Tooth Eruption and TMJ Flashcards
Deciduous tooth eruption proceeds ______ to _____ in both the maxilla and mandible with mandibular teeth erupting _______
medial to lateral
slightly earlier than their complementary maxillary teeth
AKA. Mandibular CI’s erupt around 6-10 months while maxillary CI’s erupt around 8-12 months
Permanent tooth eruptions proceeds in the __________ after __________ teeth have been shed.
medial to lateral,
Deciduous
Is early tooth interruption common?
NO
But it can be followed by early eruption of permanent teeth
Is late tooth interruption common?
What is it caused by?
Yes
Nutritional deficiencies
Genetics
Metabolic Deficiencies
What is tooth impaction?
Teeth will be structurally apt but do not erupt at the occlusal surface and cause misalignment.
Very common for wisdom teeth
During which stage of tooth development does alveolar bone development occur?
Apposition stage
Permanent dentition develops from the __________ except for which teeth?
Succedaneous bud
All ADULT molars
The succedaneous bud is found _______.
Lingually
The jaw continues to grow in size until age of ______.
20
Maxillary molars are faced _______ until there is enough room for them to move.
Mandibular molars are faced _______ until there is enough room for them to move.
Max- distally
Man- Mesially
What are the 3 stages of tooth eruption?
- Pre-eruptive where there are changes in location of the tooth.
- Eruptive stage which is reflective of the movement of the tooth as it changes position in the jaw to reach the occlusal plane.
- Posteruptive stage where changes in positioning occur of the tooth as the jaw grown and teeth are being used
What are the two ways teeth move in the pre-eruptive stage of tooth eruption ?
- Bodily Movement
Shift in location of ENTIRE tooth germ within developing jaw
- Eccentric Growth
Relative growth of one part of a tooth in relation to the rest of the tooth causing a different center of gravity for the tooth
Describe differences in bodily movement between canines and incisors compared to molars and premolar.
Canines and incisors will have the permanent dentition located laterally and lingually to the primary tooth. They scootch into the spot once the primary tooth false out.
Molars and premolar tooth germs will find their way UNDER the primary tooth. Once the primary tooth falls out, it will follow the path of eruption and just replace the spot.
What exactly happens in eccentric movement during the pre-eruptive phase?
Root elongates and center of gravity changes.
Deciduous dentition has premolars. True or false
FALSE
Permanent premolars erupt ________ what tooth of primary dentition?
under
Primary molars. Root will be resorbed of the primary molar.
What lays the path for interruption of permanent teeth including molars ?
The Gubernacular Cord and Canal
When the dental lamina undergoes a ptosis, it’s remnants, or organized in the form of epithelial eyelids and strands, that lineup, leaving the reduced epithelium of the enamel organ towards the oral mucosa.
The cord itself is composed by a fibrous conjunctive tissue containing peripheral nerves, blood and lymphatic vessels.
The Gubernacular Cord establishes a ____________ where _______ cannot populate.
space in jaw where alveolar bone cannot populate
What are Gubernacular canals?
Gubernacular canals are structures formed due to the gubernacular cord stopping bone from populating in certain areas of the jaw.
These canals are the site of permanent tooth eruption and the primary dentition is shed!
Gubernacular canals are only for what kind of teeth?
Teeth that develop from the succedaneous bud.
So ALL permanent dentition EXCEPT molars which bud like a regular primary tooth.
Describe how gubernacular canals direct tooth development
The gubernacular chord travels through the gubernacular, canals, and teeth follow.
Osteoclast activity driven by components of the cord allow the canal to widen so that the tooth can erupt
What is the Gubernacular cord connect?
Dental follicle of succedaneous tooth ( the periodontum producing cells) to the oral mucosa.