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53 Cards in this Set
- Front
- Back
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Do Dental Anomalies happen most in Permanent or Primary Denition? Maxillary or Mandibular?
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Permanent, Maxillary
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What is anodontia?
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Absence of teeth. Total anodontia is absence of a whole set of teeth. Partial Anodontia is missing 1 or more tteth. It is not the same as edentulous or partially edentous. It is a generalized congential deformation, abnormal development of the ectoderm or outer embryonic cell layer.
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What is the difference between hypo and oligodontia?
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Hypo is missing under 6 teeth, Oligo is missing over 6 months.
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What are the most common missing tooth in Partial Anodontia?
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Third Molars, Maxillary>Mandibular, 35% of the general population has at least one congenitally absent 3rd molar.
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What is the 2nd most common missing Partial Anodontia missing tooth.
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Maxillary permanent lateral incisors- 1-2% of people missing one or both.
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What is the third most common missing tooth in partial anodontia?
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Mandibular second premolars - 1% of people missing one or both.
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What are Supernumerary teeth?
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Extra teeth. Teeth that form in excess of the normal dental formulas for each quadrant. Occurs in .3 to 3.8% of the population.
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Where do extra teeth usually occur?
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90% of the time it's in the maxilla.
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What is a mesiodens?
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Small supernumerary tooth located towards the maxillary midline. Can be inverted, have short root, may or may not erupt. If unerupted, pt may have a diastema!
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What is the prevalence (in Caucasians) in the permanent dentition?
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.15-1.9%. In primary dentition it's 0.5%
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Are Supernumerary teeth found distal to 3rd molars?
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Yes. They are called Distomolars, paramolars, fourth molars, or distodens. Don't often erupt and are often discovered through radiographs.
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The most common location for supernumerary teeth in the mandible is........"
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Between the first and second premolar areas. However, extra teeth can also form in most locations in the mouth.
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What tooth has the most variable crown shape of all permanent teeth?
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Maxillary 3rd molars, followed by Mandibular 3rds.
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What is the most common anomaly in tooth shape in the anterior region of the permanent dentition?
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Peg-shaped lateral incisor. Occurs in 1-2% of the population. Broad at the cervical and tapers to the incisal.
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How many lobes are peg laterals formed from
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1. Not 4 dude.
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What is Gemination or Twinning?
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Forms from the splitting or twinning of a single tooth. May appear doubled in width and possibly notched. Has a single or common rooth canal. Most commonly in the maxillary incisors and canines.
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What is Fusion?
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The union of two adjacent tooth germs ALWAYS INVOLVING THE DENTIN. Similar to gemination to tthe tooth will appear wider. However, radiographs will usually show 2 roots with separate pulp chambers.
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How can you tell the difference between Gemination and Fusion?
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1. Radiographs.
2. Count the teeth in the arch. Counting the wider tooth as two teeth. If you come up with the correct number than it's fusion, if you com up with 1 too many teeth it's gemination. |
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When do Hutchinson incisors and Mulberry Molars occur?
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Occur if a syphilis infected mother passes on her disease to an infant and can occur in both dentitions. H incisors are broad cervically, narrow incisally, and have notched incisal edges. M. Molars are first molars which may have occlusal anatomy made up of multiple tiny tubercles with poorly developed and indistinguishable cusps.
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What do Accessory cusps, tubercles or ridges result from?
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Developmental localized hyperplasia - increase in volume of tissue caused by growth of new cells crowded conditions prior to eruption may result in fusion of a supernumerary tooth.
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What is Tuberculum intermedium?
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Third (middle) lingual cusp on mandibular molars.
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What is a Dens evaginatus?
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Talon cusp. A projection on lingual surface of maxillary or mandibular anterior permanent teeth. Can be mistaken for a supernumerary tooth on a radiograph. It can look like a superimposition.
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What type of anomaly frequently has a pulp horn, and sometimes has to be removed due to biting interference?
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Talon cusps. If it does have a pulp horn it will need endodontic treatment.
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What are two varations in tooth size?
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Microdontia and Macrodontia
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Name: Amount of radiation emitted by source or administered dose of radiation
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Curie
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What is enameloma?
