Search Results

You are looking at 1 - 3 of 3 items for

  • Author or Editor: Y. A. Ribeiro x
  • All content x
Clear All Modify Search
Journal of Thermal Analysis and Calorimetry
Authors: A. Gatti, A. Rastelli, S. Ribeiro, Y. Messaddeq, and V. Bagnato

Abstract  

Due to their excellent aesthetics, photopolymers have been extensively used in several dentistry applications. However, several problems are reported, e.g. low mechanical and abrasion resistance, shrinkage during polymerization, etc. Properties of the final restorations are intrinsically related to the polymerization stage, which can be conveniently studied by photocalorimetry. In the present work the polymerization reaction and the filler content of different photocurable commercial dental methacrylate-based composites were studied by means of photocalorimetry and thermogravimetry, respectively. The results show that the values of curing rate, the heat of polymerization and the filler content vary significantly from one composite to another.

Restricted access
Journal of Thermal Analysis and Calorimetry
Authors: G. C. A. Amaral, M. S. Crespi, C. A. Ribeiro, M. Y. Hikosaka, L. S. Guinesi, and A. F. Santos
Restricted access
Journal of Thermal Analysis and Calorimetry
Authors: Y. A. Ribeiro, J. D. S. de Oliveira, M. I. G. Leles, S. A. Juiz, and M. Ionashiro

Thermogravimetry, derivative thermogravimetry (TG, DTG) and differential scanning calorimetry (DSC), were used to study the thermal behaviour of mefenamic acid, ibuprofen, acetaminophen, sodium diclofenac, phenylbutazone, dipyrone and salicylamide. The results led to thermal stability data and also to the interpretation concerning the thermal decomposition.

Restricted access