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      Resistência ao cisalhamento de dentes submetidos a duas técnicas de clareamento, pós-restaurados ou não Translated title: Shear strength in teeth subjected to two bleaching techniques, post-restoration or otherwise

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          Abstract

          Os autores testaram a resistência ao cisalhamento de dentes submetidos a duas técnicas de clareamento. Foram utilizados 50 incisivos centrais superiores, divididos em 5 grupos, a saber: controle (só abertura coronária), clareamento sem calor, clareamento catalisado por calor controlado, clareamento catalisado por calor controlado e restauração com resina composta de última geração e dentes hígidos. Após o teste de cisalhamento, constatou-se que, nos dentes submetidos ao clareamento dental com perborato de sódio/Peridrol com ou sem aplicações de calor controlado, apesar de estes apresentarem leve diminuição da resistência ao cisalhamento, esta não é estatisticamente significante quando comparada com a dos dentes em que se executa o acesso endodôntico sem clareamento. A restauração do dente após o clareamento dental com adesivo dentinário de 4ª geração e resina fotopolimerizada aumenta a resistência do elemento dental clareado. Não existem diferenças estatísticas de resistência ao cisalhamento entre dentes clareados sem o uso de calor e aqueles em que o calor foi empregado de forma controlada, como preconizado neste estudo. Dentes hígidos apresentam resistência maior do que os dentes clareados com calor, sem calor e aqueles não clareados, com significância estatística no nível de 5%. Já com os dentes clareados e restaurados, os dentes hígidos não mostraram diferenças estatísticas significantes

          Translated abstract

          The authors tested the shear strength in teeth subjected to two bleaching techniques with use of 50 upper central incisors divided into 5 groups, namely: control (intracoronal access only), bleaching without heat, bleaching catalyzed by controlled heat, bleaching catalyzed by controlled heat and restored with last generation composite resin, and sound teeth. Following the shearing test it was observed that teeth subjected to dental bleaching with sodium perborate/Peridrol with or without applications of controlled heat, although they presented a slight reduction in shear strength, this was not statistically significant as compared to that from teeth where endodontic access was effected without bleaching. Restoration of the tooth subsequently to dental bleaching with fourth generation dentinal adhesive and photopolymerized resin augments the resistance of the bleached dental element. There are no statistical differences between resistance to shear in bleached teeth without the use of heat with those where heat was employed in a controlled form as preconized in this study. Sound teeth present greater resistance than teeth bleached with heat, without heat, and those not bleached with statistical significance at the level of 5%. When compared to teeth bleached and restored, they did not present significant statistical differences

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          Most cited references12

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          Effect of bleaching agents on inorganic components of human dentin and cementum.

          The effect of bleaching agents on the inorganic composition of human dentin and cementum was examined. Intact teeth were crushed, pulverized, and separated to dentin and cementum powders. The pulverized tissues were exposed to treatments with 30% H2O2, 3% H2O2, 2% sodium perborate in 30% H2O2, 2% sodium perborate in 3% H2O2, and 2% sodium perborate in bidistilled water for periods of 15 min and 1, 24, and 72 h. The degree of dissolution and the percentage of inorganic material for both dentin and cementum were measured. Thirty percent H2O2 and 2% sodium perborate in 30% H2O2 treatments significantly increased the solubility of dentin and cementum. The degree of dissolutions and the percentage of inorganic material remaining in the undissolved dentin and cementum increased with time progression. The greatest increase occurred with 30% H2O2 and 2% sodium perborate in 30% H2O2 after 24- and 72-h treatments. It is concluded that 30% hydrogen peroxide treatment may cause alteration in the chemical structure of the dentin and cementum making them more susceptible to degradation.
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            Effect of intracoronal bleaching on external cervical root resorption.

            The purpose of this study was to examine histologically and radiographically the effect of a bleaching agent, a mixture of sodium perborate and superoxol (30% hydrogen peroxide), without a heat source on the cervical root surface and periodontal tissue of endodontically treated teeth of dogs. Endodontic treatment was performed on anterior teeth of dogs. The endodontically treated teeth were then divided into two groups. One group received walking bleach procedures, while the other group did not. The animals were killed at intervals of 1 and 3 months after bleaching for histological and radiographic examination. External cervical root resorption was only observed in bleached teeth at 3-month but not at 1-month observation.
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              Resistência à fratura de dentes despolpados tratados com agentes clareadores

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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Journal
                rousp
                Revista de Odontologia da Universidade de São Paulo
                Rev Odontol Univ São Paulo
                Universidade de São Paulo (São Paulo )
                0103-0663
                1997
                : 11
                : suppl 1
                Affiliations
                [1 ] Universidade de São Paulo Brazil
                [2 ] Universidade de São Paulo Brazil
                [3 ] Universidade de São Paulo Brazil
                Article
                S0103-06631997000500004
                10.1590/S0103-06631997000500004
                7ba0886b-4b36-465e-abcd-ac55a3987ec7

                http://creativecommons.org/licenses/by/4.0/

                History
                Product

                SciELO Brazil

                Self URI (journal page): http://www.scielo.br/scielo.php?script=sci_serial&pid=0103-0663&lng=en
                Categories
                DENTISTRY, ORAL SURGERY & MEDICINE

                Dentistry
                Endodontics,Dental bleaching,Endodontia,Clareamento de dentes
                Dentistry
                Endodontics, Dental bleaching, Endodontia, Clareamento de dentes

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