Factors affecting the accuracy of elastometric impression materials

Chen, S.Y.; Liang, Wen Miin; Chen, F.N.

doi:10.1016/j.jdent.2004.04.002

Cited by 121 publications

(126 citation statements)

References 13 publications

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“…Another study 11 found that Addition Reaction Silicone had greatest accuracy as well as good resistant to permanent deformation and considered the most dimensionally stable impression material when compare to Alginate which concur with the result of the present study. Regarding Surface Detail Reproduction Group-A representing 93.33% good surface details and 6.67% poor details where as Group-B representing 66.67% good surface details 33.33% poor details.…”

Section: Discussionsupporting

confidence: 92%

A Comparative Study on Accuracy and Reproducibility of Alginate and Addition Reaction Silicone as an Impression Materials.

Fatema

Quader²,

Shamsuzzaman³

et al. 2014

Update Dent. Coll. j

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Section: Discussionsupporting

confidence: 92%

A Comparative Study on Accuracy and Reproducibility of Alginate and Addition Reaction Silicone as an Impression Materials.

Fatema

Quader²,

Shamsuzzaman³

et al. 2014

Update Dent. Coll. j

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“…Alginate's instability through time and its surface roughness because of water loss are disadvantages, limiting its use only for diagnostic casts. 9 Nevertheless, alginate presented an acceptable accuracy in the present study, as long as the manufacturer's instructions for pouring time are followed.…”

Section: Discussionmentioning

confidence: 60%

“…9 After this, the software Image Tool (The University of Texas Health Science Center in San Antonio, TX, USA) was used to measure the distance between the teeth. Calibration was achieved based on the caliper's reference, and the distance between the edges of the tooth preparations was measured.…”

Section: Methodsmentioning

confidence: 99%

Accuracy of stone casts obtained by different impression materials

et al. 2008

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Several impression materials are available in the Brazilian marketplace to be used in oral rehabilitation. The aim of this study was to compare the accuracy of different impression materials used for fixed partial dentures following the manufacturers' instructions. A master model representing a partially edentulous mandibular right hemi-arch segment whose teeth were prepared to receive full crowns was used. Custom trays were prepared with auto-polymerizing acrylic resin and impressions were performed with a dental surveyor, standardizing the path of insertion and removal of the tray. Alginate and elastomeric materials were used and stone casts were obtained after the impressions. For the silicones, impression techniques were also compared. To determine the impression materials' accuracy, digital photographs of the master model and of the stone casts were taken and the discrepancies between them were measured. The data were subjected to analysis of variance and Duncan's complementary test. Polyether and addition silicone following the single-phase technique were statistically different from alginate, condensation silicone and addition silicone following the double-mix technique (p ≤ .05), presenting smaller discrepancies. However, condensation silicone was similar (p ≥ .05) to alginate and addition silicone following the double-mix technique, but different from polysulfide. The results led to the conclusion that different impression materials and techniques influenced the stone casts' accuracy in a way that polyether, polysulfide and addition silicone following the single-phase technique were more accurate than the other materials.Descriptors: Dental impression materials; Dental impression technique; Fixed partial denture.

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“…11 It is a good practice to separate the model and the cast before the hydrocolloid dehydrates because the dried alginate can cause abrasion of the cast during its removal. 13 Although no visible abrasion was verified in the casts in this survey, loss of richness in detail and reduced microhardness observed were probably due to alginate dehydration.…”

Section: Discussionmentioning

confidence: 58%

“…The literature confirms that alginate impression materials have less stability and accuracy when the storage time of alginate increase, [13][14][15] but the time of contact between alginate and gypsum has not been tested before. This study showed that the dimensional stability of the casts was not affected by increasing the time of contact between alginate and plaster.…”

Section: Discussionmentioning

confidence: 99%

Does the contact time of alginate with plaster cast influence its properties?

et al. 2012

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The aim of this study was to verify the influence of the time of contact between alginate and gypsum after the modeling procedure on the properties of the plaster cast, such as surface detail, dimensional stability and microhardness. Thirty cylindrical specimens of orthodontic gypsum Type III were made by means of impressions of a stainless steel master model which had five reference lines in the upper surface. The samples were divided into two groups: Group 1 (G1) -with time of contact of 1 hour; and Group 2 (G2) -12 hours of contact. All the specimens were stored up to 48 hours until they underwent laboratory testing. Surface detail and dimensional stability were tested by one calibrated examiner using a visual analysis and a profilometer (Profile Projector Nikon model 6C, Nikon Corporation, Tokyo, Japan), respectively, to evaluate the quality of reproduction of the lines and the distances between them. The microhardness was determined for each sample by making six indentations with a Vickers diamond pyramid indenter (Buehler, Lake Bluff, USA) under a load of 100 gF for 15 s. The results showed significant difference (P ≤ 0.05) between groups in two of the three properties examined: surface detail and microhardness, which decreased as the time of contact rose. The 12-hour time of contact between alginate and the plaster cast is not recommended because it influences the quality of the plaster cast.

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Factors affecting the accuracy of elastometric impression materials

Cited by 121 publications

References 13 publications

A Comparative Study on Accuracy and Reproducibility of Alginate and Addition Reaction Silicone as an Impression Materials.

A Comparative Study on Accuracy and Reproducibility of Alginate and Addition Reaction Silicone as an Impression Materials.

Accuracy of stone casts obtained by different impression materials

Does the contact time of alginate with plaster cast influence its properties?

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