terminology lecture7

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Dental terminology
Dr.Issam Aljorani (BDS, MSc. Ortho.)
Lecture 7
Orthodontic
?
Orthodontia (ortho = straight, dont = tooth) is the study dealing with the prevention and
correction of abnormally positioned or misaligned teeth.
Occlusion is defined as a manner in which the upper and
lower teeth intercuspate between each other in all mandibular
positions and movements.
Malocclusion: is an irregularity in the occlusion beyond the
accepted range of normal.
Overjet: it is a horizontal distance between the incisal edges
of maxillary and the labial surfaces of the mandibular central
incisors.
Overbite: it is a vertical overlap of the maxillary and
mandibular central incisors when they are in occlusion.
Crossbite; It is when the upper tooth or teeth lie lingual to
their opposing lower teeth. It is generally of two types:
Anterior Crossbite and posterior crossbite.
Malocclusio
n
Crossbite
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Causes of Malocclusion
Malocclusion occurs from diverse causes and in various forms. Causes include trauma, habits,
poor mouth conditions, or congenital factors.
Classes of malocclusion
In a normal or skeletal class I relationship, the
upper jaw should be approximately 2 to 4-mm
in front of the lower with straight or semistraight
face profile.
In a skeletal class II relationship the lower jaw
is greater than 4-mm behind the upper, with
convex profile.
In a skeletal class III relationship the lower
jaw is less than 2-mm behind the upper, with
concave profile.
Types of orthodontic appliances
Removable appliance: It can be removed from the mouth by the patient to brush their teeth or
eat. It can be used to treated some simple cases.
Fixed appliance: It cannot be removed from the mouth by the patient. It can be used to do all
types of tooth movement.
Aligner: an Invisalign system of computer-imaged and computer-generated clear plastic overlay
trays used with milder cases of misaligned teeth. The patient wears this removable, personal
aligner tray for a designated period of weeks and then progresses to the next tray until movement
has been completed, and the teeth are in position.
Lingual braces: braces that are placed on the tongue side of the teeth
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Intraoral Appliances and Auxiliaries Used in Orthodontics
Bands: stainless steel circles or rings that are sized and cemented around a tooth.
Bracket: a metal, ceramic, composite, or clear resin holding device used to support and stabilize
the arch wire in the mouth.
Arch wire: horseshoe-shaped stainless steel or nickel titanium wire that may be round,
rectangular, or square, the arch wire is attached and held by ligatures to the brackets.
You?can?download?this?lecture?and?slideshow?from??
http://elearn.uobabylon.edu.iq/course/index.php?categor
yid=1051
Dr.Issam M. Abdullah Aljorani
BDS, MSc. Ortho.
Can ask or put a comment at??
https://sayat.me/Issamm
asd.issam@gmail.com
2017