Which clasp is commonly described as suitable for infrabulge principles and is shown as a T-bar design?

Which clasp is commonly described as suitable for infrabulge principles and is shown as a T-bar design?

• A. T-bar clasp
• B. I-bar clasp
• C. Wrought wire combination clasp
• D. RPI

Answer: (A)

Infrabulge retention relies on engaging tooth undercuts from below the height of contour, so the retentive element sits apical to the crown and works with the tooth’s contour rather than pressing on the gingiva. The design described as a T-bar provides a horizontal, T-shaped retentive arm that reaches into an undercut from beneath the height of contour, giving reliable retention while keeping most of the component below the gingival margin. This makes it a classic example of an infrabulge clasp. While other infrabulge designs (like the I-bar) exist and RPI systems use infrabulge principles, they do not present as a T-bar configuration. The wrought wire combination clasp is a different type of flexible clasp and not the T-bar infrabulge design.

Infrabulge retention relies on engaging tooth undercuts from below the height of contour, so the retentive element sits apical to the crown and works with the tooth’s contour rather than pressing on the gingiva. The design described as a T-bar provides a horizontal, T-shaped retentive arm that reaches into an undercut from beneath the height of contour, giving reliable retention while keeping most of the component below the gingival margin. This makes it a classic example of an infrabulge clasp. While other infrabulge designs (like the I-bar) exist and RPI systems use infrabulge principles, they do not present as a T-bar configuration. The wrought wire combination clasp is a different type of flexible clasp and not the T-bar infrabulge design.