DEPTH OF POLYMERIZATION OF A NEW NANOCOMPOSITE ACCORDING TO DIFFERENT EXPOSURE TIMES AND SHADES

Authors

  • Joo Loon Lui Department of Conservative Dentistry, Faculty of Dentistry, University of Malaya
  • C L Chan Department of Conservative Dentistry, Faculty of Dentistry, University of Malaya
  • K T Yap Department of Conservative Dentistry, Faculty of Dentistry, University of Malaya

Keywords:

depth of polymerization, nanocomposite, exposure time, shade

Abstract

The aim of the study was to determine the depth of cure of a new nanocomposite when exposed to different curing times and also when different shades were polymerized. The nanocomposite, Filtek Supreme (3M ESPE), was packed into 96 plastic cylindrical moulds measuring 4 mm in internal diameter and 8 mm in length and then polymerized using a conventional quartz-tungsten-halogen light curing unit. The first part of the study involved curing 16 samples each of A2 shade of the nanocomposite at exposure times of 20s, 40s, 60s and 120s. For the second part, a similar number of samples of the dentinal opacity shades of A2, B3 and A4 of the nanocomposite were polymerized at a constant exposure time of 40s. The depth of polymerization of the nanocomposite in each sample was measured using a digimatic indicator. Curing depths were found to increase significantly (P < 0.05) with longer exposure time (20s < 40s < 60s < 120s) and decrease significantly with darker shades (A2 > B3 > A4).

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Published

2018-06-30

Issue

Vol. 13 No. 1 (2006)

Section

Original/Research Article

License

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