Podcast
Questions and Answers
In which position is the highest portion of the impacted molar below the occlusal line but above the cervical line of the second molar?
In which position is the highest portion of the impacted molar below the occlusal line but above the cervical line of the second molar?
Which position has the lowest portion of the crown of the impacted molar between the occlusal line and cervical line of the second molar?
Which position has the lowest portion of the crown of the impacted molar between the occlusal line and cervical line of the second molar?
Relative to the position of the long axis of the impacted mandibular 3rd molar with the 2nd molar, which position is considered inverted?
Relative to the position of the long axis of the impacted mandibular 3rd molar with the 2nd molar, which position is considered inverted?
What is the classification when there is no bone or a very thin partition between the maxillary 3rd molar and maxillary sinus?
What is the classification when there is no bone or a very thin partition between the maxillary 3rd molar and maxillary sinus?
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Which classification involves an impacted maxillary canine that is semi-vertical?
Which classification involves an impacted maxillary canine that is semi-vertical?
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When referring to the impacted maxillary 3rd molars, what does Position C indicate?
When referring to the impacted maxillary 3rd molars, what does Position C indicate?
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What is the main characteristic of embedded teeth?
What is the main characteristic of embedded teeth?
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Which factor can lead to the impaction of mandibular 3rd molars?
Which factor can lead to the impaction of mandibular 3rd molars?
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What defines Class II impacted mandibular 3rd molars?
What defines Class II impacted mandibular 3rd molars?
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Which teeth have a high frequency of impaction, according to the text?
Which teeth have a high frequency of impaction, according to the text?
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What characterizes Class I impacted mandibular 3rd molars?
What characterizes Class I impacted mandibular 3rd molars?
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In what position are Class III impacted mandibular 3rd molars located?
In what position are Class III impacted mandibular 3rd molars located?
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Study Notes
Molar Impaction Positions
- The highest portion of the impacted molar is found below the occlusal line but above the cervical line of the second molar.
- The lowest portion of the crown of the impacted molar is located between the occlusal line and cervical line of the second molar.
Long Axis Relationships
- An inverted position of the impacted mandibular third molar is determined relative to the long axis of the second molar.
Classification of Impactions
- The classification for impacted maxillary third molars with no bone or a very thin partition between the maxillary sinus is known as "Class A" impaction.
- An impacted maxillary canine that is semi-vertical falls under "Class II" impaction.
Positions and Characteristics
- Position C for impacted maxillary third molars indicates a specific location relevant to the adjacent anatomical structures.
- Embedded teeth are characterized mainly by their complete encapsulation in bone without any eruption.
Factors and Frequency
- Factors leading to mandibular third molar impaction include lack of space due to jaw size and alignment issues.
- Mandibular third molars have a high frequency of impaction, particularly those that are vertically aligned.
Classifications of Mandibular Third Molars
- Class II impacted mandibular third molars are defined by their position, typically where the long axis of the tooth is angled with respect to the second molar.
- Class I impacted mandibular third molars are characterized by their position being more favorable for extraction, usually mesioangular.
- Class III impacted mandibular third molars are located in a more difficult position, often distoangular, making surgical access more challenging.
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Description
Explore the causes and classifications of impaction in teeth, including unerupted individual teeth and obstruction by physical barriers. Learn about the impact of lack of space due to teeth crowding and rotation of the tooth bud on impacted teeth.
