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Inlays & Onlays

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Conservative repairs when a filling isn’t enough

Inlays and onlays are conservative restorations for teeth with damage too extensive for a regular filling but not severe enough to need a full crown. They repair only the damaged portion of the tooth, preserving more of your healthy natural structure while restoring strength, function, and appearance. In many cases, we can design, mill, and place your restoration in a single visit.

How they differ from fillings and crowns

Fillings are shaped directly in the tooth and work well for small cavities. Inlays and onlays are fabricated outside the mouth to replace larger areas of lost tooth structure, then bonded into place, giving greater durability and a better seal against future decay. Compared with a crown, which covers the entire visible tooth, an inlay or onlay is more conservative and keeps healthy enamel and dentin intact.

They are especially well suited to molars and premolars that take heavy chewing forces, where a standard filling may fail early but a crown would remove more healthy tooth than necessary.

Materials and same-day digital fabrication

Modern inlays and onlays are made from high-quality ceramics or zirconia, biocompatible, stain-resistant materials that closely match natural tooth color. Zirconia is prized for strength and longevity, while ceramic offers a slightly more translucent, natural look. We help you choose based on the tooth’s location, the extent of damage, your bite, and your cosmetic goals.

Instead of traditional impressions, an intraoral scanner captures a precise 3D image of the prepared tooth and your bite. The restoration is designed with CAD/CAM software and, in many cases, milled on-site using our Perfit Ovis zirconia mill. Because the whole workflow is digital, scan, design, mill, finish, treatment can often be completed in one visit, with no temporary and no second appointment.

What to expect during treatment

After an exam and a discussion of your options, the tooth is prepared under local anesthesia, removing decay or old restorative material while preserving as much healthy structure as possible. A digital scan is taken, the restoration is milled, and it is then bonded to the tooth with precise adhesive techniques. We check the fit, adjust the bite, and polish the margins for a smooth, natural transition.

Aftercare is simple:

  • Avoid very hard foods for a short time after placement
  • Brush twice daily with fluoride toothpaste and floss once a day
  • Report any sensitivity or fit concerns so we can evaluate promptly

Durability and long-term care

Properly designed and bonded, inlays and onlays can provide many years of reliable service and are less prone to wear and leakage than large direct fillings. Regular checkups let us monitor the restoration’s margins, watch for recurrent decay, and keep the surrounding gum tissue healthy.

If you clench or grind your teeth, a night guard can reduce stress on both your restorations and your natural teeth, helping your inlay or onlay last as long as possible.

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Frequently Asked Questions

What are porcelain inlays and onlays?

Porcelain inlays and onlays are indirect restorations custom made to fit a prepared area of a tooth that has been damaged by decay or injury. They are fabricated outside the mouth, then bonded to the tooth surface for a precise fit and natural appearance. These restorations are designed to restore strength and function while matching the color and translucency of surrounding teeth.

An inlay typically restores the central chewing surface of a back tooth, while an onlay extends over one or more cusps to rebuild larger areas. Because they are made from durable ceramic materials, porcelain inlays and onlays resist staining and wear better than many direct filling materials. Their tailored fit preserves more healthy tooth structure than full coverage crowns in appropriate cases.
Fillings are direct restorations placed and shaped in a single visit, which makes them suitable for small cavities and minor repairs. In contrast, inlays and onlays are indirect restorations made in a laboratory or by CAD/CAM systems, offering greater precision for larger or more complex defects. Crowns provide full coverage of the visible tooth and are used when the remaining tooth structure cannot be reliably restored with an inlay or onlay.

Because inlays and onlays are bonded to the tooth, they can reinforce weakened structure while conserving more healthy enamel and dentin than crowns. The choice between a filling, an inlay/onlay, and a crown depends on the extent of damage, remaining tooth structure, and functional demands. Your dentist will evaluate the situation and recommend the most conservative, durable option.
Porcelain inlays and onlays offer excellent aesthetics because they can be color matched to natural teeth and mimic the translucency of enamel. They are stain resistant and maintain their appearance over time, making them a good choice for visible posterior restorations. Additionally, porcelain restorations can increase the strength of a prepared tooth significantly when properly bonded.

These restorations are also conservative, preserving more healthy tooth structure compared with full coverage crowns in suitable cases. Their precise fabrication reduces the risk of marginal gaps and recurrent decay when the fit and bonding are done correctly. Finally, porcelain inlays and onlays provide a durable long-term solution when combined with good oral hygiene and regular dental care.
Placement typically begins with a thorough examination and conservative removal of decayed or compromised tooth structure. The tooth is then shaped to receive the restoration, and an impression or digital scan is taken to capture the exact anatomy of the preparation. A custom inlay or onlay is fabricated from that impression using laboratory techniques or in-office CAD/CAM milling.

Once the restoration is ready, the fit is checked and adjustments are made before bonding. The restoration is bonded to the prepared tooth with a strong resin cement and cured to create a secure, sealed interface that restores function and aesthetics. At Kary Dental we combine careful preparation and modern bonding protocols to achieve a precise, long-lasting result.
Longevity depends on factors such as material choice, the quality of the bond, occlusal forces, and the patients oral hygiene habits. Well-made porcelain inlays and onlays can last many years, often a decade or longer with proper care and routine dental examinations. Regular maintenance and avoiding undue stress on the restoration help extend its service life.

Bruxism, recurrent decay at the margins, and traumatic forces can shorten the lifespan of any restoration and may require earlier repair or replacement. Your dentist will monitor the restoration during regular visits and recommend protective measures, such as a night guard, if grinding is a concern. Timely attention to minor issues helps prevent more extensive restorative needs later on.
Good candidates are patients with moderate decay, fractured cusps, or old restorations where a conservative indirect restoration will restore function without removing excessive healthy tooth structure. Teeth that have sufficient remaining walls and sound supporting structure are ideal candidates for inlays or onlays. Patients seeking an aesthetic, stain-resistant option for posterior teeth often prefer porcelain restorations.

Extensive tooth breakdown, active periodontal disease, or untreated infection may require other treatments before considering an inlay or onlay. Your dentist will perform a comprehensive exam and take X-rays or scans to determine whether an inlay, onlay, or crown is the most appropriate treatment. The decision balances preservation of tooth structure with long-term function and protection.
Common materials include porcelain, composite resin, and gold, each with specific strengths and considerations. Porcelain offers superior aesthetics and stain resistance, making it suitable when appearance is important, while gold provides exceptional durability and is less likely to fracture under heavy bite forces. Composite resin can be more easily repaired and adjusted but may wear or stain more quickly than porcelain.

Material selection depends on factors such as the location of the tooth, occlusal forces, aesthetic goals, and the amount of remaining tooth structure. Modern ceramics are engineered to combine strength with a natural look, and bonding protocols vary slightly between materials to optimize retention. Your dentist will recommend the material that best meets functional and cosmetic needs for your situation.
After placement, maintain a routine of brushing twice daily with a fluoride toothpaste and flossing once a day to reduce the risk of recurrent decay at the margins. Avoid chewing very hard or sticky foods directly on the restored tooth for a short period while bonding materials fully cure and the restoration settles. If you clench or grind your teeth, ask your dentist about a custom night guard to protect the restoration from excessive forces.

Attend regular dental checkups so your dentist can assess the integrity of the restoration, check for wear, and make minor adjustments if needed. Promptly report any persistent sensitivity, a noticeable high bite, or a change in the way the restoration feels when chewing. Early detection of issues helps preserve the restoration and the underlying tooth for the long term.