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Developmental Abnormalities of Teeth

anodontia congenital lack of teeth associ. w/ ectodermal dysplasia affect decideous or permanent
hypodontia lack +1 teeth affect permanent or decideous usually bilateral, familial, id during clinical+radiographic exam
what is the most common missing permanent teeth in hypodontia? mandibular+maxillary 3rd molars maxillary lateral incisors mandibular second premolars
what is the most common missing decideous tooth in hypodontia? mandibular incisors
what is total andontia lack of all teeth
types of treatment for hypodontia may require prosthetic replacement orthodontic eval. and tx maybe necessary *may be component of syndrome--syndrome is group of findings that occur together so eval. patients for other abnormalities
ectodermal no eyebrows/eyelashes multiple missing teeth cone-shaped anteriors
what is supernumerary teeth also known as hyperdontia
what are supernumerary teeth most often seen maxilla
what is supernumerary teeth extra teeth found in dental arches from formation of extra tooth buds in dental lamina, from cleavage of already existing tooth buds occurs permanent or deciduous found radiographic, unilateral or bilateral
what are mesiodens most common supernumerary tooth located b/t maxillary cental incisors -may be inverted on radiographs, small tooth, short roots, conical crown
what are distomolar second most common supernumerary tooth located distal to 3rd molar
what syndrome can supernumerary teeth be associated with cleidocranial dysplasia or Gardner syndrome
treatment for supernumerary teeth erupted-removal if fucking other shit up nonerupted- should be extracted b/c risk of developing cyst around crown
what is microdontia +1 teeth smaller than normal
what is true generalized microdontia (hint who is it seen in) seen in pituitary dwarf all teeth smaller than normal
what is generalized relative microdontia? normal sized teeth appear small in large jaw
which teeth are most commonly involved teeth with microdontia involving a single tooth? maxillary lateral incisor maxillary third molar
what is macrodontia? +1 teeth larger than normal
what is true generalized macrodontia? seen in pituitary giantism
what is relative generalized macrodontia? large teeth in a small jaw
in what cases would macrodontia been seen affecting a single tooth? cases of facial hemihypertrophy
what is gemination single tooth germ attempts to divide in two
how does gemination appear radiographically? usually one root and single pulp canal exist
how does gemination appear clinically? two crowns joined together by notched incisal area
(T/F, referring to gemination) a patient doesn't have a full complement of teeth false, they do
what is fusion? union of two normally separate adjacent tooth germs
how does fusion appear clinically? appears as single crown that occurs in place of two normal teeth
how does fusion appear radiographically? either separate or fused roots and root cananls seen
(T/F, referring to fusion) this patient is usually short one tooth true
what is concrescences? two adjacent tooth united by cementum -usually discovered on radiographs
(T/F, referring to concresences) if one tooth needs to be removed, it can be detached from the tooth it is fused to False, both teeth need to be removed
what is hypercementosis? excessive amounts of cementum on apcial third of root surface
how does the root appear during hypercementosis? bulbous
does the perio. membrane stay intact around excessive cementum? yesh!
