Sixth 3 Flashcards
(32 cards)
Does Violating conformity of surface texture (characteristics of natural teeth ) cause unwanted prominence of your restoration ?
Yes , it determine how light reflected , transmitted , scattered and thus effect hue , chroma , value , translucency
How does appearance of tooth determined ?
By how light interacts with the curved and varied surfaces
Heavy texture = more directions of reflection = less value
Which surface of tooth is the most important for aesthetic restoration and why ?
Buccal surface and it must be matched cause it determine how light interacts with the curved and varied surfaces
Attractive prosthodontic replacement starts with a consistent silhouette and shape of the buccal surface
Which surface of tooth is the most important for aesthetic restoration and why ?
Buccal surface it’s the must important and must be matched cause they determine how does majority of light will be reflected
Attractive prosthodontic replacement starts with a consistent silhouette and shape of the buccal surface
Which tooth or restoration characteristic we see them from 5-6 fits away and which we must be close enough ?
Hue , chroma fairly enough close
Value , surface texture , opacity , disparities 5-6 fits away
Which tooth or restoration characteristic we see them from 5-6 fits away and which we must be close enough ?
Hue , chroma fairly enough close
Value , surface texture , opacity , disparities 5-6 fits away
Because we mainly see the surfaces of a tooth that are perpendicular to us, WHAT we can manipulate and how it affect the surface width and length of the restoration?
Cause we see only the perpendicular surface we can manipulate the perceived width and length by bending or flattening the surface , you can make the tooth look narrow or shorter by decreasing the width or length of the direct buccal reflective surface .
Because we mainly see the surfaces of a tooth that are perpendicular to us, WHAT we can manipulate and how it affect the surface width and length of the restoration?
Cause we see only the perpendicular surface we can manipulate the perceived width and length by bending or flattening the surface , you can make the tooth look narrow or shorter by decreasing the width or length of the direct buccal reflective surface .
How does maxillary incisors that are tipped lingually appear ?
They don’t reflect light , appear dark
How can we made the smile uniform without re-slinging the teeth ?
Bright it up
What’s specular reflection ? give an example ?
returns a high percentage of direct non-diffused ( straight , more directional )light, and if strongly illuminated, will be brighter and stand out .
Reflection from a smooth, mirror-like surface results in the production of a clear well defined image.
How does smoothing the texture of buccal surface will make teeth appear ?
Smoothing the texture of the buccal surface will make teeth appear lighter and brighter and therefore a primary determinate of value.
Cause light it doesn’t reflect in many directions
How does smoothing the texture of buccal surface will make teeth appear ?
Smoothing the texture of the buccal surface will make teeth appear lighter and brighter and therefore a primary determinate of value.
Which with time become smooth with specular reflective characteristics convexities or concavities ?
Most teeth have irregular surfaces with convexities and concavities. The convexities tend to wear and become smooth with specular reflective characteristics
What’s The visual impact of a tooth comes from these specular highlights of convecities wear
give the tooth its visual shape.
What’s The visual impact of a tooth comes from these specular highlights of convecities wear
give the tooth its visual shape.
How teeth concavities deal with light and what’s the reason behind ?
Concavities tend to collect light by reflecting inwards and tend to be unpolished, thus diffusing the light and less re- turns to the viewers eye = low value
Which restoration colours appear more close to you and which far ?
Bright objects , appear close to the viewer and it’s why light restorations appear to jump out to you
Lowering value ( brightness ) make the object far away
After shaping and contouring what’s the most next improtant factors affecting how light interplays with tooth surface ?
Surface texture , luster
How A roughened surface texture affect light ?
will not yield as well defined an image and will scatter the light and the individual wavelengths will all bend differently yielding a substantially different spectrum returning to the eyes
What’s parekymata?
Transverse , wavelike grooves , external manifestations of striae of retzius
What’s happen to parekymate by aging ?
Tend to wear ( abrade ) by age resulting in horizontal grooves transverse the tooth , separated by distance much greater the original one .
What’s happen to parekymate by aging ?
Tend to wear ( abrade ) by age resulting in horizontal grooves transverse the tooth , separated by distance much greater the original one .
Explain the shape and direction of parekymata
These horizontal grooves can be convexities and/or concavities and they stretch in a flat to U shape (bottom of U towards gingival) across the buccal surfaces of the maxillary incisors (Figure 16).
These horizontal undulations get flatter and closer together going gingivally.
They never cross each otherand they go circumferentially.
