3. adapted from quizlet: ryanef123 FP 12 - Master Cast Fabrication and Pindexing (Dr. Akhtar)

What is the correct order for clinical procedures?

- Try-in / Insertion / Cementation

- Examination (Alginate Impression + Bite registration); Facebow Transfer (Diagnostic and treatment planning)

- Final Impression; Interocclusal Record; Shade Selection

- Recare and Maintenance

- Tooth Preparation; Temporization

1. Examination (Alginate Impression + Bite registration); Facebow Transfer (Diagnostic and treatment planning)

2. Tooth Preparation; Temporization

3. Final Impression; Interocclusal Record; Shade Selection

4. Try-in / Insertion / Cementation

5. Recare and Maintenance

What is the laboratory procedure after visit 1: Examination (Alginate Impression + Bite registration); Facebow Transfer (Diagnostic and treatment planning)?

Create study cast and mount

What is the laboratory procedure after creating a study cast and mounting?

- Diagnostic wax up

- Temporary template

What is the laboratory procedure after visit 3: Final Impression; Interocclusal Record; Shade Selection?

Lab prescription/Send out:

- Master Cast

- Pindexing

- Die trimming

- Mounting

What material do we use for preliminary impression?

Alginate

What material do we use for final impression?

Polyether or Polyvinyl siloxane (PVS)

What material do we use for study/diagnostic cast?

Type III dental stone

What material do we use for definitive cast/master cast?

Type IV or V dental stone

What type of cast is mounted on an articulator?

Working cast

Define the following:

Definitive reproduction of prepared teeth used to fabricate a prosthesis

Cast

Define the following:

Highly accurate replica of single tooth generally used to make crown/inlay

Die

Define the following:

Replica used to observe a patient's oral structures

Model

Define the following:

- The positive reproduction of the form of a prepared tooth in suitable hard substance

- Exact reproduction of the prepared tooth

- All surfaces must be accurately duplicated without voids or bubbles

- Remaining tooth structure immediately cervical to the finish line should be easily discernible

- Give adequate access to the margins for wax-up

Die

Final impression should have ideally ___-__mm visible tooth structure

0.5-1 mm

All of the following are requirements for a good casts EXCEPT:

A) Exact reproduction of both prepared and unprepared tooth surfaces

B) Free of voids and bubbles, especially along the finish lines of the prepared teeth

C) Should include all relevant soft tissues including all edentulous spaces and residual ridges.

D) Certain portions of the cast must be distortion free

E) The Cast and the Die must be trimmed to ensure access for carving the wax pattern along the margins

D - ALL portion of cast must be distortion free

ID cast and die system:

- Single die for wax coping and margins

- Solid cast for proximal contacts and occlusion

Working cast with a separate die

ID cast and die system:

- Retained by pins in a base.

- Dowel pin technique - Di-lock tray technique - Pindex system.

Working cast with removable dies

ID the technique

Dowel pin technique

ID the technique

Pindex system

ID the technique

Di-lock tray technique

ID the technique

DVA Model System

ID the technique

Zeiser

ID the technique :

- A reverse drill is used to create a master cast with dies that can be removed and replaced repeatedly with great precision

- The impression is poured without positioning and attaching dowel pins before hand

- The machine accurately drills parallel holes from the underside of a trimmed cast

Pindexing technique

Which of the following is false regarding impression pouring in the pindexing technique?

A) Stone is added to the impression in large increments above the preparation

B) Tray is tilted to fill the preparation

C) Sufficient stone added to allow for trimming

A - added in SMALL increments

Which of the following is false regarding cast trimming in the pindexing technique?

A) First trim bottom cast

B) Cast height exclusive of the teeth should be 15mm thick, parallel to the occlusal plane and flat and smooth

C) Palate/tongue area is trimmed with an arbor band

D) Palate/tongue area is trimmed to be V shape & finished with a lab carbide bur

E) Slight bevel or taper of the lingual side of the cast or both facial and lingual sides

D - should say U-shaped!!

What shape is the cast shaped into during the pindexing technique?

U-shaped

Why do you place a bevel at the red line here?

Helps with the ability to separate the cast from stone later

Sawing lines are ____ degrees to the arch

90 degrees

T/F: 2 pins per section, 2 pins per die, 2 pins for edentulous ridge

True

Where are long pins placed on the die?

Facial side

Where are short pins placed on the die?

Lingual side

Pindex pins are ____ parallel holes and secured with super glue

2

Placement of white/black sleeves on the ________ pins

Long

Placement of gray sleeves on the ________ pins

Short

bi-pin is ___ hole

1 hole

Which pins are placed first: shorter or longer pins?

Shorter pins

To lubricate the base, the bottom of the cast can be lightly coated with what? (2)

Petroleum or Super-Sep

Where do you place utility wax?

On the ends of the long pins

Where should you paint a thick layer of yellow stone before sealing the cast?

Base of the pins (use vibrator plate)

What can we use to section the dies?

Saw

When sectioning the die, it should be parallel or slightly __________ occlusally

Divergent

The following is the purpose of what?

- To facilitate finishing of the margins of the wax pattern

- Emergence profile/cervical contour

- Flush with tooth surface below the finish line

Die trimming and ditching

Physiologic ditching occurs at __ degrees, if no or very short axial contour exist

5 degrees

What side of the tooth is indicated by the pin at the blue box?

Lingual (short pin)

What side of the tooth is indicated by the pin at the red box?

Facial (long pin)

What has the following characteristics?

- Cover the pin with utility wax

- Place the interocclusal record between the pinned master cast and the opposing cast

- Fix the casts with tongue depressor and sticky wax or silicon glue

Cast mounting

Define the following:

Involves using digital scanning and CAD/CAM (Computer-Aided Design/Computer-Aided Manufacturing) technologies to create virtual models of dental casts and dies

Digital ditching (ditching digitally)

Digital fabrication of casts and dies offers several advantages such as what? (3)

- Increased accuracy

- Increased efficiency

- Ability to easily store and transmit digital files

Define the following:

A dental scanner is used to capture precise digital images of the teeth and surrounding tissue

Digital scanning

Define the following:

The digital scans are then imported into CAD software, where dental technicians can manipulate the digital models to create virtual working casts and dies

CAD modeling

Define the following:

Refers to the process of creating space or clearance around specific areas of a dental model to accommodate restorative materials like crowns or bridges

Virtual ditching

Define the following:

Once the virtual models are finalized, they can be sent to a milling machine or 3D printer for fabrication. The CAM (Computer-Aided Manufacturing) process involves converting the digital design into physical restorations using materials such as ceramics, resins, or metals.

CAM Fabrication

Define the following:

After fabrication, the dental restorations may undergo additional post-processing steps such as polishing, staining, or glazing to achieve the desired aesthetics and surface characteristics

Final finishing

What technique has the following steps?

1. Impression pouring

2. Cast trimming

3. Marking the pin position

4. Pindexing

5. Pin placement

6. Lubricant for the base

7. Placing the utility wax

8. Base forming

9. Base trimming

10. Section the die

Pindexing Technique

What technique has the following steps?

1. Digital scanning

2. CAD Modeling

3. Virtual Ditching

4. CAM Fabrication

5. Final Finishing

Digital Fabrication of the Cast and Dies