1.Guided by: facial surfaces of mandibular incisors contacting lingual surfaces of maxillary incisors
Retrusion
movement posteriorly
Laterotrusion:
movement laterally
Working side
Latertrusion side
side of the mandible moving away from the midline
Mediotrusive side
Non-working Side
lateral movement towards midline
Interference
an overly large ICP or excusive contact that prevents other teeth from contacting
i.“high” filing
ii.Overly long incisal edge
Wear Facet:
worn or shiny area at the site of heavy contact on a restoration or natural tooth
i.Natural tooth becomes flat
Canine Guidance
teeth are guided out of occlusion through contact between opposing canines
Canine-Segment Guidance
deals with canine and 1st premolars; canines and adjacent teeth guide arches out of occlusion
Group Function
a group of teeth touching; multiple teeth contact during laterotrusion
Curve of Spee
curvature, viewed from the facial, that begins at the canine cusp tips and follows the buccal cusp tips of the premolars and molars posteriorly
b.Upward curvature as you go posteriorly
Clinical Applications of Protrusive Guidence
Optimal placement of cusps during wax-ups of indirect restorations
Occlusal adjustment during placement of a restoration
Interpretation of wear facets on a newly placed restoration
Evaluation of bruxism(clench/grinding) habits from pattern of tooth wear
Laterotrusive pathways
perpendicular to the central fossa line
correspond to the lingual grooves of mandibular molars and buccal grooves of maxillary molars
Mediotrusive pathways
oblique to the central fossa line
correspond to DL groove of maxillary molars and DB groove of the mandibular first molar.
parallel “oblique anatomical features” of each molar, including the distobuccal groove of the mandibular molar and the oblique ridge of the maxillary first molar.
maxillary diagram
mandibular movement is in the direction of the arrow
mandibular diagram
mandibular movement is opposite the direction of the arrow
