(E1) 7 - Eruptive Movements Part 2 - Tooth Exfoliation Flashcards
Exam 1 - BARRITT
Local factors impacting eruption
Systemic factors impacting eruption
What are the two broad classifications of eruptive disturbances?
Eruptive disturbances may be clinically classified based on:
1 - eruptive time
2 - eruptive position of tooth in arch
Define infra-occluded
Define submerged
Define Impacted
Define Embedded
Define ectopic eruption
Common Feature & Difference for mechanisms of eruption for deciduous and permanent teeth
Steps involved in eruption of permanent tooth: Step 1?
Steps involved in eruption of permanent tooth: Step 2?
What teeth form a gubernacular canal?
Anterior only (eruption canal)
Steps involved in eruption of permanent tooth: Step 3?
Premolar resorption begins __________ – premolar gradually moves ________
- inter-radicular between roots primary molar
- occlusally
Describe tooth resorption for permanent molar
Image: Summary of Eruption and Exfoliation
Exfoliation is controlled by_______ signals originating from the permanent tooth and ______ signals from the primary tooth. A primary tooth may exfoliate without successor but usually delayed. Several factors such as ______________ stimulate resorption
- extrinsic
- intrinsic
- apoptosis, and occlusal forces
Source of Intrinsic signals : Primary tooth
- pulp
- cementum
- dentin and PDL
Mechanism of action of intrinsic signals.
Programmed Cell Death - Parts and Outcome
Source of Extrinsic signaling : Originate from
Permanent tooth
- REE
- Dental follicle
Types of Signals released for extrinsic signaling and Outcome
Image Primary Dentition Chart
Image Permanent Dentition Chart
Exfoliation Features of Coronal Resportion of Alveolar Bone Crypt
Exfoliation Features of External Root Surface
Exfoliation Features of Internal Pulp Surface
What does the reversal line show?
Signs of repair in secondary cementum and PDL re-anchorage
What is Premature exfoliation?
A tooth may shed prematurely prior to normal age. Cause often due to external root resorption associated with trauma, infection, or impacted unerupted tooth.
What is Primary tooth retention?
Each deciduous tooth passes through a normal exfoliation (physiological resorption) process, but occasionally the deciduous tooth may be retained in its place beyond the normal time of exfoliation. Persistence of deciduous tooth may occur due to a variety of reasons.
