Posted 1418 days ago
Sponsored by Kuraray
Patient presentation
An 80 -year -old presented what they considered that they were unattractive teeth due to compound links that went out over time, creating antistnetic patches (Figure 1). Specifically, the patient declared that he wanted younger appearance and was tired of replacing the compounds every few years and, therefore, wanted an aesthetic and lasting solution. In addition, after the clinical examination and radiograph evaluation, a diagnosis of recurring disintegration was established in #S 6 to 11 teeth.
Figure 1: Preoperative photo of the teeth #s 6-11.
Material
A several -layer translucent material, Katana ™ Zirconia STML (Kuraray Noritake), to restore the patient’s teeth, as it provides optimal resistance and aesthetic without the need for external spots is chosen. The multi -layer block consists of four layers of zirchon in graduated tones, including a layer of enamel, two layers of transition and a body layer (dentin). This material requires approximately 8 to 10 minutes of milling time (dry milling) per unit in the Cerec® MC XL milling chamber, and 30 minutes sintering at CEREC Speedfire.
Treatment and technique steps
Step 1: Preparation
The 6 to 11 teeth were prepared as much as possible to accept STML crowns of Circonio Katana ™ (Figure 2). The Cerec Biojaw function, together with the tools of biocopy, morphology and positioning of CEREC, were used to design restorations in an effort to maintain the size of the teeth similar to the patient’s existing teeth, but with a better morphology. In addition, it was decided to add more incised, since the patient was not happy with the flat and worn appearance of his natural teeth.
Figure 2: Preparations ready for digital scans.
Step 2: Scan
The following scans were captured: upper biocopy, lower jaw and oral bite. A preparation scan was also tasks in the upper jaw after teeth preparation with crown preparations (Figures 3 and 4).
Figure 3: Crown preparations scan with gingival margins Delineate.
Figure 4: Oral preparation scan.
Step 3: Design
After an initial proposal was received with the biogenenical individual method, the Biojaw method was used to generate a design that was identical to biocopy in terms of length and width, but also satisfied the lack of the lack of patient’s shape. A way to provide incisal switches to avoid the flat and worn appearance of the incisal edges (Figure 5) was chosen (Figure 5).
Figure 5: Proposals of the Biogheric crown.
Step 4: Milling
Each unit was milling at the MC XL, which was used for its ability to dry the mill zone. The “fine” milling parameter was chosen since this case was not “seat the same day”, so time was not a problem. That said, each of the six restorations required approximately 8 to 10 minutes total milling time.
Step 5: Shoot
The restorations were triggered in the Cerec Speedfire for approximately 30 minutes.
Step 6: Glazing
The inherent multilayer shadow of the Katana ™ material produces a natural shadow gradient, which has no need for additional spots. A light coating of intenco spray glaze was applied to each restoration to impart a natural glow.
Step 7: Cementation
The INTAGLY of each restoration was gone up with alumina dust as mechanical engraving, and then rinsed and dried up in preparation for cementation. Next, following the manufacturer’s instructions for use, Clearfil ™ Ceramic Primera Plus (Kuraray Noritake) was applied to the INTAGLY of each restoration, followed by the primer of the Panavia ™ V5 tooth ™ V5 to each V5 cement INTAGLA settlement.
Conclusion
The patient was extremely happy with the final results, since with all his desires of uniform tooth of young appearance without mosaic (Figure 6). From the point of view of a clinician, I enjoyed working with a material that was easy to mold, along with high strength and excellent aesthetics directly from the milling chamber.
Figure 6: Katana ™ Stml Katana ™ crowns.