5_6235703729610293303.pdf - Lubna Al-malah PEDODONTICS lec...

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PEDODONTICSLubna Al-malah lec 7REACTION OF PERMANENT TOOTH BUDS TO INJURYThe dentist who provides emergency care for a child after an injury to the anterior primary teeth must be aware of the possibility of damage to the underlying developing permanent teeth.The close anatomic relationship between the apices of primary teeth and their developing permanent successors explains why injuries to primary teeth may involve the permanent dentition The dentist and the physician should also be aware of the possibility of trauma to permanent tooth buds from other unusual injuries so that the parents may be informed of the possibility of defective permanent tooth development.
PEDODONTICSLubna Al-malah lec 7Some injuries to the face and jaws may not appear to have caused any dental injuries initially, but the problem may be noticed several months or years laterHYPOCALCIFICATION AND HYPOPLASIAGross malformed crown, small pigmented hypoplastic areas referred as (Turner tooth).Small hypoplastic defects may be restored by the resin-bonding technique.A disturbance in enamel matrix formation produces enamel hypoplasia which is characterized by irregular thickness of enamel and presence of pits and grove in the enamel surface. Any defect in the mineralization process, the enamel thickness is normal but poorly mineralized. It can be found in both primary and permanent dentition.REPARATIVE DENTIN PRODUCTIONIn cases in which the injury to the developing permanent tooth is severe enough to remove the thin covering of developing enamel or cause destruction of the ameloblasts, the subjacent odontoblasts have been observed to produce a reparative type of dentin. The irregular dentin bridges the gap where there is no enamel covering to aid in protecting the pulp from further injury.DILACERATIONTooth with sharp bend in crown or root is known as dilacerated tooth. Dilacerations is most commonly seen in maxillary permanent central incisors. Most common cause of dilacerations is trauma to the deciduous teeth (Occasionally occurs after the intrusion or displacement of an anterior primary tooth. The developed portion of the tooth is twisted or
PEDODONTICSLubna Al-malah lec 7bent on itself, and in this new position growth of the tooth progresses. Germination may appear in the part of the tooth formed after the injury). Dilacerated tooth usually fails to erupt but may sometimes erupt into an abnormal position and can cause displacement of adjacent teeth.**Crown of a permanent tooth or a portion of it develops at an acute angle to the remainder of the toothTypes of luxation injuries :concussion:the tooth is not mobile and is not displaced , the PDL absorbs the injury and is inflamed ,which leaves the tooth tender to biting pressure and percussion, no bleeding from gingiva.
PEDODONTICSLubna Al-malah lec 7Subluxation:occurs when the tooth is mobile but is not displaced, there is also damage to PDL , gingival bleeding can be seen , and the tooth also tender to percussion.

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