PATTERNS OF BONE LOSS IN PERIODONTITIS
1. The structure of bone loss. Two types of bone loss (1) horizontal and (2) vertical bone loss.
A. Horizontal Bone Loss
1. Horizontal bone loss is the most common scheme of bone loss (Fig. 3-12).
2. This type of bone loss results in a fairly even, a General reduction in the height of the alveolar ridge.
3. Alveolar bone is reduced in height, but the margin of the alveolar ridge, remains more or less perpendicular to the long axis of the tooth.
B. Vertical Bone Loss
1. Vertical bone loss is less common pattern of bone loss (Fig. 3-13). Vertical bone loss, also known as angular bone loss.
2. This type of bone loss will lead to uneven reduce the height of the alveolar ridge.
3. In the vertical loss of bone resorption progresses faster in the bones near the root surface. This uneven pattern of bone loss leaves trenchlike the area of the missing bones with roots.