<h2 style="text-align:justify">KaVo MASTERmatic M20 L Repair Guide: Fixing the Practice-Standard Blue Ring</h2>

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KaVo calls the MASTERmatic M20 L the practice standard for caries excavation. It is the blue 1:1 contra-angle many clinicians reach for dozens of times a day.

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It also has a feature that changes how repairs work: interchangeable heads. Knowing whether a fault sits in the head or the shank can save real money. 

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<h2 style="text-align:justify">What the M20 L Is</h2>

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KaVo&#39;s MASTERmatic page lists the M20 L (Mat. no. 1.009.3620) as a 1:1 blue contra-angle with a 25,000 lux glass rod light conductor, internally guided separate cooling media, and an exchangeable spray filter. KaVo&#39;s MASTERmatic flyer describes the M20 L as a shank for INTRA LUX interchangeable heads.

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<h2 style="text-align:justify">Head or Shank? The Question That Shapes the Repair</h2>

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<table align="center" cellspacing="0" style="border-collapse:collapse; width:900px">
	<thead>
		<tr>
			<td style="background-color:black; border-bottom:1px solid black; border-left:1px solid black; border-right:1px solid black; border-top:1px solid black; vertical-align:top; width:217px">
			Symptom
			</td>
			<td style="background-color:black; border-bottom:1px solid black; border-left:none; border-right:1px solid black; border-top:1px solid black; vertical-align:top; width:283px">
			More Likely in the Head
			</td>
			<td style="background-color:black; border-bottom:1px solid black; border-left:none; border-right:1px solid black; border-top:1px solid black; vertical-align:top; width:280px">
			More Likely in the Shank
			</td>
		</tr>
	</thead>
	<tbody>
		<tr>
			<td style="background-color:#f2f2f2; border-bottom:1px solid black; border-left:1px solid black; border-right:1px solid black; border-top:none; vertical-align:top; width:217px">
			Bur slips or wobbles
			</td>
			<td style="background-color:white; border-bottom:1px solid black; border-left:none; border-right:1px solid black; border-top:none; vertical-align:top; width:283px">
			Yes: the chuck sits in the head
			</td>
			<td style="background-color:white; border-bottom:1px solid black; border-left:none; border-right:1px solid black; border-top:none; vertical-align:top; width:280px">
			Less likely
			</td>
		</tr>
		<tr>
			<td style="background-color:#f2f2f2; border-bottom:1px solid black; border-left:1px solid black; border-right:1px solid black; border-top:none; vertical-align:top; width:217px">
			Roughness at the tip
			</td>
			<td style="background-color:white; border-bottom:1px solid black; border-left:none; border-right:1px solid black; border-top:none; vertical-align:top; width:283px">
			Yes
			</td>
			<td style="background-color:white; border-bottom:1px solid black; border-left:none; border-right:1px solid black; border-top:none; vertical-align:top; width:280px">
			Possible
			</td>
		</tr>
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			<td style="background-color:#f2f2f2; border-bottom:1px solid black; border-left:1px solid black; border-right:1px solid black; border-top:none; vertical-align:top; width:217px">
			Dim light
			</td>
			<td style="background-color:white; border-bottom:1px solid black; border-left:none; border-right:1px solid black; border-top:none; vertical-align:top; width:283px">
			Possible
			</td>
			<td style="background-color:white; border-bottom:1px solid black; border-left:none; border-right:1px solid black; border-top:none; vertical-align:top; width:280px">
			Yes: glass rod runs through the body
			</td>
		</tr>
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			<td style="background-color:#f2f2f2; border-bottom:1px solid black; border-left:1px solid black; border-right:1px solid black; border-top:none; vertical-align:top; width:217px">
			Weak spray
			</td>
			<td style="background-color:white; border-bottom:1px solid black; border-left:none; border-right:1px solid black; border-top:none; vertical-align:top; width:283px">
			Possible
			</td>
			<td style="background-color:white; border-bottom:1px solid black; border-left:none; border-right:1px solid black; border-top:none; vertical-align:top; width:280px">
			Possible: filter and channels
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			<td style="background-color:#f2f2f2; border-bottom:1px solid black; border-left:1px solid black; border-right:1px solid black; border-top:none; vertical-align:top; width:217px">
			Loose on the motor
			</td>
			<td style="background-color:white; border-bottom:1px solid black; border-left:none; border-right:1px solid black; border-top:none; vertical-align:top; width:283px">
			No
			</td>
			<td style="background-color:white; border-bottom:1px solid black; border-left:none; border-right:1px solid black; border-top:none; vertical-align:top; width:280px">
			Yes: coupling and O-rings
			</td>
		</tr>
	</tbody>
</table>

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KaVo&#39;s INTRA LUX heads page describes 14 interchangeable heads with a quick-action safety retention collar. If you have a spare head, swapping it is a fast way to see which part is at fault.

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<h2 style="text-align:justify">Symptoms Worth a Bench Check</h2>

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<ul>
	<li>
	A bur that will not stay secure
	</li>
	<li>
	Roughness or new noise after correct lubrication
	</li>
	<li>
	Dim light on a LUX motor
	</li>
	<li>
	Weak spray after a filter change
	</li>
</ul>

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For more information, visit Repair Guru:

&nbsp;

<ul>
	<li><a href="https://repair.dental/repairguru/cad-cad-software-support/activation-issues-common-solutions">Activation Issues: Common Solutions</a></li>
	<li><a href="https://repair.dental/repairguru/cad-cad-software-support/multi-seat-licensing-management-tools">Multi-Seat Licensing: Management Tools</a></li>
	<li><a href="https://repair.dental/repairguru/cad-cad-software-support/smile-design-integration-workflow">Smile Design: Integration Workflow</a></li>
</ul>

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<h2 style="text-align:justify">Warranty and KaVo REPAIR</h2>

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KaVo lists a 24-month warranty for MASTERmatic instruments. Check coverage first, and contact KaVo REPAIR if it applies.

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<h2 style="text-align:justify">How Repair.Dental Evaluates an M20 L</h2>

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<ol>
	<li>
	We separate the head from the shank and test each.
	</li>
	<li>
	We check bur retention and smoothness at the head.
	</li>
	<li>
	We test light, spray, and coupling on the shank.
	</li>
	<li>
	We tell you which part needs work, and which does not.
	</li>
</ol>

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Repair only what is broken. Send your M20 L to Repair.Dental, and we will pinpoint the head or shank.

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<h2 style="text-align:justify">Getting Years From a Daily Workhorse</h2>

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Our M20 L care guide covers head-change routines and daily care. Practices that want a technician to track this can use our Preventive Maintenance Agreement.

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<a href="https://repair.dental/print-shipping-label/handpiece-repair">Start Your Repair</a>

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<h2 style="text-align:justify">M20 L Repair FAQs</h2>

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What is the M20 L used for?

KaVo describes it as the practice standard for caries excavation.

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Can the head be changed?

KaVo&#39;s MASTERmatic flyer describes the M20 L as a shank for INTRA LUX interchangeable heads.

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<hr />
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;<a href="https://www.instagram.com/repair.dental/"> Instagram</a>.

KaVo MASTERmatic M20 L 1:1 blue contra-angle rough, dim or losing grip? Learn how the shank and heads work and when to repair.

KaVo MASTERmatic M20 L Repair Guide | Repair.Dental