nomenclature 100305134042-phpapp01
TRANSCRIPT
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Dental TerminologyDental Terminology
B-H .1DDDB-H .1DDD
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Contents
1 .Surfaces of teeth
2 .Line angles and point angles
3 .Depressions and Elevations on teeth
4 .Division in thirds
Objectives
The prime objective of this lecture is to introduce the dental terminology and its application
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Learning nomenclature is the first and very Learning nomenclature is the first and very important step in understanding dental anatomy. important step in understanding dental anatomy.
Crown is covered with enamel and root is covered Crown is covered with enamel and root is covered with cementum. The crown and root join at the with cementum. The crown and root join at the cemento-enamel junction (CEJ) which is also called cemento-enamel junction (CEJ) which is also called the cervical line. The junction of cementum and the cervical line. The junction of cementum and dentine is called cemento-dentinal junction. The dentine is called cemento-dentinal junction. The junction of dentine and enamel is called junction of dentine and enamel is called dentinoenamel junction (DEJ).dentinoenamel junction (DEJ).
To study and facilitate communication various To study and facilitate communication various surfaces of teeth are recognized and given names.surfaces of teeth are recognized and given names.
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Surfaces of teethSurfaces of teethCrowns of all teeth have five surfacesCrowns of all teeth have five surfaces..
11 . .Facial SurfaceFacial Surface
Facial surface can be labial surface or buccal Facial surface can be labial surface or buccal surfacesurface..
a. Labial surface.a. Labial surface. The surfaces of incisors and The surfaces of incisors and canines that are towards the lipcanines that are towards the lip..
b. Buccal surface.b. Buccal surface. The surfaces of premolars and The surfaces of premolars and molars that face the cheekmolars that face the cheek..
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22 . .Lingual Surface (Palatal surface)Lingual Surface (Palatal surface)All surfaces facing towards the tongueAll surfaces facing towards the tongue..
palatal
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33 . .Proximal SurfacesProximal Surfaces
a. Mesial Surfacea. Mesial SurfaceAll surfaces towards the midlineAll surfaces towards the midline..
b. Distal Surfaceb. Distal SurfaceAll surfaces away from the midline. Mesial surface All surfaces away from the midline. Mesial surface and Distal surface are collectively called and Distal surface are collectively called proximal proximal surfacesurface..
Proximal surfaces
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44 . .Incisal or Occlusal surfaceIncisal or Occlusal surface
a. Incisal surface.a. Incisal surface. The surface of incisors and canines that come in contact with those The surface of incisors and canines that come in contact with those in the opposite jaws during the act of closure are called incisal surfacesin the opposite jaws during the act of closure are called incisal surfaces
b. Occlusal surface.b. Occlusal surface. The surface of premolars and molars that come in contact with The surface of premolars and molars that come in contact with those in the opposite jaws during the act of closure are called occlusal surfacesthose in the opposite jaws during the act of closure are called occlusal surfaces..
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Maxillary Arch
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Mandibular Arch
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43 2
1 1
1 .Labial surface
2 .Mesial surface
3 .Distal surface
4 .Incisal surface
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3
3
3
2 1
1 .Buccal surface2 .Lingual
surface3 .Occlusal
surface
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Line and Point anglesLine and Point anglesWhen two of these surfaces meet, a When two of these surfaces meet, a
line angle is formed and when three line angle is formed and when three surfaces meet a point angle is surfaces meet a point angle is formedformed
Line angle
Point angle
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Line angles of anterior teethLine angles of anterior teeth1. Mesio labial1. Mesio labial2. Disto labial2. Disto labial3. Mesiolingual3. Mesiolingual4. Distolingual4. Distolingual
55 . .LabioincisalLabioincisal66 . .LinguoincisalLinguoincisal
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Line angles of Anterior teeth
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Line angles of posterior teeth
1 .Mesiobuccal
2 .Distobuccal
3 .Mesiolingual
4 .Distolingual
5 .Mesio-occlusal
6 .Disto-occlusal
7 .Bucco-occlusal
8 .Linguo-occlusal
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Line angles of Posterior teeth
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Point angles of anterior teethPoint angles of anterior teeth
1.1. MesiolabioincisalMesiolabioincisal
2.2. DistolabioincisalDistolabioincisal
3.3. MesiolinguoincisalMesiolinguoincisal
4.4. DistolinguoincisalDistolinguoincisal
Point angles of Anterior teeth
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Point angles of posterior teethPoint angles of posterior teeth
1.1. Mesiobucco-occlusalMesiobucco-occlusal
2.2. Distobucco-occlusalDistobucco-occlusal
3.3. Mesiolinguo-occlusalMesiolinguo-occlusal
4.4. Distolinguo-occlusalDistolinguo-occlusal
Point angles of Posterior teeth
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Depressions on tooth surfaceDepressions on tooth surface
11 . .Pit. Pit. A sharp pinpoint depression on the surface A sharp pinpoint depression on the surface of the enamelof the enamel
22 . .FossaFossa. An irregular depression or concavity on . An irregular depression or concavity on the surface of a tooththe surface of a tooth..
