After the registration of the maxillo-mandibular , the artificial teeth must be set in centric occlusal position.
Selecting of artificial teeth
The facial form of the patient should be classified into-
–square
–ovoid
– tapering
-The form of the teeth should be in harmony with the form of the face, square teeth are used for those with a square face and so on.
-In addition, the patient’s age, gender and personality should be taken into consideration when trying to improve to improve the appearance.
-The color is also important, dark and opaque teeth should be selected for elderly patient, light and translucent teeth for the young patients.
-The size of the teeth must also be in harmony according to the size of the face and the gender of the patient.
Objectives of setting teeth are-
to provide a comfortable and atraumatic occlusion
to assist in preparing food for deglutition
to impart a pleasing and natural appearance
to assist in speech
Teeth arrangement of anteriors and posteriors
Armamentarium
•Maxillary occlusal rim with cast
• Mandibular occlusal rim with cast
• Mean value articulator
• Teeth shade
• Measurement scale
• Wax knife
• Roach carver
• Wax spatula
• Wax sheet
• Gas torch
• Cotton
• Rubber bowl with cold water
Guidelines for anterior teeth setting are marked on the cast and the land area of the cast.
I. The centre of the incisive papilla (marked in red)
II. A line is drawn along the midline of the cast through the centre of the incisive papilla (marked in black).
III. A perpendicular line is drawn to the above line through the centre ofincisive papilla till the land area (marked in blue; CPC line).
IV. During setting of maxillary canine, the cuspid tip of the canine should be placed in line with this point
The crest of the lower residual alveolar ridge is marked in red colour along the posterior aspect of the lower cast. A corresponding line is marked on the upper cast in blue
Steps in placement of maxillary central incisor
Placement of the maxillary central incisor in relation to all three planes.
🔻The long axis of the central incisor (the blue line) is positioned parallel to the
vertical axis (the red line) when viewed from the front
Front view
🔻The incisal edge of the maxillary central incisor is positioned in line with the
anterior occlusal plane . The central pin of the articulator will point the mesioincisal line edge of the central incisor.
Side view
🔻The central pin of the articulator will
point the mesioincisal line edge of the central incisor.
When viewed from:
Front: Long axis parallel towards the vertical axis.
Side: Slopes labially about 15 degrees.
Occlusal plane: Incisal edge is in contact with occlusal plane
Occlusal view
Steps in placement of maxillary lateral incisor
Front view
🔻The long axis of the lateral incisor (green line) is placed slightly inclined tothe vertical axis (red line). 🔻The incisal edge of the maxillary lateral incisor is placed slightly short of the
occlusal plane (marked as yellow line).