Comparison of three digital systems in relation to the optical density of glass ionomer cements


  • Lisiane Hehn
  • Célia Regina Winck Mahl
  • Maria Perpétua Mota Freitas
  • Alexandre Conde
  • Elaine Bauer Veeck
  • Vania Fontanella


digital radiography, glass ionomer cements, radiopacity


The aim of this study was to compare three digital systems – two optical plates and a sensor – in relation to the optic density of three restoring glass ionomer cements. The samples confectioned with each one of the materials in thicknesses of 1, 2, 3 and 4 mm were positioned between the two halves of an extracted and sectioned premolar tooth crown and radiographed. The measures of optical density, in values of pixels, had been carried through in accordance with the specifications of the corresponding system used and analyzed by means of the nonparametric Friedman’s Test (α = 1%). The results had shown significant differences in the averages of the values of optical density among the digital systems. The great optical density had been determined in CYGNUS system, followed for the DENOPTIX and DIGORA (p ≤ 0.01). However, there were not statistical differences among variations of optical density associated with the increase in the thickness of the sample. Therefore, it can be concluded that, although the differences in the optical density, the tested systems present similar results when they express the variation in function of the thickness of the used material. UNITERMS: digital radiography; glass ionomer cements; radiopacity

Author Biographies

Lisiane Hehn

Mestre em Clínica Odontológica pela Universidade Federal do Rio Grande do Sul (UFRGS).

Célia Regina Winck Mahl

Mestre em Clínica Odontológica pela UFRGS.

Maria Perpétua Mota Freitas

Mestre em Ortodontia e Ortopedia Facial pela Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS).

Alexandre Conde

Doutor em Materiais Dentários pela FOPUCRS. Especialista em Dentística Restauradora – ABO/RS.

Elaine Bauer Veeck

Professora Titular de Radiologia da PUCRS.

Vania Fontanella

Professora do Programa de Pós-Graduação em Odontologia da UFRGS.






Original Article