35 doctors weighed in:

What is undercut in dentistry?

35 doctors weighed in
Dr. Anthony Turner
Dentistry
14 doctors agree

In brief: An area of a tooth

An undercut is the result of preparing a tooth for a restoration.
Sometimes it is a desired result such as with an amalgam filling or an undesired result of a crown prep. Physically it is when you look at the tooth from different directions some areas are blocked from view by bulky tooth structure. The image shows the undercut regions for a crown.

In brief: An area of a tooth

An undercut is the result of preparing a tooth for a restoration.
Sometimes it is a desired result such as with an amalgam filling or an undesired result of a crown prep. Physically it is when you look at the tooth from different directions some areas are blocked from view by bulky tooth structure. The image shows the undercut regions for a crown.
Thank
Dr. Raymond Traver
Dentistry
3 doctors agree

In brief: A Concavity

It is an area in a crown preparation or filling prep that, if you look down the path of draw of the prep, you can not see the tooth structure because it is concave and therefore blocked by the rest of the tooth structure.

In brief: A Concavity

It is an area in a crown preparation or filling prep that, if you look down the path of draw of the prep, you can not see the tooth structure because it is concave and therefore blocked by the rest of the tooth structure.
Thank
2 doctors agree

In brief: Tooth preparation

Generally reference is to a cavity preparation whereby the internal preparation is deepened at the expense of one of the walls in the preparation.
or.... a boney prominence in the jaw under which a void lies.

In brief: Tooth preparation

Generally reference is to a cavity preparation whereby the internal preparation is deepened at the expense of one of the walls in the preparation.
or.... a boney prominence in the jaw under which a void lies.
Thank
Dr. Mark Birnbach
Dentistry - Cosmetic
2 doctors agree

In brief: Dentistry

This term may apply to several different areas of dentistry.
Since a silver mercury filling does not bond to tooth structure, a mechanical retention is required to hold it in place- an undercut in healthy structure. The term may also apply to the alignment of teeth- where the undercut prevents the placement of a crown.

In brief: Dentistry

This term may apply to several different areas of dentistry.
Since a silver mercury filling does not bond to tooth structure, a mechanical retention is required to hold it in place- an undercut in healthy structure. The term may also apply to the alignment of teeth- where the undercut prevents the placement of a crown.
Thank
Dr. Daniel Wolter
Dentistry
2 doctors agree

In brief: Retentive Area

The term "undercut" in dentistry is just like in woodworking, home building, and other professions.
It refers to an area which can help in retention. In other words, it's an area into which something can be locked into place. This can be within a tooth, to help hold a filling in place. It can be on the outside of a tooth to help hold a partial denture in place. And so on. Undercuts can be helpful.

In brief: Retentive Area

The term "undercut" in dentistry is just like in woodworking, home building, and other professions.
It refers to an area which can help in retention. In other words, it's an area into which something can be locked into place. This can be within a tooth, to help hold a filling in place. It can be on the outside of a tooth to help hold a partial denture in place. And so on. Undercuts can be helpful.
Thank
1 comment
Dr. Howard Schneider
While undercuts can be helpful for retaining fillings they can also be a big problem for fitting crowns.
Dr. Douglas Tavenner, jr.
Dentistry - Cosmetic
2 doctors agree

In brief: Weaker Tooth

An undercut is where the section nearest to the gum line is narrower than the biting side of the tooth.
When a crown is placed on the tooth, this would cause an air gap within the crown that extra cement would have to fill. This also makes the tooth not as strong.

In brief: Weaker Tooth

An undercut is where the section nearest to the gum line is narrower than the biting side of the tooth.
When a crown is placed on the tooth, this would cause an air gap within the crown that extra cement would have to fill. This also makes the tooth not as strong.
Thank
Dr. Robert Douglas
Dentistry - Orthodontics
1 doctor agrees

In brief: Need more context

i can think of several answers but I need to know in what context this question came up.

In brief: Need more context

i can think of several answers but I need to know in what context this question came up.
Thank
Dr. Victor Zeines
Dentistry
1 doctor agrees

In brief: See below

hold your hands in front of you so that your fingers are pointing straight up.
now flex your arms out so your fingers are beginning to point towards each other.. INstead of being straight up that incline creates an undercut . This occurs when there is decay under an area that is clean and doesn't need to be cut away

In brief: See below

hold your hands in front of you so that your fingers are pointing straight up.
now flex your arms out so your fingers are beginning to point towards each other.. INstead of being straight up that incline creates an undercut . This occurs when there is decay under an area that is clean and doesn't need to be cut away
Thank
Dr. A Paghdiwala
Dentistry
1 doctor agrees

In brief: Bony projection

Besides undercuts on teeth as a result of tooth preparation technique (either for fillings or crowns), dentists also talk about undercuts in the jaw bones.
N these may be naturally occuring or result of extractions of teeth. The dentures rub on the gums overlying the bony undercut and cause sores. The undercuts may need surgical removal, usually the dentures are relieved over the undercuts instead.

In brief: Bony projection

Besides undercuts on teeth as a result of tooth preparation technique (either for fillings or crowns), dentists also talk about undercuts in the jaw bones.
N these may be naturally occuring or result of extractions of teeth. The dentures rub on the gums overlying the bony undercut and cause sores. The undercuts may need surgical removal, usually the dentures are relieved over the undercuts instead.
Thank
1 doctor agrees

In brief: Areas past vertical

This is a tough short answer, but undercut refers to tooth surfaces that would not be touched if a vertical line was laid against the tooth.
If you think about a porch over a front door, the area not being hit by vertical rain would be an undercut. This is important if a crown is being placed because it can not be touching an area that is undercut.

In brief: Areas past vertical

This is a tough short answer, but undercut refers to tooth surfaces that would not be touched if a vertical line was laid against the tooth.
If you think about a porch over a front door, the area not being hit by vertical rain would be an undercut. This is important if a crown is being placed because it can not be touching an area that is undercut.
Thank