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23 Cards in this Set
- Front
- Back
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Advantages of Convex occlusal surfaces
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Small contact areas allow for efficient crushing
Spillway for food lowers resistance |
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Types of Occlusal contacts
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Point to point
Point to are Edge to edge Edge to area NEVER Area to Area |
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Bruxism
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Parafunctional habit
-Patients grinding teeth & flattening cusps -No spillway -Leads to area to area contact -Mandibular excursive movement made with teeth held together |
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Two Kinds of cusps are found on?
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Supporting, working, centric holding, or functional
Max - Lingual Mand- Buccal Guiding - Max - Buccal Mand - Lingual |
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Two types of cusps & characteristics
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Supporting - Rounder, located more towards center of tooth, Keep tooth position in centric, Holds vertical dimension
Guiding - More towards outside, contact occurs on lateral excursion, sharper |
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Advantages of Convex occlusal surfaces
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Small contact areas allow for efficient crushing
Spillway for food lowers resistance |
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Types of Occlusal contacts
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Point to point
Point to are Edge to edge Edge to area NEVER Area to Area |
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Bruxism
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Parafunctional habit
-Patients grinding teeth & flattening cusps -No spillway -Leads to area to area contact -Mandibular excursive movement made with teeth held together |
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Two Kinds of cusps are found on?
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Supporting, working, centric holding, or functional
Max - Lingual Mand- Buccal Guiding - Max - Buccal Mand - Lingual |
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Two types of cusps & characteristics
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Supporting - Rounder, located more towards center of tooth, Keep tooth position in centric, Holds vertical dimension
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4 Characteristics of occlusal table
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-Formed by inner inclines of buccal and lingual cusps
-Bucco-occlusal & Lingual-occlusal lines divide buccal and lingual cusps into inner incline & outer incline -Located over center of roots -50-60% of Buccal - Lingual width of tooth |
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Occlusal contacts in centric occlusion
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Every centric holding cusp occludes with proximal ridges except ML cusp of maxillary molars and DB cusp of mandibular molars
They occlude in central fossa of class counterpart |
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Overjet
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Horizontal overlap - Distance between labial surface of maxillary anterior teeth to mandibular teeth
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Overbite
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Vertical Overlap - Distance between incisal edges of maxillary and mandibular teeth
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Angles classification of Occlusion
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Class I - Tip of Maxillary canine between mandubilar canine & first premolar MB cusp of maxillary molars coincides with MB groove of mandibular molars
Class II - Everything is mesial Class III - Everything is buccal |
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Characteristic of protrusive movement
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- Symmetrical
-Incisal edge of mand incisors glide on lingual surface of maxillary incisors till they reach edge to edge |
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Occlusal contacts in protrusive movement
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-Posterior teeth should not contact
-Atleast 2 pairs of anterior teeth should contact |
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Premature contacts in protrusive position
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Only one pair of anterior teeth contact
Posterior teeth contact |
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Lateral excursion Movements
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Working movement
Balancing movement |
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Occlusal contacts in Working position
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Cuspid guidance - Only max & mand canines make contact on working side as mand moves laterally
Anterior guidance - Canines, lateral & sometimes central incisors make contact as mandible moves laterally Group Function - All anterior & posterior teeth on working side make contact as mandible moves laterally |
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Occlusal contacts on balancing side
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Normally there is no contact on balancing side
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Premature contacts in lateral excursion
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-No cuspid contact on working side
-Only one pair of posterior contacts on working side -Balancing side contacts |
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3 movements & their representations on teeth
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Working - Max Buccal, Mand lingual
Balancing - Max Mesiolingual, Mand Distobuccal Protrusive - Max mesial, mand distal |
