ 4 Hz, G3 - 250 mJ/ 6 Hz, G4 - 250 mJ/10 Hz, G5 - 250 mJ/ 15 Hz, G6 - 300 mJ/ 3 Hz, G7 - 300 mJ/ 4 Hz and G8 - 300 mJ/ 6 Hz. An area of 4 mm was delimited. Cavities were done (2 mm long × 2 mm wide × 1 mm thick) using non-contact (12 mm) and focused mode. Temperature values were registered from the start of laser irradiation until the end of cavity preparation. Data were analyzed by one-way ANOVA and Tukey test ( p ≤ 0.05). Groups G1, G2, G6, and G7 were statistically similar and furnished the lowest mean values of temperature rise. The set 250 mJ/10 and 15 Hz yielded the highest temperature values. The sets 250 and 300 mJ and 6 Hz provided temperatures with mean values below the acceptable critical value, suggesting that these parameters ablate the primary tooth enamel. Moreover, the temperature elevation was directly related to the increase in the employed pulse repetition rates. In addition, there was no direct correlation between temperature rise and energy density. Therefore, it is important to use a lower pulse frequency, such as 300 mJ and 6 Hz, during cavity preparation in pediatric patients. [ABSTRACT FROM AUTHOR]
Copyright of Lasers in Medical Science is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: <searchLink fieldCode="AR" term="%22Contente%2C+Marta%22">Contente, Marta</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Lima%2C+Fabrício%22">Lima, Fabrício</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Galo%2C+Rodrigo%22">Galo, Rodrigo</searchLink><relatesTo>3</relatesTo><i> rogallo@usp.br</i><br /><searchLink fieldCode="AR" term="%22Pécora%2C+Jesus%22">Pécora, Jesus</searchLink><relatesTo>4</relatesTo><br /><searchLink fieldCode="AR" term="%22Bachmann%2C+Luciano%22">Bachmann, Luciano</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Palma-Dibb%2C+Regina%22">Palma-Dibb, Regina</searchLink><relatesTo>4</relatesTo><br /><searchLink fieldCode="AR" term="%22Borsatto%2C+Maria%22">Borsatto, Maria</searchLink><relatesTo>1</relatesTo><i> borsatto@forp.usp.br</i>
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  Data: This study aimed to assess in vitro thermal alterations taking place during the Er:YAG laser cavity preparation of primary tooth enamel at different energies and pulse repetition rates. Forty healthy human primary molars were bisected in a mesio-distal direction, thus providing 80 fragments. Two small orifices were made on the dentin surface to which type K thermocouples were attached. The fragments were individually fixed with wax in a cylindrical Plexiglass® abutment and randomly assigned to eight groups, according to the laser parameters ( n = 10): G1 - 250 mJ/ 3 Hz, G2 - 250 mJ/ 4 Hz, G3 - 250 mJ/ 6 Hz, G4 - 250 mJ/10 Hz, G5 - 250 mJ/ 15 Hz, G6 - 300 mJ/ 3 Hz, G7 - 300 mJ/ 4 Hz and G8 - 300 mJ/ 6 Hz. An area of 4 mm was delimited. Cavities were done (2 mm long × 2 mm wide × 1 mm thick) using non-contact (12 mm) and focused mode. Temperature values were registered from the start of laser irradiation until the end of cavity preparation. Data were analyzed by one-way ANOVA and Tukey test ( p ≤ 0.05). Groups G1, G2, G6, and G7 were statistically similar and furnished the lowest mean values of temperature rise. The set 250 mJ/10 and 15 Hz yielded the highest temperature values. The sets 250 and 300 mJ and 6 Hz provided temperatures with mean values below the acceptable critical value, suggesting that these parameters ablate the primary tooth enamel. Moreover, the temperature elevation was directly related to the increase in the employed pulse repetition rates. In addition, there was no direct correlation between temperature rise and energy density. Therefore, it is important to use a lower pulse frequency, such as 300 mJ and 6 Hz, during cavity preparation in pediatric patients. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Lasers in Medical Science is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1007/s10103-010-0823-8
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        Text: English
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      – SubjectFull: Dental enamel
        Type: general
      – SubjectFull: Temperature
        Type: general
      – SubjectFull: Laser endoscopy
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      – SubjectFull: Dental cavity preparation
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      – SubjectFull: Deciduous teeth
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      – SubjectFull: Data analysis
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      – TitleFull: Temperature rise during Er:YAG cavity preparation of primary enamel.
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              Text: Jan2012
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