Changes

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

11. Epithelial cells near the distal tooth form [[Cementoblasts - Anatomy & Physiology|cementoblasts]], secreting [[Cementum - Anatomy & Physiology|cementum]] around the tooth [[Root - Anatomy & Physiology|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 stabile morphogenic properties. Tooth formation starts at the [[Crown|crown]] and progresses towards the [[Root - Anatomy & Physiology|root]]. The tooth does not aquire full length until the [[Crown|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 [[Crown|crown]] and progresses towards the [[Root - Anatomy & Physiology|root]]. The tooth does not acquire full length until the crown has emerged. Tooth growth is appositional.

==Eruption==

==Eruption==

===Deciduous Tooth===

===Deciduous Tooth===

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

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

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

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

===Permanent Tooth===

===Permanent Tooth===

The tooth migrates into the socket of the deciduous tooth on the lingual side. It increases the pressure on the deciduous tooth by increased growth. Resorption of the deciduous tooth root leads to loosening of the deciduous tooth. There is then shedding of the deciduous tooth and the permanent tooth replaces the deciduous tooth. Premature loss of the deciduous tooth leads to disorganised (non-occluding) permanent teeth.

The tooth migrates into the socket of the deciduous tooth on the lingual side. It increases the pressure on the deciduous tooth by increased growth. Resorption of the deciduous tooth root leads to its loosening. The deciduous tooth then sheds and the permanent tooth replaces it. Premature loss of the deciduous tooth leads to disorganised (non-occluding) permanent teeth.

==Links==

==Links==

[[Category:Teeth - Anatomy & Physiology]]

[[Category:Teeth - Anatomy & Physiology]]

[[Category:To Do - AimeeHicks]][[Category:To Do - Review]]

[[Category:A&P Done]]