Influence of the spatula type and manipulation surface on the Knoop hardness of glass ionomer cements/Influência do tipo de espátula e da superfície de manipulação na dureza Knoop dos cimentos de ionômero de vidro

Salomao-Miranda, F., Wanssa, N., Bonini, G.A.V.C., Raggio, D.P. ORCID: https://orcid.org/0000-0002-0048-2068 and Imparato, J.C.P. 2013. Influence of the spatula type and manipulation surface on the Knoop hardness of glass ionomer cements/Influência do tipo de espátula e da superfície de manipulação na dureza Knoop dos cimentos de ionômero de vidro. Pesquisa Brasileira em Odontopediatria e Clinica Integrada 13 (3) , pp. 225-231.

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Abstract

Objective: To evaluate the influence of different types of spatulas and manipulation surfaces on the Knoop hardness of the Brazilian glass ionomer cements Vitro Molar® (VTM) and Maxxion R® (MXR) and the imported Ketac Molar™ Easymix (KTX). Method: For each experimental condition, glass ionomer cements samples (7 mm diameter and 0.5 mm high) were fabricated and inserted in PVC molds to produce blocks for the microhardness reading. The experimental conditions were: C-I: plastic spatula + glass plate; C-II: metal spatula + glass plate; C-III: plastic spatula + paper mixing pad; CIV: metal spatula + paper mixing pad. Each sample received five indentations with a 25 g load for 5 s after 24 h and 30 days of fabrication. The obtained results were analyzed by repeated measures analysis of variance and Tukey's test at 5% significance level. Results: Microhardness of all glass ionomer cements increased after 30 days. The VTM cement was the most affected by the different manipulation conditions. After 24 h, VTM [29.6 (5.0)] and KTX [46.1 (9.4)] presented the highest microhardness values with C-I and MXR [46.2 (12.3)] presented the best result with C-IV. After 30 days, VTM [113.6 (17.7)] and KTX [82.4 (13.4)] maintained the highest microhardness values with C-I, and KTX [71.3 (17.6)] maintained the best result with C-IV. Conclusion: After 30 days, the different used manipulation conditions affected the final microhardness values of VTM and MXR glass ionomer cements. KTX was the least affected by the manipulation conditions.

Item Type:	Article
Status:	Published
Schools:	Dentistry
Last Modified:	10 Nov 2022 10:57
URI:	https://orca.cardiff.ac.uk/id/eprint/148789

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