Description

JOSOI Knurled Large-Head LED High-Speed Handpiece

• Brand: JOSOI — professional high-speed handpiece for clinical dental applications
• Large-head design for stable cutting performance and efficient tooth preparation
• Straight knurled grip pattern for improved anti-slip control during operation
• Integrated LED illumination for enhanced visibility at the bur tip
• Triple water spray cooling system for balanced cooling and effective debris removal
• Push-button bur release for fast and convenient bur replacement
• Available with 2-hole and 4-hole connection interfaces
• 320,000–350,000 RPM high-speed turbine performance
• Compatible with 135°C high-temperature autoclave sterilization

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Description

The JOSOI Knurled Large-Head LED High-Speed Handpiece is designed for dental professionals who require stable high-speed cutting performance, reliable cooling, enhanced visibility, and secure hand control during daily clinical procedures.

This model features a large-head turbine structure, straight knurled exterior pattern, integrated LED illumination, and a three-point water spray cooling system. The large-head design provides strong cutting stability, while the LED light improves visibility around the bur tip and preparation area. The straight knurled grip surface helps clinicians maintain secure handling even during long procedures or wet operating conditions.

With a working air pressure of 0.22–0.25 MPa and a rotational speed of 320,000–350,000 RPM, the handpiece delivers efficient cutting performance for restorative preparation, crown reduction, cavity preparation, and other routine dental procedures. Its metal body, push-button bur release, and compatibility with 135°C autoclave sterilization make it a practical and reliable option for modern dental clinics. Product specifications are based on the uploaded document.

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Feature

• The large-head design provides stable turbine operation and strong cutting efficiency, making the handpiece suitable for routine restorative and prosthodontic procedures where consistent cutting power is required.
• The straight knurled grip pattern improves handpiece control by increasing surface friction between the clinician’s fingers and the handpiece body. This is especially useful during procedures where water spray, gloves, or long operating time may reduce grip security.
• The integrated LED illumination provides direct light near the bur tip, helping clinicians maintain better visibility in the operative field and reducing dependence on external lighting alone.
• The three-point water spray cooling system delivers water from multiple directions around the bur, helping reduce heat generation during high-speed cutting and supporting effective removal of debris from the working area.
• The push-button bur release system allows fast, one-handed bur changes without the need for additional tools, improving clinical workflow and reducing chairside interruption.
• The 2-hole and 4-hole connection options provide compatibility with common dental unit interfaces, allowing flexible use in different clinic configurations.
• The metal body offers durability, structural stability, and resistance to repeated sterilization cycles.

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JOSOI Knurled Large-Head LED High-Speed Handpiece — Specifications

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Working Principle

The JOSOI Knurled Large-Head LED 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 at high speed. Under the recommended working air pressure of 0.22–0.25 MPa, the turbine reaches a rotational speed of 320,000–350,000 RPM.

During operation, the bur is held securely by the push-button chuck system. Once the turbine rotates, the bur performs high-speed cutting on tooth structure or restorative materials. The large-head design supports stable turbine movement and helps maintain cutting consistency during clinical use.

The LED illumination system provides light near the head area, improving visibility around the bur tip. At the same time, the three-point water spray system directs cooling water toward the cutting area from multiple angles. This helps reduce heat buildup, protect tooth structure, improve patient comfort, and clear debris from the operative field.

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Clinical Practice of the JOSOI Knurled Large-Head LED High-Speed Handpiece

1. Pre-Operative Setup

• Inspect the handpiece body, large head, LED light area, and connection interface before use.
• Confirm that the selected bur has a shank diameter of Φ1.595–1.600 mm.
• Insert the bur fully into the chuck and press the push-button mechanism to confirm secure bur engagement.
• 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 sound, LED illumination, water spray output, and bur rotation stability.

2. Intraoperative Management

• Use the LED illumination to support direct visibility during cavity preparation, crown reduction, occlusal adjustment, and other high-speed cutting procedures.
• Maintain light and controlled hand pressure. Excessive pressure may reduce turbine efficiency, increase heat generation, and shorten bearing life.
• Use continuous three-point water spray during cutting to reduce thermal damage and improve debris clearance.
• Hold the handpiece using the straight knurled grip area to maintain stable control, especially during angled preparation or longer procedures.
• Monitor the operating sound during use. Normal operation should remain at or below 60 dB. Any abnormal sound, vibration, or reduced cutting efficiency may indicate the need for inspection or maintenance.
• Replace burs only after the turbine has fully stopped.

3. Post-Operative Maintenance

• Remove the bur immediately after the procedure using the push-button release.
• Flush the water and air lines after use to remove residual water, debris, and contaminants.
• Clean the external surface of the handpiece, especially around the head, LED area, spray outlets, and knurled grip grooves.
• 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 Knurled Large-Head LED High-Speed Handpiece

The JOSOI Knurled Large-Head LED High-Speed Handpiece is used for efficient high-speed dental cutting in routine clinical procedures. Its main function is to drive dental burs at 320,000–350,000 RPM for fast tooth preparation, restorative adjustment, crown preparation, and other procedures requiring precise removal of hard tissue or restorative material.

The large-head structure provides strong and stable turbine performance, making it suitable for procedures that require consistent cutting power. The LED light improves visibility in the treatment area, helping clinicians identify preparation margins, tooth surfaces, and working angles more clearly.

The three-point water spray system plays an important role in temperature control. During high-speed cutting, friction can generate heat quickly. The multi-directional water spray helps cool the bur and tooth surface while also washing away debris. This supports safer, cleaner, and more efficient clinical operation.

The straight knurled grip design enhances manual control. Compared with a smooth-body handpiece, the knurled surface provides stronger anti-slip performance, helping clinicians maintain stable operation during wet or extended procedures.

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Important Notes for Using the JOSOI Knurled Large-Head LED High-Speed Handpiece

1. Always confirm that the working air pressure is within 0.22–0.25 MPa before use. Incorrect air pressure may affect speed, cutting performance, and turbine life.
2. Use only burs with a shank diameter of Φ1.595–1.600 mm. Incorrect bur size may cause poor chuck retention, vibration, or unsafe operation.
3. Do not operate the handpiece without a bur properly installed.
4. Always use water spray during cutting to reduce heat buildup and protect tooth structure.
5. Do not press the push-button bur release while the turbine is still rotating.
6. Clean the spray outlets regularly to prevent blockage and maintain proper three-point water cooling performance.
7. Inspect the LED light area before use. If light output becomes weak or unstable, the handpiece should be checked before clinical operation.
8. Lubricate the handpiece before sterilization according to the recommended maintenance procedure.
9. Sterilize the handpiece at 135°C using high-temperature autoclave sterilization.
10. After sterilization, check the handpiece for abnormal noise, vibration, reduced spray output, or visible damage before returning it to clinical use.