Terminology Anatomical Landmarks

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Terminology Anatomical Landmarks Powered By Docstoc
					                                        Dentition
       • The term dentition refers to the general arrangement of teeth; certain teeth are
         located in specific areas of the mouth and the teeth will come into contact in a
         very specific manner.

Dentitions:
There are 3 types of dentition that may be present:
       • Deciduous dentition
       • Permanent dentition
       • Mixed dentition
Deciduous Dentition
      • This dentition contains the primary or baby teeth
      • These teeth are lost when the permanent teeth are ready to erupt
      • There are 20 deciduous teeth in the mouth; there are 10 deciduous teeth per arch

Permanent Teeth
     • These teeth are the adult teeth; they are also called secondary teeth
     • These teeth begin erupting at age 6
     • There are 32 permanent teeth in the mouth; not everyone will have 32, some
       teeth may be missing; there are 16 permanent teeth per arch

Mixed Dentition
      • If a patient has both permanent and primary teeth present, they have what is
        called a mixed dentition
      • Mixed dentitions are typically seen in patients that are between the ages of 6 to
        13

Mouth Divisions:
     The mouth can be divided into sections:
     • Arches (there are 2 arches present)- an arch will divide the mouth into top and
       bottom
     • Quadrants (there are 4 quadrants present)- a quadrant divides an arch into right
       and left
       These divisions refer to both the primary and permanent dentitions.

       Maxillary Arch
       • This is the top arch or jaw
       • The maxillary arch contains 16 permanent teeth
       • The maxillary arch contains 10 primary teeth
       • The maxillary arch contains 2 quadrants

       Mandibular Arch
       • This is the bottom arch or jaw
       • The mandibular arch contains 16 permanent teeth
       • The mandibular arch contains 10 primary teeth
       • The mandibular arch contains 2 quadrants
       The mouth will have 4 Quadrants:
       • MX right (quadrant 1)   MX left (quadrant 2)
       • MD right (quadrant 3)   MD left (quadrant 4)
                                     divided by a midline (the midline refers to an
                                     imaginary line that divides the mouth into right and
                                     left halves)

Names of Teeth:
   If you look in your mouth, you will notice that the teeth in the front of the mouth
      look different than the teeth in the back of the mouth. This is because there are
      different types of teeth in the mouth.

       1 Anterior teeth
             • These are the teeth in the front of the mouth
             Names of the anterior teeth:
                       central incisors
                       lateral incisors
                       canines
       2 Posterior teeth
             • These are the teeth in the back of the mouth
             Names of the posterior teeth:
                        premolars
                        molars
Deciduous Dentition
      The following teeth are present in each quadrant of a deciduous dentition:
                primary central incisors
                primary lateral incisors
                primary canines
                primary first molars
                primary second molars
       Note:
                  there are no premolars present within the deciduous dentition; primary
                   molars are present!

Tooth Numbers:
      • Teeth are given numbers as a way to identify them

       Permanent dentition-          Maxillary or top arch contains tooth numbers 1 - 16
                                     Mandibular arch contains tooth numbers 17 – 32

       Primary dentition-            Maxillary arch contains tooth letters A - J
                                     Mandibular arch contains tooth letters K - T
Permanent Tooth Numbers:
     Maxillary Tooth Numbers:
           •   Tooth #1         MX Right 3rd Molar
           •   Tooth #2         MX Right 2nd Molar
           •   Tooth #3         MX Right 1st Molar
           •   Tooth #4         MX Right 2nd Premolar
           •   Tooth #5         MX Right 1st Premolar
           •   Tooth #6         MX Right Canine
           •   Tooth #7         MX Right Lateral Incisor
           •   Tooth #8         MX Right Central Incisor
           •   Tooth #9         MX Left Central Incisor
           •   Tooth #10        MX Left Lateral Incisor
           •   Tooth #11        MX Left Canine
           •   Tooth #12        MX Left 1st Premolar
           •   Tooth #13        MX Left 2nd Premolar
           •   Tooth #14        MX Left 1st Molar
           •   Tooth #15        MX Left 2nd Molar
           •   Tooth #16        MX Left 3rd Molar

     Mandibular Tooth Numbers:
           •   Tooth #17        MD Left 3rd Molar
           •   Tooth #18        MD Left 2nd Molar
           •   Tooth #19        MD Left 1st Molar
           •   Tooth #20        MD Left 2nd Premolar
           •   Tooth #21        MD Left 1st Premolar
           •   Tooth #22        MD Left Canine
           •   Tooth #23        MD Left Lateral Incisor
           •   Tooth #24        MD Left Central Incisor
           •   Tooth #25        MD Right Central Incisor
           •   Tooth #26        MD Right Lateral Incisor
           •   Tooth #27        MD Right Canine
           •   Tooth #28        MD Right 1st Premolar
           •   Tooth #29        MD Right 2nd Premolar
           •   Tooth #30        MD Right 1st Molar
           •   Tooth #31        MD Right 2nd Molar
           •   Tooth #32        MD Right 3rd Molar
Primary Tooth Letters:
       Maxillary Tooth Letters
            •    Letter A               MX Right Primary 2nd Molar
            •    Letter B               MX Right Primary 1st Molar
            •    Letter C               MX Right Primary Canine
            •    Letter D               MX Right Primary Lateral Incisor
            •    Letter E               MX Right Primary Central Incisor
            •    Letter F               MX Left Primary Central Incisor
            •    Letter G               MX Left Primary Lateral Incisor
            •    Letter H               MX Left Primary Canine
            •    Letter I               MX Left Primary 1st Molar
            •    Letter J               MX Left Primary 2nd Molar
            •    Letter K               MD Left Primary 2nd Molar
            •    Letter L               MD Left Primary 1st Molar
            •    Letter M               MD Left Primary Canine
            •    Letter N               MD Left Primary Lateral Incisor
            •    Letter O               MD Left Primary Central Incisor
            •    Letter P               MD Right Primary Central Incisor
            •    Letter Q               MD Right Primary Lateral Incisor
            •    Letter R               MD Right Primary Canine
            •    Letter S               MD Right Primary 1st Molar
            •    Letter T               MD Right Primary 2nd Molar


Tooth Surfaces
      • the crown or portion of the tooth that you can see when the mouth is open, are
        divided into surfaces
      • these surfaces are named according to the direction in which they face
       Mesial
                 • this surface is closest to the midline
       Distal
                 • this surface is farthest from the midline
       Facial
                 • designates the outer surface of an anterior tooth
                 • is also called Labial
       Buccal
                 • designates the outer surface of a posterior tooth
       Lingual
                 • the surface of the tooth that is towards the tongue or roof of the mouth
                 • Palatal- term used for maxillary teeth
       Occlusal
                 • biting or occluding surfaces of posterior teeth
       Incisal
                 • “biting” surface of anterior teeth