Sensi-Class 4 restorations Flashcards
1
Q
Class 4 definition:
A
- incisal edge and interproximal surface of anterior teeth
2
Q
Indications for class 4 restorations:
A
- caries
- fracture
- nail biting
- trauma-horizontal
- wear
- attrition
- parafunction
- aging
- erosion(abrasion)
- mal-formation
- peg laterals
- defective restorations
3
Q
Class 4: Contraindications
A
- insufficient remaining tooth structure
- persistent fractures due to para-function
- inability to shade match or create correct tooth contours or surface characteristics
- when the tooth fragment is available and in good shape
4
Q
Shad matching: 3 color characteristics
A
- Hue
- Chroma
- Value
5
Q
Hue
A
- color
- A=brown
- B=yellow
- C=Gray
- D=Red
A&B=80% of patients
C=Gray
D=Red (trauma)
6
Q
Chroma
A
- intensity or saturation of the hue
- Low number=light color, unsaturated
- high number=dark color, saturated
7
Q
Value
A
- Brightness
- lightness or darkness
- User-defined
- higher=brighter
- to much dentin
- little enamel
- Low-darker/less bright
- little dentin
- to much enamel
- B1=brightest
8
Q
General Guidelines for shade selection:
A
- teeth clean and hydrated
- remove bright colors from field of view
- makeup
- clothes
- walls
- view patient at eye level
- light source is color corrected
- evaluate shade under multiple light sources
- do not stare
- squinting helps
- if eyes tire, gaze at soft blue/gray surface
9
Q
Clinical tips for shade selection
A
- dive tooth surface into 3 areas
- incisal 1/3
- translucency and opalescence effect
- middle 1/3
- interaction of the dentin and enamel
- Cervical 1/3
- shade of underlying dentin
- incisal 1/3
- always confirm match by placing composite on tooth, light cure and wet it
- mock-up recommended in challenging cases
10
Q
Composite Layering
A
- use specific shades for enamel and dentin based on the optical characteristics observed on natural adjacent teeth
- allows optimal light transmission
- provides more realistic depth of color and surface characteristics
11
Q
Understanding appearance of natural teeth: factors
A
- opacity and translucency
- optical effects
- special characterizations
- surface texture & luster
12
Q
opacity and translucency
A
ability to transmit light
- opacity-material blocks passage of light through the material
- translucency-allow light to pass through
13
Q
opacity and translucency: Enamel vs dentin
A
- Enamel:
- high translucency
- transmits the dentin shade depending on thickness
- varies in thickness
- changes with age
- young enamel
- white
- thicker
- less translucent
- adult:
- neutral
- less thickness
- medium translucency
- Old enamel:
- yellow-grayish
- thinner
- high translucency
- young enamel
- regulates brightness
- Dentin:
- more saturated
- imparts tooth color
- defines the color
14
Q
Composite resins for:
enamel reproduction
translucent enamel layers
dentin reproduction
A
- Enamel reproduction:
- more white/translucent
- less saturation
- Translucent enamel layers
- highly translucent
- special effects (white, blue, ambar, gray)
- Dentin reproduction:
- less translucent
- highly saturated
15
Q
Opalescence
A
- reflected light=gives material bluish appearance
- Transmitted light=orange/brown appearance
- Enamel:
- blue on incisal third
- can have a opaque halo due to light emission and reflection angles equal due to lingual surface incline
