Prosthodontic & Orthodontic Appliance Fabrication Flashcards
7 cards from real CDT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Prosthodontic & Orthodontic Appliance Fabrication flashcards as text
In orthodontic retainer fabrication, a Thermoplastic (Essix-type) retainer is vacuum-formed over which type of model?
Answer: A stone cast of the patient's teeth in final alignment
Essix-type retainers are vacuum-formed directly over a stone cast representing the patient's final tooth positions to maintain achieved alignment.
What is the primary advantage of zirconia as a core material for all-ceramic crowns compared to alumina?
Answer: Higher flexural strength enabling use in high-stress posterior regions
Zirconia has a significantly higher flexural strength (>900 MPa) than alumina, making it suitable for posterior bridges and high-load restorations where alumina would fracture.
During try-in of a maxillary complete denture wax setup, which landmark determines the posterior limit of the hard palate and helps establish the posterior palatal seal?
Answer: Vibrating line (ah line)
The vibrating line marks the junction between the immovable hard palate and the movable soft palate, defining where the posterior palatal seal (post dam) should be placed.
In RPD design, which major connector is most commonly selected for the maxillary arch when there are multiple missing posterior teeth on both sides?
Answer: Anterior-posterior palatal strap
The anterior-posterior palatal strap (double palatal bar) provides excellent cross-arch stability with minimal palatal coverage, distributing forces effectively in bilateral posterior extension cases.
A dental technician is fabricating a space maintainer for a child who lost a primary first molar prematurely. Which appliance type is most commonly used as a fixed space maintainer in this scenario?
Answer: Band-and-loop space maintainer
The band-and-loop space maintainer is the standard fixed appliance for unilateral primary molar space maintenance, using a band on the adjacent tooth and a loop that prevents mesial drift of the permanent successor.
When selecting artificial teeth for a complete denture patient, which anatomical landmark is used to determine the appropriate width of the anterior teeth?
Answer: Distance between the canine eminences (or outer edges of the nostrils)
The distance between the outer edges of the nostrils (alar width) approximates the inter-canine width, serving as a reliable guide for selecting anterior tooth width in edentulous patients.
What distinguishes a Kennedy Class I removable partial denture from a Kennedy Class II RPD?
Answer: Class I has a bilateral edentulous area posterior to remaining teeth; Class II has a unilateral posterior edentulous area
Kennedy Class I features bilateral distal extension edentulous areas with no posterior abutments; Kennedy Class II features a unilateral distal extension edentulous area.