16 Questions
What is the primary goal of tooth preparation?
To restore the integrity of the tooth surface and function
What is dental caries?
An infectious microbiologic disease that results in localized dissolution and destruction of the calcified tissues of the teeth
What is nomenclature in the context of dentistry?
A set of terms used in communication by persons in the same profession
What is the term used to describe a tooth preparation that involves only one tooth surface?
Simple
What is the characteristic of pit-and-fissure caries?
It forms a small area of penetration in the enamel at the bottom of a pit or fissure
What is the shape of the carious lesion in pit-and-fissure caries?
Two cones, base to base
What is the abbreviation for a tooth preparation involving the mesial and occlusal surfaces?
MO
What is the direction of the apex of the dentin cone in pit-and-fissure caries?
Towards the pulp
What is the term used to describe the surface of a tooth preparation that faces the adjacent tooth?
Proximal
What type of caries affects the root surfaces of the tooth?
Senile caries
What is the term used to describe an internal cavity surface lying in the direction of the long axis of the tooth?
Axial Wall
What is the base of the cone in smooth-surface caries?
On the enamel surface
What is the term used to describe a prepared surface that extends to the external tooth surface?
External Wall
What is the term used to describe the junction of two or more prepared surfaces?
Angle
What is the term used to describe an angle formed by the junction of two walls along a line?
Line Angle
What is the term used to describe a prepared wall that is reasonably flat and perpendicular to the long axis of the tooth?
Floor
Study Notes
Definition of Tooth Preparation
- Tooth preparation is the mechanical alteration of a defective, injured, or diseased tooth to receive a restorative material that reestablishes a healthy state for the tooth with normal form and function.
Objectives of Tooth Preparation
- Remove diseased tissue as necessary
- Restore the integrity of the tooth surface
- Restore the function of the tooth to withstand mastication forces
- Restore the appearance of the tooth
Nomenclature and Tooth Preparation Terminology
- Nomenclature refers to a set of terms used in communication by persons in the same profession
- Tooth preparation terms:
- Simple: involving one tooth surface
- Compound: involving two surfaces
- Complex: involving three or more surfaces
- Abbreviated descriptions of tooth preparations:
- O: occlusal tooth preparation
- MO: preparation involving mesial and occlusal surfaces
- MOD: preparation involving mesial, occlusal, and distal surfaces
Tooth Preparation Walls
- Proximal wall: surface facing the adjacent tooth
- Internal wall: a prepared surface that does not extend to the external tooth surface
- Axial wall: internal cavity surface lying in the direction of the long axis of the tooth
- Pulpal wall: internal cavity surface lying horizontally in relation to the pulp, oriented perpendicular to the long axis of the tooth
- External wall: prepared surface that extends to the external tooth surface, takes the name of the tooth surface it faces
Tooth Preparation Angles and Line Angles
- Tooth preparation angles: junction of two or more prepared surfaces
- Line angles: angle formed by the junction of two walls along a line
- Examples of line angles:
- Axio-pulpal line angle
- Bucco-axial line angle
- Gingivo-axial line angle
Learn about the definition and objectives of tooth preparation in operative dentistry, including removing diseased tissue and restoring tooth function.
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