Tooth Surfaces (VERY IMPORTANT!)
• Facial / Buccal (labial / vestibular)
• Lingual (palatal on max)
• Mesial
• Distal
• Occlusal
• Incisal

Line & Point surfaces

·      Line: 2 surfaces

·      Point: 3 surfaces

Divisions into thirds (cont.)

Root of tooth

• Apical third – look at for infection
• Middle third

• Cervical third- look at to know about good brushing

Crown of tooth

• Occlusal division

• Middle division

• Cervical division (closest to the gingiva)

First place you look at the cervical third to know if they are brushing their teeth.

Top of the root it's in the Apex (apical)

Canine eminence- bony covering over the facial aspect of the canine root

Occlusion and Malocclusion

Occlusion (bite)

Malocclusion (bite is not correct)
• Occlusion: Relationship between maxillary and mandibular teeth when jaws are fully closed – how the teeth come together

• Malocclusion: Abnormal or malpositioned relationships of maxillary teeth to mandibular teeth when they are in centric occlusion (meaning?)

Centric occlusion: Occurs when jaws are closed in a position that produces maximal stable contact between occluding surfaces of maxillary and mandibular teeth- resting bite

Functional occlusion (physiologic occlusion): Contact of the teeth during biting and chewing movements- bite being used

Angles Classification:

·       Used to describe and classify occlusion and malocclusion

·       Basis of the system is that the permanent maxillary first molar is the key to occlusion

·       Assumes that the patient is occluding in a centric position

Classifications -Roman Numerals

•I – one •II – two •III – three •IV – four •V – five •VI – six

Classes of Malocclusion

• Class I (neutroclusion): An ideal mesiodistal relationship exists between the jaws and the dental arches

MB-Mesibuccal

MB cusp of permanent maxillary first molar occludes with mesiobuccal groove of the mandibular first molar

Class II (distoclusion):

Hits ahead of the grove because the mandible is back

Frequently gives the appearance of protrusion of the maxillary anterior teeth over the mandibular anterior teeth

Division 1: Lips are usually flat and parted, with the lower lip tucked behind the upper incisors - “buck tooth”

Division 2: Maxillary incisors are not in labioversion

Class III Malocclusion (Mesioclusion)

Gives appearance of protrusion of the mandible.

Lower jaw is pushed out

Har time biting into things

The curve of Wilson is defined by a line drawn across the occlusal surface of the left mandibular first molar, across the arch, and through the occlusal surface of the right mandibular first molar. How much tipping is from one molar to the bottom – very gradual

The curve of Spee is the maxillary and mandibular arches in occlusion. Slightly curved

Closure: Anterior teeth are not designed to fully support the occlusal forces on the entire dental arch. As the jaws close, the stronger posterior teeth come together first.