scholarly journals Penetration capability of three different light curing units to composite-resin as measured by radiometer

2018 ◽  
Vol 30 (2) ◽  
pp. 130
Author(s):  
Henri Hartman
Keyword(s):  
Light Source ◽  
Composite Resin ◽  
Daily Basis ◽  
Dental Practice ◽  
Restorative Material ◽  
Light Penetration ◽  
Output Intensity ◽  
Light Curing ◽  
Pass Through ◽  
Aesthetic Consideration

Introduction: Composite-resin is widely used as a restorative material in dental practice on a daily basis when it comes to an aesthetic consideration. The purpose of this study is to investigate and compare the light penetration capabilities of three light curing units (LCU) through layers of composite resin using a radiometer.  Method: Composites resin discs (2mm thick with 8 mm diameter) were cured out of seven different shades. Each specimen were used as a barrier, and a light source from three different LCUS was then applied through it. The radiometer was used to record the intensities of each LCU. Result: LED.C (Woodpecker™) has the lowest penetration capabilities to pass through the barrier compared to all LCU. The output intensity (mW/cm2) of all LCU has decreased gradually. ANOVA test showed that there was the significant result (p<0.01) for each specimen. Conclusion: The differences composite-resin shade could decrease the penetration capability of LCU.

The Influence of Tip Geometry and Distance on Light-curing Efficacy

10.2341/07-94 ◽  
2008 ◽  
Vol 33 (3) ◽  
pp. 325-331 ◽  
Author(s):  
G. Corciolani ◽  
A. Vichi ◽  
C. L. Davidson ◽  
M. Ferrari
Keyword(s):  
Light Source ◽  
Clinical Relevance ◽  
Resin Composite ◽  
Restorative Material ◽  
Entry And Exit ◽  
Depth Of Cure ◽  
Composite Restorations ◽  
Light Curing

Clinical Relevance Among the factors that significantly influence the depth of cure of resin composite restorations—the distance between the tip of the light source and the restorative material—as well as the geometry of the tip, are crucial parameters. Increasing the ratio between the entry and exit diameter of the tip will result in an improvement in the depth of cure for lower distances between the tip of the light source and the restorative material, while decreasing the ratio of the depth of cure, which will be higher for greater distances.

scholarly journals Influence of light source and immersion media in surface roughness and hardness of a nanofilled composite resin

2013 ◽  
Vol 1 (2) ◽  
pp. 165
Author(s):  
Patrícia Aleixo dos Santos Domingos ◽  
Patrícia Petromilli Nordi Sasso Garcia ◽  
Ana Luisa Botta Martins Oliveira ◽  
Juliana Álvares Duarte Bonini Campos ◽  
Regina Guenka Palma Dibb
Keyword(s):  
Surface Roughness ◽  
Light Source ◽  
Vickers Hardness ◽  
Statistical Difference ◽  
Composite Resin ◽  
Artificial Saliva ◽  
Anova Test ◽  
Significant Statistical Difference ◽  
Light Curing ◽  
Respective Solution

The study evaluated the influence of light curing units and immersion media on superficial roughness and microhardness of the nanofilled composite resin Supreme XT (3M/ESPE). Light curing units used were: XL 3000 (3M/ESPE), Jet Lite 4000 Plus (JMorita) and Ultralume Led 5 (Ultradent) and immersion media were artificial saliva, Coke®, tea and coffee, totaling 12 experimental groups. Specimens (10mm x 2mm) were immersed in each respective solution for 5 seconds, three times a day, during 60 days and so, were submitted to measure of superficial roughness (Ra) and Vickers hardness. Data were subjected to two-way ANOVA test (p<0.05). Results showed that only the light source factor showed statistically difference for hardness. It was observed that the hardness of the composite resin Filtek Supreme XT (3M/ESPE) was influenced by the light source (p<0.01) independently of the immersion media (p= 0.35) and the Jet Lite 4000 Plus (JMorita) was the light curing unit that presented lower values. In relation to surface roughness, it was noted no-significant statistical difference for light source (p=0.84), when specimens were immersed in different beverages (p=0.35).

