Questions and Answers
You must know the normal and the normal variation so you can identify any deviation and pinpoint the problem.
True
Based on the following observations, determine the status: 5yr with primary dentition and spacing.
Based on the provided descriptions, classify the dental observations.
The relationship between the upper and lower teeth is defined as ______ and ______.
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Class ___ Occlusion: Mesio-buccal cusp of maxillary first molar is aligned with buccal groove of mandibular first molar.
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The two components of normal occlusion are the relationship between the upper and lower teeth and the ______ passing through upper and lower arch.
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What is class 1 malocclusion?
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What is the percentage of normal occlusion?
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What is the percentage of class 1 malocclusion?
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_____ 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 a normal occlusion, the upper and lower arches should fit and interlock.
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Crossbite is characterized by what?
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What are the three components of malocclusion?
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What does it mean if teeth were lost after trauma?
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Abnormal labial frenum does not prevent orthodontic space closure.
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What is the most common environmental habit causing malocclusion?
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Study Notes
Malocclusion Overview
- Understanding normal occlusion and its variations is crucial for identifying deviations and diagnosing issues.
- Malocclusion can be classified as no problem (normal), potential problem (needs monitoring), or actual problem (requires treatment).
Occlusion Definition
- Occlusion refers to the upper and lower teeth's relationship during rest and function.
- Class 1 Occlusion features the mesio-buccal cusp of the maxillary first molar aligning with the buccal groove of the mandibular first molar.
Components of Normal Occlusion
- Two main components include the relationship between upper and lower teeth and a curve passing through both arches.
- The upper arch curve includes the central fossa of molars and premolars, while the lower arch comprises buccal cusps of molars and incisal edges of anterior teeth.
Malocclusion Classification
- Malocclusion is evaluated in three spatial planes: sagittal, vertical, and transverse, as well as time (dental age/growth).
- Class 1 malocclusion involves normal jaw proportions but misalignment of one or more teeth.
Prevalence of Occlusion Types
- Normal occlusion: 30%
- Class 1 malocclusion: 50-55%
- Class 2 malocclusion: 15%
- Class 3 malocclusion: 1%
Vertically and Functionally Related Concepts
- Overbite (deep bite) measures vertical overlap of mandibular incisors by maxillary incisors.
- Normal occlusion achieves a zipper-like interlocking fit between upper and lower arches.
Comparing Bite Types
- Crossbite indicates a narrow maxillary arch, while scissor bite reflects a wider maxillary arch.
- Malocclusion impacts periodontal health, oral health, function and TMJ, dental injury risk, and psychosocial well-being.
Effects and Causes of Malocclusion
- Crowded teeth correlate with poorer oral hygiene and increased dental issues.
- Traumatic events, developmental anomalies, and spatial concerns cause this condition.
Tooth Number and Eruption Considerations
- Congenitally missing or supernumerary teeth can lead to developmental problems.
- Monitoring dental age and eruption patterns is key for treatment planning.
Environmental Factors
- Trauma and habits, such as thumb sucking, can lead to malocclusion.
- Thumb sucking affects occlusion based on the habit's duration, frequency, and intensity.
Spacing and Crowding in Dentition
- Spaced deciduous dentition promotes proper permanent dentition development.
- Lack of spacing indicates jaw-tooth size disproportion.
Growth Monitoring and Treatment Approaches
- Arch length deficiency (ALD) arises when required space exceeds available space.
- Treatment includes various strategies to create space, such as distalizing teeth, expansion, or extraction.
Final Notes on Management
- Primary teeth serve as important space maintainers; early loss can lead to crowding if not managed properly.
- Referral to an orthodontist is recommended during late mixed dentition for optimal treatment.
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Description
Test your knowledge of Class 1 malocclusions with these flashcards. Learn to identify normal variations and potential problems through images and definitions. Enhance your understanding of dental occlusion and improve your diagnostic skills.
