PMID- 20969514
OWN - NLM
STAT- MEDLINE
DCOM- 20110329
LR  - 20220408
IS  - 1502-3850 (Electronic)
IS  - 0001-6357 (Linking)
VI  - 69
IP  - 1
DP  - 2011 Jan
TI  - Influence of the interaction of light- and self-polymerization on subsurface 
      hardening of a dual-cured core build-up resin composite.
PG  - 41-7
LID - 10.3109/00016357.2010.517559 [doi]
AB  - OBJECTIVE: To investigate the influence of time delay and duration of 
      photo-activation on subsurface microhardness of a dual-cured resin composite. 
      MATERIAL AND METHODS: A commercially available dual-cured core build-up resin 
      composite (Rebilda DC) was filled in cavities (diameter: 4.0 mm; height: 6.0 mm) 
      of polystyrene molds and light-cured for 20 or 60 s either immediately after the 
      filling procedure (time delay 0 s) or after a time delay of 30, 90, 180 or 300 s. 
      Non-irradiated self-cured specimens served as a control group (n = 15). Specimens 
      were stored in complete darkness and at 100% relative humidity at 37 degrees C for 2 
      weeks and cross-sectioned. Knoop Hardness Numbers (KHNs) were measured six times 
      per depth and averaged at distances of 0.25, 0.50, 1.00, 2.00, 3.50 and 5.50 mm 
      from the light-exposed surface. Data were statistically analyzed using one- and 
      two-way ANOVA followed by Scheffe's post-hoc test at a level of significance of 
      0.05. RESULTS: Mean hardness values in all experimental groups ranged between 
      54.3 +/- 2.1 and 58.1 +/- 2.3 KHN. Light-curing did not significantly increase 
      composite KHN at any depth measured. Delaying light exposure had no influence on 
      KHN, irrespective of depth. A longer light-exposure time (60 versus 20 s) 
      resulted in significantly higher KHN only at depths of 3.50 and 5.50 mm. 
      CONCLUSION: Photo-activation of the tested dual-cured resin composite provided no 
      clinically relevant benefit compared to self-curing regarding the degree of 
      hardening.
FAU - Taubock, Tobias T
AU  - Taubock TT
AD  - Department of Preventive Dentistry, Periodontology and Cariology, Center for 
      Dental and Oral Medicine and Cranio-Maxillofacial Surgery, University of Zurich, 
      Switzerland. tobias.tauboeck@zzmk.uzh.ch
FAU - Buchalla, Wolfgang
AU  - Buchalla W
FAU - Hiltebrand, Urs
AU  - Hiltebrand U
FAU - Roos, Malgorzata
AU  - Roos M
FAU - Krejci, Ivo
AU  - Krejci I
FAU - Attin, Thomas
AU  - Attin T
LA  - eng
PT  - Journal Article
DEP - 20101025
PL  - Sweden
TA  - Acta Odontol Scand
JT  - Acta odontologica Scandinavica
JID - 0370344
RN  - 0 (Composite Resins)
RN  - 0 (Dentin-Bonding Agents)
RN  - 0 (rebilda DC)
SB  - IM
MH  - Composite Resins/*chemistry/radiation effects
MH  - Dentin-Bonding Agents/chemistry/radiation effects
MH  - Hardness
MH  - *Light-Curing of Dental Adhesives
MH  - Polymerization
MH  - *Self-Curing of Dental Resins
MH  - Time Factors
EDAT- 2010/10/26 06:00
MHDA- 2011/03/30 06:00
CRDT- 2010/10/26 06:00
PHST- 2010/10/26 06:00 [entrez]
PHST- 2010/10/26 06:00 [pubmed]
PHST- 2011/03/30 06:00 [medline]
AID - 10.3109/00016357.2010.517559 [doi]
PST - ppublish
SO  - Acta Odontol Scand. 2011 Jan;69(1):41-7. doi: 10.3109/00016357.2010.517559. Epub 
      2010 Oct 25.