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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 AND

DISTAL GUIDING PLANES.

LINGUAL BUCCAL

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LINGUAL VIEW OF DISTAL & LINGUAL

GUIDING PLANES.

MESIAL DISTAL

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Buccal View of DistalGuiding Plane

DISTAL MESIAL

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RESTS

Prevent vertical movement ofpartial into tissue

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The term rest designates any component ofthe framework that is placed on a tooth. Itmust be in a PREPARED REST SEAT . It

limits the movement of the prosthesis in agingival direction and transmits forces to thelong axis of the teeth.Contact on a tooth surface incline without arest seat could result in tooth movementconverting the RPD to an ORTHODONTIC

APPLIANCE.

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1o SUPPORT

RestsTransmits forces through long axis oftoothTransmits forces through periodontalligament

Stabilizes against rotational forces

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Rest seats can be located on theocclusal and incisal sufaces of a toothas well as the cingulum and in someinstances the marginal ridges ofcanines.

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REST AREA - REST SEAT

1 That portion of the tooth selected andprepared to receive an occlusal, incisal,marginal ridge or cingulum / lingual rest.

2 The portion of the tooth structure or of arestoration in a tooth prepared so it is spoon

shaped on posterior teeth and V, U or hook-shaped on some anterior teeth, into whichseats the metallic rest of a removable partialdenture framework.

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DESIGN CHARATERISTICS OFRESTS

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. Cingulum3. 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 toothMarginal ridge should be lowered to permitbulk of metal for strength.Floor of rest apical to marginal ridge.No sharp edges or line angles.

Angle formed by minor connector and restshould be less than

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Definitive rest

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CINGULUM RESTS

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MandibularCingulum 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 areutilized a rounded ledge at the level ofthe cingulum can serve as a rests.Care must be taken to avoid enamelundercuts.

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INCISAL REST

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Incisal Rests

Prepared in form of rounded notch atincisal angle of canine or incisal edge ofincisor.Should be approximately 2.5 mm wideand 1.5 mm deep.Notch is beveled both labially andlingually.

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Marginal Ridge Rest

45 o

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Bonded Resin Cingulum Rest

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