Biomedical subjects

R G Koeppen

Publications and source records attributed to R G Koeppen.

5 recordsLinked to original sources

PubMed2001

A nontraditional technique for obtaining optimal esthetics for an immediate denture: a clinical report.

Bimaxillary protrusion and severe labioversion of anterior teeth complicate impression procedures and increase the difficulty in making esthetic predictions for the immediate complete denture patient. The presented technique, performed in reverse order of traditional methods, is accomplished in stages in which the anterior and nonessential posterior teeth are extracted and interim removable partial dentures placed. An opportunity is thus created to evaluate esthetics, phonetics, and anterior tooth function before extraction of the remaining dentition and delivery of immediate complete dentures. This technique facilitated the determination of the need for alveoplasty of the anterior maxilla.

Alveoloplasty↗

PubMed1993

A new method of attaching cast gold occlusal surfaces to acrylic resin denture teeth.

Historically, cast gold occlusal surfaces for complete or removable partial dentures have been fabricated with retentive loops or beads and luted to prepared denture teeth with acrylic resin or attached to tooth-colored, heat-processed acrylic resin. At present, alternatives to mechanical retention for attaching resin to metal include chemical bonding of the resin after placement of intermediate ceramic or tin layers and the use of chemically adhesive resin cements. Compared to mechanical retention, the chemical bonding of resin to metal requires less gold and allows more room for properly contoured and esthetic resin. Additionally, this chemical bond limits microleakage at the resin-metal interface. In the following technique, cast gold occlusal surfaces are fitted to onlay preparations of acrylic resin denture teeth set in a processed denture base. The castings are air-abraded, tin plated, and luted to the denture teeth with Panavia dental adhesive. This method is quick, easy, and economical.

Acrylic Resins↗

PubMed1992

Bar attachments for overdentures with nonparallel abutments.

Bar attachments are easily fabricated and provide increased retention and support for overdentures. Nonparallel root abutments can preclude the routine use of bar attachments unless modifications are made in the design. This article reviews several existing techniques to successfully fabricate bar attachments in overdenture patients with nonparallel abutments. In addition, three alternative methods are presented for placing bar attachments on abutments with divergent roots.

Dental Abutments↗

PubMedDate not supplied

Immersion disinfection of irreversible hydrocolloid impressions with sodium hypochlorite. Part II: Effect on gypsum.

This study investigated the effects of various immersion times and concentrations of sodium hypochlorite on irreversible hydrocolloid impressions and resultant gypsum casts. Irreversible hydrocolloid impressions of a test die were immersed for 1, 5, or 10 minutes in water (control), 5.25%, 0.525%, and 0.0525% sodium hypochlorite and then cast in a Type III stone and a Type V stone. Each stone specimen was evaluated for detail reproduction, dimensional change, surface roughness, and surface hardness. The results indicated that impressions may be immersed in sodium hypochlorite for any of the experimental times and concentrations without negative effects on Type V stone casts. However, immersion of impressions in 5.25% sodium hypochlorite causes some surface deterioration on Type III stone casts.

Alginates↗

PubMedDate not supplied

Microleakage associated with resin composite-cemented, cast glass ceramic restoration.

Resin cements are the preferred luting media for ceramic restorations, but manufacturers have traditionally made no recommendations concerning the use of dentin bonding agents in the luting process. This in vitro study evaluated the microleakage associated with several luting agents for ceramic inlays. One hundred twenty Class V inlays (occlusal margins in enamel and gingival margins in dentin) were luted in extracted teeth using zinc phosphate cement, two resin cements without a bonding agent, and two resin cements with three dentin bonding agents. This study suggests that the use of a dentin bonding agent with a resin cement will reduce microleakage in cast glass-ceramic restorations.

Acrylic Resins↗