Is a porcelain onlay as strong as a metal one?

Porcelain onlays are strong and aesthetically pleasing, but may not be as durable as metal in high-stress areas. Material choice depends on the specific clinical situation.

How long does a porcelain onlay last?

With proper care, a porcelain onlay can last 10-15 years or more, depending on factors like oral hygiene and bite forces.

Can an onlay be repaired if it chips or cracks?

Minor chips may be repaired with composite resin, but significant damage often requires replacement of the onlay.

Are there any special care instructions for porcelain onlays?

Maintain good oral hygiene, avoid biting on hard objects, and attend regular dental check-ups to ensure the longevity of the onlay.

D2644

Onlay Porcelain/Ceramic - CDT Code Guide

Restorative/Inlay/Onlay Restorations

Overview

CDT Code D2644 pertains to the placement of an onlay made from porcelain or ceramic material, covering four or more surfaces of a tooth. This restorative procedure is typically used when a tooth has been damaged by decay or fracture but retains enough healthy structure to avoid a full crown. The onlay helps restore the tooth's function and aesthetics by covering the cusps and providing strength. Dental professionals often choose this procedure for patients who require a durable and aesthetically pleasing restoration, particularly in posterior teeth where chewing forces are significant.

When to Use This Code

When a tooth has extensive decay affecting four or more surfaces but does not require a full crown.
In cases where a patient desires a metal-free restoration for aesthetic reasons.
When a tooth has fractured cusps that need coverage and protection.
For patients with large existing restorations that need replacement due to failure or recurrent decay.
In situations where preserving as much natural tooth structure as possible is a priority.

Documentation Requirements

Detailed clinical notes describing the extent of decay or damage.
Pre-operative and post-operative radiographs to support the necessity of the onlay.
A clear treatment plan outlining the need for a four-surface restoration.
Patient consent forms acknowledging understanding of the procedure and material choice.
Documentation of any previous restorations or treatments on the affected tooth.

Billing Considerations

Ensure that the procedure is not billed more frequently than allowed by the patient's insurance plan, as some plans may have frequency limitations on major restorative procedures. Common modifiers include those for different quadrants or arches. Verify coverage for porcelain/ceramic materials, as some insurers may have specific guidelines or exclusions.

Related CDT Codes

D2394 D2740 D2750 D2950

Frequently Asked Questions

An onlay covers one or more cusps of a tooth, preserving more natural tooth structure, while a crown covers the entire tooth.

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