When should subgingival margins for Crown preparations be considered?

Subgingival margin placement is necessary for several reasons: to hide the margin on a discolored tooth, to hide the margin when a more opaque restoration is placed, to chase old restorations or decay, and sometimes to increase the amount of tooth structure for the restoration.

What’s the difference between subgingival and Supragingival?

Subgingival bacterial populations prefer a no oxygen (anaerobic) environment, whereas supragingival bacterial populations prefer a low oxygen environment, and are called facultative anaerobes.

What is proximal box elevation?

The recently introduced technique of proximal box elevation (PBE) offers the possibility of performing a stepwise elevation of deep proximal cavities to create more favorable preparation margins for direct or indirect restorations.

How do you do subgingival scaling?

For subgingival scaling with hand instruments, use a subgingival curette (e.g. Gracey curette SG 11/12 or 13/14). Place the blade at 45°-90° to the root surface and pull firmly against the tissue to remove as much debris and chronically inflamed tissue as possible.

What is subgingival margin?

Subgingival margins very often mean bleeding gums, isolation problems, and the absence of a margin in enamel. With direct restorations, when margins are subgingival, placement of a matrix band, achieving isolation, and removing any excess material all become considerably more complex.

What is the Colour of subgingival calculus?

Subgingival calculus is most often brown, black or green in color from its chronic exposure to gingival crevicular fluid, blood and blood breakdown products. It is frequently associated with the development of the pyogenic granuloma, an epulis-like lesion on the gingiva.

What is Axiopulpal line angle?

ax·i·o·pul·pal (ak’sē-ō-pŭl’păl), Referring to the line angle formed by the junction of an axial and pulpal wall of a tooth cavity.

What is root planing and subgingival curettage?

Root planing is the smoothing of the subgingival root surfaces with a curette. The objective of root planing is to remove deposits and cementum in an attempt to achieve gingival reattachment. 146. What is gingival curettage? Curettage is the removal of the gingival sulcular lining of the periodontal pocket.