Effect of Preheating Resin Composite and Light-curing Units on the Microleakage of Class II Restorations Submitted to Thermocycling

2011 ◽  
Vol 36 (1) ◽  
pp. 60-65 ◽  
Author(s):  
R. E. Agostinho dos Santos ◽  
A. F. Lima ◽  
G. P. Soares ◽  
G. M. B. Ambrosano ◽  
G. M. Marchi ◽  
...  
Keyword(s):  
Clinical Relevance ◽  
Resin Composite ◽  
Class Ii ◽  
Light Irradiance ◽  
Quartz Tungsten Halogen ◽  
Halogen Light ◽  
Light Curing ◽  
Dispersion Of Light

Clinical Relevance Deficient polymerization can occur in deeper cavities due to the dispersion of light irradiance, and it may affect microleakage of the tooth-restoration interface. When using a quartz-tungsten-halogen light-curing unit with relatively low irradiance (420 mW/cm2) to restore a Class II restoration, microleakage can be reduced if the resin-composite is heated prior to use.

scholarly journals The Effect of Irradiation Distance on Microhardness of Resin Composites Cured with Different Light Curing Units

2010 ◽  
Vol 04 (04) ◽  
pp. 440-446 ◽  
Author(s):  
Isil Cekic-Nagas ◽  
Ferhan Egilmez ◽  
Gulfem Ergun
Keyword(s):  
Light Emitting Diode ◽  
Resin Composite ◽  
Composite Layer ◽  
Hardness Test ◽  
Resin Composites ◽  
Plasma Arc ◽  
Light Emitting ◽  
Quartz Tungsten Halogen ◽  
Halogen Light ◽  
Light Curing

Objectives: The aim of this study was to compare the microhardness of five different resin composites at different irradiation distances (2 mm and 9 mm) by using three light curing units (quartz tungsten halogen, light emitting diodes and plasma arc).Methods: A total of 210 disc-shaped samples (2 mm height and 6 mm diameter) were prepared from different resin composites (Simile, Aelite Aesthetic Enamel, Clearfil AP-X, Grandio caps and Filtek Z250). Photoactivation was performed by using quartz tungsten halogen, light emitting diode and plasma arc curing units at two irradiation distances (2 mm and 9 mm). Then the samples (n=7/ per group) were stored dry in dark at 37°C for 24 h. The Vickers hardness test was performed on the resin composite layer with a microhardness tester (Shimadzu HMV). Data were statistically analyzed using nonparametric Kruskal Wallis and Mann-Whitney U tests.Results: Statistical analysis revealed that the resin composite groups, the type of the light curing units and the irradiation distances have significant effects on the microhardness values (P<.05).Conclusions: Light curing unit and irradiation distance are important factors to be considered for obtaining adequate microhardness of different resin composite groups. (Eur J Dent 2010;4:440-446)

scholarly journals Comparison of Proximal Contacts of Class II Resin Composite Restorations In Vitro

2006 ◽  
Vol 31 (6) ◽  
pp. 688-693 ◽  
Author(s):  
B. A. C. Loomans ◽  
N. J. M. Opdam ◽  
F. J. M. Roeters ◽  
E. M. Bronkhorst ◽  
R. C. W. Burgersdijk
Keyword(s):  
Clinical Relevance ◽  
Resin Composite ◽  
Class Ii ◽  
Composite Restorations ◽  
Composite Restoration

Clinical Relevance When placing a Class II resin composite restoration, the use of sectional matrix systems and separation rings to obtain tight proximal contacts is recommended.

Gingival Microleakage of Class II Resin Composite Restorations with Fiber Inserts

10.2341/06-86 ◽  
2007 ◽  
Vol 32 (3) ◽  
pp. 298-305 ◽  
Author(s):  
O. El-Mowafy ◽  
W. El-Badrawy ◽  
A. Eltanty ◽  
K. Abbasi ◽  
N. Habib
Keyword(s):  
Clinical Relevance ◽  
Resin Composite ◽  
Class Ii ◽  
Composite Restorations ◽  
Fiber Inserts

Clinical Relevance Fiber inserts incorporated at the gingival floor of Class II composite restorations resulted in a significant reduction of microleakage scores as compared to restorations made without inserts. This may lead to a reduced incidence of recurrent caries.

