Revista de Odontologia da UNESP
ISSN 1807-2577 (Eletrônico)
Artigo Original

Influence of whitening gel on pulp chamber temperature rise by in-office bleaching technique

Influência do gel clareador no aumento da temperatura intra-câmara pulpar pela técnica do clareamento em consultório

Loretto, Sandro Cordeiro; Libdy, Mylena Ranieri; Ribeiro, Fabiola do Socorro da R.; Braga, Esther Marina F.; Carneiro, Karina Gama K.; Souza Junior, Mario Honorato S. e

Abstract

Introduction: Dental bleaching is a conservative method for the aesthetic restoration of stained teeth. However, whitening treatments are likely to cause adverse effects when not well planned and executed. Objective: This study evaluated the influence of whitening gel on temperature rise in the pulp chamber, using the in-office photoactivated dental bleaching technique. Material and method: The root portion of an upper central human incisor was sectioned 3mm below the cemento-enamel junction. The root canal was enlarged to permit the insertion of the K-type thermocouple sensor (MT-401) into the pulp chamber, which was filled with thermal paste to facilitate the transfer of heat during bleaching. Three photosensitive whitening agents (35% hydrogen peroxide) were used: Whiteness HP (FGM), Whiteness HP Maxx (FGM) and Lase Peroxide Sensy (DMC). An LED photocuring light (Flash Lite – Discus Dental) was used to activate the whitening gels. Six bleaching cycles were performed on each group tested. The results were submitted to one-way ANOVA and LSD t-test (α≤0.05). Result: The lowest mean temperature variation (°C) was detected for Lase Peroxide Sensy (0.20), while the highest was recorded for Whiteness HP (1.50). Conclusion: The Whiteness HP and Whiteness HP Maxx whitening gels significantly affected the temperature rise in the pulp chamber during bleaching, and this variation was dependent on the type of whitening gel used.

Keywords

Dental bleaching, high temperature, pulp cavity

Resumo

Introdução: O clareamento dental representa uma manobra conservadora na recuperação estética de dentes com alterações cromáticas. Contudo, os tratamentos clareadores são passíveis de causar efeitos adversos, quando não bem planejados e executados. Objetivo: Este estudo avaliou a influência do gel clareador no aumento da temperatura intra-câmara pulpar através da técnica de clareamento dental fotoativado realizado em consultório. Material e método: Um incisivo central superior humano foi seccionado na porção radicular 3 mm abaixo da junção cemento‑esmalte. O canal radicular foi alargado para permitir a introdução do sensor do termômetro na câmara pulpar, a qual foi preenchida com pasta térmica, favorecendo a transferência de calor das paredes dentárias para o sensor do termômetro digital com termopar tipo K (MT- 401A) durante o clareamento. Três agentes clareadores fotossensíveis (peróxido de hidrogênio a 35%) foram utilizados, sendo: Whiteness HP (FGM), Whiteness HP Maxx (FGM) e Lase Peroxide Sensy (DMC). Um aparelho fotopolimerizador de led (Flash Lite – Discus Dental) foi empregado para a ativação dos géis clareadores. Seis ciclos de clareamento foram realizados para cada grupo testado. Os resultados foram submetidos à ANOVA de um critério e ao teste t (LSD) (α≤0,05). Resultado: A menor média de variação de temperatura (°C) foi observada com o Lase Peroxide Sensy (0,20), enquanto que a maior com o Whiteness HP (1,50). Conclusão: Os géis clareadores Whiteness HP e Whiteness HP Maxx interferiram significativamente no aumento da temperatura intra-câmara pulpar durante o clareamento, sendo esta variação dependente do tipo de gel clareador empregado.

Palavras-chave

Clareamento dental, temperatura alta, cavidade pulpar

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