#8 RCT Teeth Projects

Dr. Peng 2/12

What is a Fiber Post?

Fiber posts are usually used for more _____ areas because

Esthetic; they are translucent or opaque resin materials that reflect the natural hues of the tooth and eliminates shadows through all-ceramic crowns at gingival/crown interface

What is the elasticity of fiber posts compared to dentin?

Similar to dentin, so it is less catastrophic, it will fracture the post rather than fracture the tooth

What is monoblock?

When the post, cement, and dentin behave like one single unit. Fiber posts have a modulus of elasticity similar to dentin, so they flex similarly and distribute stress more evenly

What is the difference between Fiber Posts and Ceramic Posts?

Fiber Posts are less brittle than ceramic root posts/crown interface

Which has superior esthetics?

The right side image; restoration with fiber lux

The flexural strength of fiber posts is

1600MPa

The compressive strength of Fiber Posts is

630MPa

What is the material composition of fiber posts?

• 60% Glass Fiber

• 40% Resin

What is the rounded, undercut double head design used for?

Optimal core retention

How many sizes of fiber posts are there?

6; the correspond to parapost drill size

• Black

• Purple

• Red

• Blue

• Yellow

• Brown

The cylindrical post design is ideal for

Universal post application

What is the translucency important for?

Light-transmitting on-command cementation

How can you adjust your fiber post?

On head or apical end

Rounded, undercut multi-head designs minimizes stress in the core material due to

Polymerization shrinkage

Using computer analysis and imaging, areas of stress concentrations can be predicted. This color indicates areas of greatest stress

Red

Some posts have heads with sharp edges or angles that create stress points in the core material. This can lead to

Micro-fractures

The microscopic unidirectional fiber clusters show

A cross section of fiber post that strengthens the structure without compromising flexibility

The translucency also helps with radiographs. Why?

You can take a radiographic image to determine the length of the post you want due to the radiopacity

A taper lux is ideal for

Narrow canals and metal-free, high aesthetic restorations

What is the post design for taper lux?

Cylindro-conical

What is the head design for taper lux?

Three head design with antirotation surfaces

What is the fixing type for taper lux

Adhesive- light and chemical curing

Where do you adjust the length of the taper lux?

At the head

How many sizes are there of taper lux?

4

What are the indications for fiber lux?

Ideal for metal-free and high aesthetic restorations

What is the post design of fiber lux?

Cylindrical

What is the head design for fiber lux

Two head design with antirotation surfaces

How would you adjust the length of a fiber lux?

At head and post tail

How many sizes are offered for fiber lux?

6

What are the indications for fiber white posts?

Ideal for metal-free and esthetic restorations. It also masks discolor roots

What is the material of fiber white posts?

Opaque fiber-resin matrix

How are fiber white posts fixed in the mouth?

Adhesive- chemical curing NOT light

For the parapost fiber post-clinical application, how much length do you need to preserve of your apical seal?

3-5mm

What is the application procedure?

1. Apply rubber dam

2. Remove gutta percha and leave 3-5mm of apical seal

3. Use the parapost drill to create the space of the size you want

4. Check the seat of the fiber post and cement

5. Buildup core with resin material and prep the tooth

6. Take impression

Cement your fiber post with

RelyX Unicem 2 Automix Cement

What is the advantage of RelyX Unicem 2 Automix Cement over others for post cementation?

Automixing and a small dispensing endo tip by which the cement can be placed to the depth of the canal with ease

What is lentulo spiral

Flexible stainless steel dental instrument designed to evenly distribute cements, throughout the root canal system

T/F: It is recommended to use lentulo spiral with RelyX uNicem 2?

False

What are some qualities of RelyX Unicem 2

• Self-Etching

• Self-Adhesive

• Dual-Cured

• Bonding and condition of the tooth structure are not necessary

Working time from start of mixing for RelyX Unicem 2

2 minutes

What does it mean that RelyX Unicem 2 is dual-cured?

You can either light cure it for 40 seconds, or let it set for 6 minutes

T/F: It is recommended to slowly move the endodontic tip upward while injecting cement

True

T/F: It is recommended to quickly fill the canal in one motion by immersing the tip and injecting cement called “Immersion Filling”

False

What is the cementation procedure for seating the fiber post?

1. Seat, rotate and apply moderate pressure (ensure it is fully seated)

2. Remove excess after 3 minutes of self cure time with a microbrush

3. Buildup with composite resin

4. Prep tooth for all ceramic crown

What is custom cast post and core?

It is an indirect lab method for making a custom post and core

What are the post components that are involved with the indirect casting technique?

1. Impression post

2. Burnout post

3. Temporary post

Instead of placing a prefabricated post, you:

1. Take an impression of the canal

2. Lab fabricates a custom cast post and core

3. You cement the single metal unit

Why is it not essential that the reline material extend all the way down the post space?

By engaging the apical portion of the post space, the wire will enhance resistance of the interim restoration

The nail head of post should extend _____ outside the canal

2-3mm

You must modify the temporary post length at its apical end so that only 2-3mm of the retentive portion extends out of the canal orifice

Create a provisional using

ProTemp & putty

Why do we take an impression in Project #2?

To capture the shape and depth of the post space so the lab can fabricate a custom cast post and core

What type of impression is used?

PVS impression with an impression post and an anterior impression tray

What is the burnout post used for?

During casting and burns out during the lost wax casting process to create the metal post

Why would we choose a custom cast post instead of a fiber post?

• Very little coronal tooth structure

• Wide or irregular canal

• Need better adaptation to canal shape

What are disadvantages of cast posts?

• More appointments

• Requires lab