INTERCEPTIVE ORTHODONTICS- DR NATASHA UNANI
source – don’t remember, had written it a lot time ago
Based on morphological alphabetical description of shape – 4 types:
Note: Pit & fissure with high steep walls & narrow bases are more prone to caries.(Developmental faults)
Occlusal fissures: Deep invagination of enamel, described as broad/narrow funnels, constricted hour glasses, multiple invaginations with inverted Y-shaped divisions & irregularly shaped.
Deep and narrow Pit & Fissure
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Retention of food debris & microbes
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Fermentation of food by microbes
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Formation of Acid
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Caries
➡️ The lesions develops from attack on their walls.
- Cross section: Inverted “V” (A narrow entrance & wider involvement closer to DEJ)
- Therefore, Greater no. of Dentinal Tubules are involved.
- Early dentin involvement – When enamel at bottom of Pit & fissure is thin.
Caries when occur at Pit & Fissure follow direction of ENAMEL RODS
ENAMEL LAMELLAE – Initiation of Caries
The Initial Carious lesion of Enamel:-
• Clinical View:
- Visual Changes – Chalkiness, yellow/brown/black discoloration.
- Soft & ‘catch’ a fine explorer point.
- Enamel bordering them is opaque bluish white & undermined ➡️ Lateral spread of caries at DEJ
- Sign on stained tooth (Brown P/F)
- Newly erupted teeth – underlying decay; Older: Arrested lesion
References: Wheeler’s Textbook, Google images
SOURCE – RAMYA RAGHU TEXTBOOK