Description

JOSOI Double-Curved-Line Shadowless LED Four-Spray High-Speed Handpiece

• Brand: JOSOI — professional high-speed dental handpiece for routine clinical procedures
• Shadowless LED illumination for clearer visibility around the bur tip
• Four-point water spray cooling system for balanced cooling and debris removal
• Double-curved-line exterior design for a smooth, professional appearance
• Metal body structure for durability and repeated sterilization cycles
• Push-button bur release for quick and convenient bur replacement
• Available with 2-hole and 4-hole connection interfaces
• 320,000–350,000 RPM high-speed turbine performance
• Low operating noise level of ≤60 dB
• Compatible with Φ1.595–1.600 mm standard dental burs
• Supports 135°C high-temperature autoclave sterilization

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Description

The JOSOI Double-Curved-Line Shadowless LED Four-Spray High-Speed Handpiece is designed for dental professionals who require reliable high-speed cutting performance, clear operative visibility, and efficient cooling during daily clinical procedures.

This model features a double-curved-line exterior design, integrated shadowless LED illumination, a four-point water spray cooling system, and a durable metal body. The smooth curved body provides a clean and professional appearance, while the LED light helps improve visibility around the bur tip during cavity preparation, crown reduction, margin refinement, and restorative adjustment.

The four-point water spray system directs cooling water toward the cutting area from multiple angles. This helps reduce heat buildup during high-speed operation and improves debris removal around the bur and tooth surface. With a working air pressure of 0.22–0.25 MPa and a speed range of 320,000–350,000 RPM, the handpiece provides efficient turbine performance for routine dental treatment.

The push-button bur release system allows quick bur replacement without additional tools, while the 2-hole / 4-hole interface options support compatibility with common dental unit connections. Product specifications are based on the uploaded product document.

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Feature

• The shadowless LED illumination system provides direct light near the bur tip, helping clinicians maintain better visibility during high-speed cutting and reducing the influence of shadows from tooth structure, handpiece angle, or external lighting limitations.
• The four-point water spray cooling system delivers water from multiple directions around the bur, supporting more balanced cooling performance than single-point spray designs.
• The multi-directional spray pattern helps reduce heat buildup during cutting, protect tooth structure, and wash away debris from the operative field.
• The double-curved-line exterior design gives the handpiece a smooth, modern appearance while supporting comfortable handling during routine dental procedures.
• The metal body provides structural strength, durability, and resistance to repeated cleaning and sterilization cycles.
• The push-button bur release system allows fast bur changes without requiring additional tools, helping improve chairside workflow and reduce treatment interruption.
• The 2-hole and 4-hole connection options allow the handpiece to be used with common dental unit interfaces.
• The low noise level of ≤60 dB helps create a more comfortable treatment environment for both patients and dental professionals.

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JOSOI Double-Curved-Line Shadowless LED Four-Spray High-Speed Handpiece — Specifications

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Working Principle

The JOSOI Double-Curved-Line Shadowless LED Four-Spray High-Speed Handpiece operates through a pneumatic turbine system. Compressed air enters the handpiece through the 2-hole or 4-hole connection interface and drives the internal turbine rotor. Under the recommended working air pressure of 0.22–0.25 MPa, the turbine reaches a rotational speed of 320,000–350,000 RPM.

The dental bur is held securely by the push-button chuck mechanism. Once the turbine begins rotating, the bur performs high-speed cutting, preparation, or adjustment on tooth structure and restorative materials. The push-button system allows the bur to be removed and replaced quickly after the turbine has fully stopped.

The LED illumination system provides direct light toward the operative field, helping improve visibility around the bur tip. This supports clearer observation during angled preparation, margin finishing, and procedures performed in areas where external dental light may be partially blocked.

At the same time, the four-point water spray system delivers cooling water from multiple outlets around the head. This helps cool the bur and tooth surface, reduce thermal buildup, and flush away cutting debris. The combination of high-speed turbine rotation, shadowless LED illumination, and four-point spray cooling supports efficient, controlled, and safer clinical operation.

