Podcast
Questions and Answers
What may a distal step terminal plane relationship indicate?
What may a distal step terminal plane relationship indicate?
- No impact on dental structure
- An increase in dental hygiene
- Deficiency in the development of the mandible (correct)
- A perfect Class I relationship
What are the effects of malocclusion? (Select all that apply)
What are the effects of malocclusion? (Select all that apply)
- Negative self-image (correct)
- Improved oral hygiene
- Increased risk for periodontal disease (correct)
- Possible TMJ pain (correct)
What is premature contact in dentistry?
What is premature contact in dentistry?
When one tooth hits before or more than any other.
What is anterior coupling?
What is anterior coupling?
What problems can occur with premature contact?
What problems can occur with premature contact?
What enables the primary teeth to take their position? (Select all that apply)
What enables the primary teeth to take their position? (Select all that apply)
What is the development of occlusion initiated by?
What is the development of occlusion initiated by?
What is alignment in dentistry?
What is alignment in dentistry?
What is intercuspation?
What is intercuspation?
At what age is the primary dentition usually completed?
At what age is the primary dentition usually completed?
The average overjet of primary dentition is?
The average overjet of primary dentition is?
The average overbite of primary dentition is?
The average overbite of primary dentition is?
What classification is used for primary occlusion?
What classification is used for primary occlusion?
What defines the terminal plane relationship?
What defines the terminal plane relationship?
What happens during the closing of the primary (primate) space?
What happens during the closing of the primary (primate) space?
What do primate spaces refer to?
What do primate spaces refer to?
What defines class I occlusion?
What defines class I occlusion?
Is it possible for both sides of the mandible to be in different classes?
Is it possible for both sides of the mandible to be in different classes?
How is horizontal overlap or overjet measured?
How is horizontal overlap or overjet measured?
What is the freeway space in dentistry?
What is the freeway space in dentistry?
In Angle's classification, what teeth are primarily used for assessment?
In Angle's classification, what teeth are primarily used for assessment?
What is defined as class II malocclusion?
What is defined as class II malocclusion?
What is class II Division 1 characterized by?
What is class II Division 1 characterized by?
What indicates a Class III malocclusion?
What indicates a Class III malocclusion?
The primary dentition erupt in a more upright position than permanent teeth.
The primary dentition erupt in a more upright position than permanent teeth.
What is defined as occlusion?
What is defined as occlusion?
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Study Notes
Occlusion and Angle's Classification
- Development of occlusion starts with primary teeth eruption influenced by tooth bud formation, eruption patterns, and facial development.
- Primary dentition typically completes by 2.5 years of age and erupts in a more upright position than permanent teeth.
- Average overjet of primary dentition is approximately 3mm, while the average overbite measures around 2.5mm.
Terminal Plane Relationship
- Primary occlusion is classified using Terminal Plane Relationship, based on the alignment of distal surfaces of maxillary and mandibular second molars.
- Types of Terminal Plane Relationships include:
- Mesial Step: Mandibular second molar is mesially positioned relative to the maxillary molar; most common scenario.
- Flush or Straight: Distal surfaces of both molars align evenly.
- Distal Step: Mandibular molar is positioned distally; least common.
Dental Spaces and Growth Factors
- During growth, jaws expand, leading to larger spaces between teeth despite teeth remaining the same size.
- Primate Spaces are larger spaces by canine areas, aiding in Class I occlusion.
- Leeway Spaces occur when wider primary molars are replaced by narrower premolars, contributing to space for proper dental alignment.
Factors Influencing Occlusion
- Occlusion can be influenced by jaw development, muscle activity, genetics, as well as habits like thumb sucking.
- Horizontal and vertical alignment are affected by the position of lips, cheeks, and tongue, as well as intercuspation.
Angles Classification and Occlusal Relationships
- Angle's Classification is the most recognized system for classifying occlusion, primarily involving permanent first molars.
- Patients can present differing angle classifications on each side of the mouth.
- Class I Occlusion: Mesiobuccal cusp of maxillary first molar aligns with the mesiobuccal groove of the mandibular first molar.
- Class II Malocclusion: Mandibular molar is positioned more posterior; includes two divisions:
- Division 1: Protruded maxillary incisors.
- Division 2: Inclined or retruded incisors.
- Class III Malocclusion: Mandible is protruded with a prognathic profile.
Anterior Occlusion Characteristics
- Overjet is the horizontal overlap of maxillary teeth over mandibular teeth.
- Overbite is the vertical overlap, categorized as slight, moderate, or severe, based on the vertical position of maxillary incisors in relation to mandibular incisors.
Facial Profiles and Dental Classification
- Facial profiles associated with the classifications include:
- Class I: Mesognathic profile, normal relationship between maxilla and mandible.
- Class II: Retrognathic profile; smaller mandible leads to facial recession.
- Class III: Prognathic profile, larger mandible compared to maxilla.
Malocclusion Effects
- Malocclusion can lead to negative self-image and complicate oral hygiene, increasing risk for periodontal disease and temporomandibular joint (TMJ) issues.
- Premature contacts refer to situations where one tooth hits before or harder than others, potentially leading to jaw misalignment and discomfort.
Important Curvature
- The Curve of Spee is a lateral curvature from anterior to posterior in the mandibular arch.
- Curve of Wilson describes the transverse occlusal curve for posterior teeth.
- Sphere of Monson is a three-dimensional curve combining the Curves of Spee and Wilson.
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