24V Corded Dental Light-Curing Unit: A Revolutionary Device for Precise Curing and Clinical Applications

I. Equipment Overview and Technical Positioning

The 24V corded dental light-curing unit is a specialized piece of equipment in the field of dental restoration, designed around the core principle of low-voltage power supply. Powered by a 24V DC current, it drives a high-power LED light source, enabling precise curing of dental composite resin materials. Compared to wireless models, the corded design eliminates the limitations of battery life, ensuring stable, long-term continuous operation—making it particularly well-suited for high-intensity clinical scenarios, such as full-arch denture restorations or multi-tooth fillings that require sustained light exposure.

This device is technically designed with a focus on **stability** and **controllability**. The 24V voltage not only ensures efficient power conversion but also eliminates the safety risks associated with high-voltage circuits, perfectly meeting the stringent safety requirements of dental treatments. Additionally, the wired connection eliminates the issue of light intensity fluctuations caused by battery degradation in wireless devices, guaranteeing consistent energy output throughout the curing process.

II. Core Structure and Operating Principle

1. Modular Structural Design

A 24V wired light-curing machine typically consists of three core modules:

- **LED Light Source Module**: Features a single-lamp or multi-lamp array design, with a wavelength range precisely covering 420–480 nm, perfectly matching the absorption peak of photoinitiators in dental resins.

- **Power Management Module**: Features a built-in 24V DC power adapter that supports a wide voltage input range of 100–240V, making it compatible with global power grid standards. The adapter incorporates EMC filtering technology to minimize electromagnetic interference, ensuring seamless compatibility with other electronic devices in the dental comprehensive treatment unit.

- **Light Guiding and Control System**: Equipped with a rotatable light guide rod (providing 360° all-around illumination) and an intelligent control panel, this system supports features such as adjustable timing settings (5–40 seconds) and mode switching (Full Power/Pulse/Gradual/AI).

2. Photocuring Principle and Advantages

The device emits high-intensity blue light via LEDs, which activates the photoinitiator in the resin to generate free radicals, triggering the polymerization reaction. Its technological advantages are evident in:

- **Cold Light Curing**: LEDs generate only 1/5 the heat of halogen lamps, and after 4 minutes of operation, the surface temperature of the light guide rod rises by no more than 8°C, effectively preventing thermal damage to the pulp.

III. Clinical Application Scenarios and Operational Guidelines

1. Typical Application Scenarios

- **Composite Resin Filling**: When restoring Class II cavities in posterior teeth, the 24V corded unit allows continuous curing across multiple tooth positions without needing to pause for battery changes.

- **Orthodontic Bracket Bonding**: The pulse mode (1-second on/4-second off) reduces resin polymerization shrinkage, thereby lowering the bracket detachment rate. Clinical studies show that this mode boosts bracket bond strength by 22%.

- **Pit and Fissure Sealing**: The gradual mode is suitable for pediatric patients, helping to reduce discomfort caused by sudden exposure to strong light.

2. Standardized Operating Procedures

1. **Equipment Preparation**: Ensure the power cord is securely connected and the end of the light guide is free of any dirt or stains. Turn on the device and allow it to preheat for 1 minute, making sure the light intensity remains stable.

2. **Parameter Settings**: Select the mode according to the resin type (e.g., pulse mode for flowable resins, full-power mode for high-viscosity resins), and set the duration (typically 10–20 seconds).

3. **Irradiation Procedure**: Position the tip of the light guide 2 mm away from the material surface, ensuring perpendicular irradiation. Treat each tooth area separately to avoid any omissions.

4. **Cooling Process**: After continuous irradiation for more than 30 seconds, pause for 2 seconds and cool with compressed air to prevent overheating and deformation of the material.