Implant Design & Fabrication Flashcards
7 cards from real CIT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Implant Design & Fabrication flashcards as text
During CAD/CAM milling of a zirconia implant crown, which milling strategy best minimizes chipping along occlusal margin edges?
Answer: Wet milling with dedicated zirconia milling burs at controlled feed rates
Wet milling with specific zirconia burs at controlled feed rates reduces heat generation and micro-fractures that cause chipping at fine margins.
Which implant system component requires the most precise torque specification to prevent both loosening under function and screw fracture?
Answer: Abutment retention screw at final restoration delivery
The abutment retention screw at final delivery requires manufacturer-specified torque (typically 25-35 Ncm) to achieve optimal preload without fracture risk.
A patient presents with a thin biotype and high smile line requiring an anterior implant crown. Which abutment material will best mask a gray shadow through the tissue?
Answer: Zirconia white ceramic
Zirconia abutments are tooth-colored and do not transmit the gray metallic hue through thin peri-implant mucosa, preserving esthetic outcomes.
When designing an implant-supported fixed partial denture (FPD) framework, which connector cross-sectional area is generally recommended to ensure adequate strength in metal-ceramic restorations?
Answer: At least 9 mm²
A minimum connector cross-sectional area of 9 mm² (3mm x 3mm) is the standard recommendation for metal-ceramic implant FPD frameworks to resist fracture.
The 'indexing' feature (anti-rotation) of implant abutments is most critical in which prosthetic scenario?
Answer: Single-tooth implant restorations to prevent crown rotation under lateral forces
Anti-rotational features are essential for single-tooth restorations because there is no adjacent crown or splinting to resist rotational forces on the abutment.
In immediate implant placement protocol, which implant macro-design feature is most critical for achieving adequate primary stability in an extraction socket?
Answer: Apical self-tapping cutting flutes engaging native bone beyond the socket apex
Self-tapping apical flutes allow the implant to engage native bone 3-5mm beyond the socket apex, achieving primary stability independent of the socket walls.
Which sintering temperature range is used to fully densify pre-sintered zirconia blanks in CAD/CAM implant prosthetics?
Answer: 1350–1550°C
Zirconia is fully sintered at 1350–1550°C, which transforms it from the pre-sintered chalk-like state to its final high-density, high-strength ceramic.