Surveyors Flashcards
What is the function of the surveyor?
Paralleling instrument, designed to select the most favourable path of insertion and to aid in preparation of guiding planes.
What is the function of the analyzing rod?
It is used to determine the relative parallelism of axial surfaces, analyzing contours, and undercut areas without marking the cast.
What is the function of the carbon marker?
Mark the height of contour of the teeth on surfaces of the dental cast
What is the function of he undercut guages?
Identify position of desired undercuts on casts.
What is the function of the surveyor blade?
Adjust height of contour by trimming stone tooth.
What is the function of the wax knife?
Used during blockout procedures cutting wax and in the construction of surveyed restorations. (preparing guiding planes)
What are the functions of the surveyor?
Determine most favourable path of insertion (Presence of suitable undercuts while eliminating hard and soft tissue interferences) and establishing appropriate guide planes.
Delineate height of contour of supporting teeth
Determine areas of teeth that may be used for the denture retention
Identify proximal tooth surfaces that are parallel so they act as guiding planes during placement and removal (if parallel walls not available we need to create parallel interproximal surfaces)
Assist the relieve of master cast: Shaping and cutting wax.
Placement of precision attachments: Internal and external attachments
Preparation of surveyed crowns
Assist mouth preparation
What structures can produce interferences?
The alvoelar bone (due to slanting of soft tissue
Exostoses
Mandibular tori
What techniques are used for path of placement?
Roach technique: Perpendicular to insertion plane (occlusal plane), defined by 3 points on the model
Bisector/Roth technique: Average inclination of the supporting teeth
Applegate technique: Establish best incline of the cast where the height of contour of supporting teeth is located between gingival and middle third or the position that favours the mouth preparation
What is the limitation of the roach technique?
Long axis of teeth are not perpendicular to the occlusal plane
What is the limitation of the bisector/roth technique?
Can be difficult to get with multiple supporting teeth
What are the limitations of the applegate technique?
Operator experience
Previous planning
