Journal of Conservative Dentistry
Home About us Editorial Board Instructions Submission Subscribe Advertise Contact e-Alerts Login 
Users Online: 1057
Print this page  Email this page Bookmark this page Small font sizeDefault font sizeIncrease font size
ORIGINAL ARTICLE
Year : 2012  |  Volume : 15  |  Issue : 3  |  Page : 237-241

Evaluation of Vickers hardness and depth of cure of six composite resins photo-activated with different polymerization modes


Department of Operative Dentistry, University of Pavia, Policlinico "San Matteo", Piazzale Golgi 2, 27100 Pavia, Italy

Correspondence Address:
C Poggio
Department of Operative Dentistry, University of Pavia, Policlinico "San Matteo", Piazzale Golgi 2, 27100, Pavia
Italy
Login to access the Email id

Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0972-0707.97946

Rights and Permissions

Aim: The current in vitro study evaluated Vickers hardness (VK) and depth of cure (hardness ratio) of six resin composites, polymerized with a light-emitting diode (LED) curing unit by different polymerization modes: Standard 20 s, Standard 40 s, Soft-start 40 s. Materials and Methods: Six resin composites were selected for the present study: three microhybrid (Esthet.X HD, Amaris, Filtek Silorane), two nanohybrid (Grandio, Ceram.X mono) and one nanofilled (Filtek Supreme XT). The VK of the surface was determined with a microhardness tester using a Vickers diamond indenter and a 200 g load applied for 15 seconds. The mean VK and hardness ratio of the specimens were calculated using the formula: hardness ratio = VK of bottom surface / VK of top surface. Results: For all the materials tested and with all the polymerization modes, hardness ratio was higher than the minimum value indicated in literature in order to consider the bottom surface as adequately cured (0.80). Curing time did not affect hardness ratio values for Filtek Silorane, Grandio and Filtek Supreme XT. Conclusion: The effectiveness of cure at the top and bottom surface was not affected by Soft-start polymerization mode.


[FULL TEXT] [PDF]*
Print this article     Email this article
 Next article
 Previous article
 Table of Contents

 Similar in PUBMED
   Search Pubmed for
   Search in Google Scholar for
 Related articles
 Citation Manager
 Access Statistics
 Reader Comments
 Email Alert *
 Add to My List *
 * Requires registration (Free)
 

 Article Access Statistics
    Viewed4615    
    Printed106    
    Emailed0    
    PDF Downloaded263    
    Comments [Add]    
    Cited by others 7    

Recommend this journal