Dental Anatomy Chapter 9 - Exam Questions & Verified Answers
Ideal occlusion harmonious static and dynamic relationship of teeth and jaws.
malocclusion - "bad" occlusion, deviation from the ideal.
- can be due to an improper alignment of teeth within an arch or a lack of harmony
between the size and shape of the jaws.
Jaw relationship bone-to-bone position of the mandible relative to the maxillae not influenced by the
teeth touching. also called maxillomandibular relationship
Dr. Edward Angle defined 3 jaw relationships
What are the 3 jaw relationships 1. Class 1 occlusion
2. Class 2 occlusion
3. Class 3 occlusion
Class 1: - An ideal or normal front-to-back (anteroposterior) relationship.
- Also called Neutroclusion or normal occlusion.
Each class of occlusion is defined by the relationship of Maxillary and mandibular first molars
the first teeth to erupt in the adult dentition:
If the first molars are absent then the relationship between Maxillary and mandibular canines
which teeth defines occlusion?
What determines ideal occlusion? - the mesiobuccal cusp of the maxillary first molar is aligned with the mesiobuccal
groove on the mandibular first molar.
- the maxillary canine fits into the facial embrasure between the mandibular canine
and mandibular 1st premolar.
Approximately what percentage of the population are class 72%
1?
Class 1: Facial profile Orthognathic
Orthognathic rather straight line from the top half of the face to the anterior border of the mandible
(chin)
"gnathic" pertains to the jaw
"ortho" pertains to straight or normal jaw profile
Another name for orthognathic mesognathic
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, Dental Anatomy Chapter 9 - Exam Questions & Verified Answers
mesognathic - characterized by the position of the resting mandible relative to the maxillae.
- no obvious protrusion and no obvious retrusion
protrusion lower jaw is positioned anteriorly to the normal
retrusion lower jaw is positioned posteriorly to the normal
Normal horizontal overlap incisal edges of maxillary incisors are labial to edges of mandibular incisors.
What is another name for "normal horizontal overlap"? normal overjet
Normal vertical overlap When viewed facially, a small portion of the incisal edges of mandibular incisors are
hidden from view by overlapping maxillary incisors.
What is another name for "normal vertical overlap"? Normal overbite
In ideal occlusion, what is the position of the maxillary buccal cusps and buccal surfaces of the maxillary posterior teeth are buccal to
posterior teeth? those in the mandibular arch.
In ideal occlusion what is the position of the mandibular lingual cusps and lingual surfaces of the mandibular posterior teeth are lingual to
posterior teeth? those in the maxillary arch.
Where do the lingual cusps of the maxillary posterior teeth in occlusal fossae of the mandibular teeth
rest in ideal occlusion?
Where do the buccal cusps of the mandibular posterior in the occlusal fossae of maxillary teeth
teeth rest in ideal occlusion?
Why is the vertical long axis midline of each maxillary tooth due in part to the wider maxillary incisor teeth.
positioned slightly distal to the vertical axis of the
corresponding mandibular tooth?
In which jaw relationships can dental malocclusions occur? Class 1, 2, and 3
When does malocclusion occur? When individual teeth or groups of teeth within an arch are not aligned to fit into an
ideal parabolic arch form and/or do not form a level occlusal plane
labioversion tooth that is positioned labially relative to the ideal parabolic arch form of other teeth
(anterior teeth)
Stuvia 2026-2027 | Latest Version
Ideal occlusion harmonious static and dynamic relationship of teeth and jaws.
malocclusion - "bad" occlusion, deviation from the ideal.
- can be due to an improper alignment of teeth within an arch or a lack of harmony
between the size and shape of the jaws.
Jaw relationship bone-to-bone position of the mandible relative to the maxillae not influenced by the
teeth touching. also called maxillomandibular relationship
Dr. Edward Angle defined 3 jaw relationships
What are the 3 jaw relationships 1. Class 1 occlusion
2. Class 2 occlusion
3. Class 3 occlusion
Class 1: - An ideal or normal front-to-back (anteroposterior) relationship.
- Also called Neutroclusion or normal occlusion.
Each class of occlusion is defined by the relationship of Maxillary and mandibular first molars
the first teeth to erupt in the adult dentition:
If the first molars are absent then the relationship between Maxillary and mandibular canines
which teeth defines occlusion?
What determines ideal occlusion? - the mesiobuccal cusp of the maxillary first molar is aligned with the mesiobuccal
groove on the mandibular first molar.
- the maxillary canine fits into the facial embrasure between the mandibular canine
and mandibular 1st premolar.
Approximately what percentage of the population are class 72%
1?
Class 1: Facial profile Orthognathic
Orthognathic rather straight line from the top half of the face to the anterior border of the mandible
(chin)
"gnathic" pertains to the jaw
"ortho" pertains to straight or normal jaw profile
Another name for orthognathic mesognathic
Stuvia 2026-2027 | Latest Version
, Dental Anatomy Chapter 9 - Exam Questions & Verified Answers
mesognathic - characterized by the position of the resting mandible relative to the maxillae.
- no obvious protrusion and no obvious retrusion
protrusion lower jaw is positioned anteriorly to the normal
retrusion lower jaw is positioned posteriorly to the normal
Normal horizontal overlap incisal edges of maxillary incisors are labial to edges of mandibular incisors.
What is another name for "normal horizontal overlap"? normal overjet
Normal vertical overlap When viewed facially, a small portion of the incisal edges of mandibular incisors are
hidden from view by overlapping maxillary incisors.
What is another name for "normal vertical overlap"? Normal overbite
In ideal occlusion, what is the position of the maxillary buccal cusps and buccal surfaces of the maxillary posterior teeth are buccal to
posterior teeth? those in the mandibular arch.
In ideal occlusion what is the position of the mandibular lingual cusps and lingual surfaces of the mandibular posterior teeth are lingual to
posterior teeth? those in the maxillary arch.
Where do the lingual cusps of the maxillary posterior teeth in occlusal fossae of the mandibular teeth
rest in ideal occlusion?
Where do the buccal cusps of the mandibular posterior in the occlusal fossae of maxillary teeth
teeth rest in ideal occlusion?
Why is the vertical long axis midline of each maxillary tooth due in part to the wider maxillary incisor teeth.
positioned slightly distal to the vertical axis of the
corresponding mandibular tooth?
In which jaw relationships can dental malocclusions occur? Class 1, 2, and 3
When does malocclusion occur? When individual teeth or groups of teeth within an arch are not aligned to fit into an
ideal parabolic arch form and/or do not form a level occlusal plane
labioversion tooth that is positioned labially relative to the ideal parabolic arch form of other teeth
(anterior teeth)
Stuvia 2026-2027 | Latest Version
