An investigation of epoxy resin dies

Nomura, Gerald T.; Reisbick, M.H.; Preston, Jack D.

doi:10.1016/0022-3913(80)90045-1

Cited by 22 publications

(10 citation statements)

References 4 publications

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“…Epoxy resin dies have been found to be generally undersized primarily because of polymerization shrinkage [15]. Vermilyea et al [16] investigated three resin-based die materials that demonstrated hardness and tensile strength superior to gypsum.…”

Section: Discussionmentioning

confidence: 99%

Effect of Stone Enhancer on Marginal Fit of Nickel Chromium Cast Copings

Thotapalli¹

2013

Anaplastology

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crown with a 6° taper and a straight shoulder finish line [5]. The ivorine tooth form was fixed in the base that is provided by the manufacturer during preparation. This prepared tooth form was then duplicated using a technique described by Mekayarajjananonth and Huband [6]. A small self cure acrylic container was cut into two parts. The upper portion containing the lid was used for the duplication procedure. This was about 2 cm high. The prepared typhodont tooth form was placed in the center of the lid and stabilized using sticky wax. Light body poly

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Section: Discussionmentioning

confidence: 99%

Effect of Stone Enhancer on Marginal Fit of Nickel Chromium Cast Copings

Thotapalli¹

2013

Anaplastology

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“…It may be indicated, because of variances in impression techniques [ 11 , impression materials [2][3][4], model materials [5,6], investments [7], and castings [8,9], not to mention minor physiologic tooth movements [lo], to make multiple castings, and then solder them to form a fixed bridge prosthesis. The high cost of gold and other precious alloys, as well as the excessive thickness needed to maintain rigidity under porcelain, has caused many dentists to turn to the utilization of non-precious alloys.…”

Section: Introductionmentioning

confidence: 99%

Laser‐welded vs soldered nonprecious alloy dental bridges: A comparative study

Apotheker¹,

Nishimura

Seerattan³

1984

Lasers Surg Med

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The high cost of gold alloy has caused the dental profession to begin substituting nonprecious alloy for the framework in porcelain fused to metal bridges. Especially in long-span bridges it may be advantageous to make multiple castings and then join them for a better fit. As opposed to the highly successful soldering of gold, soldered nonprecious alloy bridges have a great failure rate in the mouth. Removal of and remaking of the bridges is thus the result. This study compares nonprecious units that have been laser-welded with those conventionally soldered. Seven identical bridges of three units were cast in a popular alloy composed of 74-78% nickel, 12-15% chromium, 4-6% molybdenum, and 1.8% maximum beryllium. One served as a control, while the remaining six were all cut in the same place. Of these, three were soldered with a gas oxygen torch. The other three were welded with a Nd-YAG laser. Better and stronger joints unlikely to fracture in the mouth were found with the laser-welded specimen.

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“…On the master cast all technical steps leading to completed restoration must be performed 6 . The ability of the resin material to replicate details has already been proved in many articles 10–13 , 16,17 . The capacity of the resin material to correctly reproduce distances is very important when, for example, a passively fitting implant structure has to be realized 22,23 …”

mentioning

confidence: 98%

“…Nomura et al evaluated three epoxy resin materials for detail reproduction, hardness, and accuracy of fit with respect to a cast restoration. The resins demonstrated that, though their detail reproduction was comparable to die stone, the hardness of the materials tested was less than that of die stone, and with respect to a completed crown, the resin dies were undersized 16 . Aiach et al investigated the relationship between epoxy resins and different impression materials; they reported that some die shrinkage occurred.…”

mentioning

confidence: 99%

“…The resins demonstrated that, though their detail reproduction was comparable to die stone, the hardness of the materials tested was less than that of die stone, and with respect to a completed crown, the resin dies were undersized. 16 Aiach et al investigated the relationship between epoxy resins and different impression materials; they reported that some die shrinkage occurred. An excellent detail reproduction was seen combining epoxy resins to addition silicone and polyether.…”

mentioning

confidence: 99%

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