Resorption related to orthodontics and some morphological features of the periodontal microvascular bed

Abstract

Summary. Human premolars were obtained for sectioning following rapid maxillary expansion to observe the pattern of resorprion and cementum deposition. Some sections were demineralized and examined by light microscopy, while the root surface of adjacent sections were observed in the scanning electron microscope. The pattern of repair by cementum was noted and found to differ from normal cementum. In addition, the vascular pattern of the periodontal ligament in rat molars has been studied by methacrylate perfusion techniques. The vasculature of the inter‐radicular area differed from that over die remaining root surface because of the presence of a dense plexus of large venous vessels. It is considered that there may be a relationship between vascular architecture and the processes of cementum deposition and root resorption.

Root Resorption in the Furcation Area: A Differential Diagnostic Consideration

“…Root resorption requires some form of injury to the precementum or the predentin to occur 3 . This injury is common to what previously were considered different types of root resorptions and may be chemical, 13,15,16 traumatic, 7,8,13 consecutive to orthodontic treatment, 4,9,10 surgical procedures, 8,17,18 and periodontal treatment 13 . In the absence of further continuous stimulation, the process most likely resolves with the formation of cementum‐like tissue 3 .…”

“…Nevertheless, sometimes root tissues may experience a loss of substance because of damage to the periodontal ligament after inflammation 2,4‐6 . When this happens, it is usually found in the apical part of the root and can be the temporary result of occlusal changes, 7 trauma, 7,8 unbalanced orthodontic treatment, 4,9,10 or a consequence of a communication between the periodontal ligament and necrotic pulp tissue, usually via open dentinal tubules or accessory canals 2,4,8 . A more infrequent type of root resorption that affects several teeth without apparent explanation is known as multiple idiopathic root resorption 11,12 …”