Abstract
Abstract The factors involved in the aetiology of malocclusion are numerous but traditionally have been divided into general and local factors. General factors are often quoted as being skeletal factors, soft tissue factors, and habits, whilst dento-alveolar factors are often referred to as local. This division into general and local factors can give the wrong impression as to how each of these aetiological agents act in the production of a malocclusion. For example, the effect on the occlusion of incompetent lips might be limited to proclination of the upper incisors, whilst having no effect on the buccal segment teeth or lower incisors. On the other hand, the dento-alveolar factor of crowding, due to one or more large teeth, is often described as a local factor.
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