Dental abnormalities associated with specific syndromes and/or severesystemic abnormalities in tooth number, form or size are challenging cases in dentistry, affectingesthetics and function. Microdontia is used to ter...Dental abnormalities associated with specific syndromes and/or severesystemic abnormalities in tooth number, form or size are challenging cases in dentistry, affectingesthetics and function. Microdontia is used to term abnormally small teeth that generally themaxillary lateral incisor or third molar is involved. On the other hand, the entire dentition may beaffected as well. Prevalence of microdontia range from 1.5% - 2%. The definition of severehypodontia is four or more tacking teeth. The prevalence of severe hypodontia was found to be lessthan 1% of the unselected population. In another study hypodontia is seen with a higher incidence inthe permanent dentition (3.5% - 6.5%), compared to that of the primary one (0.1% - 0.9%). Theetiology seems to be inheritance in most cases of hypodontia. However, some are caused by mechanicaltrauma to jaws during tooth formation, by infection or by the effects of cytostatica and radiationduring cancer treatment. There are more than 160 syndromes combined with hypodontia. Some of themare ectodermal dysplasia, Rieger syndrome and incontinentia pigmenti. In such cases morphologicalaberrancies as microdontia and conical crowns may be additional features. In addition to the numberof lacking teeth, tooth eruption, occlusion and craniofacial parameters are influenced. The presentpaper reports the use of maxillary and mandibular overdenture removable complete dentures to treat apatient with class III skeletal malocclusion, reduced vertical dimension of occlusion andunacceptable esthetics caused by a rare case of hypodontia and microdontia.展开更多
文摘Dental abnormalities associated with specific syndromes and/or severesystemic abnormalities in tooth number, form or size are challenging cases in dentistry, affectingesthetics and function. Microdontia is used to term abnormally small teeth that generally themaxillary lateral incisor or third molar is involved. On the other hand, the entire dentition may beaffected as well. Prevalence of microdontia range from 1.5% - 2%. The definition of severehypodontia is four or more tacking teeth. The prevalence of severe hypodontia was found to be lessthan 1% of the unselected population. In another study hypodontia is seen with a higher incidence inthe permanent dentition (3.5% - 6.5%), compared to that of the primary one (0.1% - 0.9%). Theetiology seems to be inheritance in most cases of hypodontia. However, some are caused by mechanicaltrauma to jaws during tooth formation, by infection or by the effects of cytostatica and radiationduring cancer treatment. There are more than 160 syndromes combined with hypodontia. Some of themare ectodermal dysplasia, Rieger syndrome and incontinentia pigmenti. In such cases morphologicalaberrancies as microdontia and conical crowns may be additional features. In addition to the numberof lacking teeth, tooth eruption, occlusion and craniofacial parameters are influenced. The presentpaper reports the use of maxillary and mandibular overdenture removable complete dentures to treat apatient with class III skeletal malocclusion, reduced vertical dimension of occlusion andunacceptable esthetics caused by a rare case of hypodontia and microdontia.