Factors Associated with Microleakage in Class II Resin Composite Restorations

10.2341/06-16 ◽  
2007 ◽  
Vol 32 (1) ◽  
pp. 60-66 ◽  
Author(s):  
S. Idriss ◽  
T. Abduljabbar ◽  
C. Habib ◽  
R. Omar
Keyword(s):  
Clinical Outcomes ◽  
Clinical Relevance ◽  
Resin Composite ◽  
Class Ii ◽  
Gap Size ◽  
Marginal Gap ◽  
Factors Associated ◽  
Composite Restorations ◽  
Placement Technique

Clinical Relevance Even though marginal gap size was not shown to be a direct predictor for the extent of microleakage in resin composite restorations, both material and placement technique appear to be important determinants in microleakage and, thus, probably in clinical outcomes.

scholarly journals Effect of Light-Sources and Thicknesses of Composite Onlays on Micro-Hardness of Luting Composites

Materials ◽  
2021 ◽  
Vol 14 (22) ◽  
pp. 6849
Author(s):  
Francesco De Angelis ◽  
Mirco Vadini ◽  
Mario Capogreco ◽  
Camillo D’Arcangelo ◽  
Maurizio D’Amario
Keyword(s):  
High Power ◽  
Resin Composite ◽  
Composite Layer ◽  
Resin Cement ◽  
Specimen Thickness ◽  
Light Sources ◽  
Curing Time ◽  
Resin Cements ◽  
Halogen Light ◽  
Light Curing

The aim of this study was to compare three different light-curing-units (LCUs) and determine their effectiveness in the adhesive cementation of indirect composite restorations when a light-curing resin cement is used. Two resin composites were selected: Enamel Plus HRI (Micerium) and AURA (SDI). Three thicknesses (3 mm, 4 mm and 5 mm) were produced and applied as overlays and underlays for each resin composite. A standardized composite layer was placed between underlay and overlay surfaces. Light curing of the resin-based luting composites was attained through the overlay filters using LCUs for different exposure times. All specimens were allocated to experimental groups according to the overlay thickness, curing unit and curing time. Vickers Hardness (VH) notches were carried out on each specimen. Data were statistically evaluated. The curing unit, curing time and overlay thickness were significant factors capable of influencing VH values. The results showed significantly decreased VH values with increasing specimen thickness (p < 0.05). Significant differences in VH values were found amongst the LCUs for the various exposure times (p < 0.05). According to the results, a time of cure shorter than 80 s (with a conventional quartz–tungsten–halogen LCU) or shorter than 40 s (with a high-power light-emitting diode (LED) LCU) is not recommended. The only subgroup achieving clinically acceptable VH values after a short 20 s curing time included the 3 mm-thick overlays made out of the AURA composite, when the high-power LED LCU unit was used (VH 51.0). Composite thickness has an intense effect on polymerization. In clinical practice, light-cured resin cements may result in insufficient polymerization for high thickness and inadequate times. High-intensity curing lights can attain the sufficient polymerization of resin cements through overlays in a significantly shorter time than conventional halogen light.

scholarly journals Surface Hardness of Nanohybrid and Microhybrid Resin Composites Cured by Light Emitting Diode and Quartz Tungsten Halogen Light Curing Systems: An Invitro Study

2020 ◽  
Author(s):  
Anuradha Vitthal Wankhade ◽  
Sharad Basavraj Kamat ◽  
Santosh Irappa Hugar ◽  
Girish Shankar Nanjannawar ◽  
Sumit Balasaheb Vhate
Keyword(s):  
Light Emitting Diode ◽  
Surface Hardness ◽  
Composite Resins ◽  
Resin Composites ◽  
Light Emitting ◽  
Quartz Tungsten Halogen ◽  
Halogen Light ◽  
Intergroup Comparison ◽  
Light Curing ◽  
Curing Systems