scholarly journals Compressive strength of esthetic restorative materials polymerized with quartz-tungsten-halogen light and blue LED

2009 ◽  
Vol 20 (1) ◽  
pp. 54-57 ◽  
Author(s):  
Cecy Martins Silva ◽  
Katia Regina Hostilio Cervantes Dias
Keyword(s):  
Compressive Strength ◽  
Light Source ◽  
Composite Resin ◽  
Light Emitting Diode ◽  
Testing Machine ◽  
Quartz Tungsten Halogen ◽  
Halogen Light ◽  
Significant Difference ◽  
Restorative Materials ◽  
Light Curing

This study compared the compressive strength of a composite resin and compomer photoactivated with a conventional quartz-tungsten halogen-light (XL 3000, 3M/SPE) and a blue light-emitting diode (LED) (SmartLite PS; Dentsply/De Trey). Forty disc-shaped specimens were prepared using a split polytetrafluoroethylene matrix (4.0 mm diameter x 8.0 mm hight) in which the materials were inserted incrementally. The curing time of each increment was of 40 s with the QTH and 10 s with the LED. The specimens were randomly assigned to 4 groups (n=10), according to the light source and the restorative material. After storage in distilled water at 37oC ± 2oC for 24 h, the specimens was tested in compressive strength in a universal testing machine with load cell of 500 kgf running at a crosshead speed of 0.5 mm/min. Data (in MPa) were analyzed statistically by ANOVA and Student-Newman-Keuls test (p<0.05). For the composite resin, light curing with the QTH source did not produce statistically significant difference (p>0.05) in the compressive strength when compared to light curing with the LED source. However, light curing of the compomer with the QTH source resulted in significantly higher compressive strength than the use of the LED unit (p>0.05). The composite resin presented significantly higher (p>0.05) compressive strength than the compomer, regardless of the light source. In conclusion, the compressive strength of the tested materials photoactivated with a QTH and a LED light source was influenced by the energy density employed and the chemical composition of the esthetic restorative materials.

scholarly journals Microleakage of Nanofilled Composite Resin Restorative Material

2011 ◽  
Vol 02 (03) ◽  
pp. 329-334 ◽  
Author(s):  
Ibrahim Hamouda ◽  
Hagag abd Elkader ◽  
Manal F. Badawi
Keyword(s):  
Composite Resin ◽  
Restorative Material

scholarly journals THE COMPARISON OF RESIN-BASED COMPOSITES PHYSICAL PROPERTIES BETWEEN BULK-FILL TECHNIQUE AND INCREMENTAL TECHNIQUE

2021 ◽  
Vol 6 (1) ◽  
pp. 85
Author(s):  
Rahmi Khairani Aulia
Keyword(s):  
Physical Properties ◽  
Composite Resin ◽  
Color Stability ◽  
Composite Resins ◽  
Shrinkage Stress ◽  
Restorative Material ◽  
Polymerization Shrinkage ◽  
Advantages And Disadvantages ◽  
Restoration Technique ◽  
Restoration Failure

ABSTRACT:Composite resins are currently the most popular restorative material in dentistry. This is due to good aesthetics and maximum conservation ability. Behind these advantages, there are disbenefits of composite resin materials, such as polymerization shrinkage, which can lead to restoration failure. Various attempts have been investigated to reduce the shrinkage incidence of composite resins, one of which is the technique of placing the restorative material into the cavity. The restoration filling technique is recognized as a significant factor in shrinkage stress. By using a special filling technique, the polymerization shrinkage damage stress can be reduced. There are several techniques in performing composite resin fillings, including bulk and incremental techniques. These techniques have their respective advantages and disadvantages. The aim of this literature review was to compare the physical properties of composite resin restorations with bulk filling and incremental techniques. Physical properties that being studied include polymerization shrinkage, stress shrinkage, degree of conversion, bonding strength, water resorption, color stability, and temperature increase. Comparing the two techniques, composite resin with incremental filling technique has superior physical properties compared to bulk technique. From the comparison of the two techniques, the composite resin with incremental filling technique has superior physical properties compared to the bulk technique, especially in higher conversion which causes lower shrinkage stress. This situation makes the incremental technique provide better bond strength, water resorption, color stability, and lower temperature rise.Keywords: Bulk, Composite Resin, Incremental,  Physical Properties, Restoration, Restoration Technique

scholarly journals AN IN VITRO COMPARATIVE EVALUATION OF COMMERCIALLY AVAILABLE MOUTH RINSES (ALCOHOL CONTAINING AND ALCOHOL FREE) ON THE MICROHARDNESS OF A NANOFILLED COMPOSITE RESIN RESTORATIVE MATERIAL

