Seminar Omdr
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Transcript of Seminar Omdr
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TAURODONTISMThe term was coined by Sir Arthur Keith in 1913 to describe a peculiar dental anomaly in which
the body of the tooth is enlarged at the expense of the roots.
The term ‘TAURODONTISM’ means “bull-like” teeth.
Tauro= bulldont=tooth
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• Hammer et al believed that the taurodont is caused by failure of Hertwig’s epithelial root sheath to invaginate at the proper horizontal level.
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TAURODONTISM is characterised by an elongated body and short roots with
longitudinally enlarged pulp chambers.
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Etiology• A specialised or retrograde character• A primitive pattern• A Mendelian recession trait• An atavistic feature• A mutation resulting from odontoblastic
deficiency during dentinogenesis of roots
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Shaw classified taurodont teeth into:
• Hypotaurodont• Mesotaurodont• Hypertaurodont
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Syndromes associated with taurodontism are:
1. Klinefelter syndrome2. Down’s syndrome3. Rapp Hodgkin syndrome4. Trichodentosseous syndromeIt is also commonly associated with
Amelogenesis Imperfecta
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Conditions associated with taurodontism are:
Certain dermatological conditions like- Epidermolysis bullosa Otodental dysplasia Dyskeratosis congenita
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Clinical features:• Age- middle age• Sex- no sex predilection • Site- Deciduous and permanent dentition
affected. Molars are commonly involved. It may be bilateral or unilateral
• Shape of involved teeth- Rectangular shape rather than the normal tapering towards root.
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Radiographic features:• Involved teeth tend to be rectangular in shape
rather than taper towards the roots.• Pulp and pulp chamber- pulp chamber is
extremely large. Pulp lacks the usual constriction at the cervix of tooth.
• Roots- the roots and root canals are exceedingly short
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DIAGNOSIS:• Clinical- Rectangular shaped crown• Radiographic- Extremely large pulp chambers
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Differential diagnosis:Developing Mandibular Molar
Management: No specific treatment as it does not
cause any clinical problems
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HYPERCEMENTOSIS Hypercementosis is a non-neoplastic
condition in which excessive cementum is deposited in continuation with the normal radicular dentin.
It is also called as Cementum Hyperplasia or Exostosis of Root.
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Etiology:• Loss of antagonist• Inflammation of root• Trauma repair (tooth repair)• Osteitis deformans or Paget’s disease of bone• Others-Hyperpituitarism, calcinosis, thyroid goitre, Vitamin A deficiency, Rheumatic fever
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Types of Hypercementosis
• Localised
• Generalised
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Clinical features:• Age-adults• Sex- no sex predilection• Site- premolars are often bilaterally affected. Deciduous and permanent dentition affected• Symptomless (unless periapical infection is
present)• Signs- teeth are vital and not sensitive to
percussion• Roots-roots appear larger in diameter and present
with rounded apices
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• Fusion of teeth- extensive hypercementosis causes fusion of 2 or more adjacent teeth
• Spike formation- it occurs in case of excessive occlusal trauma
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Radiographic features:• Thickening and apparent blunting of roots.• Bulbous appearance of roots.• Apex- Roots exhibit rounding of the apex• Lamina dura- follows the outline of teeth in
normal periodontal space• Bone resorption- irregular accumulation of
cementum that is accomodated by related area of resorption
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Differential diagnosis:
• Multirooted teeth and dilacerated root• Fused root
Management:Treatment of the primary cause
Extraction of teeth with hypercementosis is contraindicated
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CUSP OF CARABELLI It is an accessory lingual cusp located on
the mesiopalatal cusp of maxillary second deciduous molars and first,second,third permanent molars.
Unilaterally or bilaterally present.
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CUSP OF CARABELLI
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Accessory cusp is seen occasionallyon mandibular permanent or deciduous molar.
It is called as “Protostylid”
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MULBERRY MOLAR MULBERRY MOLAR or MOON’S MOLAR is a
characteristic syphilitic lesion of posterior teeth in which the hypoplastic enamel develops with spherical aggregates orglobules on the surface of dentin.
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HUTCHINSON’S INCISOR Enamel Hypoplasia due to congenital syphilis. The anterior teeth affected are called
“ Hutchinson’s teeth”. The upper central incisor is ‘screw driver’
shaped. The mesial and distal surfaces of the crown taper and converge toward the incisal edge. The edge may be notched.
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SUPERNUMERARY ROOTS Teeth that are normally single rooted,
particularly the mandibular bicuspids and the cuspids have two roots.
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Clinical features:• Site- molars,bicuspids, cuspids• They are seen as slender outgrowths at the
centre of furcation area of molars.
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Radiographic features: