Podcast
Questions and Answers
What is the ideal relationship between the teeth and jaws, providing optimum form and function?
What is the ideal relationship between the teeth and jaws, providing optimum form and function?
Ideal occlusion
What is the classification that indicates the mesiobuccal cusp of the maxillary 1st molar should line up with the mesiobuccal groove of the mandibular 1st molar?
What is the classification that indicates the mesiobuccal cusp of the maxillary 1st molar should line up with the mesiobuccal groove of the mandibular 1st molar?
Class I
What is the term for bad occlusion or poor alignment?
What is the term for bad occlusion or poor alignment?
Malocclusion
Malocclusion can include dental malocclusions and skeletal malocclusions, or a combination of both (teeth and jaws)
Malocclusion can include dental malocclusions and skeletal malocclusions, or a combination of both (teeth and jaws)
Abnormalities in the size or arrangement of teeth can cause?
Abnormalities in the size or arrangement of teeth can cause?
What can result from abnormalities in the relative sizes of or alignment of the dental arches?
What can result from abnormalities in the relative sizes of or alignment of the dental arches?
What can different types of poor occlusal relationships acquired naturally or from incomplete orthodontic treatment result in?
What can different types of poor occlusal relationships acquired naturally or from incomplete orthodontic treatment result in?
Who originally classified the skeletal relationships between the maxillary and mandibular arches, and when?
Who originally classified the skeletal relationships between the maxillary and mandibular arches, and when?
Occlusal classifications are defined by describing the relationship between which teeth?
Occlusal classifications are defined by describing the relationship between which teeth?
If the maxillary and mandibular molars are missing, which teeth can alternatively be used to classify occlusion?
If the maxillary and mandibular molars are missing, which teeth can alternatively be used to classify occlusion?
What is the ideal skeletal relationship with no abnormal tooth alignment or discrepancies?
What is the ideal skeletal relationship with no abnormal tooth alignment or discrepancies?
Each Angle's classification is identified by how many factors?
Each Angle's classification is identified by how many factors?
What is the relationship between the mandibular and maxillary teeth in a Class I occlusion?
What is the relationship between the mandibular and maxillary teeth in a Class I occlusion?
What is the molar relationship in a Class I (ideal occlusion)?
What is the molar relationship in a Class I (ideal occlusion)?
What is the canine relationship in a Class I (ideal occlusion)?
What is the canine relationship in a Class I (ideal occlusion)?
What is the facial relationship in a Class I (ideal occlusion)?
What is the facial relationship in a Class I (ideal occlusion)?
What is the ideal anterior teeth relationship with a Class I (Ideal occlusion)?
What is the ideal anterior teeth relationship with a Class I (Ideal occlusion)?
Does Class I (ideal occlusion) have rotated teeth, abnormal spaces or crowding?
Does Class I (ideal occlusion) have rotated teeth, abnormal spaces or crowding?
With Class I Malocclusion (Neutrocclusion), what is the molar relationship?
With Class I Malocclusion (Neutrocclusion), what is the molar relationship?
With Class I Malocclusion (Neutrocclusion), what is the canine relationship?
With Class I Malocclusion (Neutrocclusion), what is the canine relationship?
Is the molar and canine relationship of the Class I Ideal occlusion & Class I Malocclusion (Neutrocclusion) the same?
Is the molar and canine relationship of the Class I Ideal occlusion & Class I Malocclusion (Neutrocclusion) the same?
What is the facial profile of a Class I malocclusion?
What is the facial profile of a Class I malocclusion?
What type of alignment discrepancies will be exhibited with a Class I malocclusion?
What type of alignment discrepancies will be exhibited with a Class I malocclusion?
Class II malocclusion is also known as?
Class II malocclusion is also known as?
With a Class II malocclusion, the mandible is in what relationship with the maxilla?
With a Class II malocclusion, the mandible is in what relationship with the maxilla?
What is the molar relationship of a Class II distocclusion?
What is the molar relationship of a Class II distocclusion?
What is the canine relationship of a Class II distocclusion?
What is the canine relationship of a Class II distocclusion?
