Gabriele Barbosa Torres1, Tânia Mara da Silva2, Rosanna Tarkany Basting3, Enrico Coser Bridi4, Fabiana Mantovani Gomes França5, Cecilia Pedroso Turssi6, Flávia Lucisano Botelho do Amaral7, Sérgio Eduardo de Paiva Gonçalves8, Roberta Tarkany Basting9. 1. São Leopoldo Mandic Dental School and Research Center, Rua José Rocha Junqueira 13, Bairro Swift, Campinas, CEP: 13045-755, São Paulo, Brazil. Electronic address: gabrielebtorres@hotmail.com. 2. Institute of Science and Technology of São José dos Campos, UNESP-Universidade Estadual Paulista, Avenida Engenheiro Francisco José Longo, 777, Jardim São Dimas, São José dos Campos, CEP: 12245-000, São Paulo, Brazil. Electronic address: tania.silva@ict.unesp.br. 3. Faculty of Medical Science (FCM), University of Campinas (UNICAMP), Rua Tessália Vieira de Camargo, 126 - Cidade Universitária Zeferino Vaz, Campinas, CEP: 13083-887, São Paulo, Brazil. Electronic address: rosannatb@gmail.com. 4. São Leopoldo Mandic Dental School and Research Center, Rua José Rocha Junqueira 13, Bairro Swift, Campinas, CEP: 13045-755, São Paulo, Brazil. Electronic address: enricobridi@gmail.com. 5. São Leopoldo Mandic Dental School and Research Center, Rua José Rocha Junqueira 13, Bairro Swift, Campinas, CEP: 13045-755, São Paulo, Brazil. Electronic address: biagomes@yahoo.com. 6. São Leopoldo Mandic Dental School and Research Center, Rua José Rocha Junqueira 13, Bairro Swift, Campinas, CEP: 13045-755, São Paulo, Brazil. Electronic address: cecilia.turssi@gmail.com. 7. São Leopoldo Mandic Dental School and Research Center, Rua José Rocha Junqueira 13, Bairro Swift, Campinas, CEP: 13045-755, São Paulo, Brazil. Electronic address: flbamaral@gmail.com. 8. Institute of Science and Technology of São José dos Campos, UNESP-Universidade Estadual Paulista, Avenida Engenheiro Francisco José Longo, 777, Jardim São Dimas, São José dos Campos, CEP: 12245-000, São Paulo, Brazil. Electronic address: sergio@ict.unesp.br. 9. São Leopoldo Mandic Dental School and Research Center, Rua José Rocha Junqueira 13, Bairro Swift, Campinas, CEP: 13045-755, São Paulo, Brazil. Electronic address: rbasting@yahoo.com.
Abstract
OBJECTIVES: To evaluate the bond strength to superficial (SD) and deep (DD) dentin after the use of 2.5% (T2.5%) or 4% (T4%) titanium tetrafluoride (TiF4) in aqueous solution as a dentin pretreatment, or when incorporated into the primer (T2.5%P and T4%P) of an adhesive system (Clearfil SE Bond/CL). Degree of conversion (DC), particle size (PS), polydispersity index (PI) and zeta potential (ZP) of the solutions were evaluated. METHODS: Fifty molars were sectioned longitudinally to obtain two slices of each tooth, which were demarcated into SD and DD. Treatments were applied (n=10): CL; T2.5%; T4%; T2.5%P; T4%P. After 24h or 180days storage, microshear bond strength tests were performed. The DC values of T2.5%P and T4%P were evaluated by FTIR. PS, PI and ZP were measured using dynamic light scattering. RESULTS: Analysis of mixed models showed significant effect of concentration of TiF4 * solution * storage time (p=0.0075). There were higher bond strength values in SD than in DD (p=0.0105) for all treatments in both times. The failure mode showed adhesive failures in the majority of groups, irrespective of depth and time (p=0.3746). The bond strength values were not affected by treatments. Lower average particle size was observed for T2.5%P and T4%P at baseline. T2.5% and T4% showed a trend towards agglomeration. SIGNIFICANCE: Higher bond strength values were achieved at SD for all treatments and times. The failure modes observed were adhesive. TiF4 incorporation did not affect DC. T2.5%P and T4%P presented excellent stability over time.
OBJECTIVES: To evaluate the bond strength to superficial (SD) and deep (DD) dentin after the use of 2.5% (T2.5%) or 4% (T4%) titanium tetrafluoride (TiF4) in aqueous solution as a dentin pretreatment, or when incorporated into the primer (T2.5%P and T4%P) of an adhesive system (Clearfil SE Bond/CL). Degree of conversion (DC), particle size (PS), polydispersity index (PI) and zeta potential (ZP) of the solutions were evaluated. METHODS: Fifty molars were sectioned longitudinally to obtain two slices of each tooth, which were demarcated into SD and DD. Treatments were applied (n=10): CL; T2.5%; T4%; T2.5%P; T4%P. After 24h or 180days storage, microshear bond strength tests were performed. The DC values of T2.5%P and T4%P were evaluated by FTIR. PS, PI and ZP were measured using dynamic light scattering. RESULTS: Analysis of mixed models showed significant effect of concentration of TiF4 * solution * storage time (p=0.0075). There were higher bond strength values in SD than in DD (p=0.0105) for all treatments in both times. The failure mode showed adhesive failures in the majority of groups, irrespective of depth and time (p=0.3746). The bond strength values were not affected by treatments. Lower average particle size was observed for T2.5%P and T4%P at baseline. T2.5% and T4% showed a trend towards agglomeration. SIGNIFICANCE: Higher bond strength values were achieved at SD for all treatments and times. The failure modes observed were adhesive. TiF4 incorporation did not affect DC. T2.5%P and T4%P presented excellent stability over time.