25 Questions
What is the color code for Regular Coping?
Purple
What is the Narrow Coping size determined by?
Yellow code
How many color codes are mentioned for snap on caps?
2
What size is determined by the Purple code?
Regular Coping
What is the meaning of the Yellow code?
Narrow Coping
What is a characteristic of a hybrid abutment?
It consists of two separate pieces
What is the main difference between a lithium disilicate abutment and a zirconia abutment?
The ceramic material used
What is the purpose of resin cement in a hybrid abutment?
To bond the ceramic to the titanium base
What is milled from ceramic blocks in a hybrid abutment?
The ceramic portion
What is the base material used in a hybrid abutment?
Titanium
What is the state of the tissue contours at this point?
They are frozen
What is a characteristic of polyvinyl siloxane (PVS) that enables it to achieve the best detail reproduction in a moist environment?
Hydrophilic nature
What is the purpose of Floss Scaffold or Matrix?
To hold the resin in place
What is the result of the process at this point?
A completed resin splint
Which property of PVS is responsible for securing the implant coping position?
Rigidity
What is the significance of the resin splint being completed?
It is now ready for use
What is the advantage of the high flow properties of PVS?
It enables intimate contact with transfer coping
What is the relationship between the resin splint and the Floss Scaffold or Matrix?
The Floss Scaffold or Matrix is used to create the resin splint
What is a benefit of using PVS in a moist environment?
It improves the accuracy of the impression
What is a characteristic of PVS that is important for its use in implant impressions?
Its hydrophilic nature
What is the primary benefit of using an impression coping?
To create a precise replica of the implant angulation
What is a disadvantage of using an impression coping?
Rotation of the coping during analogue
What is the consequence of breaking the stone cast?
Loss of the soft tissue reference point
What is the primary function of the impression coping?
To create a precise replica of the implant angulation
What is the significance of the soft tissue reference point?
It ensures accurate replication of implant angulations
Study Notes
Polyvinyl Siloxane (PVS) Addition Silicone
- Hydrophilic property allows for best detail reproduction in a moist environment.
- High flow properties enable intimate contact with transfer coping.
- Rigidity secures implant coping position, allowing tissue contours to be "frozen".
Hybrid Abutments
- Lithium disilicate seated on a Ti base (hybrid) is one type of hybrid abutment.
- Zirconia seated on a Ti base (hybrid) is another type, milled from E.max or zirconia blocks and bonded to a titanium base by a resin cement in the laboratory.
- Hybrid abutments have a snap-on cap available in different colors, each determining a different size (e.g., yellow code for Narrow Coping, purple code for Regular Coping).
Advantages and Disadvantages
- Accurate replication of implant angulations is an advantage of hybrid abutments.
- Rotation of coping during analogue is a disadvantage of hybrid abutments.
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