Digital imaging 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:
- CEREC Primescan, Omnicam, Bluecam (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 & 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 as ceramics, zirconias, alloys, resins or wax:
Milling machine
CEREC system is used to create:
inlays, onlays, crowns & bridges
What type of light is used with CEREC, what is else is required?
Visible blue light (LED) & powder
What is the imaging technique differences for CEREC Omnicam vs. CEREC Bluecam?
Omnicam: continuous data aquisition
Bluecam: 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; multiunit restoration on natural teeth; implant restorations; & Removable prosthesis
True
What CAD/CAM more cost effective?
60-70% savings in lab bills & reduction in labor
T/F: The only disadvantage to CAD/CAM is the 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/CA, technology have acceptable results for:
- 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 intraoral scanner?
Direct data acquisition
What type of CAD/CAM data acquisition can be described as the data is obtained in the lab either from an impression or 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 & 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 capacity
False- already showing improvements in workflow
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 work flow process:
- diagnostics
- treatment planning
- design
- fabrication
- delivery
What step of the digital workflow process is being described below:
-Digital imaging (X-rays, sensors)
Step 1- diagnostics
What step of the digital workflow process is being described below:
-Digital intraoral scanner
Step 2: Treatment planning
What step of the digital workflow process is being described below:
-3D software
Step 3: Design
What step of the digital workflow process is being described below:
-Milling/3D printing
Step 4: Fabrication
What step of the digital workflow process is being described below:
-Completed crown
Step 5: Delivery
Put the following in chronological order as they would place in practice: (specify what occurs at first & second appointment)
-file sent to lab
-finsish
-receive from lab
-scan
-seat crown
-fabricate restoration
-design restoration
- Scan (First appointment)
- File sent to lab
- Design restoration
- Fabricate restoration
- Finish
- Receive for lab
- Seat crown (second appointment)
Compare the initial cost of conventional vs. digital workflow:
Analogue: Initial cost - includes VPS & registration materials (~$50)
Digital: Initial cost- includes scanner ($20-30k) & milling unit ($110-120k)
Compare the additional cost of conventional vs. digital workflow:
Analogue: Additional costs- includes trays, dispensers, stone, lab cost, shipping
Digital: Additional costs- includes electronic la prescriptions, blocks, bur, maintenance
What has more chair side time- Conventional or digital workflow?
Conventional (analogue)
What is the chair side time for teeth & for implants for conventional workflow- compare this to digital:
Analogue:
teeth- around 41 min
implants- around 43 min
Digital
teeth- around 13 min
implants- around 30 min
What factors contribute to the chairside time with conventional workflow?
- tray selection or custom tray
- mixing time
- setting time
- remake
- opposing arch
- inter-occlusal records
- disinfection
- shipping time
What factors contribute to the chairside 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 the the longer laboratory time required for conventional workflow?
- disinfection
- pour the impressions
- setting time
- mount casts
- ditch the dies
- wax-up & fabrication
- shipping
- restoration
What contributes the the shorter laboratory time required for digital workflow
- received electronically
- design
- cast & prosthesis
- restoration
______ is a MUST for both workflows (3)
1.) tissue displacement
2.) dry field
3.) 0.5mm 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 & ______
- _____ are still recommended for full arch restorations
- crowns & FPDs
- shortened treatment times
- conventional impressions
According to studies:
_____ was observed regarding the marginal gap of single-unit ceramic restorations obtained from digital or conventional impression techniques
No significant difference
According to studies:
marginal & internal gaps with conventional techniques were _____ than the digital techniques
Greater than
According to studies:
the digital impression technique provided ______ marginal & internal fit of fixed restorations compared to conventional techniques
better
Conclusions from multiple studies state that Digital impressions:
- are more accurate
- are more time effective
- provide excellent clinical results
- allows for immediate evaluation of prep & 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)
- improved 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
