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Physicochemical properties, cytotoxicity, and penetration into dentinal tubules of calcium hypochlorite with or without surfactants

Grant number: 18/24662-6
Support Opportunities:Scholarships in Brazil - Doctorate
Effective date (Start): March 01, 2019
Effective date (End): September 30, 2022
Field of knowledge:Health Sciences - Dentistry - Endodontics
Principal Investigator:Gisele Faria
Grantee:Eric Hernán Coaguila Llerena
Host Institution: Faculdade de Odontologia (FOAr). Universidade Estadual Paulista (UNESP). Campus de Araraquara. Araraquara , SP, Brazil


Since the root canal irrigants may contact with the periapical tissues, it should be taken into consideration its possible cytotoxic effects. In addition, the physicochemical properties and the ability to penetrate areas not reached by the instruments are essential for the disinfection of the root canal system. Calcium hypochlorite [Ca(OCl)2] has been suggested as a potential alternative irrigant to sodium hypochlorite (NaOCl). The aim of this study will be to assess the physicochemical properties (part 1), cytotoxicity and effect on the biology of osteoblasts (part 2) and penetration into dentinal tubules (part 3) of Ca(OCl)2 with or without surfactants compared to NaOCl. In part 1, the physicochemical properties of NaOCl and Ca(OCl)2 with or without the surfactants Tween 80 (T80), Triton X-100 (TRX), benzalkonium chloride (BAK) or cetrimide will be evaluated. The pH will be assessed by using digital pH-meter, the surface tension by pendant drop method and the free active chlorine by spectrophotometry. In part 2, L929 fibroblasts or osteoblasts-like Saos2 in culture will be exposed to NaOCl and Ca(OCl)2 in association or not to with surfactants. The cell viability will be evaluated by means of the methyltetrazolium (MTT) and neutral red assays, the cytoskeleton by means of actin labeling, the type of cell death by flow cytometry, the ultrastructure by transmission electron microscopy and the activity of phosphatase alkaline by the calculation of thymolphthalein release. In part 3, single-rooted human teeth will be instrumented, stained with crystal violet and irrigated with NaOCl or Ca(OCl)2 associated or not with surfactants. The penetration into dentin will be evaluated at the cervical, middle and apical thirds. The statistical analysis of the results will be carried out using a significance level of 5%. The statistical tests will be chosen according to the distribution and homoscedasticity of the data. Ultimately, it is our expectation to obtain information to understand more deeply the mechanism of action of Ca(OCl)2 on eukaryotic cells, its physicochemical properties and penetration into dentinal tubules to provide subsidies for its indication or not in the endodontic clinic. (AU)

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Scientific publications (8)
(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)
HARADA, TAKESHI; HARADA, KAZUMA; NOZOE, AKIRA; TANAKA, SUSUMU; KOGO, MIKIHIKO. Novel Surgical Approach for the Successful Removal of Overextruded Separated Endodontic Instrument. JOURNAL OF ENDODONTICS, v. 47, n. 12, p. 1942-1952, . (18/24662-6)
TEVES, ABEL; BLANCO, DANIEL; CASARETTO, MARIO; TORRES, JOHN; ALVARADO, DEBORA E.; COAGUILA-LLERENA, HERNAN; FARIA, GISELE; JARAMILLO, DAVID E.. Multispecies biofilm removal by XP-endo Finisher and passive ultrasonic irrigation: A scanning electron microscopy study. AUSTRALIAN ENDODONTIC JOURNAL, . (18/24662-6)
HERNÁN COAGUILA-LLERENA; JULIA DA SILVA TOLEDO; ANA PAULA RAMOS; GISELE FARIA. Physicochemical properties and penetration into dentinal tubules of calcium hypochlorite with surfactants. Brazilian Dental Journal, v. 33, n. 2, p. 1-11, . (18/24662-6)
VICTOR MANUEL OCHOA-RODRÍGUEZ; JORGE HOMERO WILCHES-VISBAL; BARBARA ROMA; HERNÁN COAGUILA-LLERENA; MÁRIO TANOMARU-FILHO; ANDRÉA GONÇALVES; RUBENS SPIN-NETO; GISELE FARIA. Radiopacity of endodontic materials using two models for conversion to millimeters of aluminum. Brazilian Oral Research, v. 34, . (18/24662-6)
COAGUILA-LLERENA, H.; RODRIGUES, E. M.; SANTOS, C. S.; RAMOS, S. G.; MEDEIROS, M. C.; CHAVEZ-ANDRADE, G. M.; GUERREIRO-TANOMARU, J. M.; TANOMARU-FILHO, M.; FARIA, G.. Effects of octenidine applied alone or mixed with sodium hypochlorite on eukaryotic cells. International Endodontic Journal, v. 53, n. 9, . (18/24662-6)
KENNIA SCAPIN VIOLA; HERNÁN COAGUILA-LLERENA; ELISANDRA MARCIA RODRIGUES; CÍNTIA SILVA SANTOS; GISSELLE MORAIMA CHÁVEZ-ANDRADE; MIRIAM GRAZIELE MAGRO; MARIO TANOMARU-FILHO; JULIANE MARIA GUERREIRO-TANOMARU; GISELE FARIA. Different formulations of peracetic acid: effects on smear layer removal, dentine erosion, cytotoxicity and antibiofilm activity. Journal of Applied Oral Science, v. 30, . (18/24662-6, 12/18203-2, 17/05784-0)
MANUEL PALOMINO-DELGADO; HERNÁN COAGUILA-LLERENA; CARLOS MENDIOLA-AQUINO; GISELE FARIA. Management of unfavorable iatrogenic perforations during post placement using mineral trioxide aggregate: report of two cases. Revista Estomatológica Herediana, v. 31, n. 4, p. 311-316, . (18/24662-6)
HERNÁN COAGUILA-LLERENA; VICTOR MANUEL OCHOA-RODRIGUEZ; GABRIELA MARIANA CASTRO-NÚÑEZ; GISELE FARIA; JULIANE MARIA GUERREIRO-TANOMARU; MARIO TANOMARU-FILHO. Physicochemical Properties of a Bioceramic Repair Material - BioMTA. Brazilian Dental Journal, v. 31, n. 5, p. 511-515, . (18/24662-6)
Academic Publications
(References retrieved automatically from State of São Paulo Research Institutions)
LLERENA, Eric Hernán Coaguila. Root canal irrigation: physicochemical and biological properties of calcium hypochlorite and effects of the GentleWave system in endodontic treatment. 2022. Doctoral Thesis - Universidade Estadual Paulista (Unesp). Faculdade de Odontologia. Araraquara Araraquara.

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