The center of resistance of teeth in Orthodontics.
Titel:
The center of resistance of teeth in Orthodontics.
Auteur:
Ioannis S. Papageorgiou
Verschenen in:
Hellenic orthodontic review
Paginering:
Jaargang 8 (2005) nr. 1 pagina's 41-55
Jaar:
2005
Inhoud:
The aim of this study is to review the literature on what concerns the center of resistance of one tooth or a group of teeth. Authors’ views about the center’s exact location often differ. This study presents the main methods used for determining the center of resistance; relevant studies and their results are also reported. The center of resistance of single-rooted teeth is found at a point located at a distance of 33-42% of the root length, when measured from the alveolar crest. Its location may change depending on root length, direction of applied forces, quantity of surrounding bone and age; there are indications that its location is also affected by tooth morphology, type of periodontal ligament, quality of surrounding bone, tissue response to forces applied, degree of humidity of neighboring osseous structures and tooth axial inclination. The center of resistance of a group of teeth differs depending on the number of teeth. Most research studies concern upper incisors and upper anterior teeth. However, there are conflicting views about the center’s location during palatal movement and intrusion. Furthermore, our knowledge concerning the factors affecting the center of resistance of a group of teeth is limited; this may be due to the fact that these factors cannot be easily measured when a tooth group is involved. Nevertheless, an orthodontist treats patients rather than centers of resistance and methods successfully tested in clinical practice should not be rejected, even if they might be based on theoretical centers of resistance.
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