The Parts of a Dental Implant: Fixture, Abutment and Crown

The fixture, also called the implant body, is the screw that sits inside the jawbone. It is usually titanium, which bonds with bone, though tooth-coloured zirconia fixtures exist. It is hidden from view and is the part that has to stay for decades. The materials and designs are compared in types of dental implants.

The surface is deliberately roughened because bone grows onto a textured surface better than onto a polished one. The inside of the top has a threaded socket where the other parts connect. Fixtures come in different widths and lengths, chosen from your scan to fit the bone you have.

After the fixture is placed, its top is closed with either a cover screw buried under the gum or a healing cap that sits level with the gum. Either one keeps the socket clean while the bone bonds to the fixture, a process explained in the guide to osseointegration.

A healing cap also shapes the gum into a collar so that the crown later emerges naturally. It is temporary and is swapped for the abutment when healing is done. It is not meant for chewing, and a loose one should be reported.

The abutment is the connector between the fixture and the crown. It screws into the fixture and passes through the gum. A stock (prefabricated) abutment comes in standard shapes and is quicker and cheaper. A custom abutment is milled or cast for your mouth and follows the gum line and the angle of the tooth. It is often chosen for front teeth, or where the fixture sits at an angle.

Titanium abutments are strong and well proven. Zirconia abutments are tooth-coloured and avoid a grey shadow under thin gum, which matters for a visible tooth, though they can be less forgiving at awkward angles. Many people have a titanium base with a zirconia top. The right choice depends on gum thickness, visibility and bite.

The crown is the part you see, made of zirconia, porcelain fused to metal, or a similar material. A screw-retained crown is held by a small screw, usually reached through a hole in the chewing surface that is then sealed with filling material. A cement-retained crown is glued to the abutment.

Why it matters: a screw-retained crown can be unscrewed, cleaned or repaired without cutting it. A cement-retained crown can have a better-looking chewing surface, but leftover cement under the gum can inflame it, and removing the crown may damage it. Neither is always right. The crowns for dental implants are made in the same materials as other crowns.

The fixture rarely fails once it has bonded, though it can be lost to gum infection or overload. The parts that wear or loosen are the screws, the crown surface and any acrylic teeth. A loose abutment screw is the commonest repair and is a short visit: the crown is removed or accessed, the screw is cleaned and tightened to a set torque, and the crown is refitted.

A chipped porcelain crown is replaced without touching the fixture. A fractured screw can be removed with special instruments, and a fractured abutment is replaced. Only if the fixture itself is lost does surgery start again. Regular reviews, described in how to look after dental implants, catch loosening early. Whether a spare part can be sourced years later is worth asking about before treatment, and the dental implants page covers the wider treatment.

Ask which implant system and which abutment type are planned, and whether the quote covers the abutment and the crown as well as the fixture. A low figure that covers only the fixture leaves the rest to be charged later. The dental implant cost in Lucknow page explains how to read a quote.

Ask for the name of the system in writing and keep it with your records. Years from now, a dentist who needs a matching screw or abutment will need to know exactly what was placed. Systems that are no longer made can be hard to repair, and that is a practical reason to choose one with a long record and a wide supply of parts.

Ask also whether the crown will be screw-retained, and whether the screw access hole will show. At the back of the mouth it hardly matters. At the front it can shape the whole plan.