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Enamel pearl. Small round nodules of enamel. May have a tiny core of dentin and even a pulp horn. Most commonly found on molars near the furcation, may lead to periodontal problems.
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What is Taurodontia?
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Bull teeth, prism teeth, pulp chamber is very long, no constiction at teh CEJ. Only in permanent teeth. Frequency of <1 in 1000 in Native Americans and some Arctic populations.
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What causes Taurodontia?
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Caused by a disorganization of the calcified tissues and possibly occurs in dentitions subjected to heavy use.
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What is Dilaceration?
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A sever bend or angular distortion of a tooth root.
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What is Dens in Dente?
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Tooth within a tooth. Invagination of the enamel organ within the crown of a tooth. Clinically seen as a crevice or deep pit at the cingulum. Most commonly maxillary lateral incisors, but has been noted in centrals and mandibular incisors.
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What is Dens invaginatus?
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Exaggeration of the process of formation of a cingular or lingual pit. Most commonly on maxillary lateral incisors.
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What is Concrescence?
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Invovles the superficial fusion of two adjacent tooth roots. Become joined after eruption due to the close proximity of the roots and excessive cementum deposition. Most frequently in the maxillary molar region.
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What are dwarfed roots?
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Short little roots.
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What is Hypercementosis?
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Excessive formation of cementum around the root of a tooth after the tooth has erupted. May be caused by trauma, metabolic dysfunction or periapical inflammation.
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What are Accessory or extra roots?
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Usually in teeth whose roots form after birth.
Probably caused by trauma, metabolic dysfunction, or pressure. Third molars most likely to have accessory roots, can be on other molars. |
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What is the tooth most likely to have an accessory root?
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Mandibular Canines and then Mandibular Premolars
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What are Unerupted teeth?
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Embedded teeth that fail to erupt into the mouth because of a lack of eruptive force.
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What are impacted teeth?
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Teeth that fail to erupt due to mechanical obstruction, often related to the evolutionary decreasing size of modern man's jaw.
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What is Transposition?
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Tooth buds get in the wrong place.
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What is the most commonly transposed tooth?
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Most common is maxillary canine.
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What is the most common tooth rotation?
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Maxillary second premolar, but you'll see various teeth with some rotation.
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What is Ankylosis?
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Loss of the periodontal ligament (PDL) and subsequent fusing of the tooth to the alveolar bone. Could be a result of trauma, may be initiated by an infection. Re-implanted teeth improperly splinted.
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What type of anomaly is when a tooth often fails to reach normal occlusal height, especially if it's a primary tooth without a permanent successor?
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Ankylosis
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What is Dysplasia?
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A generic term that indicates abnormal development.
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What is Hypoplasia?
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A form of dysplasia that refers to an incomplete formation of a tissue. Hypomineralization or Hypocalcification.
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What is Enamel Dysplasia?
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1. A disturbance in the enamel-forming cells (ameloblasts) during early enamel formation.
2. Can be hereditary -amelogenesis imperfecta. 3. Result from a systemic cause-high fever. 4. Local disturbances -trauma 5. Variations in morphology or color can result. |
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What is Amelogenesis imperfecta?
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A type of Enamel Dysplasia.
A hereditary disorder that affects enamel formation of both dentitions. Partial or complete lack of enamel results in rough yellow to brown crowns that can decay quickly. U.S. incidence of 1 in 15,000. |
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What is Fluorosis?
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Type of Enamel Dysplasia
Too much fluoride during tooth development. |
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What can happen when someone gets a very high fever.
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Developing crowns can exhibit damage ie measles. This is a form of Enamel dysplasia.
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What is Focal Hypoplasia?
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Localized spot or deformed area on a tooth, usually from trauma, local infection.
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What is turner's tooth
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A tooth most likely to be seen in a succedaneous teeth. Enamel Dysplasia.
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What is Dentin Imperfecta?
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Both Dentitions are affected. Partial or total loss of pulp chambers. Teeth are weak and will usually be susceptible to severe attrition. 1 in 8000 experience this.
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What is a Tetracycline stain?
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If taken by a pregnant woman or infant/child during tooth development it can stain the teeth. Usually starts yellow and changes to brown and gray as the teeth age.
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