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Both fillings and onlays are used to repair teeth damaged by decay, but they differ in how they are made, applied, and how much tooth structure they can restore.

What Are Dental Fillings?

Fillings are placed directly into a cavity after the decayed portion of the tooth has been removed. The filling material — usually composite resin — is shaped and hardened inside the mouth in a single visit. Fillings work best for small to moderate cavities where the tooth structure is still largely intact.

What Are Onlays?

Onlays (sometimes called partial crowns) are indirect restorations made in a dental laboratory. They are custom-crafted from porcelain or composite material to precisely fit the prepared tooth. Onlays are used when the damage is too extensive for a simple filling but not severe enough to require a full dental crown. They cover one or more cusps of the tooth, providing superior strength and durability.

Why Choose Onlays Over Fillings?

Onlays preserve more natural tooth structure than crowns, provide better strength than large fillings, and can last significantly longer — often 15 to 30 years compared to 5 to 10 years for composite fillings. They also offer a more precise fit and superior aesthetics. At Dent Health Istanbul, our in-house lab creates high-quality onlays for optimal fit and longevity. Contact us to learn which option is right for you.