Implant Materials & Techniques 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 Materials & Techniques flashcards as text
Laser-Lok surface technology on implant collars is designed to achieve:
Answer: Connective tissue fiber attachment to the implant
Laser-Lok creates precise micro-channels that promote perpendicular connective tissue fiber attachment, forming a biological seal analogous to a natural gingival sulcus.
The modulus of elasticity of titanium (approximately 110 GPa) compared to cortical bone (approximately 17 GPa) creates which clinical concern?
Answer: Stress shielding and crestal bone resorption
The large stiffness mismatch causes titanium to absorb most occlusal load, shielding adjacent bone from functional stress and potentially causing disuse atrophy and crestal resorption.
Demineralized freeze-dried bone allograft (DFDBA) exerts its primary regenerative effect through:
Answer: Osteoinduction via exposed bone morphogenetic proteins
Demineralization exposes BMP-2 and other growth factors embedded in the bone matrix, allowing DFDBA to recruit and differentiate host mesenchymal stem cells osteoinductively.
In the one-stage implant protocol (tissue-level implant), the healing abutment emerges through the mucosa because:
Answer: No second surgery is required to expose the implant
Tissue-level implants with trans-mucosal collars avoid a second-stage uncovering surgery since the polished collar passes through soft tissue at initial placement.
Which factor most significantly affects the fatigue life of an implant-supported fixed prosthesis screw?
Answer: Magnitude of preload achieved during tightening
Adequate preload clamps the joint, minimizing micro-movement and cyclic stress on the screw; insufficient preload is the primary cause of screw loosening and fatigue fracture.
Reactive oxygen species (ROS) produced during implant osseointegration primarily serve to:
Answer: Signal macrophage polarization and modulate healing
Controlled ROS production signals macrophage phenotype switching from M1 (pro-inflammatory) to M2 (pro-healing), orchestrating the foreign body response toward successful osseointegration.
The 'critical contour' concept in implant emergence profile design refers to:
Answer: The prosthetic profile that compresses tissue to create a natural gingival architecture
The critical contour is the supragingival crown shape that provides gentle tissue support and creates a natural-appearing gingival emergence without impinging on the sulcus.