Red ring contra-angle

How can you extend the lifespan of your red contra-angles? 

In a red contra-angle, the entire kinematic chain is made up of gears, from the entry of the contra-angle to its output (the bur). The red contra-angle increases the speed imparted by the micromotor, generally by a factor of 5 (one revolution in, five out). This means that a micromotor running at 40,000 rpm causes the bur of a red contra-angle to rotate at 200,000 rpm, i.e. more than 3,300 revolutions per second. That is absolutely colossal.

To put this into perspective, this means that in just one second, the bur rotates more than 3,300 times…

Regarding lubrication

Unlike a car engine, a contra-angle has no oil reservoir. It is therefore necessary to continuously provide the necessary lubrication in order to reduce metal-on-metal friction, and thus prevent overheating, tearing of material from ball bearings, gears, etc. — which signal the beginning of the end for the contra-angle.

If a film of grease does not coat the moving parts (gears / bearing balls), the materials will heat up and metal will be torn away. The bearings will develop play, as will the gears, and they will become noisy. The bur will no longer be held on its axis due to the play in the bearings. At this speed, this will cause vibrations and may even lead to the bearing exploding with the micro-balls scattering, or more commonly the breaking of gear teeth. That is it — the contra-angle is broken!

It is therefore very important to provide the necessary lubrication for the proper functioning of the equipment at every use — or in practice between each patient/sterilisation cycle — since there is no oil reservoir in the contra-angle.

We believe that for instruments rotating at very high speeds, spray-can lubrication is preferable to automated machine lubrication. At a minimum, before autoclave sterilisation, automated lubrication should be supplemented with a spray-can injection of lubricant. Lubrication should be applied through the base of the equipment until the lubricant comes out through the head of the instrument.

If the lubricant comes out dark or black in colour when ejected through the head, continue injecting until the product comes out clean and clear. This will clean out any surplus lubricant that has heated up during use. Once this is done, apply a little lubricant into the head through the bur insertion port. You will thus be assured of perfect lubrication.

The problem with automated lubricators is that they are perfect in theory, but in practice, if the lubricant is not distributed correctly throughout the entire kinematic chain, you will have a lubrication failure leading to rapid deterioration of the instrument.

Regarding the use of equipment

While lubrication is important, it only slows down the wear of equipment and materials. Since there is movement, there is friction, and therefore wear. In order to reduce this wear, we believe there are two key points to respect:

• Speed: the less rapidly the equipment rotates, the less quickly it will wear.
• The force applied: the less pressure you put on the bur, the less the gears will wear.

Obviously, equipment is made to be used, but for example, running a micromotor at 25,000–30,000 rpm rather than at its maximum speed will considerably extend the lifespan of the contra-angle.

Likewise, it is important to work with unworn burs. If the bur cuts well, you will be able to lower the motor speed and apply less force to cut. This can double the lifespan of the equipment. It should not be forgotten that a lower-quality bur, when new, will always be more effective than a worn premium brand bur.

Our advice: use inexpensive burs, but new or in perfect condition, rather than making expensive burs last when they are worn — which ultimately perform less well than low-cost burs.

What is a red ring contra-angle?

A red ring contra-angle is an essential rotary instrument in dentistry, bearing this name due to the red ring that surrounds it, which often indicates its high rotation speed. This tool, also known as a multiplying contra-angle, has become a key item in a dental surgeon's kit due to its versatility. It is primarily used for tasks requiring great precision, such as cavity preparation, careful cutting and precise finishing of dental restorations. Its role in modern dentistry is invaluable.

Red ring contra-angle: A multiplication ratio of up to 5

The red ring contra-angle takes its name from the distinctive red ring that surrounds it. It is an instrument designed for dental tasks requiring a high rotation speed relative to the micromotor, with a ratio of 1:4.2 or 1:5. This characteristic allows much higher rotation speeds to be achieved, making it a preferred choice for tasks such as precise cutting, meticulous finishing, scaling, and even polishing. The red ring contra-angle can be considered a powerful ally for the dental surgeon, offering unmatched precision and increased efficiency across a variety of procedures. It allows work to be carried out at great speed, which is essential for saving time during complex procedures.

Compared performance: red ring vs. blue ring vs. green ring

Let us now compare the performance of contra-angles and blue rings. The red ring contra-angle stands out for its high rotation speed, enabling fast and precise work. It is ideal for procedures requiring great precision, such as the careful cutting of hard dental materials. On the other hand, the blue ring contra-angle excels in its versatility, suited to a wide range of dental tasks. It is particularly useful for procedures that do not require very high rotation speeds, such as polishing or prosthetic preparation.

Contra-angles and blue rings are essential tools in the dental surgeon's kit. The choice between the two will depend on the specific needs of each procedure. The red ring offers exceptional power and precision, while the blue ring excels in its versatility. Together, they enable dental professionals to provide superior care to their patients, combining performance and versatility.

Finally, green ring contra-angles are low-speed instruments that can be used for caries excavation, Gates Glidden and Largo drills, and low-speed polishing.

