Construction and assembly of porcelain veneer gold crowns and pontics

Johnston, John F.; Dykema, Roland W.; Mumford, George; Phillips, Ralph W.

doi:10.1016/0022-3913(62)90166-x

Cited by 11 publications

(7 citation statements)

References 4 publications

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“…Prior to 1970, some of the luminaries in the art and science of soldering were Coleman, 5 Taylor and Teamer, 25 Steinman, 16 Ryge, 1 Smyd, 39 Hollenback and Shell, 40,41 and Johnston et al 42 Coleman 5 classified dental gold casting alloys and solders on the basis of their composition and melting characteristics. Taylor and Teamer 25 studied the desirable properties of dental gold solders (melting temperatures and flow characteristics) in relation to their basic Au–Cu–Ag content, and suggested a fineness range of 0.435 to 0.800.…”

Section: Pioneering Researchmentioning

confidence: 99%

“…Smyd 39 discussed the various expansion and contraction factors involved in soldering, with emphasis on soldering investment. Johnston et al 42 reported postsoldering as many as ten metal ceramic units at one time in a porcelain furnace “without any clinical evidence of warpage.” These authors set the stage for more recent work in the field.…”

Section: Pioneering Researchmentioning

confidence: 99%

“…Several authors 41–43,49 have recommended plaster or stone indices for investment soldering. Others 1,16 have used sticky wax, and Patterson 57 described the method for using autopolymerizing acrylic resin.…”

Section: Evaluation Of Soldering Accuracymentioning

confidence: 99%

“…It was emphasized that efficient heating and rapid soldering minimized porosity and distortion, whereas repeated heating led to greater distortion. Similarly, preheating regimes have been recommended by others to promote even heating of the invested assembly, allowing more rapid and efficient flame soldering, presumably to minimize porosity and distortion; Johnston et al 42 recommended 900 to 1000°F, Jelenko 4 recommended 1200°F, and Meyer 53 recommended preheating to1500°F and then using a vertical flame angle. The Jelenko manual 4 claimed that preheating in a furnace at 750°F to 900°F effectively eliminated distortion of the investment block caused by preheating with a Bunsen burner.…”

Section: Evaluation Of Soldering Accuracymentioning

confidence: 99%

“…Variation was attributed to uneven heating of the soldering block and metal. An investment block thickness of 0.5 inch was recommended by Johnston et al 42 …”

Section: Evaluation Of Soldering Accuracymentioning

confidence: 99%

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Soldering in Prosthodontics-An Overview, Part I

Byrne¹

2011

Journal of Prosthodontics

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The fit of fixed multiunit dental prostheses (FDP), traditionally termed fixed partial dentures (FPDs), is an ongoing problem. Poorly fitting restorations may hasten mechanical failure, due to abutment caries or screw failure. Soldering and welding play an important role in trying to overcome misfit of fixed multiunit prostheses. The term FPD will be used to denote multiunit fixed dental prostheses in this review. This is the first of a series of articles that review the state of the art and science of soldering and welding in relation to the fit of cemented or screw-retained multiunit prostheses. A comprehensive archive of background information and scientific findings is presented. Texts in dental materials and prosthodontics were reviewed. Scientific data were drawn from the numerous laboratory studies up to and including 2009. The background, theory, terminology, and working principles, along with the applied research, are presented. This first article focuses on soldering principles and dimensional accuracy in soldering. There is some discussion and suggestions for future research and development. Soldering may improve dimensional accuracy or reduce the distortion of multiunit fixed prostheses. Many variables can affect the outcome in soldering technique. Research science has developed some helpful guidelines. Research projects are disconnected and limited in scope.

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Section: Pioneering Researchmentioning

confidence: 99%

Section: Pioneering Researchmentioning

confidence: 99%

Section: Evaluation Of Soldering Accuracymentioning

confidence: 99%

Section: Evaluation Of Soldering Accuracymentioning

confidence: 99%

“…Variation was attributed to uneven heating of the soldering block and metal. An investment block thickness of 0.5 inch was recommended by Johnston et al 42 …”

Section: Evaluation Of Soldering Accuracymentioning

confidence: 99%

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