Dental Hygiene Seminar DENTAL ANATOMY

Which premolar most often has two roots

Maxillary 1st Premolar

Which tooth has a mesial crown and root concavity

Maxillary 1st Premolar

Which tooth has the longest root

Maxillary Canine

Teeth which most often fail to develop

Third molar and Maxillary lateral Incisor

Tooth with non-functional lingual cusp

mandibular 1st premolar

tooth that most likely exhibits lingual caries

Maxillary lateral incisor

Which premolar commonly has 3 cusps

Mandibular 2nd premolar

Tooth most affected by "microdontia" "peg"

Maxillary lateral incisor

Which part of the cell?

- contains lipid bilayer with proteins

- controls passage of materials in/out of cell

Cell membrame

Which part of the cell?

- stores genetic material of cell (DNA)

- controls chemical reactions and synthetic activities

Nucleus

Which part of the cell?

- watery gel enclosed by a membrane; contains organelles

- all metabolic activities occur here

Cytoplasm

Which part of the cell?

- contain digestive enzymes for cellular digestion

- important for phagocytosis

Lysosomes

Which part of the cell?

- packaging and secretion of protein material

Golgi Apparatus

Which part of the cell?

- energy production (ATP)

- "powerhouse of cell"

Mitochondria

Which part of the cell?

- network of membranes

Endoplasmic reticulum

Rough endoplasmic reticulum contains

ribosomes for protein synthesis

Which part of the cell?

- structural support for cell

Filaments/Tubules

Origin and formation of teeth

Odontogenesis

3 layers of human embryo

ectoderm, mesoderm, endoderm

Which layer of the human embryo is being described?

- outer covering of the body

- lining of oral cavity and enamel

- contains nervous tissue

Ectoderm

Which layer of the human embryo is being described?

- forms skeletal and muscular systems

- contains organs

Mesoderm

Which layer of the human embryo is being described?

- epithelial lining of internal organs (stomach,instestine)

Endoderm

The development of the face begins at week three with the formation of the __________

Stomodeum

Tooth enamel forms from

Ectoderm lining the stomodeum

Dentin, pulp, and cementum form from

Underlying connective tissue known as ectomesenchyme

Which stage of tooth development?

- ectoderm lining the stomodeum gives rise to oral epithelium and dental lamina

Initiation Stage (1st stage)

Which stage of tooth development?

-dental lamina grows into underlying mesenchyme in 20 different places

Bud Stage (2nd stage)

Which stage of tooth development?

The enamel organ develops from the dental lamina and will produce enamel

The dental papilla arises from connective tissue and produces pulp and dentin

dental sac surrounds developing tooth and becomes PDL cementum and alveolar bone

- proliferation

Cap Stage (3rd stage)

Which stage of tooth development?

Cells increase in number and form a bell shape enamel organ has four distinct layers

1. OEE

2. Stellate Reticulum

3. Stratum Intermedium

4. IEE

The greatest extent of differentiation occurs at this stage

Bell Stage (4th stage)

The inner enamel epithelium becomes _____ that form enamel

ameloblasts

The basement membrane separates the IEE from the

Dental papilla

______ from the dental papilla form dentin

odontoblasts

Which stage of tooth development?

- layer by layer formation of tooth structure

Apposition stage (5th stage)

Which stage of tooth development?

- tooth tissues fully mineralize with hydroxyapatite

Maturation Stage (6th stage)

Hydroxyapatite is

Crystallized calcium phosphate

Four layers of enamel condense together after the production of enamel

Most of this is lost after eruption

Reduced enamel epitheliium (REE)

The remaining part of the REE after tooth errupt's

Junctional Epithelium (JE)

Used as the "blueprint" for root outline

Dissolves after root formation

Hertwigs epithelial root sheath

remaining cells of hertwigs epithelial root sheath

may be a source of cysts in the PDL

Rest of Malassez

The first deciduous incisors errupt at about

6 months

The primary dentition is generally complete by age

30 months

The primary dentition begins forming as early as _____ weeks in utero

6 weeks

Eruption dates for primary teeth

Mand. central incisor- 6 month

Mand. lateral incisor- 7 month

Max. central incisor- 8 month

Max. lateral incisor- 9 month

Mand. 1st molar- 12 month

Max. 1st molar- 14 month

Mand. Canine- 16 month

Max. Canine- 18 month

Mand. 2nd molar- 20 month

Max. 2nd molar- 24 month

Primary dentition consists of _____ teeth

20

The permanent dentition consist of_______ teeth

32

The first permanent tooth typically erupts at age

6 years old

The most common first permanent tooth to erupt is the

First mandibular molar

The erruption of the first permanent tooth denotes the beginning of the

mixed dentition stage

The mixed dentition stage generally last through age _____ or ____ with the loss of the last deciduous tooth

12-13

The permanent dentition begins forming as early as _____ in utero

4 months

Permanent Dentition Eruption Times

Mand. 1st molar- 6 years

Max. 1st molar- 6 years

Mand. Central incisor- 6-7 years

Mand.Lateral incisor- 7-8

Max. Central incisor- 7-8 years

Max. lateral incisor- 8-9 years

Mand. Canine- 9-10

Max 1st premolar- 10-11 years

Max 2nd premolar- 10-12 yrs

Mand 1st premolar- 10-12 years

Mand. 2nd premolar- 11-12 years

Max canine- 11-12 years

Mand 2nd molar- 12-13 years

3rd molars -17-21

In the mixed dentist in stage, the last teeth to irrupt are usually the__________ or ________

Maxillary Canine or Mandibular 2nd premolar

Due to this reason, these teeth are most likely to lack adequate eruption space, and may become impacted

The primary first molars are replaced by the

Permanent first premolars

The primary second molars are replaced by the

Permanent second premolar's