Digital impression.typescand techniquevpptx

impression scan intraoral and extra oral digital scaning

1. Digital impression

2. introduction Computer-aided design and computer-aided manufacturing (CAD/CAM) have been employed in the fabrication of restorations, especially ceramic crowns and fixed dental prostheses (FDPs), since the 1980s CEREC was the first commercially available digital impression system. 2

3. it is possible to scan a patient’s oral cavity, design and create restoration and finally bond it in the patient’s mouth in the course of one day.

4. Advantages of digital impressions: Easy to correct, manipulate, or recapture images. No use of impression material and no need for trays and gypsum. Do not need to disinfect before sending information to the laboratory Real-time visualization and evaluation Saving time and increasing patient satisfaction (e.g. gag reflex). 4

5. disadvantages of digital impressions: Initial cost of equipment and software maintenance fees Cannot capture subgingival margins if obscured with blood, saliva, or tissue. Unable to accurately capture images of the edentulous arches Scanning patterns need to be followed as per manufacturer’s recommendations Learning curve can be difficult for some individuals 5

6. CAD-CAM is divided into: 6 CAI Computer-aided impression Scanning through intraoral or extraoral scanners CAD Computer-aided design Using the software to design and visualize the restoration CAM Computer-aided manufacturing Software gives orders to the milling machine to fabricate the restoration

7. How does it works 7

8. Gathering the information or data from the prepared teeth and the adjacent structures using a scanner and then converted into optical impressions. A scanner is a technological device that uses light and special sensors to obtain digitalized images of any object. It could be either: Intraoral that scans the preparation inside the patient’s mouth. Extraoral that scans a gypsum cast (3D model). Data acquisition: Fasbinder DJ. Digital dentistry: innovation for restorative treatment. Compend Contin Educ Dent 2010;31(4):2–11.

9. Intraoral scanning Higher cost (machines) Easier in use Can scan intra orally or extra orally Slower in full arch Cant scan big objects as articulator

10. Extraoral scanning Less expensive Needs impression and ditching for the cast in case of preparation Only work extra orally Faster in full arch and articulator scanning also in scanning impression

11. 1- Chair side 2- Laboratory system chairside CAD/CAM full system Chairside scanners/lab milling (Integrated chairside laboratory system) has its own scanner and milling units Example cerec has only a scanner without designing capabilities must be connected to an open laboratory scanner for designing of the restoration. Example; Carestream CS 3500 General classification of CAD/CAM systems Abdullah A.O, Muhammed F.K, Zheng B, Liu Y. An Overview of Computer Aided Design/Computer Aided Manufacturing (CAD/CAM) in Restorative Dentistry. J Dent Mater Tech 2018; 7(1): 1-10.

12. laboratory CAD/CAM CAD unit CAM unit 2-Laboratory system has its own scanner to scan impression or cast and milling units Example Planmeca has only the scanner Example 3 Shape; Dental Wings 7 series retains the milling machine unit Example Sirona; M5

13. They vary from each other in terms of key features such as Working principle, Light source The necessity of powder coat spraying, Operative process And output file format

14. CAD/CAM systems and data sharing: 15 Miyazaki T, Hotta Y, Kunii J, et al. A review of dental CAD/CAM: current status and future perspectives from 20 years of experience. Dent Mater J 2009;28(1):44–56.

15. ERRORS DURING INTRAORAL SCANNING 16

16. Inadequate Gum Retraction Issue : If the gum is not retracted properly, the scanner may not capture the full margin, leading to inaccuracies. Use a retraction cord or other methods to expose the margin clearly before scanning. 17

17. 2. Moisture and Saliva Interference MOISTURE, SALIVA, OR BLOOD ON THE TOOTH SURFACE CAN AFFECT SCAN QUALITY AND CREATE DISTORTED IMAGES. 18 keep the area dry by using air or suction to clear away saliva. some scanners may also require powder for better imaging.

18. 3. Incomplete Coverage of the Arch Issue: Missing areas, especially on hard-to-reach posterior teeth, can lead to an incomplete Ensure full coverage by systematically scanning from different perspectives, particularly for posterior teeth.

19. 4. Poor Scanning Technique Issue : Moving the scanner too quickly or inconsistently can lead to missed details or uneven scans. Maintain a smooth, steady motion and follow the scanner’s recommended technique, covering all surfaces systematically.

20. 5. Incorrect Bite Registration Issue : Misalignment of the upper and lower arches during the bite scan can lead to occlusal errors. Ensure the patient is in a natural bite position and confirm the bite scan alignment before saving it.