Questions and Answers
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.
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.
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.
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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?
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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?
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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.
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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.
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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.
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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.
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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?
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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.
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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 _______.
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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.
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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.
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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.
