What is the process for measuring gingival recession?
Gingival recession is measured clinically as the distance from the cemento-enamel junction to the depth of the free gingival margin using the millimeter markings on the periodontal probe and reflects exposure of the root cementum [7, 8].
What is the ideal taper for crown prep?
The aim of the preparation, in addition to creating space to accommodate the intended crown, is to prepare a shape appropriate to retain and support the crown. The ideal taper should be 10–20°.
What is recession in periodontics?
Gingival recession is defined as the displacement of the gingival margin apical to the cemento-enamel junction (CEJ). It is characterized by the loss of the periodontal connective tissue fibres along the root cementum and by concomitant loss of alveolar bone.
What are the steps of PFM crown preparation?
Tooth preparation involves several distinct steps which include, creating the guiding grooves for incisal or occlusal reduction, reducing the labial or buccal surfaces and axial reduction of the lingual and proximal surfaces. After those chosen steps are complete, all prepared surfaces can be finished.
How many mm of gum recession is normal?
If the gap between your teeth and gums measures between 1 – 3 mm, it’s considered normal and healthy. Since a toothbrush can’t reach easily below 3 mm, a pocket depth of 4 mm may be cause for concern. In these cases, your dentist will assess the condition of your gums.
What is the minimum amount of taper that should be maintained for an ideal tooth preparation?
When prepping a tooth for a posterior Zirconia crown, you will need to ensure that there is sufficient room for the wall thickness to have a minimum of 0.5 mm and ideally between 1 mm and 1.5 mm or 1.5 to 2 mm occlusal reduction. The prep should be tapered between 4°and 8°.
What causes dental recession?
The most common cause for gum recession is a bacterial infection called periodontal (gum) disease that most often arises from plaque, a thin film of bacteria and food particles accumulating on teeth. Gum disease in turn weakens the gums causes them to recede.
What is PFM preparation?
PFM crown preparation requires deep facial reduction to give enough space for metal and porcelain, and thus avoiding over contouring and poor esthetic which would inevitably occur when no enough tooth structure is removed. The amount of labial reduction is 1.5-2 mm.