Finish Line Pdf For Free

It is the final margin that separates between the prepared axial tooth surface and the remaining unprepared tooth surface.

Finish line type: shoulder (0.5 mm), feather-edged, chamfer (0.6 mm), and mini chamfer (0.4 mm).

'A finish line design for tooth preparation in which the gingival aspect meets the external axial surface at an obtuse angle'. A shoulder with a bevel on the external edge Reduces marginal discrepancy of the restoration as it can be burnished.

Chamfer margins are indicated for the preparation of full gold crowns and the lingual portion of a metal-ceramic crown. A chamfer margin should be smooth and distinct and allow for 0.5mm thickness of the material. This conserves tooth structure but still creates space for adequate bulk of the material.

It is recommended that chamfer finish lines for all metal crowns possess a minimum depth of approximately 0.3mm (Goodacre, 2004). The following types of finish line have historically been used with metal ceramic crowns: chamfer, bevelled chamfer, shoulder and bevelled shoulder.

The shoulder finish line which is used in all ceramics with 130 degrees has the advantage of beveling and having adequate preparation. Heavy chamfer finish line with more than 90 degrees cavo-surface line angle is used as it gives perfect marginal fit.

Knife edge or feather end finishing line It is the most conservative type of finishing line since the least amount of tooth structure is removed, but the margin is weak since this margin design does not provide enough bulk or thickness for the material. It forms >135° cavo-surface line angle.

Finish Line: It is the peripheral extension of tooth preparation or It is the terminal portion of a prepared tooth. Definition by Schwartz: Refers to the border of preparation where the prepared tooth structure meets the unprepared surface of the tooth.

Knife edge or feather end finishing line It is the most conservative type of finishing line since the least amount of tooth structure is removed, but the margin is weak since this margin design does not provide enough bulk or thickness for the material. It forms >135° cavo-surface line angle.

Chamfer ? GPT- A Finish line design for tooth preparation in which the gingival aspect meets the external axial surface at an obtuse angle.