Dental CAD/CAM FAQ | Common Troubleshooting and Technical Questions

Q1: Can the YRC-5X Milling Machine Be Used to Trim Finished Clear Aligners? (Are There Any Case Images?)

Answer: No, the YRC-5X dental milling machine is not designed for trimming finished clear aligners. The YRC-5X is specifically developed for processing Ø98 mm standard dental disc materials, including zirconia, PMMA, wax, composite resin, and other compatible CAD/CAM disc-based materials. Since finished clear aligners are non-disc materials and already completed appliances, they are outside the supported machining range of the system. Therefore, the YRC-5X cannot process non-98 mm disc materials or finished orthodontic cases.

Q2: What Causes the Milling Machine Alarm to Be Triggered?

Answer: In many cases, the alarm may be caused by insufficient air pressure supply. Please follow the troubleshooting steps below:

Step 1: Check Air Pressure Verify whether the compressed air pressure is operating within the required range for normal milling machine performance. Low air pressure may affect spindle operation, automatic tool changing, or pneumatic system stability. 

Step 2: Check the Power Connection Ensure the power plug and socket connection are secure and properly connected. Loose electrical connections may interrupt machine communication or system startup. 

Step 3: Restart the Machine Turn off the machine completely, wait approximately 2 minutes, and then restart the system. This process helps reset temporary system abnormalities or communication interruptions.

Q3: What Is the Recommended Sintering Curve for Glass Ceramic Materials?

Answer: The recommended glass ceramic sintering/crystallization curve is shown in the image below.

Q4: How to Solve YRC-8Pro Alarm 1020 [%d] “Main Program Loading Failed”?

Answer: If the YRC-8Pro milling machine displays alarm 1020 [%d] – Main Program Loading Failed, please follow these troubleshooting steps: 

a. Check Whether the Processing Program Exists Verify that the machining program file is correctly stored in the controller system. 

b. Verify the Integrity of the Program File Please check whether the machining program file remains intact and has not been damaged during transfer or storage. An incomplete or abnormal file may cause the program loading process to fail. 

c. Verify the File Format Ensure that the machining file is in a supported NC format. Unsupported or incorrectly generated files may fail to load properly. 

d. Reset the Alarm and Reload the Program If the file exists and the format is correct, please reset the machine alarm, clear the fault notification, and attempt to reload the program again.

Q5: Why Do Dentures or Bridges Frequently Fracture After Processing?

Answer: Frequent restoration fracture is commonly related to incorrect sintering support frame configuration or improper support placement during the sintering stage. The three values highlighted in red in the image represent the standard sintering support parameters. For conventional restorations (excluding implant-supported half-arch restorations or large anatomical half-arch cases), a standard support thickness of 2.0 mm is generally recommended.

Important Notes for Support Placement Support structures should not be placed at pontic/missing tooth areas. In bridge restorations with multiple missing teeth, improper support placement may generate excessive shrinkage force during sintering, increasing the risk of: 

• Restoration deformation 
• Structural stress concentration 
• Cracking or fracture after sintering

 

For thicker missing tooth areas, connecting supports near thicker wall sections of the sintering frame may lead to stronger shrinkage stress. Special attention is recommended when processing: 

• Bridges exceeding 6 units 
• Large-span restorations with pronounced curvature 
• Half-arch implant-supported prostheses 

In these cases, support distribution and pontic positioning should be carefully evaluated.

Q6: The Sintering Crucible of the YRC-F10+ Has Cracked. Will It Affect Normal Operation?

Answer: Yes, a cracked sintering crucible may affect normal operation and replacement is recommended. Although the crucible may still function temporarily during slow sintering cycles, continued use is not advised because: 

The crack may gradually expand over time 

Structural stability may decrease during repeated thermal cycles 

Frequent fast sintering can significantly shorten crucible lifespan 

Since the crucible is a consumable component, timely replacement is recommended to maintain stable sintering performance and restoration consistency.