Related Experiment Video
Updated: Mar 15, 2026
16:30
Application of Light-cured Dental Adhesive Resin for Mounting Electrodes or Microdialysis Probes in Chronic Experiments
Published on: July 30, 2007
15.9K
Temperature Rise Induced by Light Curing Unit Can Shorten Enamel Acid-Etching Time
Ahmad Najafi Abrandabadi1, Seyedeh Mahsa Sheikh-Al-Eslamian2, Narges Panahandeh2
1Faculty Member, Department of Restorative Dentistry, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
Journal of Dentistry (Tehran, Iran)
|August 26, 2016
Summary
Reducing enamel etching time to five seconds with simultaneous light emitting diode (LED) irradiation is effective. This method maintains micro shear bond strength (μSBS) comparable to longer etching times, optimizing dental procedures.
Area of Science:
- Dental Materials Science
- Biomaterials Engineering
- Adhesive Dentistry
Background:
- Enamel etching is crucial for composite resin adhesion.
- Traditional etching times can be lengthy.
- Light curing units (LCUs) are standard in dental practice.
Purpose of the Study:
- To evaluate the thermal effect of LED LCUs on enamel etching.
- To determine if reduced etching time impacts bond strength.
- To assess the feasibility of simultaneous etching and light curing.
Main Methods:
- Three groups (n=15) were tested: 15s etching, 5s etching, and 5s etching with simultaneous LED irradiation.
- Micro shear bond strength (μSBS) of composite resin to enamel was measured.
- Statistical analysis was performed to compare bond strengths between groups.
Main Results:
- Mean μSBS values were 51.28±2.35 MPa (15s), 40.47±2.75 MPa (5s), and 50.00±2.59 MPa (5s + LED).
- Significant differences were found between 15s and 5s etching (P=0.013) and between 5s and 5s + LED (P=0.032).
- No significant difference in μSBS was observed between 15s etching and 5s etching with simultaneous LED irradiation (P=0.932).
Conclusions:
- Simultaneous LED light curing during enamel etching can reduce etching time to five seconds.
- This accelerated method achieves micro shear bond strength comparable to conventional 15-second etching.
- The findings suggest a potential optimization for chairside adhesive procedures.
Related Concept Videos
01:25Accelerated Curing of Concrete
541
Accelerating concrete curing is achieved by applying heat and additional moisture. This process accelerates the hydration of the cement, resulting in an earlier strength gain in the concrete. Steam curing is a method wherein the concrete products are either transported through a chamber on a conveyor belt or encased in plastic, allowing steam at atmospheric pressure to circulate freely around them. This process begins with a phase of moist curing that typically lasts between 3 to 5 hours, after...
541
01:20Hot Weather Concreting
346
Concreting at elevated temperatures accelerates the hydration process, leading to quicker setting but potentially reducing the long-term strength of the concrete structure. Additionally, low air humidity fosters rapid moisture loss from the concrete, resulting in reduced workability, pronounced plastic shrinkage, and a higher likelihood of crazing.
Mitigating the heat increase in concrete can be economically achieved by shading aggregate stockpiles to prevent heating from solar radiation,...
Mitigating the heat increase in concrete can be economically achieved by shading aggregate stockpiles to prevent heating from solar radiation,...
346
01:20Curing of Concrete
431
The hydration of cement takes place within the water-filled capillary pores. However, environmental elements can disrupt this process by evaporating water from the concrete surfaces. Sealed concrete with a water-cement ratio below 0.5 experiences self-desiccation, leading to water loss. The water loss in concrete is mitigated by curing. This technique involves keeping the concrete saturated to maintain the necessary temperature and moisture conditions, to optimally fill the spaces in the cement...
431
01:29Strength and Heat of Hydration
820
The hydration of cement is an exothermic reaction in which heat is generated as cement hydrates. This heat of hydration is critical to cement's strength development. The rate at which this heat is generated affects the temperature rise, with a majority of the heat being released early in the hydration process, half within the first three days, and about 75% within the first week.
The heat of hydration for each cement compound is significant; for instance, tricalcium aluminate (C3A) and...
The heat of hydration for each cement compound is significant; for instance, tricalcium aluminate (C3A) and...
820
01:26Curing Methods
357
Concrete members with a small surface-to-volume ratio are cured by oiling and moistening the forms before casting the concrete member. These forms can be left in place for a prolonged period to prevent moisture loss, and can be wetted if made of a material suitable for wetting. If the forms are removed early, the concrete member is moistened and covered with polythene sheets to maintain moisture. For large horizontal concrete surfaces exposed to dry weather, a temporary covering is suspended...
357
01:12Setting Time of Cement
867
The setting time of cement refers to the process of cement paste transitioning from a plastic state to a solid state. This process is crucial in construction as it dictates the timeframe for concrete placement, compaction, and finishing. The onset of this solidification is termed the initial set, indicating when the paste becomes unworkable. The final set is when the paste has solidified completely, and further handling or manipulation can no longer affect its shape. The cement strength is...
867