Introduction: New generation composite resin materials have revolutionized the art of aesthetic dentistry. The clinical success is dependent on effective polymerisation and surface hardness which in turn are dependent on the performance of Light Curing Units (LCU). This study utilises surface hardness as a measure of degree of polymerisation of composite resins achieved by LCUs. Aim: To evaluate the difference in surface hardness of nanohybrid and microhybrid resin composites cured by light curing systems, Light Emitting Diode (LED) and Quartz Tungsten Halogen (QTH). Materials and Methods: In this invitro experimental study, two types of hybrid composites (Nanohybrid and Microhybrid) were tested for surface hardness by using two different light curing systems (LED and QTH). All the Nanohybrid and Microhybrid specimens were cured using LED and QTH LCUs, thus giving four combinations. A total of 60 specimens (6 mm diameter and 2 mm depth) were prepared using Teflon mould with 15 samples for each combination. Surface hardness was measured on upper and lower surface after 24 hours and hardness ratio was calculated. Data was analysed using independent t-test for intergroup comparison. Level of significance was kept at 5%. Results: Surface hardness of resin composites cured by LED LCU was greater than those cured by QTH LCU. Additionally, the hardness value was greater for the upper surface. Nanohybrids showed better surface hardness than Microhybrids for both the LCUs. Conclusion: Nanohybrid composite resins and LED system were found to be more effective in terms of surface hardness as compared to their counterparts.

Role of Additional Retention on Marginal Adaptation and Sealing of Large Resin Composite Class II Restorations

2007 ◽  
Vol 32 (6) ◽  
pp. 564-570 ◽  
Author(s):  
S. K. Ishikiriama ◽  
R. F. L. Mondelli ◽  
S. C. Kano ◽  
A. Ishikiriama ◽  
J. Mondelli
Keyword(s):  
Clinical Relevance ◽  
Resin Composite ◽  
Class Ii ◽  
Marginal Adaptation

Clinical Relevance Retention grooves in proximal box cavities can minimize microleakage and improve marginal adaptation of large resin composite Class II restorations.

Intensity of quartz-tungsten-halogen light-curing units used in private practice in Toronto

2005 ◽  
Vol 136 (6) ◽  
pp. 766-773 ◽  
Author(s):  
OMAR EL-MOWAFY ◽  
WAFA EL-BADRAWY ◽  
DONALD W. LEWIS ◽  
BABAK SHOKATI ◽  
JAFFER KERMALLI ◽  
...  
Keyword(s):  
Private Practice ◽  
Quartz Tungsten Halogen ◽  
Halogen Light ◽  
Light Curing

scholarly journals Water sorption of resin-modified glass-ionomer cements photoactivated with LED

2006 ◽  
Vol 20 (4) ◽  
pp. 342-346 ◽  
Author(s):  
Daniela Francisca Gigo Cefaly ◽  
Linda Wang ◽  
Liliam Lucia Carrara Paes de Mello ◽  
Janaína Lima dos Santos ◽  
Jean Rodrigo dos Santos ◽  
...  
Keyword(s):  
Water Sorption ◽  
Resin Composite ◽  
Composite Resins ◽  
Glass Ionomer Cements ◽  
Glass Ionomer ◽  
Constant Mass ◽  
Light Emitting ◽  
Halogen Light ◽  
Resin Modified Glass Ionomer ◽  
Light Curing

The Light Emitting Diodes (LED) technology has been used to photoactivate composite resins and there is a great number of published studies in this area. However, there are no studies regarding resin-modified glass-ionomer cements (RMGIC), which also need photoactivation. Therefore, the aim of this study was to evaluate water sorption of two RMGIC photoactivated with LED and to compare this property to that obtained with a halogen light curing unit. A resin composite was used as control. Five specimens of 15.0 mm in diameter x 1.0 mm in height were prepared for each combination of material (Fuji II LC Improved, Vitremer, and Filtek Z250) and curing unit (Radii and Optilight Plus) and transferred to desiccators until a constant mass was obtained. Then the specimens were immersed into deionized water for 7 days, weighed and reconditioned to a constant mass in desiccators. Water sorption was calculated based on weight and volume of specimens. The data were analyzed by two-way ANOVA and Tukey test (p < 0.05). Specimens photocured with LED presented significantly more water sorption than those photocured with halogen light. The RMGIC absorbed statistically significant more water than the resin composite. The type of light curing unit affected water sorption characteristics of the RMGIC.

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