74. Repairs and relines of removable partial dentures.
Covers how removable partial dentures are repaired and relined when they break, lose a tooth or clasp, or stop fitting as the ridge shrinks. It sets out a table of common problems with their repairs, then walks through repairing a fractured resin base step by step, including making an index, beveling the joint and curing. It finishes with the replacing of teeth, and a comparison table of reline, rebase and tissue conditioner.
Topic 74 of 75 in the MU Sofia syllabus for Preclinics of Dental Prosthetics (Dental Medicine, Year 2). The free AceMed note covers it in 5 sections, about 265 words (3 min of reading), with 14 flashcards.
In this note
Introduction
Common repairs
Repairing a fractured base
Replacing a tooth
Reline and rebase
Introduction
Removable dentures break, lose teeth or clasps, and stop fitting as the ridges shrink. Most of these problems can be fixed with a repair, an addition, a reline or a rebase, without making a new denture. Resin bases make this easy; cast frameworks are repaired by soldering or laser welding.
Repairing a fractured base
Fit the pieces together and check the fit; join them with sticky wax along the fracture.
Pour plaster or stone into the fitting surface to make an index that holds the pieces in place.
Separate, then grind away 2–3 mm on each side of the fracture and bevel the edges to give fresh resin and more bonding surface; add retention if needed.
Coat the index with separating agent; reseat the pieces; moisten the surfaces with monomer.
Add repair resin (self-cure PMMA, or light-cure composite such as a pink VLC material with bonding agent).
Cure (pressure pot with warm water for self-cure resin), then trim, smooth with acrylic burs and polish with pumice.
A well-done repair is hard to see. Repeated fractures point to a cause: a poor fit, an unbalanced occlusion, a notch at the frenum or a thin base; correct it, or the denture will break again.
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