HOSA Dental Terminology Practice

What does the term 'distal third' refer to?

1. The portion of the tooth closest to the midline

2. The third farthest from the midline viewed from the facial or lingual surface

3. The visible part of a tooth above the gums

4. The section of a molar closest to an incisor

The correct answer is: The third farthest from the midline viewed from the facial or lingual surface

The term 'distal third' specifically refers to a portion of a tooth or a structure that is located furthest away from the midline when viewed from the facial (front) or lingual (tongue side) surfaces. In dental terminology, 'distal' indicates the side of the tooth that is farthest from the centerline of the dental arch, making it essential to understand when describing the location of cavities, restorations, or anatomical features of teeth. The concept of 'thirds' in dentistry applies to dividing the tooth's surface into three sections, and identifying the 'distal third' helps in precise communication about treatment and tooth anatomy. This terminology becomes particularly useful when dealing with restorative materials or procedures, as it allows dental professionals to specify which area of the tooth requires attention. For example, a cavity located in the distal third would be farthest from the midline, thus affecting planning for treatment or restoration placement. Understanding the distinction between this and other terms is crucial for effective communication in dental practice. The other options relate to concepts like midline proximity, visible parts of teeth, or specific sections in relation to other teeth, which do not capture the essence of what 'distal third' indicates in dental terminology.