Porcelain Veneers
Veneers or porcelain veneers are restorations that cover the front tooth, usually employed in the above, the purpose is almost always aesthetic.
Originated in the twenties, for the aesthetic requirements of some movie stars, they wanted to show a smile with a perfect appearance. The fundamental problem was the inability to fix them permanently to the tooth, so that at first only wore while filming a scene.
The great development of the porcelain veneers are two important developments: the ability to record the inside of the veneer with an acid and the possibility of using resin cements adhere to the tooth through the enamel etching. With the combination of both factors suffer veneers that places great boost today as the treatment of choice in situations of compromised esthetics.
Advantage
They improve the aesthetic appearance of our patients significantly, as they are able to modify the shape, position and color of teeth even in difficult cases.
Porcelain Veneers
It is the most conservative (the least amount of tooth size) to modify the aesthetics of anterior teeth.
The resistance to abrasion, wear and the fracture is much higher than in composite restorations (white fillings).
They are resistant to attack by oral fluids and alcohol.
They are very biocompatible.
Maintain the color and brightness.
Excellent fit is obtained outside of the tooth.
Are homogeneous, which can hold no plaque or stain.
Their union is very strong enamel.
They have a highly polished surface that hinders the deposition of bacterial plaque which encourages periodontal health.
Disadvantages
Its cost is relatively high.
Cannot be repaired once cemented. It is also almost impossible to remove, usually must be destroyed with rotary instruments to loosen the tooth.
It can be used when we want to make major changes in the tooth.
Time-consuming preparation, laboratory, and placement.
Can be altered by fluoride gels have acid in it (APF and fluorine tin).
The choice of the color of porcelain for veneers is difficult and can only really appreciate the aesthetic results once they have been cemented, it is impossible to change as this operation has been performed.
They are extremely fragile before cementation, so its handling is difficult and should be very careful.
The preparation of the tooth requires a precise cut, appropriate to each particular case, to avoid completely remove the enamel and allows both to avoid overcontoured.
Directions
Discoloration of the anterior teeth: Tetracyclines (medicine), fluorosis (excess fluoride in the tooth), old restorations, caries, coffee, snuff, tea, white discolorations deficit calcification, and so on.
Alteration of the shape of the teeth:
Conoid teeth (teeth very small with tapering).
Central teeth (commonly called “blades”) too short.
Attrition (tooth wear from rubbing against another).
Abrasion (wear by something outside the mouth acting on physical mechanisms such as brushing, habits, etc..).
Alterations of the position of the teeth: rotations, tilted teeth toward the tongue, teeth take the place of others that is not theirs, and so on.
Edge of the tooth fractures.
Diastemas (gaps between teeth and tooth) mild or moderate.
Deviation from the midline of the teeth with respect to the midline of the face.
Agenesis (not formed, there are no mouth) upper lateral incisors, changing the morphology of the canines and transforming them into maxillary lateral incisor.
Combination of various pathologies.