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Evaluation of temperature increase during in-office bleaching.

Mondelli RF, Soares AF, Pangrazio EG, Wang L, Ishikiriama SK, Bombonatti JF - J Appl Oral Sci (2016)

Bottom Line: The use of light sources in the bleaching process reduces the time required and promotes satisfactory results.Temperature increase values were compared by two-way ANOVA and Tukey´s tests (p<0.05).The green LED unit with and without gel application did not produce any significant intrapulpal temperature variations.

View Article: PubMed Central - PubMed

Affiliation: Departamento de Dentística, Endodontia e Materiais Odontológicos, Faculdade de Odontologia de Bauru, Universidade de São Paulo, Bauru, SP, Brasil.

ABSTRACT
The use of light sources in the bleaching process reduces the time required and promotes satisfactory results. However, these light sources can cause an increase in the pulp temperature. Objective The purpose of the present study was to measure the increase in intrapulpal temperature induced by different light-activated bleaching procedures with and without the use of a bleaching gel. Material and Methods A human maxillary central incisor was sectioned 2 mm below the cementoenamel junction. A K-type thermocouple probe was introduced into the pulp chamber. A 35% hydrogen peroxide bleaching gel was applied to the vestibular tooth surface. The light units used were a conventional halogen, a hybrid light (only LED and LED/Laser), a high intensity LED, and a green LED light. Temperature increase values were compared by two-way ANOVA and Tukey´s tests (p<0.05). Results There were statistically significant differences in temperature increases between the different light sources used and between the same light sources with and without the use of a bleaching gel. The presence of a bleaching gel generated an increase in intra-pulpal temperature in groups activated with halogen light, hybrid light, and high intensity LED. Compared to the other light sources, the conventional halogen lamp applied over the bleaching gel induced a significant increase in temperature (3.83±0.41°C). The green LED unit with and without gel application did not produce any significant intrapulpal temperature variations. Conclusion In the present study, the conventional halogen lamp caused the highest increase in intrapulpal temperature, and the green LED caused the least. There was an increase in temperature with all lights tested and the maximum temperature remained below the critical level (5.5°C). The addition of a bleaching gel led to a higher increase in intrapulpal temperatures.

No MeSH data available.


Schematic drawing of experimental set up showing the starting temperature before light activation
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f02: Schematic drawing of experimental set up showing the starting temperature before light activation

Mentions: A single, human central upper incisor was used throughout the test. This tooth was donated from an organ bank of the Bauru School of Dentistry (FOB-USP), having obtained approval by the ethics committee of the institution through process no. 002/2008. The root of the tooth was sectioned 2 mm below the cementoenamel junction, perpendicular to the long axis of the tooth, using a slow speed diamond disc (Isomet, Buehler Ltd., Lake Bluff, IL, USA). The apical foramen of the root canal was enlarged using a #2135 diamond bur (KG Sorensen, Cotia, SP, Brazil) and all pulp tissue remnants were removed from the pulp chamber. The empty pulp chamber was filled with a heat absorption compound (Termal Paste, Implastec, Votorantim, SP, Brazil; 55.15.3243.3788) to simulate the pulp tissue as a heat conducting medium. A thin K-type thermocouple probe (MT 401A, Minilpa Ind. Com. Ltda., São Paulo, SP, Brazil) was inserted into the pulp chamber through the apical foramen and placed at its most coronal level. Its position was radiographically checked. During the testing procedure, the root surface of the tooth was partially submerged into a water bath at 37±1°C (Figure 2).


Evaluation of temperature increase during in-office bleaching.

Mondelli RF, Soares AF, Pangrazio EG, Wang L, Ishikiriama SK, Bombonatti JF - J Appl Oral Sci (2016)

Schematic drawing of experimental set up showing the starting temperature before light activation
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4836920&req=5

f02: Schematic drawing of experimental set up showing the starting temperature before light activation
Mentions: A single, human central upper incisor was used throughout the test. This tooth was donated from an organ bank of the Bauru School of Dentistry (FOB-USP), having obtained approval by the ethics committee of the institution through process no. 002/2008. The root of the tooth was sectioned 2 mm below the cementoenamel junction, perpendicular to the long axis of the tooth, using a slow speed diamond disc (Isomet, Buehler Ltd., Lake Bluff, IL, USA). The apical foramen of the root canal was enlarged using a #2135 diamond bur (KG Sorensen, Cotia, SP, Brazil) and all pulp tissue remnants were removed from the pulp chamber. The empty pulp chamber was filled with a heat absorption compound (Termal Paste, Implastec, Votorantim, SP, Brazil; 55.15.3243.3788) to simulate the pulp tissue as a heat conducting medium. A thin K-type thermocouple probe (MT 401A, Minilpa Ind. Com. Ltda., São Paulo, SP, Brazil) was inserted into the pulp chamber through the apical foramen and placed at its most coronal level. Its position was radiographically checked. During the testing procedure, the root surface of the tooth was partially submerged into a water bath at 37±1°C (Figure 2).

Bottom Line: The use of light sources in the bleaching process reduces the time required and promotes satisfactory results.Temperature increase values were compared by two-way ANOVA and Tukey´s tests (p<0.05).The green LED unit with and without gel application did not produce any significant intrapulpal temperature variations.

View Article: PubMed Central - PubMed

Affiliation: Departamento de Dentística, Endodontia e Materiais Odontológicos, Faculdade de Odontologia de Bauru, Universidade de São Paulo, Bauru, SP, Brasil.

ABSTRACT
The use of light sources in the bleaching process reduces the time required and promotes satisfactory results. However, these light sources can cause an increase in the pulp temperature. Objective The purpose of the present study was to measure the increase in intrapulpal temperature induced by different light-activated bleaching procedures with and without the use of a bleaching gel. Material and Methods A human maxillary central incisor was sectioned 2 mm below the cementoenamel junction. A K-type thermocouple probe was introduced into the pulp chamber. A 35% hydrogen peroxide bleaching gel was applied to the vestibular tooth surface. The light units used were a conventional halogen, a hybrid light (only LED and LED/Laser), a high intensity LED, and a green LED light. Temperature increase values were compared by two-way ANOVA and Tukey´s tests (p<0.05). Results There were statistically significant differences in temperature increases between the different light sources used and between the same light sources with and without the use of a bleaching gel. The presence of a bleaching gel generated an increase in intra-pulpal temperature in groups activated with halogen light, hybrid light, and high intensity LED. Compared to the other light sources, the conventional halogen lamp applied over the bleaching gel induced a significant increase in temperature (3.83±0.41°C). The green LED unit with and without gel application did not produce any significant intrapulpal temperature variations. Conclusion In the present study, the conventional halogen lamp caused the highest increase in intrapulpal temperature, and the green LED caused the least. There was an increase in temperature with all lights tested and the maximum temperature remained below the critical level (5.5°C). The addition of a bleaching gel led to a higher increase in intrapulpal temperatures.

No MeSH data available.