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The Begg retainers have the labial bow extending around the distal aspect of the terminal molar. [10] They allow occlusal settling, as no wire work crosses the occlusion. Begg retainers are robust enough to be worn during eating, [11] however they are more retentive than Hawley retainers and the labial bow is less prone to distortion. [12]
Fixed prosthodontics is the branch of prosthodontics that focuses on dental prostheses that are permanently affixed (fixed). Crowns, bridges (fixed dentures), inlays, onlays, and veneers are some examples of indirect dental restorations.
The wing or retainer must be rigid and is usually fabricated from a metal alloy. The inner surface must fit closely to the abutment tooth. The intaglio is treated in some way to enhance the micromechanical adhesion between the prosthesis and the composite resin cement. In the past various methods have been used, ranging from metal-weave ...
When a removable denture is worn, retainers to hold the denture in place can be either custom made or "off-the-shelf" (stock) abutments. When custom retainers are used, four or more implant fixtures are placed and an impression of the implants is taken and a dental lab creates a custom metal bar with attachments to hold the denture in place.
The material is also more technique-forgiving compared to composite restorations used for that purpose. Dental amalgam is also radiopaque which is beneficial for differentiating the material between tooth tissues on radiographs for diagnosing secondary caries. The cost of the restoration is typically cheaper than composite restorations.
Restoration replacement: Restorations in abutment teeth with questionable prognosis or old composite resin restorations for adhesive bridgework should be replaced. [ 4 ] Tooth preparation : This should be completed with reference to radiographs and study casts obtained during treatment planning.