abutment and finish lines
In dentistry, a finish line refers to the termination point of a prepared tooth surface where the restoration (e.g., crown or bridge) will meet the tooth structure. The design and placement of finish lines play a crucial role in the success and longevity of the dental restoration. A well-prepared finish line ensures optimal fit, retention, and esthetics of the final restoration. There are different types of finish lines used in various situations: 1. Chamfer Finish Line: - A chamfer finish line is a continuous, beveled edge that runs circumferentially around the tooth preparation. - It provides a smooth, angled termination of the tooth structure, making it easier to seat the restoration accurately. - Chamfer finish lines are commonly used for metal-ceramic crowns. 2. Shoulder Finish Line: - A shoulder finish line is a distinct, defined ledge that is perpendicular to the axial wall of the tooth preparation. - It offers a well-defined margin for precise seati