R Osorio1, S Sauro2, T F Watson3, M Toledano1. 1. Dental Materials, School of Dentistry, University of Granada, Granada, Spain. 2. Dental Biomaterials and Minimally Invasive Dentistry, Departamento de Odontología, Facultad de Ciencias de la Salud, CEU-Cardenal Herrera University, Valencia, Spain. 3. Biomaterials, Biomimetics & Biophotonics, King's College London Dental Institute at Guy's Hospital, London, UK.
Abstract
AIM: To ascertain whether biomimetic phosphoprotein analogues (polyaspartic acid (PAS) and sodium trimetaphosphate (TMP)) improve bonding efficacy and dentine remineralization ability of a novel zinc-doped Portland-based resinous sealing cement. METHODOLOGY: Bonding procedures were performed on phosphoric acid-etched dentine, and several groups were established regarding biomimetic analogue application: (1) no application, (2) PAS-treated dentine and (3) dentine treated with a mixture of PAS and TMP. Raman spectroscopy and microtensile bond strength (MTBS) with fracture analysis by scanning electron microscopy were carried out. MTBS values were compared by anova, Student-Newman-Keuls and Student's t-tests (P < 0.05 and P < 0.01, respectively). RESULTS: Twenty-four hour MTBS values were not affected by the different bonding procedures. After 6 months, MTBS decreased in those groups in which the phosphoproteins analogues were not applied (P < 0.05). When PAS was applied, MTBS was maintained after 6 months (P > 0.05). The novel material bonded without primer application induced bioactive crystal (calcium carbonate and Ettringite) precipitation onto the etched dentine and augmented the degree of crystallinity at the hybrid layer. Mineral-to-matrix ratio was increased at the hybrid layer of the PAS-treated specimens; this primer was also able to catalyse dentine remineralization, without an increase in crystallinity. CONCLUSIONS: PAS application onto demineralized dentine produced an inhibition or delay of mineral phase crystallization, enhancing the remineralization potential of the Portland microfillers at the resin-dentine bonded interface.
AIM: To ascertain whether biomimetic phosphoprotein analogues (polyaspartic acid (PAS) and sodium trimetaphosphate (TMP)) improve bonding efficacy and dentine remineralization ability of a novel zinc-doped Portland-based resinous sealing cement. METHODOLOGY: Bonding procedures were performed on phosphoric acid-etched dentine, and several groups were established regarding biomimetic analogue application: (1) no application, (2) PAS-treated dentine and (3) dentine treated with a mixture of PAS and TMP. Raman spectroscopy and microtensile bond strength (MTBS) with fracture analysis by scanning electron microscopy were carried out. MTBS values were compared by anova, Student-Newman-Keuls and Student's t-tests (P < 0.05 and P < 0.01, respectively). RESULTS: Twenty-four hour MTBS values were not affected by the different bonding procedures. After 6 months, MTBS decreased in those groups in which the phosphoproteins analogues were not applied (P < 0.05). When PAS was applied, MTBS was maintained after 6 months (P > 0.05). The novel material bonded without primer application induced bioactive crystal (calcium carbonate and Ettringite) precipitation onto the etched dentine and augmented the degree of crystallinity at the hybrid layer. Mineral-to-matrix ratio was increased at the hybrid layer of the PAS-treated specimens; this primer was also able to catalyse dentine remineralization, without an increase in crystallinity. CONCLUSIONS:PAS application onto demineralized dentine produced an inhibition or delay of mineral phase crystallization, enhancing the remineralization potential of the Portland microfillers at the resin-dentine bonded interface.
Authors: Manuel Toledano; Esther Muñoz-Soto; Fátima S Aguilera; Estrella Osorio; Mayra C Pérez-Álvarez; José Ad García-Menocal; Manuel Toledano-Osorio; Raquel Osorio Journal: Clin Oral Investig Date: 2019-05-17 Impact factor: 3.573