Chapter 2 Abnormalities of teeth TEST #1 Flashcards
T/F Ameloblasts in the developing tooth germ are extremely sensitive to external stimuli
True
When do the crowns of deciduous teeth develop?
-14th week gestation through 12 months of age
When do the crowns of permanent dentition occur from?
-6 months to 15 years
What is an enamel defect seen in permanent teeth caused by periapical inflammatory disease of the overlying deciduous tooth?
-Turner’s hypoplasia
Where do you most commonly see turner’s hypoplais?
-Permanent bicuspids
What is dental fluorosis?
-Excess amounts of fluoride can result in significant enamel defects
When is the period for clinically significant dental fluorosis?
-2nd and 3rd years of life
What is the optimum fluoridation of drinking water?
.7 ppm
What is congenital syphilis anterior teeth termed as?
-Hutchinson’s incisors
What is congenital syphilis posterior teeth called?
-Mulberry molars
What is Hutchinson’s triad?
-Hutchinson’s teeth
-Interstitial keratitis
-8th nerve deafness
(Can develop a saddle nose)
What is erosion?
-Loss of tooth structure caused by a nonbacterial chemical process
What is erosion due to acid reflux (gerd) called?
Perimolysis
What is oligodontia?
-Lack of 6 or more teeth
What is hypodontia?
-Lac of 1 or more teeth
What are the commonly most affected teeth for hypodontia?
- 3rd molars
- 2nd premolars
- lateral incisors
What is the most common hyperdontia site?
-Maxillary incisor (mesiodens)
What is an abundance of supernumerary teeth known as?
-Cleidocranial dysplasia
Accessory teeth may be present at or shortly after birth are known as what?
-Natal teeth
What is Riga-Fede disease?
-Traumatic ulcerations of the adjacent soft tissue may occur during breast -feeding (due to natal teeth)
What are the most frequently impacted teeth?
- Mandibular 3rds (most common)
- Maxillary 3rd (2nd most common)
- Maxillary canine (3rd most common)
What is ankylosis in teeth?
-Failure to fully erupt
What is gemination?
-Single enlarged tooth or joined tooth in which the tooth count is normal when the anomalouse tooth is counted as one
What is fusion?
- Single enlarged tooth or joined tooth in which the tooth count reveals a missing tooth when the anamalous tooth is counted as one
What is concrescence?
-Union of two adjacent teeth by cementum alone without confluence of underlying dentin
What is Dilaceration?
-A bend in the tooth root
Where does dens evaginatus occur?
-Premolar teeth, usually bilateral and more common in the mandibular arch
What is a tooth within a tooth known as?
-Dens in dente
What is a deep surface invagination of the crown or root that is lined by enamel?
-Dens in dente
What is the most common tooth that gets a dens in dente?
-Permanent lateral incisors
What is an enlargement of the body and pulp chamber of a multi-rooted tooth, with apical displacement of the pulpal floor?
-Taurodontism
