Tooth Carbide
Tooth preparation
① cutting edge: cutting edge of preparing a 1.5 ~ 2.0mm gap, cutting edge preparation into the anterior teeth and tooth long axis was 45 ° oblique lingual small slope, under the anterior margin requirements above teeth, but oblique labial margin slope.
② lip surface: In addition to neck edge, the tooth surface from the uniform worn out 1.5mm of tooth structure, but the crown margin 1 / 4 to the tongue side of the tilt 10 ° ~ 15 °, to ensure uninterrupted jaw protrusion, and to ensure cutting edge of ceramic thickness and color.
③ adjacent surface: In addition to eliminating undercut adjacent surfaces, prepare a deposit of porcelain repair the gap in addition to neck Furcation and shoulder to ensure that preparation, we must also maintain the proper cutting surface adjacent to the degree of polymerization of 2 ° ~ 5 °.
④ tongue: lingual if not designed to cover the porcelain, the metal is only prepared to repair the gap and ensure that the neck shoulder shoulder-length or more without undercut.
⑤ edge and anterior cervical collar: tongue tooth neck diameter, near and far are not allowed in diameter, usually designed to only shallow concave edge of the metal neck. In addition to tooth grinding thickness 0.35 ~ 0.5mm.
(2) anterior teeth and the main points of the body preparation method
① anesthesia: as needed, preoperative vital teeth under local anesthesia.
② incisal preparation: high-speed Wheels columnar coarse diamond bur or bur in the tongue cutting edge up, first grind the 1.5 ~ 2.0mm deep trench 2 to 3, determine the appropriate amount of die-cut, then turn extended to the near and far, to complete the cutting edge of the cutting.
③ lip surface preparation: to a coarse-grained silicon carbide cylindrical bur first cut in the lip 1 / 2 grind of 1.0 ~ 1.5 mm deep longitudinal groove, and then gradually extended to the near and far. Lip and gum and then in 1 / 2 turn rubbed off the same depth, but the direction consistent with the teeth long way.
④ adjacent surface preparation: preparing the lip with a needle close to the crown surface of the vehicle axial angle cut to the ground surface adjacent the first edge to the cutting edge of the neck undercut part of the worn out, draw a line were ground shoulder 1.0mm proximal tooth structure, and control the axial plane tangential convergence 2 ° ~ 5 °.
⑤ tongue preparation: According to the design requirements, the tongue cut 2 / 3 fine pear-shaped diamond bur uniform worn out metal tongue panel (0.5 ~ 0.8mm) or deposit of the required thickness of the porcelain lingual (1.0 ~ 1.5mm).
⑥ neck sleeve preparation: To ensure the Dental Reviews retention of crowns and stability, crown 1 / 3 of the neck cuff preparation is particularly important. To an end with 135 ° taper of the shoulder by cone bur grinding on the tooth long axis direction of the gap in addition to the required repair after the formation of tangential to 2 ° ~ 5 ° of the cylindrical neck sleeves.
⑦ shoulder preparation: to a slow phone installed in coarse or fine-grained part of the tooth neck, shoulder bench drill, usually in the gingival margin of 0.5 ~ 0.8mm at a depth of preparation (shoulder width). Labial is 1.0 ~ 1.5mm, proximal, lingual to 0.8 ~ 1.2mm was 135 ° angle shoulder, and maintain uniform thickness, smooth and continuous.
⑧ refinement completed: less tooth preparation is completed, should be carefully examined in the middle of the upper and lower jaw teeth, jaw position on the edge, the cut side, tongue side of the repair space is adequate. Fact, tooth preparation should be three parts or three directions of cutting the amount of which is to ensure removal of undercuts; aside shoulder thickness; different enough to repair the jaw position under the gap, to ensure transparency in occlusion and the ceramic layer and a half. Finally, the coarse drill over the polished tooth surface modification of light, remove the cause of the rough diamond cutting surface.
About the Author
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