Operative OSCE
Classes of restorations
1.pits and fissures of anterior and posterior teeth
2. Inter proximal of posterior teeth (smooth surface caries)
3. anterior: inter proximal surfaces (smooth surface caries)
4. anterior: interpret but including the incised edge
5. Cervical region on anterior and posterior
6. Cusps of posterior and incised edge of anterior
Name the internal/external walls on the preparations
1. distal wall
2. plural wall
3. Axial wall
4. Gingival wall
5. Buccal wall
6. Lingual wall
2 +3 = internal walls
what factors affect your tooth preparation for any resto
1. Diagnosis
2. Dental anatomy
3. Patient factors
4. Preservation of tooth structure
5. Restorative materials used
What is retention form
Retention form: form that best permits restoration to resist displacement through tipping or
lifting forces as well as masticatory forces
o Amalgam: macromechanical retention
o Composite: micromechanical retention
what is resistance form
• Resistance form: Shape and placement of preparation walls that best enables
both tooth and restoration to withstand forces, particularly the masticatory forces along the
long axis of the tooth
o Unsupported enamel
o Undermined cusps
o Sufficient material thickness (min 2mm for amalgam, no minimal limit
, for composite except in areas of occlusal force where min is 1.5mm)
what is convenience form
• Convenience form: form of cavity preparation that best allows adequate
observation, accessibility and ease of operation in preparing and restoring the cavity
o Accessing to interproximal caries through the marginal ridge
o Beveling- for aesthetics (upper anteriors or whenever aesthetics is a
concern)
What is the difference between finishing and polishing in composite
Finishing:
removing marginal irregularities
define anatomical contour
smoothing surface roughness
Polishing
removing minute scratches
obtain a smooth light reflective Lustor
instruments for finishing
abrasive discs (graded)
smooth diamond burs (football, flame point and tapered)
instruments for polishing
finer polishing discs (yellow)
polishing cups and pointed cone
what are the most reasons for marginal leakage
bond strength decrease with time
what are the side effects of marginal leakage
secondary decay
pain
sensitivity
resto fracture: affect the strength of the composite
How would you protect the pulp when using amalgam or composite
CH: hard set calcium hydroxide: calcimol
RMGIC: Vitrabond Fuji LC
GIC: Fuji 9 -----> THIS IS BASE
DA: dental adhesive: unfilled resin
Classes of restorations
1.pits and fissures of anterior and posterior teeth
2. Inter proximal of posterior teeth (smooth surface caries)
3. anterior: inter proximal surfaces (smooth surface caries)
4. anterior: interpret but including the incised edge
5. Cervical region on anterior and posterior
6. Cusps of posterior and incised edge of anterior
Name the internal/external walls on the preparations
1. distal wall
2. plural wall
3. Axial wall
4. Gingival wall
5. Buccal wall
6. Lingual wall
2 +3 = internal walls
what factors affect your tooth preparation for any resto
1. Diagnosis
2. Dental anatomy
3. Patient factors
4. Preservation of tooth structure
5. Restorative materials used
What is retention form
Retention form: form that best permits restoration to resist displacement through tipping or
lifting forces as well as masticatory forces
o Amalgam: macromechanical retention
o Composite: micromechanical retention
what is resistance form
• Resistance form: Shape and placement of preparation walls that best enables
both tooth and restoration to withstand forces, particularly the masticatory forces along the
long axis of the tooth
o Unsupported enamel
o Undermined cusps
o Sufficient material thickness (min 2mm for amalgam, no minimal limit
, for composite except in areas of occlusal force where min is 1.5mm)
what is convenience form
• Convenience form: form of cavity preparation that best allows adequate
observation, accessibility and ease of operation in preparing and restoring the cavity
o Accessing to interproximal caries through the marginal ridge
o Beveling- for aesthetics (upper anteriors or whenever aesthetics is a
concern)
What is the difference between finishing and polishing in composite
Finishing:
removing marginal irregularities
define anatomical contour
smoothing surface roughness
Polishing
removing minute scratches
obtain a smooth light reflective Lustor
instruments for finishing
abrasive discs (graded)
smooth diamond burs (football, flame point and tapered)
instruments for polishing
finer polishing discs (yellow)
polishing cups and pointed cone
what are the most reasons for marginal leakage
bond strength decrease with time
what are the side effects of marginal leakage
secondary decay
pain
sensitivity
resto fracture: affect the strength of the composite
How would you protect the pulp when using amalgam or composite
CH: hard set calcium hydroxide: calcimol
RMGIC: Vitrabond Fuji LC
GIC: Fuji 9 -----> THIS IS BASE
DA: dental adhesive: unfilled resin
