Question:what Do Remnants Of Hertwig Sepithelial Root

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AAPD QE Board Exam Questions with

Detailed Verified Answers

Question: What layer do neural crest cells develop from?

Answer: Ectoderm

Question:At what embryonic age does the dental lamina begin to develop?

Answer: 6 weeks

Question:What are the three components of the tooth bud?

Answer: Enamel Organ

Dental papilla

Dental sac

Question:What are the three morphologic stages of a developing tooth bud?

Answer: Bud stage

Cap stage

Bell stage

Question:During the bell stage invagination of the epithelium occurs, which

layer is essential for enamel production?

Answer: Stratum intermedium

Question:Which cells does the stellate reticulum support and protect?

Answer: Ameloblasts

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Question:What do remnants of Hertwig’s epithelial root sheath persist as?

Answer: Rests of Malassez

Question:What is the origin of the dental papilla?

Answer: Neural crest cells

Question:What does the dental papilla differentiate in to?

Answer: Dentin and primordium of pulp

Question:What are enamel pearls?

Answer: Cells of epithelial root sheath that remain attached to dentin.

Differentiate into ameloblasts and produce enamel

Question:What are the 7 steps (in order) of histophyisological differentiation

of a tooth bud?

Answer: Initiation

Proliferation

Histodifferentiation

Morphodifferentiation

Apposition

Mineralization

Maturation

Question:During which stage of tooth development may problems that lead

to anomalies of tooth number occur?

Answer: Initiation

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Question:Which three stages of tooth development encompasses the bud,

cap, early bell and late bell?

Answer: Proliferation

Histodifferentiation

Morphodifferentiation

Question:Disruptions of proliferation may result in what type of tooth

anomalies? (4)

Answer: Size

Proportion

Numbers

Twinning

Question:Which stage of tooth development may lead to anomalies of the

enamel, dentin, and cementum?

Answer: Morphodifferentiation

Question:What is the incidence of hyperdontia? Males vs females?

Answer: 0.3 – 3%

Males 2:1 females

Question:Is hyperdontia more common in maxilla or mandible? More

common in primary teeth or permanent teeth?

Answer: Maxilla 90%

Permanent dentition 5x more common that primary

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Question:Which permanent teeth are most frequently missing? List in order

from most to least common

Answer: Third molars

Mandibular second pre molars

Maxillary lateral incisors

Maxillary second pre molars

Question:Name 9 syndromes that may be associated with supernumerary

teeth

Answer: Apert

Cleidocranial dysplasia

Gardner syndrome

Crouzon syndrome

Sturge Weber syndrome

Orofacialdigital Syndrome I

Hallermann-Strieff Syndrome – A

Cleft lip and palate

Down syndrome

Question:Which syndrome is associated with shovel shaped incisors?

A. Sturge Weber Syndrome

B. Cleidocranial dysplasia

C. Apert syndrome

D. Hallermann Strieff Syndrome-A

Answer: C. Apert Syndrome

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Narrow high palate

Cleft of soft palate

Delayed or ectopic eruption

Shovel shaped incisors

Hypoplastic midface

Question:Which syndrome is associated with osteomas of the jaw?

A. Orofiaciodigital Syndrome I

B. Apert Syndrome

C. Crouzon Syndrome

D. Gardner Syndrome

Answer: D. Gardner Syndrome

Delayed eruption

Supernum teeth

Osteomas of the jaw

Question:Agensis of third molars is associated with agenesis of which

permanent tooth?

Answer: Maxillary lateral – either one or both

Question:What is the inheritance pattern for non syndromic hypodontia?

Answer: Autosomal dominant

Question:Which teeth (from most to least) commonly present as

microdontia?