Digital Dentistry Flashcards
The use of computer programs to create two- or three-dimensional (2D or 3D) graphical representations of physical objects:
CAD (Computer Aided Design)
The use of computer software to control machine tools and related machinery in the manufacturing of work pieces:
CAM (Computer Aided Manufacturing/Milling)
What do we need in order to apply the digital imaging concept to practice? (3)
- intra oral scanner
- designing software
- production unit
A production unit that works via 3D printing is considered:
Additive
A production unit that works via milling is considered:
subtractive
Available digital imaging systems include: (6)
- CEREC Prime Scale, Omnicam, Bluecame (Sirona)
- Tiors, 3 Shape (3D Biocad)
- iTero digital scanner
- E4D Dentist
- Medit
- Lava COS
Requirements of intraoral scanner include: (4)
- easy to use
- accuracy
- software capability and speed
- cost
The use of additive manufacturing to create dental prosthesis such as aligners, dentures, and crowns:
3D printing
Designed to cut crowns, bridges, copings, frameworks, implant abutments and more from materials such ceramics, zirconia, alloys, resins or wax:
Milling machine
CEREC system is used to create:
inlays, onlays, crowns, and bridges
What type of light is used with CEREC? What else is required?
Visible blue light (LED) and powder
What is the imaging technique differences for Cerec omnicam vs. Cerec bluecam?
Omnicam: continuous data acquisition
Blucecam: multiple shots joined together
Which form of cerec 3D scans IN COLOR?
omnicam
Which form of CEREC requires powder?
Bluecam
The following advantages coincide with:
- Powder free
- Easy handling
- Precise 3D image in natural color
CEREC Omnicam
The following advantages coincide with:
- High precision
- Rapid scan in powder coated surfaces
- Easy to use
CEREC Bluecam
What scan procedure does CEREC Primescan utilize?
Dynamic depth scan
What scan procedure does CEREC Omniscan utilize?
Triangulation
T/F: With CAD/CAM we can do single restorations on natural teeth; multi-unit restorations on natural teeth; implant restorations; and removable prosthesis
True
What makes CAD/CAM more cost effective?
60-70% savings in lab bills and reduction in labor
T/F: The only disadvantage to CAD/CAM is the slower production process
False- CAD/CAM has a faster production process
The multilevel quality improvement through digital technology is recognized in: (4)
- workflow & efficiency
- record keeping
- data fidelity
- therapeutics
Posterior single tooth restorations fabricated from intraoral scans by using CAD/CAM technology have acceptable results for: (4)
- shade
- contour
- marginal adaptation
- occlusion
CAD/CAM classification is based on: (3)
- Data acquisition
- Accessibility to STL files
- Production of final restoration
What type of CAD/CAM data acquisition can be described as the data is obtained from the patients mouth via intra oral scanner:
Direct data acquisition
What type of CAD/CAM data acquisition can be described as data obtained in the lab either from an impression or a stone cast via bench scanner
Indirect data acquisition
CAD/CAM files that are NOT dependent on the manufacturer, and can be used with any software to fabricate the final restoration:
Open files
CAD/CAM files that are controlled and manipulated by the owner/manufacturer:
Closed files
Is a provisional needed for a chair-side production utilizing CAD/CAM:
No
T/F: Digital technologies have the potential to improve the workflow from diagnosis, planning to treatment, but are so new they have not reached that capacity.
False- already showing improvements in workflow form diagnosis, planning, to treatment
T/F: Intraoral scanning is faster and substantially more comfortable (compared to old school impressions)
True
Intraoral scanners can greatly increase:
- productivity
- efficiency
- accuracy
List the steps of the digital workflow process:
- Diagnostics
- Treatment Planning
- Design
- Fabrication
- Delivery
What step of the digital workflow process is being described?
- Digital imaging (x-rays & sensors)
Step 1: diagnostics
What step of the digital workflow process is being described?
- Digital intraoral scanner
Step 2: Treatment planning
What step of the digital workflow process is being described?
- 3D software
Step 3: Design
What step of the digital workflow process is being described?
- Milling/ 3D printing
Step 4: Fabrication
What step of the digital workflow process is being described?
- Completed crown
Step 5: Delivery
Put the following in chronological order as they would take place in practice (specify what occurs at first and second appointment)
- file sent to lab
- finish
- receive from lab
- scan
- seat crown
- fabricate restoration
- design restoration
- Scan (first appointment)
- File sent to lab
- Design restoration
- Fabricate restoration
- Finish
- Receive from lab
- Seat crown (Second appointment)
Compare the initial cost of conventional vs. digital workflow
Analogue: Initial cost includes VPS, and registration materials (~$50)
Digital: Initial cost includes scanner (20-30k), and milling unit (110-120k)
Compare the additional cost of conventional vs. digital workflow:
Analogue: Additional cost includes trays, dispenser, and stone, lab cost, & shipping
Digital: Additional cost includes electronic lab prescriptions, blocks, burs, and maintenance
What has more chair side time, conventional or digital workflow?
Conventional (Analogue)
What is the chair side time for teeth and for implants for conventional workflow? Compare this to digital
Analogue:
teeth: ~41 min
implants: ~43 min
Digital
teeth: ~13 min
implants: ~30 min
What factors to contribute to the chair side time with conventional workflow?
- Tray selection or custom tray
- Mixing tie
- Setting time
- Remake
- Opposing arch
- Inter-occlusal records
- Disinfection
- Shipping time
What factors contribute to the chair side time with digital workflow?
- Learning curve
- Scan (prep, opposing & buccal)
- Evaluate the scan
- Rescan
- Lab prescription
Which requires more laboratory time? Digital or conventional workflow?
Conventional (analogue)
What contributes to the longer laboratory time required for conventional workflow?
- Disinfection
- Pour the infections
- Setting time
- Mount the casts
- Ditch the dies
- Wax up and fabrication
- Shipping
- Restoration
What contributes to the shorter laboratory time required for digital workflow?
- received electronically
- design
- cast & prosthesis
- restoration
____ is a MUST for both work flows (3)
1) Tissue displacement
2) Dry field
3) 0.5 mm of uncut tooth structure apical to the finish line
According to studies,
- There was the same level of accuracy for ____ & ____
- Digital impressions showed clinically accepted results and ____
- ____ are still recommended for full-arch restorations
- crowns and FPDs
- shortened treatment time
- conventional impressions
According to studies,
_____ was observed regarding the marginal gap of single-unit ceramic restorations obtained fro digital or conventional impression techniques
No significant difference
According to studies,
Marginal and internal gaps with conventional techniques were ____ than the digital technique
Greater than
According to studies,
The digital impression technique provided ____ marginal and internal fit of fixed restorations compared to conventional techniques
better
Conclusions from multiples studies state that digital impressions:
- Are more accurate
- Are more time effective
- Provide excellent clinical results
- Allows for immediate evaluation of prep and margins
T/F: Digital techniques show superior accuracy
True
Some advantages of the optical/digital technique include: (4)
- more comfortable for the patient
- better marginal fit (both clinically accepted)
- improve dentist/lab communication
- decrease in turn around time
T/F: For full arch impressions, digital impressions should be used but conventional impressions can be clinically acceptable too.
False- digital impressions can be clinically acceptable but you should use conventional impressions
