Francine Benetti1, João Eduardo Gomes-Filho1, Luciana Louzada Ferreira1, Edilson Ervolino2, André Luiz Fraga Briso3, Gustavo Sivieri-Araújo1, Eloi Dezan-Júnior1, Luciano Tavares Angelo Cintra4. 1. Endodontics, São Paulo State University (Unesp), School of Dentistry, 16015-050, Araçatuba, SP, Brazil. 2. Basic Science, São Paulo State University (Unesp), School of Dentistry, 16015-050, Araçatuba, SP, Brazil. 3. Restorative Dentistry, São Paulo State University (Unesp), School of Dentistry, 16015-050, Araçatuba, SP, Brazil. 4. Endodontics, São Paulo State University (Unesp), School of Dentistry, 16015-050, Araçatuba, SP, Brazil. Electronic address: lucianocintra@foa.unesp.br.
Abstract
OBJECTIVE: This study provides an in vivo evaluation of the inflammatory response, levels of cell proliferation and apoptosis, and the presence of necrosis after dental bleaching with two concentrations of hydrogen peroxide (H2O2). DESIGN: Wistar rats were divided into Control (placebo gel), BLUE (20% H2O2, 1×50min), and MAXX (35% H2O2, 3×15min) groups. At 2 and 30days, the rats were killed (n=10). The jaws were processed for histology analysis and PCNA and Caspase-3-cleaved immunohistochemistry, and data were submitted to the Mann-Whitney or ANOVA test (P<0.05). RESULTS: At 2days, the MAXX group showed necrosis and the BLUE group revealed moderate inflammation on the occlusal third of the crown (P<0.05). At 30days, tertiary dentin had formed and there was an absence of inflammation. The level of cell proliferation was higher in the middle third of the BLUE group (P<0.05), and cervical of MAXX at 2days (P<0.05), decreasing at 30days. The apoptosis was present at 2days, particularly in the cervical third of the crown in the bleached groups (P<0.05), with a decrease only at 30days in the BLUE group (P<0.05). CONCLUSIONS: The concentration of H2O2 influences effects on the pulp tissue, where a higher concentration of H2O2 can cause necrosis in the pulp and a prolonged effect within the apoptotic process; lower concentrations of H2O2 provide moderate inflammation, cell proliferation and apoptosis with a reduction of these processes over time.
OBJECTIVE: This study provides an in vivo evaluation of the inflammatory response, levels of cell proliferation and apoptosis, and the presence of necrosis after dental bleaching with two concentrations of hydrogen peroxide (H2O2). DESIGN:Wistar rats were divided into Control (placebo gel), BLUE (20% H2O2, 1×50min), and MAXX (35% H2O2, 3×15min) groups. At 2 and 30days, the rats were killed (n=10). The jaws were processed for histology analysis and PCNA and Caspase-3-cleaved immunohistochemistry, and data were submitted to the Mann-Whitney or ANOVA test (P<0.05). RESULTS: At 2days, the MAXX group showed necrosis and the BLUE group revealed moderate inflammation on the occlusal third of the crown (P<0.05). At 30days, tertiary dentin had formed and there was an absence of inflammation. The level of cell proliferation was higher in the middle third of the BLUE group (P<0.05), and cervical of MAXX at 2days (P<0.05), decreasing at 30days. The apoptosis was present at 2days, particularly in the cervical third of the crown in the bleached groups (P<0.05), with a decrease only at 30days in the BLUE group (P<0.05). CONCLUSIONS: The concentration of H2O2 influences effects on the pulp tissue, where a higher concentration of H2O2 can cause necrosis in the pulp and a prolonged effect within the apoptotic process; lower concentrations of H2O2 provide moderate inflammation, cell proliferation and apoptosis with a reduction of these processes over time.
Authors: Rafael Antonio de Oliveira Ribeiro; Uxua Ortecho Zuta; Igor Paulino Mendes Soares; Caroline Anselmi; Diana Gabriela Soares; André Luiz Fraga Briso; Josimeri Hebling; Carlos Alberto de Souza Costa Journal: Clin Oral Investig Date: 2022-08-16 Impact factor: 3.606
Authors: Carmen Llena; Mar Collado-González; Christopher Joseph Tomás-Catalá; David García-Bernal; Ricardo Elías Oñate-Sánchez; Francisco Javier Rodríguez-Lozano; Leopoldo Forner Journal: Materials (Basel) Date: 2018-06-27 Impact factor: 3.623