There are ____ divisions of a Class II Distocclusion.
There are ____ divisions of a Class II Distocclusion.
Describe the characteristics of a Class II: Division I.
Describe the characteristics of a Class II: Division I.
Describe the characteristics of a Class II: Division II.
Describe the characteristics of a Class II: Division II.
What is the difference between Division I and II of Class II Distocclusion?
What is the difference between Division I and II of Class II Distocclusion?
What is the facial profile of a Class II?
What is the facial profile of a Class II?
Describe the mandible's relationship to the maxilla in a retrognathic profile.
Describe the mandible's relationship to the maxilla in a retrognathic profile.
With a Class II, due to discrepancies of teeth and maxillary dental protrusion, what may be required?
With a Class II, due to discrepancies of teeth and maxillary dental protrusion, what may be required?
With a Class II, in regards to the mandibular retrognathism, what may be going on with the mandible?
With a Class II, in regards to the mandibular retrognathism, what may be going on with the mandible?
Class II Dental malocclusion may be more difficult to treat due to the skeletal disharmony.
Class II Dental malocclusion may be more difficult to treat due to the skeletal disharmony.
Class III Mesiocclusion: the mandible is in a ____________ relationship to the maxilla.
Class III Mesiocclusion: the mandible is in a ____________ relationship to the maxilla.
In a Class III mesiocclusion, is the mandible retruded or protruded?
In a Class III mesiocclusion, is the mandible retruded or protruded?
What type of face shape is a Class III Mesiocclusion?
What type of face shape is a Class III Mesiocclusion?
With a Class III mesiocclusion, what is the molar relationship?
With a Class III mesiocclusion, what is the molar relationship?
What is the canine relationship in a Class III mesiocclusion?
What is the canine relationship in a Class III mesiocclusion?
What is the discrepancy of jaws where the lower jawbone has outgrown the upper jaw called?
What is the discrepancy of jaws where the lower jawbone has outgrown the upper jaw called?
What is the ideal facial relationship between maxillary and mandibular teeth?
What is the ideal facial relationship between maxillary and mandibular teeth?
When the mandibular teeth are facial to the maxillary teeth, usually due to a size discrepancy between maxillary and mandibular jaws, what is this condition called?
When the mandibular teeth are facial to the maxillary teeth, usually due to a size discrepancy between maxillary and mandibular jaws, what is this condition called?
A crossbite that occurs only on one side, may be a few teeth, may have a variety of causes, is referred to as?
A crossbite that occurs only on one side, may be a few teeth, may have a variety of causes, is referred to as?
Increased horizontal measure of bite between maxillary and mandibular incisors is called?
Increased horizontal measure of bite between maxillary and mandibular incisors is called?
Increased vertical measure of bite between maxillary and mandibular incisors is referred to as?
Increased vertical measure of bite between maxillary and mandibular incisors is referred to as?
What is the ideal range of overjet?
What is the ideal range of overjet?
How is overjet measured?
How is overjet measured?
Is it normal to have overjet?
Is it normal to have overjet?
What is the vertical distance by which the maxillary incisors vertically overlap the mandibular incisors called?
What is the vertical distance by which the maxillary incisors vertically overlap the mandibular incisors called?
What is the ideal range of overbite?
What is the ideal range of overbite?
Incisal edges of the maxillary teeth are within the incisal third of the facial surfaces of the mandibular teeth, is what level of overbite?
Incisal edges of the maxillary teeth are within the incisal third of the facial surfaces of the mandibular teeth, is what level of overbite?
Maxillary teeth are within the cervical third of the mandibular teeth, is what level of overbite?
Maxillary teeth are within the cervical third of the mandibular teeth, is what level of overbite?
Incisal surfaces of maxillary teeth occlude with incisal surfaces of mandibular teeth, there is no overlap. This is considered?
Incisal surfaces of maxillary teeth occlude with incisal surfaces of mandibular teeth, there is no overlap. This is considered?
Molars and premolars occlude in a cusp-to-cusp rather than in a cusp-to-groove relationship, this is considered?
