Introduction to CAD/CAM: Scanning and Comparing

Flashcards reviewing CAD/CAM scanning fundamentals, CEREC Primescan operation, prepCheck step-by-step workflow, and associated educational research.

Who is known as the "Godfather" of CAD/CAM in dentistry?

Professor François Duret, who developed and patented a CAD/CAM device in 1984.

What does the abbreviation STL stand for in 3D scanner file formats?

Standard Tessellation Language.

Where should an operator grip an Intra Oral Scanner (IOS) like the CEREC Primescan when removing it from its holder?

At the base (the black and white colored area), and never by the tip.

What are the three ways to turn on the CEREC Primescan scanner?

1. Pick up the scanner automatically during the acquisition phase; 2. Press the foot pedal under the unit; 3. Use the On/Off switch on the monitor.

How should the scanner be positioned relative to the tooth at the start of a scan?

Held like a pen or stylus, positioned perpendicular to the teeth directly over the prep on the incisal edge, maintaining a distance of $2\,\text{mm}$.

What is the recommended sequence of tooth surfaces to scan during an anterior digital scan?

Incisal (or occlusal) surface first, followed by facial (or buccal) surfaces, and finally lingual surfaces.

What are the key criteria for a successful anterior digital scan?

The scan must extend from 1st premolar to 1st premolar, fully capture the wax-up and adjacent teeth, include interproximal embrasures, and record $2\text{ to }3\,\text{mm}$ of facial soft tissue.

What do white areas on a digital scan represent?

Inadequate data density, indicating that the operator must return to those areas and rescan them.

Which Design Mode must be selected during the Administration Phase in CEREC software prior to running prepCheck?

Biogeneric Individual.

What is the correct procedure for drawing the margin on a wax-up during the Model Phase in CEREC software?

In Manual mode, double-click to start, single-click incrementally 360 degrees around the wax-up (crossing over the incisal edge on the mesial and distal sides), and double-click the starting red dot to finish.

How should the 3D digital model be oriented when setting the insertion axis in the Model Phase?

Positioned looking straight down on the incisal edge of the #8 wax-up.

In prepCheck software, what does a green color on the evaluated wax-up indicate?

The wax-up is overcontoured, meaning wax needs to be removed.

In prepCheck software, what does a red color on the evaluated wax-up indicate?

The wax-up is undercontoured, meaning wax needs to be added.

In prepCheck software, what does a blue color on the evaluated wax-up indicate?

The wax-up is within $\pm 0.1\,\text{mm}$ of the Master Template (Typodont) Tooth.

What functions do the spheres and arrows perform when using the Slice Tool in prepCheck?

The spheres control the angle(s) of the slice, while the arrows adjust the location of the slice at a constant angle.

In the Slice Tool cross-section view, what do the green and blue lines represent?

The green line represents the Master Template (Typodont) Tooth, and the blue line represents the Sample Wax-Up.

In the preclinical study by Chiang et al., what percentage of student self-assessments changed from satisfactory to unsatisfactory after reviewing their work with Compare Software?

$20\%$ of total responses (out of $24\%$ total changed responses).

According to the study by Chiang et al., which rubric category exhibited the greatest change in student self-assessment after using CAD/CAM comparison software?

Incisal Edge ($49\%$ change).

Which course selection and template name should be chosen in prepCheck-Exporter for the #8 central incisor exercise?

Course "DENTD 1500" and Template "#8 Crown Wax-Up".

What are the recommended Display Objects visibility settings in prepCheck during analysis?

Master Preparation set to $50\%$ and Preparation set to $100\%$.