Wiggs Flashcards
What is Fluorosis and what is the consequence?
Fluorosis is excess fluoride presence during tooth development and will result in hypocalcification of enamel.
Are hypocalcification and enamel hypoplasia often found together?
Yes
List the 3 phases of tooth eruption
(1) Preeruptive phase
(2) Prefunctional phase
(3) Functional phase
Define the each of the phases of tooth eruption:
(1) Preeruptive phase
(2) Prefunctional phase
(3) Functional phase
(1) Preeruptive phase - the movement of the dental germ within the developing jaws
(2) Prefunctional phase - begins once the crown has formed and the root begins forming.
(3) Functional phase - begins when the tooth comes into occlusion (and ends when when tooth is lost, ankylosed or after death).
What is a premordial cyst?
During development if the a cyst forms prior to the apposition of enamel of dentin it is called a premordial cyst.
Where does the permanent maxillary PM4 erupt in relation to its deciduous counterpart (508 and 608)?
PM4 erupts buccal and slightly distal to its deciduous counterpart. This is opposite to most of the other permanent teeth.
What is the capillary pressures within the periodontal ligament of primates?
20-30mmHg ; 20-26g/cm2
List the six types of tooth movement from easiest to most difficult
Extrusion, tipping, radicular (root mov’t), rotational, translation, intrusion.
Where is the center of rotation / fulcrum, during tipping movement?
The fulcrum created in tipping occurs aproximately at the junction of the middle and apical thirds of the root. The lighter the force, the more apical will be the fulcrum.
When tipping, does the crown or root move?
They both move but in opposite directions.
When tipping a tooth, is there more movement coronal or apical to the fulcrum?
There is more movement of the crown and root that is coronal to the fulcrum - they move greater than the apical portion of the tooth.
During radicular tooth movement, where is the fulcrum?
The fulcrum is found approximately at the junction of the middle and cervical thirds of the tooth.
Describe how radicular movement is clinically performed.
The coronal tip of the tooth is held stationary while compression or tension is applied near the cervical region of the tooth.
Describe translation movement of a tooth.
Translation is the movement of the crown and the root in the esame direction.
Define Thecodont
Teeth firmly in sockets using gomphosis.
Define Acrodont
Teeth ankylosed to the alveolar bone. No socket and no true root structure. Teeth that are lost are replaced by new ones.
What has a stronger attachment: Acrodont or pleurodont teeth
Thecodont teeth.
Pleurodont teeth are teeth that grow from a pocket on the innnerside of the jawbone. There is a larger surface area of tooth in contact with the bone and so attachment is stronger but NOT AS STRONG as THECODONT attachment.
List in order of attachment strength:
Acrodont,
Thecodont,
Pleurodont
Weakest to strongest:
Acrodont, pleurodont, thecodont
State if the following animals have secodont, bundodont, lophodont or selenodont cheek teeth:
Swine
Cattle
Horses
Elephant
Chincilla
Human
Dogs
Cats
Bears
Rhinoceros
Giraff
Deer
Swine - Bunodont (low rounded cusps on occlusal surface - for crushing and grinding)
Cattle - selenodont - (cusps that form a crescent shaped ridge pattern)
Horses - selenodont
Elephant - Lophodont - cusps interconnected by ridges or lophs of enamel
Human - bunodont
Dogs - secodont (cutting tubercles / cusps to provide a cutting or shearing action ie. carnassial teeth) and bunodont molars
Cats - secodont
Bears - bundodont
Rhinoceros - lophodont
Giraff - selenodont
Deer - selenodont
Label each of these three types of cheek teeth:
A unilateral cleft lip occurs when migration fails to occur between ____ and the _____.
between one maxillary process and the medial nasal process.
A bilateral cleft lip occurs wehn _____ fail to migrate and do not meet the ______.
when both maxillary processes faile to migrate to meet the medial nasal process.
A unilateral cleft palate occurs when ____________ fails to fuse with the _____________.
when one of the palatal plates of the maxillary process fails to fuse with the nasal septum
A bilateral cleft palate occurs when __________ fail to fuse with the __________________
when both palatal plates of the maxillary process fail to fuse with the opposite plates at the nasal septum
