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Surveying maxillary cast Mark the ideal survey lines.

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Presentation on theme: "Surveying maxillary cast Mark the ideal survey lines."— Presentation transcript:

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2 Surveying maxillary cast

3 Mark the ideal survey lines

4 Tooth modifications 1. Contour modifications 2. Guide planes 3. Rest seats

5 DISTAL VIEW OF DISTAL & LINGUAL GUIDING PLANE ON A CUSPID. LINGUALLABIAL

6 DISTAL VIEW OF LINGUAL AND DISTAL GUIDING PLANES. LINGUALBUCCAL

7 LINGUAL VIEW OF DISTAL & LINGUAL GUIDING PLANES. MESIALDISTAL

8 Buccal View of Distal Guiding Plane DISTALMESIAL

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10 RESTS Prevent vertical movement of partial into tissue

11 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.

12 1 o SUPPORT Rests Transmits forces through long axis of tooth Transmits forces through periodontal ligament Stabilizes against rotational forces

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14 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.

15 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.

16 DESIGN CHARATERISTICS OF RESTS 1. Large enough to fit a casting to 2. Forms acute angles with minor connectors - prevents tooth from moving away from partial 3. Does not interfere with occlusion

17 TYPES OF RESTS 1. Occlusal 2. Cingulum 3. Incisal

18 OCCLUSAL RESTS

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25 Maxillary premolar

26 Mandibular First Premolar

27 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

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29 Definitive rest

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31 CINGULUM RESTS

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37 Mandibular Cingulum Rests

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41 Cingulum Rest -Restoration -Natural tooth

42 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.

43 INCISAL REST

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48 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.

49 Marginal Ridge Rest 45 o

50 Bonded Resin Cingulum Rest

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