Dentition & teeth morphology

Divergent roots, less curved & little or no root trunk

Primary or Secondary (1 or 2)

Primary

Shorter and more narrow mesiodistally

1 or 2

Primary

Enamel rods occlusally in gingival third

1 or 2

Primary

Enamel rods cervically in gingival third

Secondary

Teeth darker in color

Secondary

Peimary teeth

1 mm enamel thickness

Permanent teeth

2.5 mm thickness

Occlusal table narrow faciolingually

Primary

Leeway space mandi

3.1 mm

Leeway space maxi

1.3 mm

Primate space

Mandi- distal to canine

Maxi- mesial to canine

Molar bitewing radiograph

Most frequently taken radiograph in pediatric dentistry

1 bitewing for posterior teeth

Use in pediatric patients

2 bitewing for posterior

Use in pts with 2nd molar is erupted and adults

First panoramic x-ray

6 yr age

First bitewing x-ray

After posterior teeth established contacts

Mandi second molar

M/C retained due to congenitally missing permanent successor

Primary maxillary canine

Mesial ridge is longer than distal (opposite of all canine)

Primary maxillary 1st molar

2 cupid molar mesio- buccal & -lingual

Buccal longest, lingual sharpest

Occlusal groove - H shaped

Total 4 cusp present (2 indistinct)

Primary dentition

Don’t have mamelons on incisors when they erupt

Ectoderm

Form enamel

Mesoderm

Form dentin & pulp

5 lobs

First molars & mandi 2nd PM

4 lobes

All anterior, all PM except mandi 2nd and 2nd molars & third molars

Third molars can be anything

Mamelons

Usually worn off when comes in function

If not then malocclusion present

Von korff’s fiber

Formation of dentin matrix

Mark beginning of mantle dentin

Initially collagen 3 with fibronectin then collagen 1

Originate from odontoblasts towards inner enamel epithelium

Von ebner lines

Incremental dentin growth

Mark normal rhythmic position of organic matrix

Deposition rate 4 micrometer/day

Inward and root ward direction

Plexus of Raschkow

Subodontoblastic nerve

In cell free zone of weil

Only in crown portion

Tertiary dentin (reparative dentin

Dentin laid down by newly formed odontoblast like cells

Secondary or tertiary (?) dentin/ reactionary dentin

Dentin laid down by preexisting odontoblasts

Trauma to primary teeth

Trauma happens before complete calcification of permanent then hypocalcification occurs. Seen in mandi incisors

Color change in teeth after months or weeks indicates necrosis

Color change in 1 to 2 days indicates hemorrhage.

Citrus fruits exposure to enamel

Excess exposure or habitual sucking citrus produce generalized erosive hypocalcification mimic amelogenesis imperfecta

Enamel etch pattern

Type1: honeycomb

Type2: cobblestone

Type3: combination of 1 & 2

This three seen in occlusal & middle third of crown

Type4: pitted

Type5: prismless

Seen in cervical third