Precision attachment-retained removable partial dentures: Part 2. Long-term study of ball attachments

Area of Science:

• Dental Prosthodontics
• Restorative Dentistry
• Biomaterials in Dentistry

Background:

• Removable partial dentures (RPDs) are common prosthetic solutions.
• Ball attachment retention systems offer an alternative for RPDs.
• Long-term clinical outcomes of ball attachment-retained RPDs are not extensively documented.

Purpose of the Study:

• To evaluate the long-term clinical performance and survival of ball attachment-retained removable partial dentures.
• To assess the technical complications associated with this prosthetic design over an extended follow-up period.

Main Methods:

• A retrospective study followed 24 patients with ball attachment-retained RPDs for up to 23.5 years.
• Prosthetic treatment involved combinations of fixed partial dentures (FPDs) and RPDs, with nonresilient hinged couplings.
• All ball attachment matrices featured vertical occlusal stops; 66 abutments for FPDs were assessed, including 30 root canal-treated teeth with posts.

Main Results:

• No technical failures (e.g., loss of retention, fracture) were recorded for the fixed partial dentures.
• Removable partial dentures required modifications: 2 received additional clasps, 2 were remade due to fractures, and 4 were relined.
• The prosthetic treatment was successful even in arches with limited remaining teeth (2-3 teeth in 17 arches).

Conclusions:

• Ball attachment-retained removable partial dentures, when integrated with fixed partial dentures, exhibit excellent long-term durability and minimal technical failures.
• This prosthetic approach provides a reliable and stable treatment option, even for patients with severely compromised dentition.
• Further research could explore patient-reported outcomes and cost-effectiveness.