what is dilaceration? abnormal curve or bend in root of tooth -usually discovered on radiographs
when do dilacerations cause a problem? when tooth needs to be removed or a root canal is needed
what is an enamel pearl (and what is is also known as?) small, spherical enamel projection on root surface aka. enameloma
where are enamel pearls usually found? maxillary molars
problems with enamel pearls? difficult for instrumentation can be mistaken for calculus removal maybe necessary if perio. problem occurs in furcation
what is a talon cusp accessory cusp located in cingulum area of maxillary/mandibular permanent incisor -contains pulp horn, may interfere w/ occlusion
what is taurodontism (and what is it also known as?) teeth have elongated pulp chambers and short roots -occurs permanent and deciduous, id on radiographs aka. bull like teeth
what are the abnormalities in the number of teeth? anodontia, hypodontia, supernumerary-mesiodens,distomolars
what are the abnormalities in the size of the teeth microdontia, macrodontia
what are the abnormalities in the shape of teeth? gemination, fusion, concrescence, dilaceration, enamel pearl, talon cusp, taurodontism, dens in dente, dens evaginatus, supernumerary roots
what are the abnormalities of the tooth structure? enamel hypoplasia, enamel hypocalcification, endogenous staining of teeth, regional odontodysplasia
what are the abnormalities of tooth eruption? impacted teeth, embedded teeth, anklosed teeth
what is dens in dente (and what is it also known as?) occurs when enamel organ invaginates into crown of tooth before mnineralization aka. dens invaginatus
how does dens in dente appear radiographically? appears as a tooth like structure w/in tooth
what are dens in dente vulnerable to? caries, pulpal infections, necrosis
what is dens evaginatus? accessory enamel cusp found on the occlusal tooth surface -may cause occlusal problems
where is dens evaginatus most often seen? mandibular premolars
where are supernumerary roots most common? maxillary and mandibular 3rd molars if multirooted teeth involved
when would supernumerary roots become clinically significant? if removal or endodontia is needed
what is enamel hypoplasia? incomplete or defective formation of enamel -affects permanent or deciduous
enamel hypoplasia may be due to what factors? amelogenesis imperfecta, febrile illness (measles, chicken pox), vitamin deficiency, infection of a deciuous tooth, ingestion of fluoride, congenital syphilis, birth injury, idiopathic factors
what's Turner tooth? enamel hypoplasia from infection or trauma to adult tooth from deciduous usually single tooth affected color yellow-brown, severe pitting, deformity]
what are one of the most sensitive cell groups in the body? ameloblasts
enamel hypoplasia resulting from fluoride--ingestion of h2o w/ 2-3xs recommended amount leads to what type of appearance on the enamel white flecks and chalky opaque areas of enamel
enamel hypoplasia resulting from fluoride--ingestion of 4xs recommended amount leads to what type of appearance on the enamel causes brown or black staining
how is congenital syphilis transmitted? infected mother to fetus via placenta
what causes Hutchinson incisors and mulberry molars? enamel hypoplasia resulting from congenital syphilis
(T/F) enamel hypoplasia may occur due to trauma/injury at time of birth True
(T/F) Mild illness or systemic problems can't really result in enamel hypoplasia False, it can result in enamel hypoplasia
what is enamel hypocalcification? developmental anomaly resulting in disturbance or maturation of enamel matrix -underlaying enamel may be soft and susceptible to caries
how does enamel hypocalcification appear? usually appears as a chalky, white spot on middle 3rd of smooth crown
what is endogenous staining of teeth? result of deposition of substances circulating systemically during tooth development
(T/F) endogenous staining of teeth is intrinsic true
what are some possible causes of endogenous staining of teeth? tetracycline stain, erthroblastosis fetalis-Rh incompatible neonatal liver disease congenital porphyria -inherited metabolic disease
what a reregional odontodysplasia also known as? ghost teeth
what is regional odontodysplasia? one or several teeth in SAME QUADRANT exhibit marked reduction in radiodensity and characteristic ghostlike appearance -very thin enamel and dentin are present
what is the tx for regional odontodysplasia? extraction
what's the difference between impacted and embedded teeth? impacted teeth-can't erupt b/c obstruction embedded teeth- lack eruptive force
(T/F)only 3rd molars can be impacted False. any tooth can be impacted -3rd molars classified according to position of tooth
(T/F) teeth can be completely or partially impacted in bone True, it can be either -partially impacted teeth are prone to infection
what is the tx for impacted and embedded teeth? remove to prevent odontogenic cyst, tumor formation, damamge to adjacent teeht, prevent infection -optimal time b/t 12-24 years old
what are ankylosed teeth? tooth cementum fused to bone
what is the problem with ankylosed teeth? prevents exfoliation of deciduous tooth and eruption of permanents
(T/F) the periodontal ligament space is still present with ankylosed teeth? False. the pdl space is lacking
why might ankylosed permanent teeth may need to be removed? to prevent malocclusion, caries, periodontal disease
Created by: 100000001783325
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