Color Of Newly Erupted Teeth Flashcards
Why does In a newly erupted tooth, the superficial layers ofenamel are the most opaque and appear as though they have a white frost ?
This superficial frosted enamel may have a higher organic component
is less mineralized, and has more empty space between the enamel crystals all of which causes the increased opacity.
Why does In a newly erupted tooth, the superficial layers ofenamel are the most opaque and appear as though they have a white frost and low luster ? When it become less opaque ?
This superficial frosted enamel may have a higher organic component
is less mineralized, and has more empty space between the enamel crystals all of which causes the increased opacity.
has a very low luster caused by the pronounced rod endings from enamel deposition.
As these top layers wear off, the underlying enamel is less opaque.
How the enamel of newly erupted effect light interaction and chroma ? When tooth become more obvious ?
Due to high opacity, the superficial enamel of the young tooth is very reflective.
The chroma of a tooth, which primarily comes from dentin, will be lower due to the masking effect of the young enamel.
As the enamel gets thinner, the dentin becomes more obvious.
Why does Young teeth dehydrate quickly and older teeth not to dehydrate as much ?
Young enamel is more permeable.
older teeth with enamel worn thin will not dehydrate much.
So maybe only superficial layers of enamel is permeable
What’s enamel thickness and chroma throughout the tooth ?
The natural thickness of enamel is greatest at the incisal and least at the cervical.
Chroma is greatest at the cervical and decreases toward the incisal.
Which part of enamel remain by the age of?
With age, only the deeper more translucent enamel remains
When light enters a tooth, it may reflect off many sur- faces within the tooth before it exits substantially chang- ing its character. The more scattering that takes place in the enamel ?
the higher the value.
More translucent = no scattering = less value
Less translucent = scattering = more value
How does enamel rods direction and crystalline structure affect teeth color and show up dentin color ?
Enamel rods and the surrounding interprismatic sub- stances are positioned perpendicularly to the dentin layer.
This crystalline structure permits light to pass through, which then reflects the underlying color of the dentin.
How does enamel prisms structure influence enamel light transmitted and what’s phenomenon called
The prism structure of enamel influences light transmission resulting in anisotrophy, directionally dependent light propagation .
We sometimes see highly pigmented area from one angle but not from other one
Enamel translucency varies with the angle of incidence, wavelength, dehydration
If we were to place the rainbow on a line, then the A and B shades in which range ?
A shade is more towards the red end of the yellow spectrum
B shade is more to the green end of the yellow spectrum
Most teeth are closer to A onthe Vita shade guide but there is a much wider spectrum of natural hues than most shade guides provide.
How does pulp chamber affect tooth color ?
The thickness of dentin, the size of the pulp chamber, and the vitality of the pulp tissue are different during different stages of tooth development.
Teenagers generally have a larger pulp chamber that adds red.
With secondary dentin formation, the pulp chamber decreases in size and the teeth become less red with age.
How does pulp chamber affect tooth color ?
The thickness of dentin, the size of the pulp chamber, and the vitality of the pulp tissue are different during different stages of tooth development.
Teenagers generally have a larger pulp chamber that adds red.
With secondary dentin formation, the pulp chamber decreases in size and the teeth become less red with age.
What’s the color of old / sclerotic dentin ?
Young dentin color ?
Darker more green blue
High chroma, low value
Young red yellow
Though the dentin undergoes a color shift from red yellow towards yellow, the overall color of older teeth is redder than in youth because there is less bright enamel covering the red dentin due to wear.
What’s determine value ?
Value is mainly determined by qualities of the enamel layer in the form of reflectivity and opacity.
As the su- perficial layers of the enamel surface are worn, the translucency goes up and the dentin becomes more visible how this effect chroma and value ?
dentinal chroma begins to influence value more, value become less
