ALL Flashcards
Coupled contacts
reciprocal and simultaneous contact of opposing supporting cusps in ICP. Important for stability
Intercuspal position
Position of maximal intercuspation between mandibular and maxillary teeth. Also termed centric occlusion
Arch form relationship of mandibular supporting cusps
Premolar buccal and molar MB cusps make marginal ridge (occlusal embrasure) contacts called dipod contacts (D). The DB cusps of mandibular molars make fossa contacts called tripod contacts.
Arch form relationship of maxillary supporting cusps
Premolar lingual cusps make fossa contacts in the distal fossa of the opposing mandibular molar.
Molar ML cusps make fossa contacts in the central fossa of opposing mandibular molar (tripod).
Major supporting cusp of maxillary molars
ML
Major supporting cusp of mandibular molars
MB (+DB)
Requirements for ICP stability
- Well-distributed posterior contacts
- Coupled contacts between opposing teeth
- Overall tripoding of each tooth (distribution of forces)
Excursive guidance
pattern of apposing tooth contact during excursive movements
Disclusion
separation of contacting teeth
Interference
Overly large ICP or excursive contact that prevents other teeth from contacting
May be from a high filling or an overly long incisal edge
Wear facet
worn or shiny area at the site of heavy contact on a restoration of natural tooth
Types of guidance in lateral movements
- Canine guidance
- Canine segment guidance
- Group function
Described by the teeth in contact
Tooth angle classification is based on
1st molars from the facial view
Canines when 1st molars are missing
Angle Class 1
MB cusp of maxillary 1st aligns with the buccal groove of the mandibular 1st molar
Angle Class 2
MC cusp of the maxillary 1st molar aligns mesial to the buccal groove of the mandibular 1st molar
