Dentistry Chapter 1: Tooth Form and Occlusion

On the lingual surfaces of posterior teeth, the facial contour is located at which part of the crown?

Middle third

What is the primary consequence of over-contouring?

Chronic inflammatory state of the gingiva

Proximal contact areas are generally larger in which region?

Molar region

What is the primary function of properly formed and located proximal contacts and associated embrasures?

Protecting underlying supporting tissue during mastication Signup and view all the answers

What is the typical location of proximal contact areas in maxillary and mandibular central incisors?

Incisal third of the approximating surfaces Signup and view all the answers

What is the term for the V-shaped spaces that originate at the proximal contact between adjacent teeth?

Embrasures Signup and view all the answers

Under-contouring can result in what kind of trauma?

Trauma to the attachment apparatus Signup and view all the answers

What is the primary purpose of embrasures?

To offer protection to underlying supporting tissue Signup and view all the answers

Where are proximal contact areas typically located in posterior teeth?

Middle third of the approximating surfaces Signup and view all the answers

What is the consequence of improper contours on oral health?

Leading to chronic inflammatory state of the gingiva Signup and view all the answers

What is the primary consequence of improper contacts between teeth?

Periodontal disease and halitosis Signup and view all the answers

What is the function of the correct relationships of embrasures, cusps to sulci, marginal ridges, and grooves?

To provide for the escape of food from the occlusal surfaces during mastication Signup and view all the answers

What happens when an embrasure is decreased or absent?

Additional stress is created on teeth and the supporting structures during mastication Signup and view all the answers

What is the consequence of embrasures that are too large?

Little protection is provided to the supporting structures as food is forced into the interproximal space Signup and view all the answers

What is one of the problems of improper restoration?

Improper embrasure form Signup and view all the answers

What is the term used to describe the contact of teeth in opposing dental arches when the jaws are closed?

Occlusion Signup and view all the answers

What is the effect of the number and location of occlusal contacts between opposing teeth on muscle force?

It has important effects on the amount and direction of muscle force Signup and view all the answers

What is the term used to describe the blunt, rounded, or pointed projections of the crowns of teeth?

Cusps Signup and view all the answers

What separates the facial cusps from the lingual cusps?

Central groove Signup and view all the answers

What is the term used to describe the process of grinding and crushing food in the mouth?

Mastication Signup and view all the answers

What is the primary function of incisors during mastication?

Shearing or cutting through food Signup and view all the answers

Which of the following classes of teeth serve a dual role in mastication?

Premolars and molars Signup and view all the answers

What is the primary function of contours in relation to supporting tissues?

To protect and stimulate supporting tissues during mastication Signup and view all the answers

What is the primary determinant of muscle function in mastication?

Tooth form and its contour and contact relationships Signup and view all the answers

What is the role of molars in relation to the vertical dimension of the face?

To maintain the vertical dimension of the face Signup and view all the answers

What is the purpose of proximal contacts between teeth?

To stimulate supporting tissues during mastication Signup and view all the answers

What is the primary role of canines in occlusion?

To serve as guides in occlusion Signup and view all the answers

What is the relationship between occlusal surfaces and periodontal disease?

Occlusal surfaces can contribute to periodontal disease if not properly maintained Signup and view all the answers

What is the primary function of embrasures in relation to food?

To deflect food only to the extent that stimulates supporting tissues Signup and view all the answers

What is the primary role of tooth preparation and restoration in relation to tooth function?

To design and restore proper tooth form and function Signup and view all the answers

What is the position of the mandible called when teeth are brought into full interdigitation with the maximal number of teeth contacting?

Maximum intercuspation (MI) Signup and view all the answers

What type of cusps contact opposing teeth along the central fossa occlusal line?

Supporting cusps Signup and view all the answers

What is the purpose of non-supporting cusps?

To keep the soft tissue of the tongue and cheeks out from the occlusal tables Signup and view all the answers

What is the characteristic feature of supporting cusps according to the faciolingual center of the tooth?

They are closer to the faciolingual center of the tooth than non-supporting cusps Signup and view all the answers

What is the function of supporting cusps in mastication?

To prevent drifting and passive eruption of teeth Signup and view all the answers

What is the significance of the overlap of the cusps between posterior teeth?

It prevents self-injury during chewing Signup and view all the answers

What is the characteristic feature of non-supporting cusps compared to supporting cusps?

They have narrower, sharper cusp ridges Signup and view all the answers

What is the purpose of the depressions between the cusps?

To create fossae for occlusal contacts Signup and view all the answers

What is the characteristic feature of the maxillary arch compared to the mandibular arch?

It is larger than the mandibular arch Signup and view all the answers

What is the significance of the horizontal and vertical overlap of anterior teeth?

It can considerably influence mandibular movement and the cusp design of restorations of posterior teeth Signup and view all the answers