<h2 style="text-align:justify">Does a Speed-Increasing Straight Handpiece Need Different Care?</h2>

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The core routine is the same as for any straight handpiece: clean it, lubricate it as the manufacturer describes, and sterilize it. What changes is the level of attention. COXO lists the S-2Z (model CX235-2) as a speed-increasing straight handpiece, which means its gears and bearings work at higher speed than in a direct-drive model. Consistent care matters more, and changes in sound or temperature deserve quicker attention.

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In a dental lab, where a straight handpiece may run for long periods trimming and adjusting restorations, this matters even more. Longer running time means more cumulative wear on the gear stage and bearings, so the habits below are worth building into every shift rather than saving for an occasional deep clean.

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<h2 style="text-align:justify">Where Do I Find the Official Care Steps?</h2>

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COXO&#39;s product page for the S-2Z does not include a care procedure, so follow the instructions supplied with your handpiece. If you no longer have them, ask your authorized COXO distributor. COXO&#39;s general FAQ states that autoclaving is generally recommended for its handpieces and that they use high-temperature resistant bearings and O-rings.

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<h2 style="text-align:justify">Can I Use Any Sterilization Method?</h2>

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No. COXO&#39;s FAQ advises against ethylene oxide (EO) sterilization unless the user manual specifically allows it. Autoclaving is the method COXO generally recommends. If your sterilizer&#39;s performance is in doubt, Repair.Dental offers <a href="https://repair.dental/services/dental-sterilizer-repair">dental sterilizer repair</a>.

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A sterilizer that is not reaching its intended cycle conditions affects every instrument it processes, not just the S-2Z. If you notice wet loads, error messages or inconsistent results, it is worth having it checked.

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<h2 style="text-align:justify">What Should I Do Straight After Each Use?</h2>

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<ol>
	<li>
	Remove the bur or polishing cup.
	</li>
	<li>
	Detach the handpiece from the motor.
	</li>
	<li>
	Clean the outside and the external water channel.
	</li>
	<li>
	Lubricate as your instructions describe.
	</li>
	<li>
	Sterilize.
	</li>
</ol>

&nbsp;

The order matters. Cleaning first removes debris that would otherwise be baked on during sterilization. Lubricating before sterilization, as most handpiece instructions require, protects the gears and bearings through the cycle. If your instructions give a different order, follow them, since they are written for your specific handpiece.

<h2 style="text-align:justify">&nbsp;</h2>

<h2 style="text-align:justify">Does Using Polishing Cups Change the Routine?</h2>

&nbsp;

COXO lists the S-2Z as accepting disposable polishing cups as well as straight handpiece burs. Polishing paste is abrasive, so remove the cup straight after use and clean away paste before it dries. Dried paste near the chuck is a common cause of stiff or unreliable bur grip later.

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Juggling care for several straight handpieces across a lab or clinic? Repair.Dental&#39;s <a href="https://repair.dental/services/dental-equipment-monthly-maintenance-plans">monthly maintenance plans</a> can take on the routine checks.

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<h2 style="text-align:justify">How Do I Look After the External Water Channel?</h2>

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The S-2Z uses an external water channel. Keep the line clean, straight and firmly attached, and check the spray at the start of each session. A weaker spray usually means a kink, a loose fitting or deposits in the line.

&nbsp;

Because the line sits outside the handpiece, it is also easy to damage. Avoid crushing it in storage drawers or bending it sharply when the handpiece is put down. A line that has been kinked repeatedly may need replacing.

&nbsp;

<h2 style="text-align:justify">How Often Should I Check the Chuck?</h2>

&nbsp;

A weekly grip test is a practical habit. Seat a new bur fully and pull firmly. Never release a bur while the handpiece is still turning, as this wears the chuck quickly.

&nbsp;

If your team switches often between burs and polishing cups, check the chuck a little more frequently. Frequent changes, and paste residue from polishing, both add wear. A chuck that starts to need reseating is giving an early warning worth acting on.

<h2 style="text-align:justify">&nbsp;</h2>

<h2 style="text-align:justify">What Signs Mean Care Is No Longer Enough?</h2>

&nbsp;

<ul>
	<li>
	A change in sound, such as clicking, whining or roughness.
	</li>
	<li>
	Warmth at the working end, which as general guidance is a reason to stop using any speed-increasing handpiece.
	</li>
	<li>
	A bur that slips after a new bur is fitted.
	</li>
	<li>
	Spray that stays weak after the line is checked.
	</li>
</ul>

&nbsp;

Any of these means it is time for <a href="https://repair.dental/services/handpiece-repair">professional handpiece repair</a>.

&nbsp;

<h2 style="text-align:justify">How Should I Store the S-2Z?</h2>

&nbsp;

<ul>
	<li>
	Store it clean and dry after sterilization.
	</li>
	<li>
	Keep the chuck empty during storage.
	</li>
	<li>
	Protect it from drops and knocks.
	</li>
	<li>
	Keep the external water line uncoiled and uncrushed.
	</li>
</ul>

&nbsp;

In a lab, a dedicated holder at each bench helps prevent the handpiece being dropped or left lying among other tools. Dropping a straight handpiece can damage the gear stage or bearings even if nothing looks wrong from the outside.

&nbsp;

<h2 style="text-align:justify">Does the Motor Need Attention Too?</h2>

&nbsp;

Yes. The S-2Z connects through a standard ISO connection to a low-speed motor, and the motor has its own care requirements. Follow the motor manufacturer&#39;s instructions. A motor in poor condition can make a healthy handpiece feel faulty. For low-speed systems in general, our <a href="https://repair.dental/repairguru/handpieces/titan-t-low-speed-system-maintenance-guide">Titan-T low-speed maintenance guide</a> offers further ideas.

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<h2 style="text-align:justify">Still Have a Question?</h2>

&nbsp;

If your question is not covered here, the <a href="https://repair.dental/faq">Repair.Dental FAQ</a> answers common questions about equipment care and repair, or you can <a href="https://repair.dental/contact">contact the team directly</a>.

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For more insights on professional dental equipment repair, please visit&nbsp;<a href="https://repair.dental/">Repair.Dental</a> or follow us on&nbsp;<a href="https://www.facebook.com/repair.dental">Facebook</a> &amp;&nbsp;<a href="https://www.instagram.com/repair.dental/">Instagram</a>.

Ten practical questions about caring for a COXO S-2Z speed-increasing straight handpiece, from cleaning and sterilization to burs and storage.

COXO S-2Z Care: 10 Questions, Clear Answers | Repair.Dental