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FIXED > lecture 8- intro to digital dentistry, scanning > Flashcards

lecture 8- intro to digital dentistry, scanning Flashcards

1
Q

The use of computer programs to create
two- or three-dimensional (2D or 3D)
graphical representations of physical objects

A

CAD: computer aided Design

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2
Q

The use of computer software to control machine tools and related machinery in the
manufacturing of work pieces

A

CAM: computer Aided Manufacturing/milling

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3
Q

➢Point Cloud Meshing?

A

collection of data points called point cloud is used to depict a real world object

combine multiple scans to create complete model

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4
Q

CAD/CAM is often saved and stored as

A

.stl file (standard triangulation language)

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5
Q

CAD/CAM is a file format which is an openly documented format for
describing the surface of an object as a __________,
that is, as a representation of a 3-dimensional surface in
triangular facets

A

triangular mesh

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6
Q

What do we need to apply this concept to practice?

A
  1. intra oral scanner
  2. designing software
  3. production Unit
    -additive: 3D printing
    -subtractive: milling
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7
Q

Some available systems for CAD/CAM?

A
  • CEREC Primescan, Omnicam or
    Bluecam (Sirona)
  • Tiors, 3 Shape (3D Biocad)
  • iTero digital scanner
  • E4D Dentist
  • Medit
  • Lava COS
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8
Q

Requirements of intra oralscanner

A
  • Easy to use
  • Accuracy
  • Software capability and speed
  • Cost
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9
Q

It is the use of additive manufacturing to create dental
prostheses such as aligners and dentures

A

3D printing

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10
Q

Designed to cut crowns, bridges, copings, frameworks,
implant abutments and more from materials such as
ceramics, zirconia, alloys, resins or wax

A

milling machine

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11
Q

Characteristics of CEREC system

A
  • Inlays/ Onlays, Crowns, & bridges
  • Visible Blue Light (LEDs)
  • Powder is required for some
    scanners
  • Digital on-screen articulation
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12
Q

advantages of
1. CEREC omnicam
2. CEREC bluecam

A
  1. CEREC omnicam:
    -powder free
    -precise 3D image in natural color
    -8-12 min
  2. CEREC bluecam
    -high precision
    -rapid scan in powder coated surfaces
    -easy to use
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13
Q

What can we do with CAD/CAM?

A
  1. Single tooth restorations on natural teeth:
    * Crowns
    * Implant restorations
    * Inlays
    * Onlays
    * Veneers
  2. Multi-unit restorations on natural teeth
    * 3-unit bridges
  3. Implant restorations
    * Implant planning & surgical guide
    * Custom abutments
    * Cement retained and screw retained crowns
    * Titanium milled bars for full arch restorations
    * Frameworks for implant bridges
    * Full arch monolithic FDP
  4. Removable prostheses
    * RPD Frameworks
    * Complete Dentures
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14
Q

Why use CAD/CAM?

A
  1. Faster turn around for fixed restorations
  2. Can delegate scanning to Auxillary team members
  3. Patients believe high tech is better
  4. Possible to have less human error in production process
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15
Q

The multilevel quality
improvement afforded
through digital
technology is recognized
in

A

workflow and
efficiency, record
keeping, and data safety

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16
Q

CAD/CAM Classification based on:
1
2
3

A
  1. data Acquisition
  2. Accessibility to STL Files
  3. Production of final restoration
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17
Q

Data Acquisition:

A
  • Direct
  • Indirect
18
Q

Accessibility to STL Files:

A
  • Open system
  • Closed system
19
Q

Production of final restoration:

A
  • Chair-side Production
  • Laboratory Production
  • Centralized Production
    Centers
20
Q

The data is directly obtained from the patient’s mouth via intra
oralscanner

A

data acquisition (direct)

21
Q

The data isindirectly obtained in the lab either from an
impression or a stone cast via bench scanner

A

indirect (data acquisition)

22
Q

Are not dependent on the manufacturer, can be used with
any software to fabricate the final restoration

A

open files

23
Q

The data is controlled and manipulated bythe owner
(manufacturer)

A

closed files

24
Q

Production of final restoration:

A
  1. Chair-side Production: No provisionalization is needed
  2. Laboratory Production: dental laboratory scanner and designing software ->CAD/CAM
  3. Centralized Production: production center -> CAM
25
Q

Workflow Between Lab and
Practice

A

digital workflow

26
Q

Digital technologies improve the
workflow from diagnosis,
planning, and treatment

-Intraoral scanning is faster and
substantially more comfortable
-Intraoral scanners can increase
productivity, and efficiency

A

digital workflow

27
Q

digital workflow steps

A
  1. first appt scan
  2. file sent to lab
  3. design restoration
  4. fabricate restoration
  5. finish
  6. receive from lab
  7. second appointment seat crown
28
Q

Conventional Vs digital workflow initial cost

A

analogue(conventional)
initial cost: VPS, registration materials ~$50

digital initial cost:
scanner $20k-$30k
milling unit $110k-$120K

29
Q

Conventional Vs digital workflow additional cost:

A

analogue: trays, dispensers, and stone, lab cost, shipping

digital: electronic lab prescriptions, blocks, burs, and maintenance, lost time and production if machine goes down

30
Q

Conventional Vs digital workflow time
analogue/conventional:

A
  • Tray selection or Custom tray
  • Setting time
  • Remake
  • Opposing arch
  • Inter-occlusal records
  • Disinfection
  • Shipping time
  • Disinfection
  • Pourthe impressions
    or scan impressions
  • Setting time of stone
  • Mountthe casts
  • Ditch the dies
  • Scan dies
  • Wax-up and/or
    fabrication
  • Shipping
  • Restoration Delivery
31
Q

Conventional Vs digital workflow time digital:

A
  • Learning curve
  • Scan (prep, opposing & buccal)
  • Evaluate the scan
  • Rescan
  • Lab prescription
  • Received (Electronically)
  • Design
  • Scan cast/mill/print model
  • Restoration milled
  • Shipping
  • Restoration delivery
32
Q

Conventional Vs digital workflow
Tissue Displacement:

A
  1. MUST for both
  2. dry field is a MUST for both workflows
  3. 0.5mm of uncut tooth structure apical to the finish line is required
33
Q

are still recommended for full-arch
restorations

A

conventional impressions

34
Q

was observed regarding the marginal gap
of single-unit ceramic restorations obtained from digital or
conventional impression techniques

A

no significant difference

35
Q

Some advantages of the Optical/Digital technique:

A
  1. more comfortable to the patient
  2. equal marginal fit (both clinically accepted)
  3. improves dentist/lab communication
  4. cuts down the turn around time
36
Q

for full-arch impressions

A
  1. use conventional impression
  2. digital impression are not as accurate across an arch
37
Q

Posterior single tooth restorations fabricated from
intraoral scans by using CAD/CAM technology
have acceptable results for

A

shade, contour,
marginal adaptation and occlusion

38
Q

survival rates

A
  • 88.7 % up to 17 years of clinical service (Otto et al.
    2008)
  • 88.8% in 5.5 years vs 93.3% for gold (Ferdelin, 2010)
  • 97% in 5 years 90% in 10 years (Fasbinder, 2006)
  • 98.4% in 9 years (Posselt 2003)
39
Q

when prepping crowns reduce an additional ____of ____ and ___ tooth surfaces compared to standard prep for increased strength

A

0.25-0.5mm
of facial and occlusal

40
Q
A

FIXED (8 decks)

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