Arranging the Posterior Teeth
A portion of wax is removed, the wax softened and the maxillary first premolar is placed in position
The facial surface of the maxillary first premolar is on the occlusal plane and the lingual cusp is raised off the plane approximately 0,5 mm
The lingual cusp is over the line on the occlusion rim which represents the crest of the mandibular ridge
The facial and lingual cusps of the maxillary second premolar touch the occlusal plane
The lingual cusp is over the crest of the ridge
Only the mesiolingual cusp of the maxillary first molar touches the occlusal plane and the lingual cusps are over the crest of the mandibular ridge
No cusp of the maxillary second molar touches the occlusal plane.
The facial cusps of the maxillary teeth form a gentle curve, while the lingual cusps form a similar curve aboutt 0,5 mm below the facial cusp
Mandibular first molar, mandibular second molar are set in centric occlusion
The placement of the mandibular posterior teeth determines how will the teeth occlude.
In centric occlusion, the facial cusps of the mandibular teeth contact the central fossae of the maxillary teeth while the lingual cusps of the maxillary teeth fit into he central fossae of the mandibular teeth.
The facial cusps of the maxillary teeth extend beyond the facial surfaces of the mandibular teeth. This facial overlap prevents cheek-biting when the dentures are completed
Factors of Occlusion
Condylar Guidance: the path the condyle follows in the temporomandibular joint at the different function of the mouth
Cusp Height: The shortest distance between the deepest part of the central fossa of a posterior tooth and a line connecting the points of the cusps of a tooth
Incisal Guidance: The angle formed with the horizontal plane by drawing a line in the sagittal plane between the incisal edges of the maxillary and the mandibular central incisors when the teeth are in centric occlusion
The Compensating Curve: The anterior-posterior curvature of the occlusal surface of a complete denture. The compensating curve corresponds to the curve of Spee, which is an anatomical curve present in the natural dentition
The Occlusal Plane: An imaginary surface that is related anatomically to the cranium and that theoretically touches the incisal edges of the incisors and the tips of the occluding surfaces of the posterior teeth.
Centric Relation: Relationship of the mandible to the maxilla when the properly aligned condyle disk assemblies as in most superior, back and middle position against the condylar fossa
Centric Relation: Relationship of the mandible to the maxilla when the properly aligned condyle disk assemblies as in most superior, back and middle position against the condylar fossa
Centric Occlusion: Refers to the relationship of the mandible to the maxilla when the teeth are in maximum occlusal contact
