Hints And Tips For A Successful Post Preparation
Crown / Root / Post Proportions
1. Selected Post diameter shall not be larger than 1/3 of root diameter 2. Post length in the root should be as long as the height of the crown 3. Post length should be at least ½ of root length 4. 1/3 of post length should be located in the coronal area and 2/3 in the root 5. Apical stop shall be at a least 4 mm
Ferrule Effect
Preserving sound coronal and radicular tooth structure to create a ferrule effect is crucial for the optimal biomechanical behavior of restored teeth. 1.5- to 2 mm of ferrule has a positive effect on fracture resistance.
Residual dentinal walls are expected to be at least 1 mm thick. An incomplete ferrule is considered to be a better option than a complete lack of ferrule. In teeth with no coronal structure orthodontic extrusion should be considered rather than surgical crown lengthening.
Biologic Width
The biologic width is the distance from the depth of the gingival sulcus to the crest of the bone (average 2.04 mm*). Biologic width is inviolable to protect
periodontal health, which is one of the keys for tooth and dental restoration longevity. This distance can be corrected with crown lengthening: surgical osteotomy, gingivectomy or orthodontic extrusion. * Schmidt JC, Sahrmann P, Weiger R, Schmidlin PR, Walter C. Biologic width dimensions – a systematic review. J Clin Periodontol 2013; doi: 10.1111/jcpe.12078.
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