Pressure vs Tension

Tension side

This is a tension site where the bone adjacent to the periodontal ligament has surface lining osteoblasts and no sign of any osteoclasts. 


Pressure side

The very vascular periodontal ligament has cementum on one side and bone on the other where frontal resorption is occurring. Osteoclasts can be seen in their lacunae resorbing bone on it's 'frontal edge'

Excessive Pressure

This is an area of excessive pressure where the periodontal ligament has been crushed or 'hyalinized' and the periodontal ligament has lost its structure. 

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