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What Are Inlays and Onlays?

You’ve probably heard your dentist mention inlays and onlays at least once, but what exactly are they? These restorations are another way to fix damaged teeth and can be an alternative to regular fillings or crowns. 

Learn more about what inlays and onlays are, how they work, how long they last, and when they might be the right choice for you below. 


What Are Inlays and Onlays?

Inlays and onlays are custom-made dental restorations that are used to repair teeth that have been damaged by decay, injury, or everyday wear. They’re often referred to as indirect fillings because they’re made outside of your mouth and then securely bonded to your tooth.


Inlays

Inlays are used when the damage is limited to the center of the tooth, between the raised edges, called cusps. They’re an option for small to medium-sized cavities that are too big for a regular filling but don’t need a full crown.


Onlays

Onlays cover a larger area and are used when the damage includes one or more of those raised edges. They’re helpful for when a tooth is weakened but can still be saved without a full crown.


Inlays vs. Onlays

Both restoration options repair damaged teeth, but they’re used a little differently depending on how much of the tooth needs to be restored. Inlays fit neatly inside the chewing surface of the tooth, between the cusps, and are best for smaller areas of damage. Onlays, on the other hand, cover one or more cusps and are better for more extensive repairs. 

Both are made from durable materials like porcelain, resin, or gold. The main difference comes down to how much of the tooth needs to be treated. Onlays usually require removing a bit more tooth structure than inlays. 


How Do Inlays and Onlays Work?

The process of getting inlays and onlays involves several steps, which are typically completed over two dental visits. Here’s a breakdown of the procedure. 


  1. Initial Consultation

    2. Your dentist will examine your tooth and may take X-rays to see how much damage there is; this will help determine whether an inlay or onlay is an option.


  2. Decay Removal

    3. If so, your dentist will remove any decay or damaged parts of the tooth to prepare it for the restoration.


  3. Impressions

    4. Next, your dentist will take an impression of the prepared tooth; this mold is then sent to a lab where your custom inlay or onlay is made. While you wait for the final piece, a temporary filling is placed to protect your tooth and keep it functional.


  4. Fitting the Restoration and Final Adjustments

    5. At your second visit, the temporary filling is removed, and the new inlay or onlay is carefully fitted and bonded to your tooth. Once it’s in place, your dentist will check your bite and make any final tweaks to make sure everything feels comfortable.


How Long Do Inlays Last?

With the proper care, inlays can last anywhere from 10 to 30 years. That said, their lifespan depends on a few things, like the material they’re made from (porcelain usually lasts longer than resin), your oral hygiene habits, and even your diet. For instance, chewing on hard foods can cause damage over time.


How Long Do Onlays Last?

Like inlays, onlays can last 10 to 30 years, depending on how you take care of them. Gold onlays are the longest-lasting, while porcelain ones may need a bit more tending over time. Good brushing and flossing habits can also go a long way, and avoiding things like teeth grinding or chewing on hard objects will help prevent damage.  


Inlays and Onlays FAQs


Are Inlays and Onlays Painful?

No, getting inlays or onlays isn’t usually painful. Your dentist will numb the area with local anesthesia so you’ll stay comfortable during the procedure. You might feel a little sore afterward, but that typically fades quickly.


Can I Get Cavities with an Inlay or Onlay?

Yes, cavities can still form around the edges of an inlay or onlay if you don’t keep up with good oral hygiene. Regular cleanings and checkups help catch any problems early before they turn into something bigger.


Is an Inlay Better Than a Filling?

The short answer is they can be. If the damage is more than a filling can fix but not quite enough for a crown, your dentist might recommend an inlay as an in-between solution. Generally speaking, compared to traditional fillings, inlays are stronger, longer-lasting, and can be made to blend in naturally with your teeth.


Is an Onlay Better Than a Crown?

Yes, in some cases, onlays may be a better choice than a dental crown. Onlays preserve more of your natural tooth, can restore strength without changing the tooth’s shape too much, and are typically less invasive.


Schedule an Appointment with Our Point Pleasant Cosmetic Dentist

Are you considering inlays or onlays? At Coastal Dental Group, our team specializes in personalized care that fits your needs. Call us at 732-714-1030 or contact us online to schedule an appointment today!

About the Author

Dr. Joseph Zicchino provides a wide array of cosmetic dentistry services, including Invisalign® Clear Aligners, at his practice in Point Pleasant, NJ. He earned his dental degree from NYU Dental School and established Coastal Dental Group in 2004. For more information or to schedule an appointment, call (732) 714-1030!