خدمة تلخيص النصوص العربية أونلاين،قم بتلخيص نصوصك بضغطة واحدة من خلال هذه الخدمة
According to Moncada, Aranguiz and Urzua, extrinsic pigmentations are usually produced on the surface of the tooth.N3: type of indirect dental stain with colorless materials or pre-chromogens that bind to teeth, carrying a chemical reaction that causes the dye to convert to chromogens and pre- chromogens, such as fluoride or chlorhexidine [9].This is the case of pigmentation by tetracycline, different degrees of "enamel hypoplasia", "fluorosis", "dentinogenesis imperfecta", among others [12]. Santana describes the presence of a natural tooth color space, named as a "sub-shaped banana", this space is located between the light red and light yellow, elongated and extended parallel to the axis of light; the extreme values (the lighter and the darker tooth) corresponding to the value of dental color, which is measured in different systems, manual or digital [13].Most of the extrinsic pigmentations can be treated with mechanical or chemical coloring renewal techniques, and advising the patients about their habits and prevention mechanisms to avoid surface stains [9].Such pigmentations can be classified into the following:
N1: type of direct dental stain with chromogenic bind to the tooth surface.
According to Moncada, Arangüiz and Urzúa, extrinsic pigmentations are usually produced on the surface of the tooth. The attraction of different materials to the tooth surface plays a critical role in the deposition of extrinsic pigmentations. There is involvement of electrostatic and Van Der Waalas forces, acting for long periods of time, as well as hydrophobic effects, dipole forces and hydrogen bonds acting for short periods of time. These interactions allow the chromogenic agent to pre-reach the surface of the tooth determining the occurrence of the pigmentations [12].
Such pigmentations can be classified into the following:
N1: type of direct dental stain with chromogenic bind to the tooth surface. The color of the chromogen is similar to that of the dental stains; such as stains by tea, coffee, wine, metals and bacterial products [9].
N2: type of direct dental stain with colored materials that change tooth color after joining the surface. Pigmented materials are initially bonded to the surface of the tooth and then change the color. Typical example is yellow-pigmented plaque or coffee on inter-proximal or cervical areas [9].
N3: type of indirect dental stain with colorless materials or pre-chromogens that bind to teeth, carrying a chemical reaction that causes the dye to convert to chromogens and pre- chromogens, such as fluoride or chlorhexidine [9].
Most of the extrinsic pigmentations can be treated with mechanical or chemical coloring renewal techniques, and advising the patients about their habits and prevention mechanisms to avoid surface stains [9].
The intrinsic pigmentations are those that involve the thickness of the tooth, located in the enamel or dentin. They consist of deep pigmentation, and are difficult for therapeutic options or therefore constituting a clinical challenge to find a solution. This is the case of pigmentation by tetracycline, different degrees of “enamel hypoplasia”, “fluorosis”, “dentinogenesis imperfecta”, among others [12].
Santana describes the presence of a natural tooth color space, named as a “sub-shaped banana”, this space is located between the light red and light yellow, elongated and extended parallel to the axis of light; the extreme values (the lighter and the darker tooth) corresponding to the value of dental color, which is measured in different systems, manual or digital [13].
تلخيص النصوص العربية والإنجليزية اليا باستخدام الخوارزميات الإحصائية وترتيب وأهمية الجمل في النص
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