s10-postinsertion failure Flashcards
What is a “non-specific complaint” post-insertion?
Patient is aware of the prosthesis due to artificial tooth placement, forces on abutments, or slight occlusal discrepancy. Resolves in 2-7 days.
Why might discomfort occur during function after prosthesis placement?
Tooth re-enters occlusal function after inactivity. Adjusts in 1-2 weeks.
What causes thermal sensitivity post-insertion?
Loss of enamel during prep, replaced with metal/ceramic. Resolves in 1-2 weeks.
Why does trauma to the cheek/tongue happen initially?
Temporary adaptation issue. Diminishes within 7 days.
List 3 causes of persistent discomfort/pain in fixed prostheses.
Oversized occlusal table, occlusal interference, excess soft tissue pressure.
How does an exposed cervical area cause pain?
Dentin sensitivity due to poor marginal fit or over-contouring.
What causes severe spontaneous pain under a prosthesis?
Undetected caries, excessive tooth reduction, no coolant/temporization, zinc phosphate cement.
How is severe spontaneous pain from pulp exposure treated?
Root canal treatment.
Name 3 causes of prosthesis looseness related to retention.
Short/over-tapered prep, improper cementation, solubility of cement.
How does abutment mobility contribute to looseness?
If one abutment is loose, cement breaks due to uneven forces.
Why does expired cement lead to looseness?
Loss of bonding properties over time.
What prosthetic flaws lead to recurrent caries?
Open/short/long margins, occlusal perforation, looseness.
How does an open margin promote caries?
Allows bacterial microleakage.
What causes a periapical abscess under a prosthesis?
Incorrect RCT. Treatment: Re-RCT.
How does a “positive pontic” cause gingival recession?
Excessive pressure on gingiva/bone.
What occlusal factors contribute to bone overload?
Occlusal interference, long span with few abutments, poor crown:root ratio.
Why does violating biological width cause recession?
Chronic inflammation from encroachment on connective tissue.
What metal substructure flaws cause ceramic fracture?
Sharp angles, incorrect metal thickness, perforations.
Why does porcelain fracture at the metal-ceramic junction?
Centric contact on junction or angle <90°.
How does rapid cooling affect porcelain?
Creates internal stresses leading to cracks.
List 3 causes of all-ceramic fracture.
Sharp prep edges, shallow reduction, bruxism.
Why is insufficient tooth reduction risky for all-ceramic crowns?
Thin porcelain is prone to fracture under load.
What design errors cause loss of function in a prosthesis?
Flat occlusal surface, no opposing tooth, out-of-occlusion design.
How does a wide occlusal table cause soft tissue trauma?
Increases contact with cheek/tongue.
Why might sharp prosthesis edges traumatize tissues?
Poor polishing after occlusal adjustment.
What prosthetic errors lead to food retention?
Minus proximal contact, minus pontic, out-of-occlusion design.
Why might an all-ceramic crown’s shade mismatch over time?
Natural teeth discolor; porcelain does not.
How does insufficient labial reduction affect shade?
Underlying tooth structure shows through.
What cement choice impacts all-ceramic crown shade?
Opaque cement can mask discoloration; translucent cement may not.
Why might porcelain firing errors cause shade mismatch?
Over/under-firing alters translucency/color.
