Post retention depends on:
a- Post length.
b- Post diameter.
c- Post texture.
d- Core shape.
e- Design of the preparation.
f- A and b
g- A, b and c.***
h- All of the above.
i- A.
This guideline normally places the post approximately two-thirds into the root length.
Improper length allows a potential for root fracture.
It is not necessary to construct a post for each canal in a multi rooted tooth, provided that the dominant root (i.e., palatal root of maxillary molar) is used and proper length has been established.
Parts of the tooth:
The age consists of a number of classes:
- Enamel:
the white outer layer of the tooth, is the most hardy of the dental strata, and is mostly composed of calcium phosphate.
This layer covers the outer surface of the crown of the tooth. [3]
- Dentin:
The layer that follows the enamel layer, located below, a solid layer made up of fine tubes, This layer is harder than the bone, In the case of the layer of enamel to destroy, the heat and cold transmitted Through these tubes causing the person's sensitivity and pain.
- Dental Pulp:
The pulp of the teeth consists of the soft tissues in which the blood vessels and nerve branches reach the teeth, which transport the blood and the sensation to the teeth.
- Cementum:
The mortar is a thin layer that covers the ivory at the root of the tooth and is part of the tissue group that stabilizes the tooth in the jawbone.
- Periodontal ligament:
The tissues that fix the tooth in the jaw bone.
Number of dental roots:
The number of root teeth and the number of root canals in each of them:
- All upper front teeth (cutouts and teeth) each tooth consists of one root and one root canal.
- All lower front teeth (cutouts and fangs) each tooth consists of one root and one root canal.
- The upper Alawajat initial consists of root and two radial channels.
- Upper secondary nuclei consist of one root and two radial channels.
- Primary inferior nuclei consist of one root and one root canal.
Secondary inferior nuclei consist of one root and one root canal.
- Primary and secondary primary molars consist of three roots and four channels of root.
- Primary and secondary lower molars consist of roots and three radical channels.
The roots of the teeth are identical to the permanent teeth and are smaller. The position of the roots of the teeth varies according to the number of roots. For example, in the primary ulema, which consists of roots, one of the roots is towards the cheek and the other towards the roof of the throat. The upper molars, Two towards the cheek and the other towards the tongue, and the lower basins consisting of two roots, one is closer to the midline and the other is in the farthest direction.
i- A.
This guideline normally places the post approximately two-thirds into the root length.
Improper length allows a potential for root fracture.
It is not necessary to construct a post for each canal in a multi rooted tooth, provided that the dominant root (i.e., palatal root of maxillary molar) is used and proper length has been established.
Parts of the tooth:
The age consists of a number of classes:
- Enamel:
the white outer layer of the tooth, is the most hardy of the dental strata, and is mostly composed of calcium phosphate.
This layer covers the outer surface of the crown of the tooth. [3]
- Dentin:
The layer that follows the enamel layer, located below, a solid layer made up of fine tubes, This layer is harder than the bone, In the case of the layer of enamel to destroy, the heat and cold transmitted Through these tubes causing the person's sensitivity and pain.
- Dental Pulp:
The pulp of the teeth consists of the soft tissues in which the blood vessels and nerve branches reach the teeth, which transport the blood and the sensation to the teeth.
- Cementum:
The mortar is a thin layer that covers the ivory at the root of the tooth and is part of the tissue group that stabilizes the tooth in the jawbone.
- Periodontal ligament:
The tissues that fix the tooth in the jaw bone.
Number of dental roots:
The number of root teeth and the number of root canals in each of them:
- All upper front teeth (cutouts and teeth) each tooth consists of one root and one root canal.
- All lower front teeth (cutouts and fangs) each tooth consists of one root and one root canal.
- The upper Alawajat initial consists of root and two radial channels.
- Upper secondary nuclei consist of one root and two radial channels.
- Primary inferior nuclei consist of one root and one root canal.
Secondary inferior nuclei consist of one root and one root canal.
- Primary and secondary primary molars consist of three roots and four channels of root.
- Primary and secondary lower molars consist of roots and three radical channels.
The roots of the teeth are identical to the permanent teeth and are smaller. The position of the roots of the teeth varies according to the number of roots. For example, in the primary ulema, which consists of roots, one of the roots is towards the cheek and the other towards the roof of the throat. The upper molars, Two towards the cheek and the other towards the tongue, and the lower basins consisting of two roots, one is closer to the midline and the other is in the farthest direction.
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Endodontics