CIVL102 Surveying and Surveying Camp CIVL102 Surveying and Surveying Camp.
Surveying maxillary cast Mark the ideal survey lines.
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Transcript of Surveying maxillary cast Mark the ideal survey lines.
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Surveying maxillary cast
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Mark the ideal survey lines
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Tooth modifications
1. Contour modifications2. Guide planes3. Rest seats
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DISTAL VIEW OF DISTAL & LINGUAL GUIDING PLANE ON A
CUSPID.
LINGUAL LABIAL
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DISTAL VIEW OF LINGUAL ANDDISTAL GUIDING PLANES.
LINGUAL BUCCAL
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LINGUAL VIEW OF DISTAL & LINGUALGUIDING PLANES.
MESIAL DISTAL
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Buccal View of Distal Guiding Plane
DISTAL MESIAL
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RESTS
Prevent vertical movement of partial into tissue
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The term rest designates any component of the framework that is placed on a tooth. It must be in a PREPARED REST SEAT. It limits the movement of the prosthesis in a gingival direction and transmits forces to the long axis of the teeth.
Contact on a tooth surface incline without a rest seat could result in tooth movement converting the RPD to an ORTHODONTIC APPLIANCE.
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1o SUPPORT
RestsTransmits forces through long axis of
toothTransmits forces through periodontal
ligamentStabilizes against rotational forces
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Rest seats can be located on the occlusal and incisal sufaces of a tooth as well as the cingulum and in some instances the marginal ridges of canines.
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REST AREA - REST SEAT
1 That portion of the tooth selected and prepared to receive an occlusal, incisal, marginal ridge or cingulum / lingual rest.
2 The portion of the tooth structure or of a restoration in a tooth prepared so it is spoon shaped on posterior teeth and V, U or hook-shaped on some anterior teeth, into which seats the metallic rest of a removable partial denture framework.
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DESIGN CHARATERISTICS OF RESTS
1. Large enough to fit a casting to2. Forms acute angles with minor connectors -
prevents tooth from moving away frompartial
3. Does not interfere with occlusion
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TYPES OF RESTS
1. Occlusal
2. Cingulum
3. Incisal
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OCCLUSAL RESTS
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Maxillary premolar
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Mandibular First Premolar
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Occlusal Rests
Rounded triangular shape-”teaspoon” Approximately one-third width of tooth Marginal ridge should be lowered to permit
bulk of metal for strength. Floor of rest apical to marginal ridge. No sharp edges or line angles. Angle formed by minor connector and rest
should be less than <ninety degrees.
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Definitive rest
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CINGULUM RESTS
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Mandibular Cingulum Rests
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Cingulum Rest-Restoration-Natural tooth
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Cingulum Rests
Most effective on maxillary canines.Slightly rounded inverted “V” shape.When mandibular canines / incisors are
utilized a rounded ledge at the level of the cingulum can serve as a rests.
Care must be taken to avoid enamel undercuts.
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INCISAL REST
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Incisal Rests
Prepared in form of rounded notch at incisal angle of canine or incisal edge of incisor.
Should be approximately 2.5 mm wide and 1.5 mm deep.
Notch is beveled both labially and lingually.
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Marginal Ridge Rest
45o
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Bonded Resin Cingulum Rest
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