title: Radiopacities of glass ionomer cements measured with direct digital radiographic system.
abstract: OBJECTIVE
  The purpose of this study was to determine and compare the radiopacities of 5 glass ionomer cements (GICs) of different thickness using a digital radiographic system-storage phosphor plate.
  
  
  METHODS
  The GICs tested were Vitremer, Vitrofil LC, Magic Glass,  Vitromolar, and Maxxion, distributed into the orifices of 16 acrylic plates made to a thickness of 2 mm, 3 mm, 5 mm, and 6 mm. Each plate was radiographed 3 times, and the images obtained were processed by computer. The images were read 3 times using the VixWin 2000 program, totaling 720 readings  of radiographic density. One-way analysis of variance was applied for statistical analysis with identification of differ- ences using Scheffe's multiple comparisons test (α=5%).
  
  
  RESULTS
  All the GICs varied in radiopacity according to thickness. Maxxion showedthe lowest value  of radiopacity, whereas Magic Glass displayed the highest level of radiopacity at all thicknesses studied. However, Vitremer and Vitrofil LC showed similar results.
  
  
  CONCLUSIONS
  It is important to know GIC radiopacities to help differentiate them from tooth structure and carious  lesions as well as to use them correctly.
authors: Department of Preventive Dentistry, the Pontifical Catholic University of Rio Grande do Sul, Porto Alegre, Brazil. pristona@hotmail.com
authors: Priscila
authors: P
authors: Stona
authors: Silvia Markus
authors: SM
authors: Bertella
authors: Maria Ivete Bolzan
authors: MI
authors: Rockenbach
authors: Rejane Maria
authors: RM
authors: Holderbaum
authors: João Batista Blessmann
authors: JB
authors: Weber
mesh_terms: D000704:Analysis of Variance; D003188:Composite Resins / Q000737:chemistry; D005899:Glass Ionomer Cements / Q000737:chemistry*; D008422:Materials Testing; D019252:Radiography, Dental, Digital / Q000379:methods*; D013499:Surface Properties
chemical_list: D003188:Composite Resins; D005899:Glass Ionomer Cements; C577193:Magic Glass; C577194:Maxxion; C084550:Vitremer; C577192:Vitrofil LC; C577195:Vitromolar