1- caries Radiolocence of tooth on X-ray when is exceed 500 um .
2- normal height of alveolar crest of bone is 0,5 - 2 mm below CEJ , and parallel to line drawn between two adjacent CEJ in posterior teeth , while in anterior teeth the crest is pointed .
3 - radiographic changes occur in periodontal diseases after 6 - 8 months of start disease .
4 - radiographic evaluation of periodontal diseases is based on inter-dental septa , because buccal & lingual bone is obscure by dense roots .
5 - bite-wing is better than peri-apical film in evaluation of periodontal disorders .
6 - early S & S of periodontal disorder can be only detected clinically .
7 - the differnt between acutiual alveolar crest height & radiographic apperance is range between 0 - 1.6 mm , according to angulation of the X-ray .
8 - present of intact crestal lamina dura is an indictor for healthy periodentism , while unhealthy one has less diagnostic value , as it can appear unhealthy but with mild periodonitis .
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