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level: SURVEYING AND REST SEAT PREP

Questions and Answers List

level questions: SURVEYING AND REST SEAT PREP

QuestionAnswer
SURVERYING - Important to the ________ of appropriate mouth modifications (meaning tooth reduction but very minimal) for a removable partial dentureplanning, execution, and verification
SURVERYING - It is critical for planning the modifications of all tooth surfaces that will be involved with the ________ of the prosthesissupport, stabilization, and retention
An instrument used to determine the relative parallelism of two or more surfaces of the teeth or other parts of the cast of a dental archdental surveyor
widely used because of its simplicity and durabilityNey
2 most widely used surveyors:ney and jeleko
Parts of Ney Surveyor1. Tool compartment/ Mandrel 2. Compartment lid 3. Vertical Arm 4. Horizontal arm 5. Survey table 6. Platform/Base 7. Rack for accessories 8. Paralleling tool or guideline marker 9. **collet and tightening knob-spindle
Parts of the survey Table1. Tilt top (pinaglalagyan), model clamp-3, adjusting screw 2. Locking screw of tilt top 3. Ball pivot
Tools in surveyor1. Metal sheath with carbon marker 2. Paralleling tool 3. Undercut gauges 4. Blades
Difference of Ney from Jelenko✓ Has spring at the spindle knob ✓ Horizontal arm can be moved ✓ Smaller collet
Purposes of surveyor1. Surveying the diagnostic cast 2. Contour wax patterns 3. Measuring specific depth of undercut 4. Surveying ceramic veneer crowns (FPD) 5. Placing intracoronal retainers
Objectives of surveying:1. To determine the most desirable path of placement and removal 2. To identify the guiding planes 3. Locate retention areas (usable undercuts) 4. Determine tooth and bony interferences (soft tissue also have undercuts) 5. Delineate height of contour on abutment tooth 6. Record cast position in relation to selected path of placement
types of undercutusable and nonusable
FACTORS THAT DETERMINE THE PATH OF INSERTION AND REMOVALguiding planes, retentive areas, esthetics, interference
REST ➢ Primary purpose:Provides vertical support
REST; other purposes1. Maintains components in their planned positions 2. Maintains established occlusal relationships by preventing settling of denture 3. Prevents impingement of soft tissue 4. Direct and distributes occlusal loads to abutment teeth 5. Acts as an indirect retainer
OCCLUSAL REST SEAT ➢ Outline from:ROUNDED TRIANGULAR
The base of the triangular shape (at the marginal ridge) should be at least ___ for both molars and premolars2.5 mm
_____is lowered to provide bulk and to accommodate the origin of the occlusal rest with the least occlusal interferenceMarginal ridge
The angle formed by the occlusal rest and the vertical minor connector from which it originates should be ____ degreesless than 90
TRUE OR FALSE: Rest seat preparation can be exaggerated for better support when it is prepared in cast restorationTRUE
Least desirable placement of a rest seat for esthetic reasons it can be used successfully to selected patients of the abutment is sounds and when a cast restoration is not indicatedINCISAL REST
An incisal rest seat is prepared in the form of a ____ at the incisal angle of a canine or on the incisal edge of an incisor, with the deepest portion of the preparation apical to the incisal edgerounded notch
REST-More advisable in Mn caninesincisal rest
In the absence of suitable placement rest and rest seats. Incisal rest on multiple Mn incisors maybe considered, use of such rest maybe justified by the following factors:1. Anterior guidance 2. Additional stability 3. Such rest can restore defected or abraded teeth