Coxo Red Ring Contra-Angles: The CX235 Range

The CX235 contra-angle range is a collection of high-quality products designed to meet the specific needs of dental health professionals. Each model has unique features, ensuring optimal performance for various dental procedures. Focus on the CX235 C7-6: This non-fibre-optic contra-angle (without light) features a 5:1 rotation ratio. It is equipped with four spray ports and a push-button. Its design allows compatibility with non-light motors, eliminating the attachment issues encountered with fibre-optic models. It is the improved version of the C7-5 model and replaces the C7-2. Improvements include a new gear design, a more efficient spray system and an improved dust cover for better prophylaxis.

CX235 C7-4: Coxo's latest innovation, this fibre-optic contra-angle (with light) features a 1:5 rotation ratio. It is equipped with four spray ports, a push-button and works with 1.60 mm burs. Notable improvements include a reduced-diameter head, a modified angle for better access to posterior teeth, and a dust-proof system to protect the rotor. In addition, the rotor ball bearings are made of ceramic, considerably extending its lifespan.

CX235 C7-3: Ideal for deep surgery, this fibre-optic contra-angle offers a 1:4.2 rotation ratio. It is equipped with four spray ports, producing a water jet rather than a mist. Its head is angled at 45°, offering a compromise between the red contra-angle and the handpiece.

CX235 C7-5S: An improved version of the classic red contra-angle, it features a 1:5 multiplication ratio. Fibre-optic, it is equipped with an external spray for implantology. Improvements include a new fibre-optic system for better visibility, an improved gear design and an optimised dust cover.

Coxo contra-angles also stand out for their price level, which is much lower than that of other brands such as NSK, Kavo or Sirona. They therefore become accessible and affordable tools that reduce your day-to-day expenditure.

For more details about the Coxo Dental brand and the CX-235 range, do not hesitate to contact our team or reach us via the dedicated contact page.

Red ring contra-angle Coxo - NSK: CX235 C7-4 vs. Ti-Max X95L 1:5

When it comes to choosing between the Coxo and NSK brands, two names regularly stand out in the minds of dental professionals. The NSK Ti-Max X95L 15 model is often in direct competition with the Coxo CX 235 C7-4 contra-angle.

Although both models are recognised for their excellence, subtle nuances may influence your choice. Both the Coxo CX235 C7-4 and the NSK Ti-Max X95L 15 are excellent dental contra-angles, offering high rotation speed and increased precision.

Find the CX 235 C7-4 model available on our website for more details about it.

What does not change from one model to the other: Both models offer a rotation speed of up to 200,000 rpm. Both models have a 1:5 multiplication ratio. Both models offer a 4-outlet spray. Both models feature a titanium body. Both models have a dust-proof system that protects the rotor and extends the lifespan of the tool.

The choice between the two will depend on personal preferences, familiarity with the brand and the specific needs of the dental practice. The main differences lie in the price gap and the materials chosen for their manufacture. Expect to pay €300 for a Cx235 C7-4 contra-angle and between €600 and €700 for the Ti-Max X95L 1:5.

The question therefore is: What do you prefer to prioritise in your choice?

Red ring contra-angle vs. dental turbine

When it comes to equipping a dental practice, the choice between a multiplying contra-angle and a dental turbine is a crucial decision that affects the dentist's daily practice. Both instruments have their distinct advantages and disadvantages. Let us take a closer look at the characteristics and performance of each.

Connections and Flexibility

Red contra-angles are designed to work with specific micromotors. These micromotors offer precise control of speed and parameters, making them highly flexible for adapting to various dental procedures. Dental turbines, for their part, often have standardised connections, making them compatible with different micromotors, but they offer less flexibility in terms of parameter adjustment.

Aerosol Management

Multiplying contra-angles have become popular due to their low aerosol production. Dental turbines, due to their high speed, can generate more aerosols during certain procedures. However, suction devices can be used to reduce aerosol production.

Noise level and comfort

Contra-angles are renowned for their low noise and vibration levels. This contributes to the comfort of both the dentist and the patient during treatments. Dental turbines can be noisier due to their high speed. Some turbines are designed to reduce noise, but the contra-angle still has the advantage on this point.

Versatility

Contra-angles meet the same degree as a turbine in terms of the dental surgeon's daily needs.

Lifespan and maintenance

Red contra-angles have a lifespan similar to that of turbines if properly maintained. Rigorous daily maintenance, including lubrication, is essential to ensure their longevity. Turbines may require specific maintenance for the ball bearings and cleaning.

Price

Coxo red contra-angles may have a higher initial cost — expect between €250 and €300, compared to turbines ranging from €90 to €150

Find all of our dental turbines available directly in the Coxo turbine range, for more details on their use and advantages.

Daily use of a red ring contra-angle

Contra-angles are an essential part of a dental surgeon's daily routine. They are used for a variety of procedures, from the careful preparation of cavities to the precise finishing of dental restorations. Their high speed allows for increased efficiency, while their ergonomic design ensures comfort, even during prolonged procedures. These reliable and versatile instruments are trusted companions for ensuring the success of high-quality dental treatments.

In conclusion, contra-angles are indispensable tools for dental surgeons seeking to provide precision dental care. They will be preferred depending on the procedures to be carried out with your patients, so the key will be to choose the model that places you in the best working conditions.

At DFC Instruments, we make the CX235 range — the Coxo contra-angles — available to you, recognised for their performance and reliability. Explore our collection today and discover how these instruments can improve your dental practice for the benefit of your patients and your professional success. Make precision your ally with DFC Instruments contra-angles.

You can also find all of our dental contra-angles in the parent category of this one.