Changes

==Introduction==

==Introduction==

[[Image:Gaboon Viper Skull.jpg|thumb|right|250px|Gaboon Viper - Copyright RVC]]

[[Image:Gaboon Viper Skull.jpg|thumb|right|250px|Gaboon Viper - Copyright RVC]]

Tooth development occurs in the following stages;  

Tooth development occurs in the following stages;  

1. Focal thickening of oral epithelium on the medial aspect of the [[Gingiva Introduction#Labiogingival groove|labiogingival groove]] forms the dental lamina.

1. Focal thickening of oral epithelium on the medial aspect of the [[Gingiva#Labiogingival groove|labiogingival groove]] forms the dental lamina.

2. The mesenchyme under each laminae condenses.

2. The mesenchyme under each laminae condenses.

7. Small mass of cells bud off the dental lamina forming the primordium of the permanent tooth which continues development.

7. Small mass of cells bud off the dental lamina forming the primordium of the permanent tooth which continues development.

8. The inner cell layer of enamel organ (from oral epithelium) differentiates into [[Ameloblasts|ameloblasts]].

8. The inner cell layer of enamel organ (from oral epithelium) differentiates into [[Tooth - Anatomy & Physiology#Ameloblasts|ameloblasts]].

9. Neighbouring cells in the dental papillae (from neural crest cells) differentiate into [[Odontoblasts - Anatomy & Physiology|odontoblasts]].

9. Neighbouring cells in the dental papillae (from neural crest cells) differentiate into [[Tooth - Anatomy & Physiology#Odontoblasts|odontoblasts]].

10. Dentine surrounds [[Pulp - Anatomy & Physiology|pulp]] to produce the [[Enamel Organ#Root|root]] of the tooth.

10. Dentine surrounds [[Tooth - Anatomy & Physiology#Pulp|pulp]] to produce the [[Tooth - Anatomy & Physiology#Root|root]] of the tooth.

11. Epithelial cells near the distal tooth form [[Cementoblasts - Anatomy & Physiology|cementoblasts]], secreting [[Enamel Organ#Cementum|cementum]] around the tooth [[Enamel Organ#Root|root]].

11. Epithelial cells near the distal tooth form [[Tooth - Anatomy & Physiology#Cementoblasts|cementoblasts]], secreting [[Tooth - Anatomy & Physiology#Cementum|cementum]] around the tooth [[Tooth - Anatomy & Physiology#Root|root]].

There is a reciprocal inductive interaction between the oral epithelium and mesenchyme precursors. The mesenchyme forms the tooth, it has labile differentiative properties but stable morphogenic properties. Tooth formation starts at the [[Enamel Organ#Crown|crown]] and progresses towards the [[Enamel Organ#Root|root]]. The tooth does not acquire full length until the crown has emerged. Tooth growth is appositional.

There is a reciprocal inductive interaction between the oral epithelium and mesenchyme precursors. The mesenchyme forms the tooth, it has labile differentiative properties but stable morphogenic properties. Tooth formation starts at the [[Tooth - Anatomy & Physiology#Crown|crown]] and progresses towards the [[Tooth - Anatomy & Physiology#Root|root]]. The tooth does not acquire full length until the crown has emerged. Tooth growth is appositional.

 

|flashcards= [[Teeth and Gingiva Flashcards]]

Eruption occurs after the [[Enamel Organ#Crown|crown]] has fully formed (prior to complete [[Enamel Organ#Root|root]] formation). It provides the space required for [[Enamel Organ#Root|root]] completion. The epithelial covering is continuous with gums after eruption. Erosion (wear) removes the epithelium. The 'toothless' gene stops eruption.

|powerpoints= [[Oral Cavity Histology resource|Histology of the oral cavity, see part 2 for developing teeth]]

 

[[Image:Tooth Radiograph.jpg|thumb|right|250px|Tooth Radiograph - Copyright Nottingham 2008]]

===Permanent Tooth===

 

 

 

Click here for the [[Oral Cavity - Anatomy & Physiology - Flashcards#Teeth & Gingiva Flashcards|teeth & gingiva flashcards]].

[[Category:Teeth - Anatomy & Physiology]]

[[Category:Teeth - Anatomy & Physiology]]