Molars and premolars occlude in a cusp-to-cusp rather than in a cusp-to-groove relationship, this is considered?
Tooth has assumed a position labial to normal is called?
Tooth has assumed a position labial to normal is called?
Tooth is positioned buccal to normal is referred to as?
Tooth is positioned buccal to normal is referred to as?
Tooth is positioned lingual to normal is called?
Tooth is positioned lingual to normal is called?
Tooth is elongated (positioned) beyond the line of occlusion is known as?
Tooth is elongated (positioned) beyond the line of occlusion is known as?
Tooth is depressed below (short of) the line of occlusion is referred to as?
Tooth is depressed below (short of) the line of occlusion is referred to as?
Tooth is twisted (turned) or rotated in its position is called?
Tooth is twisted (turned) or rotated in its position is called?
Tooth is tipped mesially is known as?
Tooth is tipped mesially is known as?
Tooth is tipped distally is referred to as?
Tooth is tipped distally is referred to as?
A tooth that erupts outside its normal position within the arch, commonly a maxillary canine, is called?
A tooth that erupts outside its normal position within the arch, commonly a maxillary canine, is called?
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Study Notes
Ideal Occlusion
- Defined as the optimal relationship between teeth and jaws, ensuring maximum function and aesthetic form.
Types of Occlusion
- Class I (Ideal Occlusion): Mesiobuccal cusp of maxillary first molar aligns with the mesiobuccal groove of the mandibular first molar.
- Class I Malocclusion (Neutrocclusion): Same molar and canine relationship as Class I, but misalignment or discrepancies present.
- Class II Malocclusion (Distocclusion): Mandible positioned distally to the maxilla. Molar relationship involves the maxillary first molar occluding between the space of the mandibular second premolar and first molar.
- Class III Malocclusion (Mesiocclusion): Mandible is positioned mesially to the maxilla, resulting in a protruded jaw relationship.
Malocclusion
- Malocclusion Types: Includes both dental and skeletal malocclusions, often resulting from mismatches in tooth size/arrangement or jaw alignment.
- Common Causes: Misalignment can arise from crowding, spacing, or incomplete orthodontic interventions.
Classification System
- Angle’s classification established by Dr. Edward Angle in 1887, based on the skeletal relations of maxillary and mandibular arches.
- Occlusal classifications use the first permanent molars to define relationships, but canines may be used if molars are absent.
Class II Malocclusion Divisions
- Division I: All anterior teeth protruded, labioverted maxillary incisors ("buck teeth").
- Division II: Lateral incisors tipped labially/mesially, central incisors are retruded.
Facial Profiles
- Class I: Mesognathic profile.
- Class II: Retrognathic profile; mandible is retruded relative to the maxilla.
- Class III: Prognathic profile; mandible protruded.
Measurements of Occlusion
- Overjet: Horizontal measurement between labial surfaces of mandibular incisors and lingual surfaces of maxillary incisors, considered normal at 2-3 mm.
- Overbite: Vertical overlap of maxillary incisors over mandibular incisors, ideally 2-3 mm.
- Levels of Overbite:
- Moderate: Maxillary incisors within the incisal third of mandibular teeth.
- Severe: Maxillary teeth within the cervical third of mandibular teeth.
Common Terminology
- Open Bite: No contact between anterior teeth; can be anterior or posterior.
- Crossbite: When mandibular teeth are more facial than maxillary teeth, can be bilateral or unilateral.
Tooth Positioning
- Labioversion: Labial position beyond normal.
- Buccalversion: Positioned buccally to normal.
- Linguoversion: Positioned lingually to normal.
- Supraversion: Elongated beyond the occlusal line (hypereruption).
- Infraversion: Depressed below the occlusal line.
- Torsoversion: Twisted or rotated.
- Mesioversion & Distoversion: Tipped mesially or distally, respectively.
- Ectopic eruption: Tooth erupts outside normal position, often requiring orthodontic treatment if untreated.
Additional Facts
- Class II requires potential tooth removal or growth guidance for retrognathic profiles.
- Skeletal discrepancies may complicate treatment in malocclusions.
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