Digital production---Zirconia blocks
Bogey: Without chamfer preparation and chamfer preparation with bevel, the abutment preparation principle of Cercon zirconia restorations is consistent with known all-ceramic restorations. Therefore, the zirconia restoration is not suitable for shoulder-free preparation or preparation with a beveled shoulder. Both methods will have too thin edges and there is a danger of fracture.
Appropriate: rounded beveled shoulders, or horizontal-angled shoulders with a rounded neck-angle. It should be prepared in the following form:
1. Obvious slope (90 degrees)
2. Prepare the shoulder with a round blunt shaft - neck angle The cylindrical Emery bur with rounded tip is suitable for preparing the bevel, while the tapered diamond bur with rounded edge is suitable for preparing the shoulder for round Blunt uranium - neckline angle.
Second, the front teeth restorations
1, basic essentials:
The preparation of anterior restorations is based primarily on the basic preparatory principles described above. The preparatory width of the periphery is 1.0mm, and the shaft wall must be rounded, just like the lip (minimum radius: 0.4mm)
2, the width of the cutting edge:
From an aesthetic point of view, the removal margin should be 2.0mm, and the minimum width of the vestibular-incisal margin should be 0.9mm to ensure that the cutting device can accurately replicate the medial tissue surface of the basal crown.
3, forming a temporal outline:
It is advisable to use the shank-shaped trimming bur as shown to form the lingual and cuspidal contours of the maxillary anterior teeth.
4, porcelain shoulder Taiwan:
Cercon zirconia restorations can also be used to make porcelain shoulders on the labial or occlusal surfaces and have a corresponding Cercon ceram kiss. The production of porcelain shoulders can also use Cercon ceramexpress. The next morphological copy can use the dyeing technique or "cutback" technique, using Cercon ceram kiss face porcelain to complete the dental posture and level. Free Dental Recruitment If the design requires the production of porcelain shoulders, the right shoulder shoulder preparation is better than the inclined shoulder shoulder preparation.
Third, the posterior dental restorations
1, bite the jaw surface to remove 1.5mm
For the trimmed caterpillar of the posterior region, a minimum thickness of 1.0 mm for the maxillofacial porcelain layer must be reserved for the decorative porcelain. The thickness of the basal crown is a minimum of 0.4 mm, so the jaw surface should be abraded by 1.5 mm. The relative axial polymerization angle should be 6-8°, and the junction between the shaft wall and the maxillofacial surface should be blunt.
2. Simplify the undulation of the maxillo-maxillofacial area
The undulation of the maxillofacial surface should be simplified. The 120-140° open angle of the maxillofacial surface can ensure accurate replication of the inner crown surface during the cutting process, resulting in a perfect seal. Using a rhomboid-shaped diamond bur to cut perpendicular to the long axis of the tooth is ideal for preparing a bite.
3, determine the direction of wear
When determining the direction of insertion, it is important that the abutment of all abutment teeth have a taper of at least 6°, especially for fixed bridges. During the scanning process, too steep slopes will be considered vertical and cannot be accurately displayed in the software.