1:4.2 Electric Dental Handpieces A Complete Guide

The world’s first 45-degree contra-angle, Ti-Max Z45L provides effortless access to hard-to-reach molars that a standard contra-angle simply can’t match.

Gear Ratio	1:4.2	Power Source	Turbine
Light	Fiber optic	Water pressure	0.2Mpa
Max Speed	200000rpm	type	push button with hex wrench
Chuck type	Push button	Bearings	ceramic bearing
Bur applicable	Φ(1.60/20-25) mm	Warranty	1 Year
Order Code	G-C4/C5	Water spray	Internal & external irrigation
Noise	≤65dB	Place of Origin	Guangdong, China

Technology & Function：

1：45° Head

The 45-degree angled head allows easy access to the molar region, minimizing interference from the front teeth and adjacent teeth.

2 ：Way Spray Function

The world’s first two-way spray function allows you to instantly choose a mist or jet spray depending on the conditions and procedure with an enclosed dedicated tool. The water jet spray prevents subcutaneous emphysema in surgical procedures, and the mist Water Jet Mist spray effectively cools the bur while cutting.

3：Versatile

Ti-Max Z45L is versatile, handling a wide range of burs from 20mm standard bur to 25mm long bur depending on what the procedure requires.

4:Titanium Body

Titanium body*. Light and very strong pure titanium is used for the body. The light handpiece reduces the burden on the hands during operations, and its enhanced hardness also improves its ability for autoclave sterilization. The biocompatible properties of titanium eliminate concern over allergies to metals.*Titanium is used only for the exterior parts, and not for the interior.

5:DURAGRIP

An ergonomic body shape and the introduction of new DURAGRIP coating provide superior grip and handling comfort.

6:Microfilter

Microfilter to prevent particles from entering the water spray system to guarantee optimum water spray cooling at all times.

1:4.2 Surgical Increasing Handpieces

The Precision Tool for Impacted Third Molar Extractions

When it comes to complex extractions and oral surgery, the choice of handpiece can define the surgical outcome. The 1:4.2 surgical increasing handpiece has emerged as the specialized standard for clinicians who demand more visibility and safety than a standard 1:5 handpiece can provide.

In this technical guide, we explore why the 1:4.2 ratio is the "sweet spot" for surgical precision and how it optimizes the workflow for impacted tooth sectioning.

Why choose 1:4.2 electric dental handpiece?

1;The Specialized Geometry of Oral Surgery:

While 1:5 handpieces are great for restorative work, the 1:4.2 ratio is often engineered with a specific 45° angle head. This isn't just an aesthetic choice—it’s about access.

2:Superior Access in the Posterior Region:

The 45° tilt allows surgeons to reach impacted third molars in the mandible and maxilla without the patient having to over-extend their jaw. This ergonomics improvement reduces patient discomfort and surgeon fatigue.

3:Optimized Torque for Bone Cutting:

With an electric motor at 40,000 rpm, the 1:4.2 attachment delivers approximately 168,000 rpm. This specific speed-to-torque balance is ideal for sectioning teeth and removing alveolar bone without the "skipping" effect seen in lower-quality attachments.

4. The Anti-Air Emphysema Feature:

One of the biggest risks in oral surgery using air-driven high-speeds is subcutaneous emphysema (air trapped under the skin).

Professional-grade 1:4.2 surgical handpieces solve this through:

Rear Exhaust Systems: Directing exhaust air away from the surgical site.

Pure Water Jet: Using a water jet instead of an air-water mist to cool the bur, ensuring no air is forced into the surgical wound or bone marrow.

Critical Features for the Modern Surgeon

If you are evaluating a 1:4.2 handpiece for your clinic or inventory, look for these professional specifications

Feature	Importance
45° Hand Angle	Maximum visibility and access to the 8th tooth (wisdom teeth)
DLC Coating	Scratch-resistant and provides a better grip when gloves are wet with saline
Titanium Body	High strength-to-weight ratio for precise tactile feedback
Clean Head System	Prevents oral fluids and contaminants from entering the handpiece head

1. Clinical Efficiency: Cutting Time in Half

For a dental practice, time is the most valuable asset. The 1:4.2 increasing handpiece allows for:

(1)●:Faster Sectioning: Powerful enough to slice through enamel and roots in seconds.

(2)●:Cleaner Visibility: Many models feature Cellular Glass Optics, providing shadowless illumination directly on the cutting path.

(3)●:Reduced Post-Op Complications: Smoother cuts lead to faster healing and less trauma to the surrounding tissue.

2. Maintenance for Longevity:

Surgical environments are harsh. Saline solution can be highly corrosive to internal gears.

(1)● Immediate Rinsing: Always rinse the external and internal spray lines with distilled water immediately after surgery to prevent salt crystal buildup.

(2)● Premium Lubrication: Use high-viscosity synthetic oils designed for high-load gears.

(3)● Conclusion: Precision Beyond the Standard

The 1:4.2 surgical handpiece is more than just a tool; it is a specialist's instrument. By offering the perfect blend of access, safety, and power, it remains the top choice for surgical extractions.

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