Prosthodontics & Occlusion · patient case question
What is the MAIN ADVANTAGE of an intracoronal attachment over a conventional clasp?
Patient case: Intracoronal attachment prosthesis in a patient on denosumab
Patient: Female, 72 years old
Chief complaint: “Something feels loose on this side and the tooth has changed colour.”
History: Osteoporosis treated with denosumab, six-monthly injections for the past four years. No other systemic disease.
Findings: Intracoronal (precision) attachment retaining a removable partial denture. The abutment tooth shows extensive vertical bone loss, greater than the radiograph shown suggests. The tooth does not respond to pulp testing.
Show answer and explanation
Correct answer: A. Improved aesthetics through elimination of the visible clasp arm
- A. CORRECT. The retentive mechanism is housed WITHIN the contour of the abutment crown, so there is no metal clasp arm crossing the visible facial surface. In the aesthetic zone this is decisive, and it is the reason attachments are chosen despite everything they cost. A secondary benefit is that the retentive force acts closer to the tooth's long axis, generating less torquing leverage than a clasp arm.
- B. Tooth preparation is GREATER, not less. The abutment must be crowned with enough reduction to house the matrix without leaving thin walls, and this is often the limiting factor in whether an attachment is feasible.
- C. Repair is HARDER. Attachments wear and lose retention over time, components are proprietary and may be discontinued, and replacement can mean remaking the crown.
- D. Attachments are substantially MORE expensive — in the components themselves, the crown work required, and the laboratory time.
Note: Practical prerequisites for an attachment: an abutment with adequate crown height and bulk, a healthy periodontium, and a patient with the dexterity to insert and remove the prosthesis and the means to maintain it. Fail any one and a well-designed clasp is the better prosthesis.
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