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Clinical Practice of the JOSOI Double-Curved-Line Shadowless LED Four-Spray High-Speed Handpiece

1. Pre-Operative Setup

• Inspect the handpiece body, head, LED light area, spray outlets, and connection interface before use.
• Confirm that the selected dental bur has a shank diameter of Φ1.595–1.600 mm.
• Insert the bur fully into the chuck and confirm secure bur retention before operation.
• Connect the handpiece to the appropriate 2-hole or 4-hole dental unit interface.
• Confirm that the working air pressure is within the recommended range of 0.22–0.25 MPa.
• Run the handpiece unloaded for several seconds before intraoral use to check turbine rotation, LED illumination, four-point water spray output, and operating sound.

2. Intraoperative Management

• Use the LED illumination to improve visibility during cavity preparation, crown reduction, restorative adjustment, margin refinement, and other high-speed procedures.
• Maintain light and controlled cutting pressure. Excessive pressure may reduce turbine speed, increase heat generation, and shorten the service life of the bearings.
• Keep the four-point water spray active during cutting to reduce thermal buildup and improve debris clearance.
• Adjust the handpiece angle as needed while using the LED light to maintain clear observation of the operative field.
• Monitor the operating sound during use. Normal operation should remain at or below 60 dB.
• Stop operation immediately if abnormal vibration, unstable bur rotation, reduced water spray, or unusual noise occurs.
• Replace the bur only after the turbine has fully stopped.

3. Post-Operative Maintenance

• Remove the bur after the procedure using the push-button release.
• Flush the handpiece air and water lines after use to remove residual water, debris, and contaminants.
• Clean the external surface of the handpiece, especially around the head, LED area, four spray outlets, and connection interface.
• Check the spray outlets regularly to prevent blockage and maintain balanced cooling performance.
• Lubricate the handpiece according to the manufacturer’s maintenance protocol before sterilization.
• Sterilize the handpiece using 135°C high-temperature autoclave sterilization.
• After sterilization, allow the handpiece to dry completely before storage or reuse.

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The Function of the JOSOI Double-Curved-Line Shadowless LED Four-Spray High-Speed Handpiece

The JOSOI Double-Curved-Line Shadowless LED Four-Spray High-Speed Handpiece is used for high-speed dental cutting in routine clinical procedures. Its main function is to drive standard dental burs at 320,000–350,000 RPM for cavity preparation, crown preparation, restorative adjustment, occlusal reduction, and other procedures requiring efficient removal of tooth structure or restorative material.

The shadowless LED illumination improves the clinician’s ability to see the treatment area clearly. By providing light near the bur tip, it helps reduce visual obstruction caused by handpiece angle, tooth structure, and limited intraoral space.

The four-point water spray cooling system is designed to improve temperature control during high-speed operation. During cutting, friction can quickly generate heat. The multi-point spray helps cool the bur and tooth surface while flushing away debris, supporting safer and cleaner clinical operation.

The double-curved-line exterior design gives the handpiece a smooth and professional appearance, while the metal body provides durability for repeated daily use. Combined with the push-button bur release and common 2-hole / 4-hole interface options, this handpiece supports efficient chairside workflow in modern dental clinics.

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Important Notes for Using the JOSOI Double-Curved-Line Shadowless LED Four-Spray High-Speed Handpiece

1. Always confirm that the working air pressure is within 0.22–0.25 MPa before operation.
2. Use only burs with a shank diameter of Φ1.595–1.600 mm.
3. Do not operate the handpiece without a bur properly installed.
4. Always keep water spray active during cutting to prevent excessive heat buildup.
5. Check the four water spray outlets regularly. Blocked outlets may reduce cooling efficiency and affect cutting safety.
6. Do not press the push-button bur release while the turbine is still rotating.
7. Inspect the LED light before use. If the light is weak, unstable, or not working, check the handpiece before clinical operation.
8. Clean the head area, LED area, and spray outlets carefully after each use.
9. Lubricate the handpiece according to the recommended maintenance procedure before sterilization.
10. Sterilize the handpiece at 135°C using high-temperature autoclave sterilization.
11. After sterilization, inspect the handpiece for abnormal noise, vibration, reduced spray output, LED failure, or visible damage before returning it to clinical use.