DISORDERS OF TEETH -1.pdf

DEVELOPMENTAL DISORDERS OF TEETH -1 REQUIREMENTS FOR DEVELOPMENT OF AN IDEAL DENTITION Formation of a full complement of teeth. Normal structural development of dental tissues. Eruption of each tooth at an appropriate time into proper space. Correct relationsh...

DEVELOPMENTAL DISORDERS OF TEETH -1 REQUIREMENTS FOR DEVELOPMENT OF AN IDEAL DENTITION Formation of a full complement of teeth. Normal structural development of dental tissues. Eruption of each tooth at an appropriate time into proper space. Correct relationship of teeth in opposite arches. ORIGIN OF DEVELOPMENTAL DISORDERS Prenatal Postnatal Inherited Acquired DEVELOPMENTAL DISORDERS Abnormalities of morphodifferentiation: Abnormalities in formation of dental hard tissue Abnormalities of histodifferentiation: Abnormalities in differentiation of dental lamina & tooth germ ABNORMALITIES IN THE NUMBER OF TEETH Anodontia Hypodontia Hyperdontia ANODONTIA Refers to absence of teeth. PARTIAL ANODONTIA  Also known as Hypodontia or Oligodontia. More commonly found in permanent dentition and in females. Teeth commonly involved: third molars, permanent maxillary lateral incisors, mandibular second premolars. Associated with many syndromes. SYNDROMES ASSOCIATED WITH HYPODONTIA Cleft lip and palate Crouzon syndrome: Characterized by: - Craniosynostosis - Maxillary hypoplasia - Hypertelorism Down syndrome Hypohidrotic ectodermal dysplasia Ellis Van Creveld syndrome Oral-facial-digital syndrome HYPOHIDROTIC ECTODERMAL DYSPLASIA Characterized by: Congenital absence of the ectodermal structures. X-linked recessive trait. Patients affected with the syndrome shows abnormal development of the following structures: Skin: Skin is smooth and dry. Hair: Fine. Sparse. Scanty. Sweat Glands: Partial or total absence of sweat glands. Hyperthermia Nails: Fingernails are usually defective. HYPERDONTIA Additional to those of normal series. Also known as supernumerary teeth. Usually develops in the anterior and the molar regions of the maxilla followed by the premolar region of the mandible.  More common in females, in permanent dentition. CAUSES OF HYPERDONTIA Continuous proliferation of the permanent or the primary dental lamina. Presence of a second tooth bud. Splitting of a regular tooth bud. CLASSIFICATION OF HYPERDONTIA Can be classified according to: Shape Position SHAPE Conical Tuberculate Supplemental POSITION 1. Mesiodens: Develops between the maxillary central incisors Most common supernumerary tooth 2. Paramolar: Erupts alongside a maxillary molar. Usually found on the buccal side 3. Distomolar: Develops distal to the third molar CLINICAL IMPLICATIONS Esthetics affected. Malpositioning of the teeth. Dentigerous cysts. Stagnation areas for plaque and calculus. SYNDROMES ASSOCIATED WITH HYPERDONTIA Cleft lip/palate Cleidocranial dysplasia Gardner syndrome: Oro-facial digital syndrome GARDNER SYNDROME Multiple osteomas of jaws Skin cysts and fibromas Impacted teeth other than 3rd molars Supernumerary or missing teeth Abnormal root formation Intestinal polyposis