The space between a filling and a crown
Inlays and onlays work much like fillings in that they replace damaged or decayed portions of a tooth. The key difference is where they fit in the range of restorations. A standard filling may not provide enough support for a heavily damaged tooth, yet a crown - which covers the whole tooth - can require reshaping structure that is still healthy. An inlay or onlay occupies that middle ground: it addresses only the damaged area, leaving healthy tooth structure intact and supported.
They are used specifically on molars and premolars - the back teeth with multiple cusps. An inlay repairs the area between those cusps, while an onlay does the same and also extends to cover one or more cusps. Once bonded in place, both allow normal daily use with no change to your regular at-home dental care routine.
What they are made of and how placement works
Inlays and onlays are crafted outside the mouth - in a dental lab or with in-office milling equipment - and then bonded directly to the tooth. They are commonly made from porcelain, ceramic, or gold. Porcelain and ceramic options blend closely with the natural color of surrounding teeth, while gold is recognized for its durability. All three materials are long-lasting and straightforward to maintain.
In most cases, placement involves two appointments: one to take impressions and prepare the tooth, and a second to bond the finished restoration. Gold restorations always follow this two-visit path. The source material also references in-office same-day fabrication as an option that can eliminate the need for a temporary restoration - contact us to confirm which approaches we currently offer at Sendero Dental Studio in Rancho Mission Viejo.
When an inlay or onlay is the right choice
Your dentist will consider an inlay or onlay when a filling would leave too little remaining tooth structure to function well, or when the extent of damage is not enough to justify the full reshaping a crown requires. The result is a restoration that supports and strengthens the tooth without removing healthy material unnecessarily.
That said, there are situations where a filling or a crown remains the more appropriate solution. The best way to know which restoration fits your specific tooth is to have a conversation with our team - we are glad to walk you through the options.
Keeping your restoration in great shape
Once an inlay or onlay is bonded in place, caring for it is no different from caring for a natural tooth. Brush twice a day, floss once daily, and keep up with a healthy diet. With consistent care, inlays and onlays are built to last many years. If you ever have questions about maintaining your restoration, our team is happy to help.