Diametral tensile strength and film thickness of an experimental dental luting agent derived from castor oil

Author(s)

Juliana Cabrini Carmello ^[1] ; Laiza Maria Grassi Fais ^[1] ; Lígia Nunes de Moraes Ribeiro ^[3] ; Salvador Claro Neto ^[3] ; Dalton Geraldo Guaglianoni ^[4] ; Lígia Antunes Pereira Pinelli ^[6]

Affiliation

^[1] UNESPUniv Estadual Paulista, Araraquara Dent Sch, Dept Dent Mat & Prosthodont, Araraquara, SP - Brazil

^[2] Univ. Estadual Paulista. Araraquara Dental School. Department of Dental Materials and Prosthodontics - Brasil

^[3] Univ Sao Paulo, Inst Chem Sao Carlos, Dept Chem & Mol Phys, Sao Carlos, SP - Brazil

^[4] UNESP Univ Estadual Paulista, Coll Letters & Sci, Dept Educ, Araraquara, SP - Brazil

^[5] Univ. Estadual Paulista. Araraquara Dental School. Department of Dental Materials and Prosthodontics - Brasil

• Document type: Journal article
• Source: Journal of Applied Oral Science; v. 20, n. 1, p. 16-20, 2012-02-00.

Abstract

The need to develop new dental luting agents in order to improve the success of treatments has greatly motivated research. OBJECTIVE: The aim of this study was to evaluate the diametral tensile strength (DTS) and film thickness (FT) of an experimental dental luting agent derived from castor oil (COP) with or without addition of different quantities of filler (calcium carbonate - CaCO3). MATERIAL AND METHODS: Eighty specimens were manufactured (DTS N=40; FT N=40) and divided into 4 groups: Pure COP; COP 10%; COP 50% and zinc phosphate (control). The cements were mixed according to the manufacturers' recommendations and submitted to the tests. The DTS test was performed in the MTS 810 testing machine (10 KN, 0.5 mm/min). For FT test, the cements were sandwiched between two glass plates (2 cm²) and a load of 15 kg was applied vertically on the top of the specimen for 10 min. The data were analyzed by means of one-way ANOVA and Tukey's test (α=0.05). RESULTS: The values of DTS (MPa) were: Pure COP- 10.94±1.30; COP 10%- 30.06±0.64; COP 50%- 29.87±0.27; zinc phosphate- 4.88±0.96. The values of FT (µm) were: Pure COP- 31.09±3.16; COP 10%- 17.05±4.83; COP 50%- 13.03±4.83; Zinc Phosphate- 20.00±0.12. One-way ANOVA showed statistically significant differences among the groups (DTS - p=1.01E-40; FT - p=2.4E-10). CONCLUSION: The experimental dental luting agent with 50% of filler showed the best diametral tensile strength and film thickness. (AU)