Shining 3D currently offers two material choice for C&B application. TN11/ CB11 is a high toughness, high flexural strength material for restore natural tooth color and excellent texture. This material is recommended using small resin tank and small ceramic platform pack.
This application guide emonstrates each step from 3D scanning to 3D on AccuFab printers with normal resin tank (2 bottles C&B resin) or small resin tank (1 bottle C&B resin).
Scan
Dental design software requires a digital impression of the patient’s anatomy in order to design a C&B related applications, such as crown, arch, veneers, etc.
To acquire this data, scan a patient directly with Aoralscan intraoral scanners or a poured model with AutoScan desktop scanners.
Design
We recommend setting the gap width of cement design parameter between 0.03–0.05 mm. For excess cement, a slightly larger value may be acceptable, but should avoid causing horizontal rotation issues.
Fixture sets are unnecessary when working with 3D-printed materials, as the printing process does not involve multi-axis operations like milling machines.
The design surface should be smoothly graduated, minimal thickness with approximately 1 mm (labial side greater than 0.5 mm). Sharp edges should be avoided, as they can weaken the material and increase the risk of breakage.
You can choose to use the Shining3D CreTempAI Crown Design software by entering
specific parameters for one-click AI design. Alternatively, you can opt for the Shining3D
Design Service (https://design.shining3ddental.com/), where professional designers will
create your requested design. Additionally, professional design software is also available for use.
One-Click Printing
Crown and Bridge One-Click Printing can be used after importing the files, auto layout, support generation and slicing will be automatically performed with AI algorithm and can be sending to printer for printer.
You could check in support adding stage to make sure the models are well performed before slicing to save time.
Manually added support
You can adjust the model to an optimum position and choose the support type “C&B Support”. Place the model with occlusal side facing the platform and avoid fitting surface support added, otherwise this may cause unexpectable result when fitting.
Post-process
Model Removal
Manually Cut
We suggest you use Shining 3D FabWash for the post-cutting and post-washing. But if you don’t have FabWash, we suggest you could use scrappers to remove the model and then use ultrasonic machine or hand wash with suggested procedure below。
FabWash
If you are using the standard ceramic platform, select "Cut and Wash" from FabWash for a streamlined process. For the small ceramic platform, exercise caution when removing the model with scrapers. During the washing stage, choose "CB" to use the default setting time for optimal cleaning results.
Support Removal
After removing the model from the platform, remove the support structures required for
printing. For smaller crown and bridge areas, the supports can be removed manually. For
larger models, such as arches, use the electronic pliers to segment and cut the support
base. Be cautious to avoid breaking any weak areas of the tooth and ensure that the surface of the model is not damaged.
Washing
Ultrasonic Machine
Place the model in beaker with optimum amount IPA ≥75% covered. Use Ultrasonic machine (150-500W) around 2 min.Afterward, transfer the model to a clean beaker with uncontaminated IPA and wash it again. Avoid washing for too long, as it can affect the model's accuracy and strength.
*If you have a strong power ultrasonic machine, please consider to decrease the washing time.
Hand Wash
Manual cleaning can be performed by using a soft-bristle brush dipped in clean alcohol
(concentration ≥75%) to gently brush the surface of the model and repeatedly rinse it in
alcohol for 1 minute. Replace the container with clean alcohol, repeat the steps, and clean again. It is not recommended to use a hard brush, as it may damage the surface of the model, affecting the surface quality and performance of the model.
Drying
Use a compressed air gun to thoroughly dry the cleaned model, ensuring that the surface is completely dry and free of excess IPA and residue. If any residue is still visible (with obvious reflections), repeat the cleaning procedure. After the model is fully dried, allow it to sit for 5 minutes before proceeding with the next steps.
Support point removal
After finishing the polishing of the support points, check the seating of the model. Place the tooth arrangement, crown and bridge, or other models onto the prototype and the model,and check the marginal fit.
Use a coarse silicone grinding head (around 150μm grit, recommended speed: 15,000-30,000 rpm/min). With the help of articulation paper, further adjust the occlusion based on the proximal and occlusal contacts.
For larger areas thatneed adjustment, a tungsten carbide bur can be used to polish. Ensure that the crown, bridge, or veneer is accurately seated on the model and that a good occlusal relationship is achieved, so the articulation paper can be evenly and smoothly removed from both the proximal contact and occlusal surfaces.
Post-Curing
Cure with FabCure N2 with 10min at 50 degrees.
Polishing with FabCure N2
After grinding, clean the teeth surface with clean IPA and a soft brush to remove dust, then use a compressed air to dry the surface.
Apply a thin, even layer of ceramic pen to the rown and bridge model, ensuring that no excess resin drips on the margin from the model, as this could affect the fitting. Cure using the ‘Aesthetical Mode’ 30s nitrogen curing.
Place in the cleansing liquid (Alkaline ≤10%, temperature ≤ 40 degrees) with the use of ultrasonic machine and soft brush to clean the model surface.
Cleaning and Disinfection
Use an ultrasonic machine with IPA (≥75%) for less than 1 minute to clean the model
surface, then soak the model in IPA for 10-15 minutes. After soaking, rinse the model under clean water.
*All the above procedure meets the policy under biocompatibility