2020 ◽  
Vol 8 (8) ◽  
pp. 420-428
Author(s):  
Santhosh P. Sagar ◽  
◽  
Sahadev Chickmagarvalli Krishnegowda ◽  
Praveen Kumar M.R ◽  
Bharath Makonahalli Jaganath ◽  
...  
Keyword(s):  
Comparative Evaluation ◽  
Composite Resin ◽  
Restorative Material ◽  
Mouth Rinses

Photoinitiators in Dentistry: A Review

2013 ◽  
Vol 2 (4) ◽  
pp. 30-33 ◽  
Author(s):  
Ario Santini ◽  
Iranzihuatl Torres Gallegos ◽  
Christopher M. Felix
Keyword(s):  
Light Transmission ◽  
Uv Light ◽  
Energy Levels ◽  
Polymer Network ◽  
Filling Material ◽  
Restorative Material ◽  
Spectral Emission ◽  
Potential Health ◽  
Posterior Teeth ◽  
Light Curing

Polymerization of Resin Based Composites (RBCs) initiated by a light curing unit activating photoinitiators. Different RBCs require different light energy levels for proper curing. Manufacturers are now producing RBCs with more than one initiator and not all of these will be properly polymerised with blue LED lights. An added problem is that manufacturers do not always indicate the type of photoinitiators in their materials. This review discusses the importance of matching the spectral output of LCUs to the absorption spectra of RBCs and the consequences of spectral mismatch. Resin based composites (RBCs) were first introduced in the 1960s1 and with development of effective and reliable dentine bonding systems2, have been used routinely as a filling material for both anterior and posterior teeth. The early RBCs were either chemically cured two component materials or photo-initiated materials that used UV initiators in the beginning and then transitioned to visible light initiators such as camphorquinine which was introduced in 1978.3 The first report of a light curing material was of an ultraviolet (UV) cured fissure sealant.4 However, due to the limited penetration depth of the UV light and the potential health hazards, this system was quickly abandoned. The advancement of science yielded light curing materials which contributed to a significant clinical progress over the UV and chemically cured RBCs.4 Additional advancements to direct RBC restoration materials included luting agents for ceramic restorations, pit and fissure sealants and resin modified glass ionomers. Polymerization in an RBC is initiated by a light curing unit (LCU); this technology is based on the use of photoreactive systems that absorb light irradiation from the LCUs at appropriate wavelength. Then the photoinitiators contained in the RBCs, absorb the incoming photons from the LCU and the monomers in the molecular structure become excited and in that active state, there is a change from monomers into a polymer network6. The success of this technology hinges on matching the spectral emission of the LCU with the requirements of the photoinitiator system to convert the monomers into a polymer network. The amount of activated photo initiator depends on the concentration of photoinitiator in the material, the number of photons to which the material is exposed and the energy of the photons (wavelength), the latter depending on the curing light.6 The most common photoinitiator in dental materials today is camphorquinone, which has a peak activity around 470 nanometres.6 The factors affecting polymerization include filler type, size and loading, the thickness and shade of the restorative material, the effectiveness of light transmission (eg. light guide tips being free from debris and scratches), exposure time, distance of the light source from the restorative material and light intensity.7 It is important to note that the photoinitiator activation occurs at specific wavelengths, in other words, the optimum efficiency is obtained when the peak absorptivity of the photoinitiator corresponds with the spectral emission from the LCU. Commercially available curing units have different light intensities and light sources, with energy levels in QTH, LED and other LCUs ranging from 300 to more than 2000 mW/cm.

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