DENTO-ALVEOLAR RESORPTION IN PERIODONTAL DISORDERS 309 



A 



11 



Fig. 8. A, destruction of the maxillai\- bone in the labial alveolar region due 

 to migration of the teeth following a bite sinking; osteophytes are seen on the 

 facial side of the right lateral incisor. B, x-ray of the teeth in A. 



pockets on the lingual side of the migrated teeth. Resorption of the 

 lamina dura of the teeth and of their root tips is also seen. 



The progression of these alterations can best be observed in x-ravs 

 of the lower front region ( Fig. 9 ) . Here the first reaction usually is 

 resorption in the central part of the septa, followed by an extension 

 of their nutritional canals, widening of the apical part of the perice- 

 mentum, and root tip resorption. When the changes are not accom- 

 pa,nied by a breakdown in the marginal part of the alveolar bone. 



Fig. 9. Reactions to h)perfunction in mandibular incisor region. A, pulp 

 stones in the region of the tooth necks, dentin formation in the crowns. B, pulp 

 stones, dentin formation, breakdown of the central parts of the septa, widening 

 of the apical part of the pericementum, root tip resorption. C, there is very little 

 left of the pulp, the nutritional canals in the septa are visible, the apical part 

 of the pericementum is extended, the root tips are blunt. In A and B there is 

 no marginal destruction of the septa, indicating that the reactions in their pro- 

 found parts are not due to a gingivitis, but to hyperf unction. 



