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1. Primary dentition/ Temporary dentition

2. Secondary dentition/ Permanent dentition

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- Physiologic process resulting in elimination ofdeciduous dentition

- Result of progressive resorption of the roots ofteeth and supporting tissues – the periodontalligament

- Not alays continuous! having a period of restand repair "ut resorption predominates repair 

- The pressure generated by the growing anderupting permanent tooth dictates the patternof shedding

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- #ictated "y the pressure generated "y thegroing and erupting permanent tooth

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- Pressure directed against the root surface of thedeciduous tooth

- Physiologic movement is in occlusal andvestibular direction

- Resorption "egins on the lingual surface

- Permanent tooth occupies position directlyapical to deciduous tooth $e%cept mandi"ularincisors&

- Temporary tooth shed "efore root resorption iscomplete

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- Resorption "egins at the inner surfaces 

- #eveloping "icuspids are "eteen roots of

deciduous molars- Apical positioning or the permanent "icuspidsa result of a continuous groth of 'as andocclusal movement of temporary molars

- Temporary molars( root are completely resor"edand cron is partially resor"ed "efore e%foliation

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Odontoclasts- )ells responsi"le for removal of dental hard tissue

- *as a"ility to resor" all dental hard tissue includingenamel

- Similar in structure to osteoclast $multinucleated cells!occupy resorption "ays on the surface of hard tissue!cytoplasmic vacuoles&

-  +ppear on surfaces of roots of primary tooth ithadvancing permanent tooth

- Periodontal ligament undergoes apoptotic cell death $shrin,age and death of cells so that they can "ephagocytosed "y neigh"oring cells&

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a. Pressure from erupting permanenttooth

b. Odontoclasts adhere to hard tissue

surface and acidify it so thatdemineraliation occurs

c. Forces of mastication initiate

resorptiond. Increase in size and forces exerted by

muscles of mastication

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- )onsist of dentin and cementum

- ay remain em"edded in 'a $dec. mand.

2nd molar&

- +n,ylosed to the "one

- ay "e ultimately e%foliated

- Progressively resor"ed

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- Teeth ithout permanent successors

- mpacted successors

- mpacted permanent predecessor 

- 0dontogenic tumor

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