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operative > failure > Flashcards

failure Flashcards

1
Q

Surface Discoloration (c)

A
  1. Air voids during mixing (chemical cure)
  2. Surface contamination (blood – saliva)
  3. Improper matrix technique
  4. Improper polymerization
  5. Improper finishing
  6. Type of composite and surface abrasion
  7. Poor oral hygiene and smoking
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2
Q

Bulk Discoloration (c)

A
  1. Chemically cured type (tertiary amine)
  2. Expired composite material
  3. Air void inclusion (chemical cure)
  4. Contamination during mixing (unclean spatula, pad)
  5. Moisture contamination
  6. Water sorption
  7. Improper polymerization
  8. Improper shade selection
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3
Q

Marginal Discoloration (c)

A
  1. Non beveled cavity margin
  2. Undermined cavity margin
  3. Contaminated cavity wall
  4. Improper etching and bonding technique
  5. Impaired adaptation
  6. Inadequate incremental technique
  7. Polymerization shrinkage
  8. Coefficient of thermal expansion
  9. Yielding under stress
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4
Q

Loss of anatomic contour (c)

A
  1. Occlusal abnormalities
  2. Level of gingival margin
  3. Restoration size
  4. Composite resin type
  5. Insufficient polymerization
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5
Q

Recurrence of decay (C)

A
  1. Non beveled cavity margin
  2. Improper etching and bonding
  3. Inadequate adaptation
  4. Dimensional change
  5. Leaving decay
  6. Increased coefficient of thermal expansion
  7. Marginal deterioration
  8. Water sorption
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6
Q

Postoperative sensitivity (C)

A
  1. Traumatic cavity preparation (continuous cutting, no proper cooling system, dessication)
  2. Unlined deep cavity (GIC or calcium hydroxide and GIC if very deep)
  3. Bacteria contaminated floor → recurrence of decay
  4. Intensive dentin etching and desiccation (dehydration of the dentin from moisture)
  5. Leakage and cuspal flexure (proper condensation of cervical wall in class II)
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7
Q

Inadequate proximal contour (c)

A
  1. Improper matricing and wedging
  2. Inadequate separation
  3. Faulty incremental technique
  4. Improper finishing technique (vigorous use of finishing strip)
  5. Decrease dentist skill
  6. Decrease wear resistance
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8
Q

Fractured restoration (c)

A
  1. Increased occlusal stresses
  2. Shallow cavity depth
  3. Mis-selection of cases
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9
Q

Failure of retention (c)

A
  1. Insufficient remaining tooth structure
  2. Improper application of adhesive
  3. Unfavorable occlusal stresses
  4. Water contamination
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10
Q

Recurrent caries (a)

A

Improper cavity preparation

Gross leakage Bacterial plaque accumulation

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11
Q

Recurrent caries: Improper cavity preparation (a)

A
  1. Incomplete inclusion of pits and fissures.
  2. Improper removal of decay.
  3. Undermined enamel left to fracture
  4. Improper finishing of cavosurface angle 90 degree.
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12
Q

Recurrent caries: Gross leakage (a)

A
  1. Inadequate condensation (esp cervically)
  2. Contraction of amalgam (over trituration)
  3. Cavity varnish not applied
  4. Deformation of the cusps (with occlusal forces)
  5. Deformation of amalgam due to creep (flow and creep)
  6. Cavity contamination with saliva.
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13
Q

Recurrent caries:Bacterial plaque accumulation (a)

A
  1. Open inter proximal contact
  2. Marginal overhang
  3. Marginal ditching (v-shaped groove between amalgam and tooth structure at cavosurface angle)
  4. Improper finishing and polishing.
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14
Q

Gross microleakage causes (a)

A
  1. Loss of retention of RM
  2. Recurrent caries
  3. Sensitivity
  4. Irritation of pulp
  5. Staining of margin
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15
Q

Periodontal affection (a)

A
  1. Improper matrix & wedge application leading to trauma and overhangs.
  2. Expansion due to moisture contamination, excess Hg. Under trituration.
  3. Gingival trauma during cavity preparation improper rest & guard.
  4. Improper contour & contact.
  5. Marginal ridge incompatibility.
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16
Q

Pulpal affection (a)

A
  1. Premature contact (high point) → traumatic occlusion
  2. Traumatic cavity preparation
  3. Unlined cavity (deep)
  4. Pulp exposure
  5. Leakage
  6. Galvanic current
  7. Traumatic occlusion
  8. Cracked tooth syndrome
  9. Over expansion of amalgam (excess Hg)
  10. Fractured restoration
17
Q

Marginal ditching (a)

A

Inadequate bulk of amalgam

Lack of support Decreased amalgam strength

18
Q

Marginal ditching: Inadequate bulk of amalgam (a)

A
  1. Cavo surface angle bevelling
  2. Over carving
  3. Thin marginal flash existence
  4. Exaggerated reverse curve
19
Q

Marginal ditching: Lack of support (a)

A
  1. Undermined enamel
  2. Expansion of amalgam
  3. Creep
  4. Crevice corrosion
20
Q

Marginal ditching: Decreased amalgam strength (a)

A
  1. Improper alloy selection

2. Improper manipulation

21
Q

Isthmus fracture: (a)

A

Increased tensile & impact stresses Decreased amalgam strength

22
Q

. Isthmus fracture: Increased tensile & impact stresses (a)

A
  1. Incorrect cavity design (resistance & retention form)
  2. Premature occlusal stresses (plunger cusps)
  3. Deep carving (↑ slop ↑stresses → lateral forces, ↓ bulk)
  4. ↑ surface roughness of amalgam.
  5. Sharp angles in preparation
23
Q

. Isthmus fracture: Decreased amalgam strength (a)

A
  1. Excess mercury
  2. Moisture contamination
  3. Poor condensation
  4. Dry mix
  5. Under trituration
  6. Shallow cavity
24
Q

Displaced restoration (a)

A

Related to retention form:

  1. Inadequate retention & resistance form
  2. Cavity over extension
  3. Insufficient amount of tooth structure (amalgam retention is by mechanical retention to the undercuts)
  4. Lack of extra means of retention (pins, bonded amalgam restoration)
  5. Improper condensation
  6. Stress concentration
25
Q

Discoloration of amalgam & tooth (a)

A

Discoloration of amalgam.
(tarnish & corrosion) Discoloration of teeth
(amalgam blues)

26
Q

Discoloration of amalgam & tooth: Discoloration of amalgam.

tarnish & corrosion) (a

A
  1. Improper manipulation:
    a. Under trituration
    b. Excess Hg
    c. Improper finishing
    d. Contamination
  2. Improper condensation
  3. Bad oral hygiene
  4. Opposing different metallic restoration (cathode and anode and saliva acts as an electrolyte → galvanic current)
27
Q

Discoloration of amalgam & tooth: Discoloration of teeth

amalgam blues) (a

A
  1. Unsupported Enamel

2. Misuse of cavity varnish. (biproduct of corrosion will enter the dentinal tubules)

operative (4 decks)

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