Evaluation of Light Intensity Output of QTH and LED Curing Devices in Various Governmental Health Institutions

2011 ◽  
Vol 36 (4) ◽  
pp. 356-361 ◽  
Author(s):  
MM Al Shaafi ◽  
AM Maawadh ◽  
MQ Al Qahtani

Clinical Relevance Evaluating the intensity of a light curing unit regularly prior to the application of tooth-colored restorative materials is essential to assure the quality of restorative procedures.

10.2341/07-16 ◽  
2008 ◽  
Vol 33 (1) ◽  
pp. 23-30 ◽  
Author(s):  
A. Knezevic ◽  
D. Zeljezic ◽  
N. Kopjar ◽  
Z. Tarle

Clinical Relevance Curing light intensity is one of the main parameters for proper resin composite cure. Inadequate polymerization of a composite can be harmful to vital pulp tissue and can compromise the durability and quality of the final restoration.


2010 ◽  
Vol 35 (3) ◽  
pp. 353-361 ◽  
Author(s):  
S-H. Park ◽  
J-F. Roulet ◽  
S. D. Heintze

Clinical Relevance Because increase in temperature is related directly to light intensity and exposure time, curing devices with high power density (>1200 mW/cm2) should only be activated for a short time (<15 seconds), even in teeth without cavity preparation.


2017 ◽  
Vol 18 (1) ◽  
pp. 39-43
Author(s):  
Fahad Alkhudhairy

ABSTRACT Introduction The aim of this study was to assess the wear resistance of four bulk-fill composite resin restorative materials cured using high- and low-intensity lights. Materials and methods Twenty-four samples were prepared from each composite resin material (Tetric N-Ceram, SonicFill, Smart Dentin Replacement, Filtek Bulk-Fill) resulting in a total of 96 samples; they were placed into a mold in a single increment. All of the 96 samples were cured using the Bluephase N light curing unit for 20 seconds. Half of the total specimens (n = 48) were light cured using high-intensity output (1,200 mW/cm2), while the remaining half (n = 48) were light cured using low-intensity output (650 mW/cm2). Wear was analyzed by a three-dimensional (3D) noncontact optical profilometer (Contour GT-I, Bruker, Germany). Mean and standard deviation (SD) of surface loss (depth) after 120,000 cycles for each test material was calculated and analyzed using one-way analysis of variance (ANOVA) with a significance level at p < 0.05. Results The least mean surface loss was observed for SonicFill (186.52 µm) cured using low-intensity light. No significant difference in the mean surface loss was observed when comparing the four tested materials with each other without taking the curing light intensity into consideration (p = 0.352). A significant difference in the mean surface loss was observed between SonicFill cured using high-intensity light compared with that cured using low-intensity light (p < 0.001). Conclusion A higher curing light intensity (1,200 mW/cm2) had no positive influence on the wear resistance of the four bulk-fill composite resin restorative materials tested compared with lower curing light intensity (650 mW/cm2). Furthermore, SonicFill cured using low-intensity light was the most wearresistant material tested, whereas Tetric N-Ceram cured using high-intensity light was the least wear resistant. Clinical significance The wear resistance was better with the newly introduced bulk-fill composite resins under low-intensity light curing. How to cite this article Alkhudhairy F. Wear Resistance of Bulk-fill Composite Resin Restorative Materials Polymerized under different Curing Intensities. J Contemp Dent Pract 2017;18(1):39-43.


2007 ◽  
Vol 32 (6) ◽  
pp. 571-578 ◽  
Author(s):  
K. M. Rode ◽  
Y. Kawano ◽  
M. L. Turbino

Clinical Relevance Different light curing units, the thickness of the resin composite increments and the exposure distance to a curing light may change the physical properties of a restorative material and compromise its mechanical behavior under clinical loading conditions. Understanding how these factors can affect the quality of restorative products may help the dental professional in selecting the best activating source for a specific clinical application.


10.2341/08-38 ◽  
2009 ◽  
Vol 34 (1) ◽  
pp. 65-71 ◽  
Author(s):  
E. Mobarak ◽  
I. Elsayad ◽  
M. Ibrahim ◽  
W. El-Badrawy

Clinical Relevance The use of high intensity LED curing units will result in the polymerization of tooth-colored restoratives using shorter times.


2011 ◽  
Vol 38 (S 01) ◽  
Author(s):  
G Cardoso ◽  
C Pacheco ◽  
J Caldas-de-Almeida

2020 ◽  
Author(s):  
RQ Ramos ◽  
RR Moraes ◽  
GC Lopes

Clinical Relevance The use of multipeak LED light-curing guarantees efficiency on light activation of Ivocerin-containing light-cured resin cement.


2005 ◽  
Vol 156 (12) ◽  
pp. 481-486 ◽  
Author(s):  
Jurij Diaci ◽  
Lahorka Kozjek

The objective of our research was to examine the effect of canopy shading on beech sapling architecture in the oldgrowth silver fir-beech forests of Pecka and Rajhenavski Rog. In August 2003 we sampled one plot (352 m2) in a large gap in Pecka, which was a result of a strong windstorm in 1983, and eight small gaps (26–78 m2) with similar sapling heights (3.8–8 m). A ground view of each gap was drawn including the characteristics of gap border trees and the density of separate sapling layers was recorded. The height and diameter were measured for each sapling, as well as the following quality characteristics on selected dominant saplings: width of the crown,number of larger branches and knots (&gt;1/3 DBH), intensity of stem bending, deviation from vertical growth, number of terminal shoots, and the type of damage. The results show a negative effect of high canopy shading (estimated relative light intensity was below 5%) on the architectural quality of saplings. A lower overall density of saplings, greater intensity of bending and deviation from vertical growth, a shorter stem length without branches, a larger number of saplings with two terminal shoots, and a larger number of damaged saplings were observed in small gaps.


2020 ◽  
Vol 30 (Supplement_5) ◽  
Author(s):  
S Rubinelli

Abstract The paternalistic approach to health professional-patient communication is often no longer successful. The main reasons for this include the fact that trust in medicine and health professionals is no longer taken for granted. In many domains, the concepts of 'expert' and 'science' are in shadow. Moreover, patients can access all sorts of health information, including information that is or seems inconsistent with the advice given by their health professionals. This talk aims to illustrate some basic approaches to communication that can enhance health professional-patient interaction. First, health professionals should consider their communication with patients as a form of persuasion. Persuasion, that does not equal manipulation, is a way to communicate that takes into consideration the knowledge, beliefs, and attitudes of interlocutors. By adopting a person-centered style, health professionals should present their advice by contextualizing it into the emotional and cognitive setting of the patients. Second, communication should consider the lived experience of patients, that is the impact that a health condition or a preventive behavior has on their quality of life and their experience of pleasure. Indeed, managing health conditions is not just applying health advice: it often demands a change in lifestyles that can negatively impact how patients live their lives. Third, health professionals should develop clear strategies to engage with information that patients find from other sources. Health professionals must ask patients if they disagree with them, and to clarify any eventual difference of opinion. The information age has positively favored a democratization of health information. Yet, it imposes that health systems care for their communication. This talk concludes by presenting main evidence from on how to reinforce hospitals, public health institutions, and health services in communication so that patients want to listen.


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