Mainly due to mandibular hypoplasia, third molar eruption when the lack of sufficient position does not fully erupted, the eruption of the crown or crown position only partially skewed, a few teeth in the bone completely ambush.
Clinically, the vertical position of the soft tissue impacted mandibular third molar pericoronitis the largest reason is that the distal part of the crown is gingival tissue coverage, during which constitute the deep blind bags, food scraps into the bag easy to clean exclude blind . Blind gingival flap pockets temperature and humidity is conducive to bacterial growth and reproduction, when the crown and the gingival flap soft tissue by the pressure of tooth eruption, resulting in poor Dental Instruments local blood supply, and chew food when they were bitten by the contralateral teeth, bacteria can intrusion.
Strong resistance in the body, the local symptoms was not obvious, but the work fatigue, lack of sleep, menstruation, childbirth or after a cold, etc., the body defenses are weakened, pericoronitis can be acute.
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