Physico-chemical and mecanichal evaluation of mineral trioxide aggregate based root canal sealers in comparison to AH Plus and Sealapex.

• Grant number: 10/17976-2
• Support type: Scholarships in Brazil - Doctorate
• Effective date (Start): March 01, 2011
• Effective date (End): January 31, 2014
• Field of knowledge: Health Sciences - Dentistry - Endodontics
• Principal researcher: Mario Tanomaru Filho
• Grantee: Raqueli Viapiana
• Home Institution: Faculdade de Odontologia (FOAr). Universidade Estadual Paulista (UNESP). Campus de Araraquara. Araraquara , SP, Brazil
• Associated scholarship(s): 12/11035-7 - Chemical microstructure analisys and sealing ability of MTA-based root canal sealers under different humidity environmental conditions, BE.EP.DR

Abstract

The aim of this study is to evaluate the setting time, compressive strength, flow ability, film thickness, radiopacity, solubility, pH and calcium ion release of the root canal sealers MTA Fillapex, Sealapex, AH Plus and two experimental formulations of MTA based root canal sealers containing different radiopacifiers (zirconium oxide and niobium oxide in nano or micro particle size). Five specimens will be confectioned with standardized dimensions to analyze the setting time, compressive strength, flow ability, radiopacity, solubility, pH and calcium ion release. To evaluate the setting time of the root canal sealers, circular molds will be filled with the sealers and after 150 s Gilmore needle will be used to test the sealer surface. To test the compressive strength, cylinders of the root canal sealers will be confectioned and submitted to fracture in the EMIC DL universal machine after 24 h and 21 days. The flow ability test will follow the ISO 6876 varying the methodology measurement of the specimens and the film thickness will be measure through the difference in thickness of two glass slabs with the root canal sealers interposed between them. To evaluate the solubility of the sealers, the percentage loss in weight will be determined after 28 day. The pH will be measured using a digital pHmeter and the calcium ion release will be quantified after 1, 7, 14, 21 and 28 days of immersion of specimens in distilled water by atomic absorption spectrometry. To test radiopacity, the specimens will be radiographed and compared with an aluminum scale with different thickness. The adhesion of the root canal sealers to dentin will be determined by push-out test. Finally, the inorganic composition and formaldehyde release by the root canal sealers will be verified by x-Ray difractrometry and chromatography, respectively. The results will be submitted to statistical analysis using ANOVA test and Tukey post-hoc test with 95% confidence interval.

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

VIAPIANA, R.; FLUMIGNAN, D. L.; GUERREIRO-TANOMARU, J. M.; CAMILLERI, J.; TANOMARU-FILHO, M. Physicochemical and mechanical properties of zirconium oxide and niobium oxide modified Portland cement-based experimental endodontic sealers. International Endodontic Journal, v. 47, n. 5, p. 437-448, MAY 2014. Web of Science Citations: 28.

VIAPIANA, RAQUELI; GUERREIRO-TANOMARU, JULIANE MARIA; TANOMARU-FILHO, MARIO; CAMILLERI, JOSETTE. Investigation of the Effect of Sealer Use on the Heat Generated at the External Root Surface during Root Canal Obturation Using Warm Vertical Compaction Technique with System B Heat Source. JOURNAL OF ENDODONTICS, v. 40, n. 4, p. 555-561, APR 2014. Web of Science Citations: 13.

VIAPIANA, RAQUELI; GUERREIRO-TANOMARU, J.; TANOMARU-FILHO, M.; CAMILLERI, J. Interface of dentine to root canal sealers. Journal of Dentistry, v. 42, n. 3, p. 336-350, MAR 2014. Web of Science Citations: 6.