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BOB TOPIC 2 - Angeline Ardythe Katarina Rajagukguk - 2506553534 - Coggle…
BOB TOPIC 2 - Angeline Ardythe Katarina Rajagukguk - 2506553534
Time + stages of development of the dental seed
Initiation → week 6–7
Bud → week 8
Cap → week 9–10
Bell → week 11–12
Apposition → prenatal
Maturation → prenatal → postnatal
Initial process of initiating dental seed formation
Oral epithelium (ectoderm) → thickens into dental lamina
Ectomesenchyme (neural crest) → interacts with epithelium
Reciprocal induction between ectoderm + ectomesenchyme
Dental lamina forms tooth buds
Starts week 6–7
Embryological origin of each part of the tooth seed
Enamel organ → oral epithelium (ectoderm)
Dental papilla → neural crest ectomesenchyme
Dental follicle/sac → ectomesenchyme around papilla
Stages of amelogenesis & dentinogenesis (crown morphogenesis)
Amelogenesis
Presecretory → morphogenetic + differentiation
Secretory → Tomes’ process forms rods + interrods
Maturation → enamel mineralization
Dentinogenesis
Odontoblasts (from papilla) form predentin → dentin
Happens slightly before amelogenesis
Stages of root growth + tissues supporting teeth
Cementogenesis
Cementoblasts from follicle form cementum
Supporting tissues
Cementum → anchors PDL
PDL → support + sensory
Alveolar bone → socket + remodeling
Gingiva → protective seal
Root growth
HERS determines root length + shape
HERS induces odontoblasts → root dentin
HERS disintegrates → allows root elongation
Process of tooth eruption
Pre-eruptive → tooth shifts in jaw during growth
Eruptive → root elongation + bone remodeling; PDL forms
Post-eruptive → adjustments during jaw growth; root completes
Mechanisms
Root elongation
Bone remodeling
Dental follicle signaling
PDL traction