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Chapter 18

deciduous teeth

are also called primary or baby teeth

How many deciduous teeth are replaced with Permanent teeth?

every deciduous or primary tooth will be replaced by a permanent tooth

How many deciduous teeth are there in the mouth ?

there are 20 deciduous teeth in the mouth

When does the first permanent tooth erupt?

around age 6

What is a mixed dentition?

a mixed dentition exists when the person has both primary and permanent teeth present

mixed dentitions are typically seen in those that are ______years of age

6 - 13 years of age

What type of tooth does a Primary dentition not have?

premolars and 3rd molars

In order to identify a specific primary tooth, each primary tooth is given ___ in the Universal Numbering System.


A child gets his first complete set of primary teeth by the age of __.


The Main purpose of the primary dentition is

to hold a space for permanent teeth.

FIrst molars are labeled

b & i

Eruption ___ is more important than eruption ___ in the primary dentition.

sequence, dates

How many tissue layers for the enamel surface?


__ to __ weeks in utero tooth buds develop.

6, 7

____ ____ come in before canines

first molars

Green-gray residue consists of the fused tissue of ____ ____ ____

reduced enamel epithelium

Mineralization of the primary teeth begins in utero at ___ to ___ weeks.


By ___ to ___ weeks during prenatal development, all primary teeth have started to mineralize.

13 to 16

There are usually ___ primary teeth visible in the oral cavity at birth.


The primary dentition takes about ___ to ___ years to be completed. Begining with the ___ ____ ____ ____, and later being completed with root formation in the ___ ____ ____ ____.

2,3, primary mandibular central incisors, primary maxillary second molar

interproximal spaces are

is the area between adjacent tooth surfaces.

interproximal spaces are necessary between primary teeth for the

proper alignment of future permanent teeth

Primate spaces are

development spaces between primary teeth.

Primate spaces can be seen between..

primary maxillary lateral incisor and canine and also between primary mandibular canine and first molar

extensive extrinsic staining of the primary teeth may be attributed to

Nasmyth's membrane (green-gray residue)


extensive wear



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