Podcast
Questions and Answers
You must know the normal and the normal variation so you can identify any deviation and pinpoint the problem.
You must know the normal and the normal variation so you can identify any deviation and pinpoint the problem.
True
In class 1 occlusion, the ________ cusp of the maxillary first molar is aligned with the ________ of the mandibular first molar.
In class 1 occlusion, the ________ cusp of the maxillary first molar is aligned with the ________ of the mandibular first molar.
mesio buccal cusp of max 1st is aligned with buccal groove of mandibular first molar
In normal occlusion, there is a smooth curve passing through, on the upper arch: - __________ of molars/PM - _______ of canine and incisors.
In normal occlusion, there is a smooth curve passing through, on the upper arch: - __________ of molars/PM - _______ of canine and incisors.
central fossa of molars/PM, cingulum of canine/incisors
In normal occlusion, there is a smooth curve passing through the lower arch: -_________ of molars/premolars - __________ of anterior teeth.
In normal occlusion, there is a smooth curve passing through the lower arch: -_________ of molars/premolars - __________ of anterior teeth.
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Malocclusion is defined in 3 planes of space; which is not one of those planes?
Malocclusion is defined in 3 planes of space; which is not one of those planes?
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Malocclusion is defined in 3 planes of space; there is an implied 4th plane, what is it?
Malocclusion is defined in 3 planes of space; there is an implied 4th plane, what is it?
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Which match of occlusion/prevalence is incorrect?
Which match of occlusion/prevalence is incorrect?
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What is the degree of vertical overlap of the mandibular incisors by the maxillary incisors when the posterior teeth are in occlusion?
What is the degree of vertical overlap of the mandibular incisors by the maxillary incisors when the posterior teeth are in occlusion?
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In normal occlusion, there is a slight scissor bite, where the upper arch is slightly larger than lower.
In normal occlusion, there is a slight scissor bite, where the upper arch is slightly larger than lower.
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Place the maxillary permanent teeth in order of eruption: - CI - LI - canine - first premolar - second premolar - first molar - second molar.
Place the maxillary permanent teeth in order of eruption: - CI - LI - canine - first premolar - second premolar - first molar - second molar.
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Place the mandibular permanent teeth in order of eruption: - CI - LI - canine - first premolar - second premolar - first molar - second molar.
Place the mandibular permanent teeth in order of eruption: - CI - LI - canine - first premolar - second premolar - first molar - second molar.
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Lower teeth erupt before upper teeth.
Lower teeth erupt before upper teeth.
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What is the dental age of the patient in the image?
What is the dental age of the patient in the image?
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Malocclusion, specifically _________, has been linked to decreased oral hygiene, dental plaque accumulation, progression of carious lesions and periodontal disease.
Malocclusion, specifically _________, has been linked to decreased oral hygiene, dental plaque accumulation, progression of carious lesions and periodontal disease.
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Certain occlusal traits such as the ________ ________ can cause trauma to the palatal mucosa.
Certain occlusal traits such as the ________ ________ can cause trauma to the palatal mucosa.
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Some anomalies such as palatally impacted canines may result in damage of surrounding roots and may incite _______ formation.
Some anomalies such as palatally impacted canines may result in damage of surrounding roots and may incite _______ formation.
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An anterior crossbite or anterior open bite can make _______ certain foods almost impossible.
An anterior crossbite or anterior open bite can make _______ certain foods almost impossible.
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Which of the following is not a consequence of an anterior open bite?
Which of the following is not a consequence of an anterior open bite?
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Children with an overjet of _______ mm are _____x as much at risk of injury to their anterior teeth.
Children with an overjet of _______ mm are _____x as much at risk of injury to their anterior teeth.
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Teasing occurs _____X more for children with a visible malocclusion.
Teasing occurs _____X more for children with a visible malocclusion.
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Which is a cause of class 1 malocclusion?
Which is a cause of class 1 malocclusion?
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Developmental problem resulting in malocclusion: 1. problem with tooth ________ 2. problem with tooth _______.
Developmental problem resulting in malocclusion: 1. problem with tooth ________ 2. problem with tooth _______.
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This is a rare genetic disorder which represents the congenital absence of more than 6 teeth in the primary, permanent, or both dentitions.
This is a rare genetic disorder which represents the congenital absence of more than 6 teeth in the primary, permanent, or both dentitions.
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When a primary tooth is missing, the successor is always missing.
When a primary tooth is missing, the successor is always missing.
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Study Notes
Malocclusion Basics
- Knowledge of normal occlusion and variations is crucial for identifying deviations.
- Class 1 occlusion features the mesio buccal cusp of the maxillary first molar aligned with the buccal groove of the mandibular first molar.
Normal Occlusion Characteristics
- In normal occlusion, a smooth curve passes through the central fossa of molars/premolars and the cingulum of canines/incisors in the upper arch.
- For the lower arch, the curve passes through the buccal cusp of molars/premolars and the incisal edges of anterior teeth.
Malocclusion Classification
- Malocclusion is defined in three planes: sagittal, vertical, and an implied fourth plane of time.
- The horizontal plane is not recognized in standard classifications of malocclusion.
- Normal occlusion prevalence is approximately 30%, contrary to the commonly stated 10%.
Overbite and Occlusal Traits
- Overbite denotes the degree of vertical overlap of mandibular incisors by maxillary incisors.
- Normal occlusion features well-coordinated upper and lower arches, opposed to a scissor bite.
Eruption Timelines
- Maxillary teeth erupt in the following order: first molar (6-7 years), central incisor (7-8 years), lateral incisor (8-9 years), first premolar (10-11 years), second premolar (10-12 years), canine (11-12 years), second molar (12-13 years).
- Mandibular teeth erupt: first molar (6-7 years), central incisor (6-7 years), lateral incisor (7-8 years), canine (9-10 years), first premolar (10-12 years), second premolar (11-12 years), second molar (11-13 years).
- Generally, lower teeth erupt before upper teeth, with the dental age for mixed dentition around 7-8 years.
Impacts of Malocclusion
- Crowding in the dental arch is linked to poor oral hygiene and increases the risk of dental issues.
- Impinging overbite may damage the palatal mucosa.
- Anterior cross bites or open bites hinder the ability to incise certain foods; however, cyst formation is not a typical consequence of anterior open bites.
- Children with an overjet greater than 3mm are twice as likely to injure their anterior teeth, and teasing occurs seven times more frequently due to visible malocclusion.
Causes of Class 1 Malocclusion
- Class 1 malocclusion can arise from spatial, environmental, or developmental issues.
- Developmental problems may involve tooth number anomalies (congenitally missing or supernumerary teeth) and positioning issues (ectopic eruption).
- Oligodontia describes a rare genetic condition resulting in the absence of six or more teeth in primary or permanent dentition.
- If a primary tooth is missing, its successor is typically absent as well.
Studying That Suits You
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Description
Test your knowledge on Class 1 malocclusion concepts with these flashcards. Learn about normal variations, occlusion alignment, and more. Perfect for dental students or anyone interested in orthodontics.
