Internal volumetric expansion of casting investments

Marsaw, F.A.; Rijk, Waldemar G. de; Hesby, R.A.; Hinman, R.W.; Pelleu, George B.

doi:10.1016/0022-3913(84)90445-1

Cited by 19 publications

(5 citation statements)

References 3 publications

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“…Distortion of wax pattern like shrinkage due to relaxation of internal stresses contributes to detrimental effects on the final restoration. [21][22][23] Resins were recommended as pattern forming materials to overcome the shortcomings of wax. They offer strength, rigidity, and dimensional stability if immediate investment is not possible.…”

Section: Discussionmentioning

confidence: 99%

Effect of Different Pattern Construction Techniques on the Marginal Adaptation, Internal Fit and Fracture Resistance of Ips-Emax Press Crowns

Saleh

Amin

Abdellatif

2016

Egyptian Dental Journal

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purpose: The purpose of this study was to evaluate the effect of pattern construction technique on the marginal accuracy, internal fitness and fracture resistance of E-max crowns. materials and methods: Thirty caries-free human maxillary first premolars were selected, cleaned by scaling, and stored in 0.9% standardized saline solution at room temperature. Using an industrial lathe machine, the teeth were prepared to receive all ceramic crowns with standardized dimensions of 6 degrees angle of convergence. The preparation had 5mm occluso-cervical height, 6mm cervical diameter and 1 mm deep chamfer finish line. The prepared teeth were divided into three groups (n=10) according to the pattern fabrication techniques used: Group1: Conventional wax patterns. Group2: CAD/CAM wax patterns. Group3: 3D Printing of resin patterns. All patterns were invested to construct E-max crowns. The ceramic crowns were seated on their corresponding prepared teeth and the vertical marginal gap was measured with a binocular microscope (90X). Then internal gap of each ceramic crown was measured using the silicone replica technique. After cementation, each ceramic crown was statically, compressively and axially loaded until fracture at a cross head speed of 1 mm/min using a steel rod placed centrally at the occlusal surface of the crowns to evaluate the fracture resistance of the crowns. results: Group 1 showed the largest marginal gap mean (85.74±2.58μm) followed by group 2; (74.06±3.27µm) and then group3 (69.35± 3.44µm). These differences were statistically significant among the groups. The results of internal gap distances in group 1 (112±7.66µm) followed by group 2 (100±5.76µm) and then group3 (82± 7.2µm), the differences between the groups were statistically significant. The mean fracture resistance values of groups 1, 2 and 3 were 850.67±25.30N, 1080.01±47.06N and 1412.18±28.92N respectively. Post hoc test revealed that the differences between groups 1 and 2 as well as between groups 2 and 3 were statistically insignificant; however, the difference between groups 1 and 3 was statistically significant. Spearman's rank correlation coefficient showed value of-0.781. The negative sign indicates that the fracture resistance of the samples decreased as the internal gaps increased conclusions: The 3D printed pattern resulted in an E-max crown with better marginal adaptation and internal fitness. The fracture resistance of E-max crown was improved as its internal adaptation was enhanced.

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Section: Discussionmentioning

confidence: 99%

Effect of Different Pattern Construction Techniques on the Marginal Adaptation, Internal Fit and Fracture Resistance of Ips-Emax Press Crowns

Saleh

Amin

Abdellatif

2016

Egyptian Dental Journal

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“…Distortion of wax patterns has been reported for cast‐crown restorations cast into investment molds prepared from phosphate‐bonded investment materials 6 , 15–19 . The problem is generally related to the so‐called high hygroscopic setting expansion, which can be up to 5%, and commonly occurs with the use of wet liner or water bath 6,15 .…”

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confidence: 99%

Differing Expansion Contributions of Three Investment Materials Used for Casting Titanium

Low

2009

Journal of Prosthodontics

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The almost concurrent occurrence of high SE and high setting temperature generation in Rematitan Plus enlarged the wax pattern and effectively supplemented its low TE to produce oversized crowns. Despite this adverse effect, the correlation between TE and crown accuracy was still high. It is generally expected that the TE values given by manufacturers predict crown accuracy, when uniform TE, small SE, and minimum heat generation during setting are assured.

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“…In addition, the location measured was important with regard to magnitude. The 5 value on the surface of the mixed investment was measured by the F test (Marsaw et al, 1984), and the F value was measured from thermal change of the sample. The difference between the measured locations or the amounts might be important with respect to the magnitude (F and S).…”

Section: Discussionmentioning

confidence: 99%

“…The investments were evaluated by thermal analysis because the mixed investments exhibited an exotherm setting and expanded thermally during heating. The temperature increase during setting is observed when the investment powder is mixed using the recommended amount of water or liquid (Marsaw et al, 1984). The setting reaction of the mixed investmetit powder cati be measured by thermal analysis with a method similar to that using temperature changes of composite resins (Antonucci & Toth, 1983;Stevens, Okamoto & Jorgensen, 1985).…”

Section: Introductionmentioning

confidence: 99%

Thermal behavior of casting investment during setting

Wakasa

Yamaki

1995

J of Oral Rehabilitation

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The aim of this study was to examine the thermal reactions of silica-sol liquids for mixing investment powders using differential thermal analysis (DTA) and also the setting behaviour of the mixed powders using differential scanning calorimetry (DSC). The silica-sol liquids showed the appearance of vapourization (around 100 degrees C as a peak temperature) and combustion (200-300 degrees C) in DTA measurement. Mixed silica-sol investment exhibited the setting behaviour with an exotherm in the DSC measurement representing that greater peak time, setting time and heat in mixed investment than with gypsum-bonded investment.

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Internal volumetric expansion of casting investments

Cited by 19 publications

References 3 publications

Effect of Different Pattern Construction Techniques on the Marginal Adaptation, Internal Fit and Fracture Resistance of Ips-Emax Press Crowns

Effect of Different Pattern Construction Techniques on the Marginal Adaptation, Internal Fit and Fracture Resistance of Ips-Emax Press Crowns

Differing Expansion Contributions of Three Investment Materials Used for Casting Titanium

Thermal behavior of casting investment during setting

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