21
1 .Pit2 .Fossa
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33 . .SulcusSulcus. A long depression on the surface of a . A long depression on the surface of a toothtooth..
4. Groove4. Groove is a shallow linear depression on the is a shallow linear depression on the surface of a tooth. surface of a tooth.
A A developmental groovedevelopmental groove is a shallow groove or is a shallow groove or line between the primary parts of the crown or line between the primary parts of the crown or root. root.
A A supplemental groove supplemental groove is less distinct and does is less distinct and does not mark the junction of primary parts.not mark the junction of primary parts.
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1
1 .Developmental grooves
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Elevations on tooth surfaceElevations on tooth surface
11 . .CuspCusp. An elevation or mound on the crown of a . An elevation or mound on the crown of a toothtooth..
C
C
C
C
C
Cusps
C
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2. Cingulum 2. Cingulum is the lingual lobe of an anterior tooth is the lingual lobe of an anterior tooth and makes up the bulk of the cervical third of the and makes up the bulk of the cervical third of the lingual surface.lingual surface.
C
Cingulum
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3. Lobe3. Lobe is one of the primary sections of formation in is one of the primary sections of formation in the development of the crown. Cusps and mamelons the development of the crown. Cusps and mamelons are representative of lobes.are representative of lobes.
4. Mamelons4. Mamelons are three rounded protuberances found are three rounded protuberances found on the incisal ridges of newly erupted incisor teeth.on the incisal ridges of newly erupted incisor teeth.
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RidgeRidge. A linear elevation on the surface of a tooth. A linear elevation on the surface of a tooth
Marginal ridgesMarginal ridges are rounded borders of enamel that are rounded borders of enamel that form the mesial and distal margins of the occlusal form the mesial and distal margins of the occlusal surfaces of posterior teeth and the mesial and distal surfaces of posterior teeth and the mesial and distal margins of the lingual surfaces of anterior teeth.margins of the lingual surfaces of anterior teeth.
Triangular ridgeTriangular ridge is a ridge that descends from the is a ridge that descends from the tips of the cusps of molars and premolars towards tips of the cusps of molars and premolars towards the centre part of the occlusal surface.the centre part of the occlusal surface.
Transverse ridge Transverse ridge is formed by the union of buccal is formed by the union of buccal and lingual triangular ridgesand lingual triangular ridges..
Oblique ridgeOblique ridge is a ridge obliquely crossing the is a ridge obliquely crossing the occlusal surfaces of maxillary molars.occlusal surfaces of maxillary molars.
Dr.Syed Sadatullah Ibnsina Dr.Syed Sadatullah Ibnsina National Medical CollegeNational Medical College
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1 .Marginal ridge2 .Triangular ridge
3 .Oblique ridge
1
1
2
2
3 1
1
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Occlusal aspect of Maxillary Molar
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Occlusal aspect of Mandibular Molar
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Other important termsOther important termsMid line.Mid line. An imaginary line dividing the upper and An imaginary line dividing the upper and lower arches into two equal halveslower arches into two equal halves..
Anterior.Anterior. Pertaining to or towards the front plane of the Pertaining to or towards the front plane of the bodybody..
Posterior.Posterior. Pertaining to or towards the back plane of Pertaining to or towards the back plane of the bodythe body..
Superior. Superior. Situated above another or towards the headSituated above another or towards the head..
Inferior.Inferior. Situated beneath another or towards the feet Situated beneath another or towards the feet..
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Anterior Teeth
Posterior Teeth
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Division in thirdsDivision in thirdsTo make study and communication easier the crown To make study and communication easier the crown and root are divided into three halvesand root are divided into three halves..
Division in thirds occluso-gingivally (Crown)Division in thirds occluso-gingivally (Crown)
11 . .Cervical thirdCervical third
22 . .Middle thirdMiddle third
33 . .Incisal/Occlusal thirdIncisal/Occlusal third incisal
Middle
cervical
cervical
Occlusal
Middle
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Division in thirds facio-lingually (Crown)Division in thirds facio-lingually (Crown)
Crown when viewed from frontCrown when viewed from front
11 . .Mesial thirdMesial third
22 . .Middle thirdMiddle third
33 . .Distal thirdDistal third
Distal
Middle
Mesial
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Mesial
Middle
Distal
M D
Mesial
Middle
Distal
M D
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Division in thirds facio-lingually (Crown)Division in thirds facio-lingually (Crown)Crown when viewed from the sideCrown when viewed from the side
11 . .Facial thirdFacial third
22 . .Middle thirdMiddle third
33 . .Lingual thirdLingual third
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Division in thirds-rootDivision in thirds-root11 . .Cervical thirdCervical third
22 . .Middle thirdMiddle third
33 . .Apical thirdApical third
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A
M
C
AA
M M
C
C – CervicalM – MiddleA – Apical