Document Detail

Influence of light-exposure methods and depths of cavity on the microhardness of dual-cured core build-up resin composites.
MedLine Citation:
PMID:  24626248     Owner:  NLM     Status:  In-Data-Review    
Objective: The purpose of this study was to evaluate the Knoop hardness number (KHN) of dual-cured core build-up resin composites (DCBRCs) at 6 depths of cavity after 3 post-irradiation times by 4 light-exposure methods. Material and Methods: Five specimens each of DCBRCs (Clearfil DC Core Plus [DCP] and Unifil Core EM [UCE]) were filled in acrylic resin blocks with a semi-cylindrical cavity and light-cured using an LED light unit (power density: 1,000 mW/cm2)at the top surface by irradiation for 20 seconds (20 s), 40 seconds (40 s), bonding agent plus 20 seconds (B+20 s), or 40 seconds plus light irradiation of both sides of each acrylic resin block for 40 seconds each (120 s). KHN was measured at depths of 0.5, 2.0, 4.0, 6.0, 8.0, and 10.0 mm at 0.5 hours, 24 hours, and 7 days post-irradiation. Statistical analysis was performed using repeated measures ANOVA and Tukey's compromise post-hoc test with a significance level of p<0.05. Results: For both DCBRCs, at 0.5 hours post-irradiation, the 20 s and 40 s methods showed the highest KHN at depth of 0.5 mm. The 40 s method showed significantly higher KHN than the 20 s method at all depths of cavity and post-irradiation times, except UCE at depth of 0.5 mm (p<0.05). The 120 s method did not result in significantly different KHN at all depths of cavity and post-irradiation times (p>0.05). In DCP, and not UCE, at 24 hours and 7 days post-irradiation, the B+20 s method showed significantly higher KHN at all depths of cavity, except the depth of 0.5 mm (p<0.05). Conclusion: KHN depends on the light-exposure method, use of bonding agent, depth of cavity, post-irradiation time, and material brand. Based on the microhardness behavior, DCBRCs are preferably prepared by the effective exposure method, when used for a greater depth of cavity.
Keiichi Yoshida; Xiangfeng Meng
Related Documents :
15261868 - Long-range temporal correlations in alpha and beta oscillations: effect of arousal leve...
23759848 - Uniform illumination design by configuration of leds and optimization of led lens for l...
18094768 - Microfluidic flow-encoded switching for parallel control of dynamic cellular microenvir...
7290528 - Visual properties of cells in anterior dorsal ventricular ridge of turtle.
16061248 - Two different sensory mechanisms for the control of pupal protective coloration in butt...
15907358 - A comparison of the aspirating abilities of re-usable and partly disposable dental cart...
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of applied oral science : revista FOB     Volume:  22     ISSN:  1678-7765     ISO Abbreviation:  J Appl Oral Sci     Publication Date:    2014 Jan-Feb
Date Detail:
Created Date:  2014-03-14     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101189774     Medline TA:  J Appl Oral Sci     Country:  Brazil    
Other Details:
Languages:  eng     Pagination:  44-51     Citation Subset:  D; IM    
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

Previous Document:  Effect of fixed orthodontic appliances on salivary microbial parameters at 6 months: a controlled ob...
Next Document:  Finite element analysis of rapid canine retraction through reducing resistance and distraction.