Dimensional Stability and Accuracy of Silicone – Based Impression Materials Using Different Impression Techniques – A Literature Review

Naumovski, Borjan; Kapushevska, Biljana

doi:10.1515/prilozi-2017-0031

Cited by 24 publications

(19 citation statements)

References 27 publications

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“…According to ANSI/ADA Specification No. 19, fine details of the 20 μm line in the metal die must be reproduced in the elastomeric impression materials, and the linear dimensional changes should not exceed 1.5% [21,22]. In the current study, the mean dimensional changes were less than 0.5% in all experimental groups, with the highest shrinkage of 0.220% and expansion of -0.316%.…”

Section: Discussionmentioning

confidence: 58%

“…This study evaluated the dimensional stability of the PVS and VSE impression materials using a wellestablished method [4, 20 -22]. As suggested by ANSI/ADA Specification No.19 for elastomeric impression materials [21], a stainless-steel mold was used to produce disc-shaped impression samples in order to measure the dimensional changes. This method allows for the identical reproduction of test conditions so that other researchers can make comparisons with other materials by utilizing the same study conditions.…”

Section: Discussionmentioning

confidence: 99%

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Dimensional Stability of Elastomeric Impression Material After Disinfection Via Immersion and Microwave Irradiation

Mohd¹,

Omar²,

Etajuri³

2021

TODENTJ

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Aims: This study aimed to evaluate and compare the dimensional stability of two elastomeric impression materials, namely polyvinyl siloxane (PVS) and vinyl siloxanether (VSE), subjected to chemical immersion and microwave irradiation for disinfection. Materials and Methods: Sixty discs of PVS and VSE impression materials each were prepared using a stainless-steel test die and ring in accordance with ANSI/ADA Specification No. 19. Twenty discs of each impression material were disinfected by chemical immersion for 10 min; another 20 discs were subjected to dry microwave irradiation for 3 min. The other 20 discs served as a control group. Dimensional stability measurements were then performed using an image analyzer at 20× magnification. The data were analyzed by one-way analysis of variance (α=0.05) and Bonferroni (post hoc) test for multiple comparisons to detect significant differences between the groups. Results: When subjected to microwave irradiation, both PVS and VSE showed dimensional changes, but the changes were within the limit of 1.5% set by ANSI/ADA (P<0.00). VSE showed markedly better results than PVS for both disinfection methods. The immersion disinfection method resulted in a higher average percentage of linear dimensional changes than both the microwave irradiation and the control for VSE and PVS impression materials. Conclusion: VSE exhibited excellent dimensional stability than PVS under both chemical immersion and microwave irradiation. Microwave irradiation using conventional microwave ovens can be used in clinical settings as an alternative to other disinfection techniques because the dimensional changes of the elastomeric impression materials subjected to microwave irradiation have been observed to be within the clinically acceptable limit set by the ANSI/ADA standard.

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Section: Discussionmentioning

confidence: 58%

Section: Discussionmentioning

confidence: 99%

Dimensional Stability of Elastomeric Impression Material After Disinfection Via Immersion and Microwave Irradiation

Mohd¹,

Omar²,

Etajuri³

2021

TODENTJ

View full text Add to dashboard Cite

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“…Due to the dimensional instability of interocclusal registration materials, when adequate stable occlusal stops are present, the hand articulation of the casts has been shown to be a more accurate means of locating the proper interocclusal relationship [ 7 , 8 ]. The dimensional stability and accuracy of dental casts has been studied by multiple authors but can vary greatly depending on factors such as the impression and stone material used, impression technique, and storage time [ 9 , 10 ].…”

Section: Introductionmentioning

confidence: 99%

An In-Vitro Evaluation of Articulation Accuracy for Digitally Milled Models vs. Conventional Gypsum Casts

2022

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With the advent of a digital workflow in dentistry, the inter-occlusal articulation of digital models is now possible through various means. The Cadent iTero intraoral scanner uses a buccal scan in maximum intercuspation to record the maxillomandibular relationship. This in-vitro study compares the occlusion derived from conventionally articulated stone casts versus that of digitally articulated quadrant milled models. Thirty sets of stone casts poured from full arch polyvinyl siloxane impressions (Group A) and thirty sets of polyurethane quadrant models milled from digital impressions (Group B) were used for this study. The full arch stone casts were hand-articulated and mounted on semi-adjustable articulators, while the digitally derived models were pre-mounted from the milling center based on the data obtained from the buccal scanning procedure. A T-scan sensor was used to obtain a bite registration from each set of models in both groups. The T-scan data derived from groups A and B were compared to that from the master model to evaluate the reproducibility of the occlusion in the two groups. A statistically significant difference of the contact region surface area was found on #11 of the digitally articulated models compared to the master. An analysis of the force distribution also showed a tendency for a heavier distribution on the more anterior #11 tooth for the digitally articulated models. Within the limitations of this study, the use of a digitally articulated quadrant model system may result in a loss of accuracy, in terms of occlusion, the further anteriorly the tooth to be restored is located. Care must be taken to consider the sources of inaccuracies in the digital workflow to minimize them for a more efficient and effective restorative process.

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“…[3,4] Considering the importance of the dimensional stability of the impression material and that literature has not yet completely established the most accurate molding technique, clinical and laboratory studies comparing different impression materials and protocols are extremely relevant to assist the clinical decision of dentists. [3,5] Recommended by international guidelines such as ISO (International Organization for Standardization) 21563:2013 [6] and 4823:2015 [7], most of the studies evaluating the accuracy and/or dimensional stability of the impression materials use a measuring microscope [4,[8][9][10]. The main advantage of this method is the precision to measure the linear distance between two points in a specimen.…”

Section: Introductionmentioning

confidence: 99%

Dimensional change of impression materials for dental prothesis using different measuring methods

et al. 2021

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The aim of this study was to verify the effectiveness of alternative techniques for measuring the linear dimensional change of molds obtained by different impression materials. A stainless-steel die containing three lines was used to get the impressions. The impression materials were handled according to the manufacturers' instructions. After gelation/polymerization time, the molds (n=12) were stored for 30 minutes and the lines were subsequently measured using: a microscope (Olympus Measuring Microscope STM; Olympus Optical Co) with a 30x magnification (MM, control group), a digital caliper (Mitutoyo Digimatic; Kawasaki) (DC) and digitization using a digital camera (Canon EOS Rebel 3Ti; Canon) (DI). For each mold, a mean of the length of the lines was obtained. For each impression material, the difference in the length between the metallic matrix and the mold was considered as linear dimensional change (%). The data were submitted to the non-parametric Kolmogorov-Smirnov test, followed by one-way Analysis of Variance (ANOVA) for each material, and the means were compared by the Tukey test (α=0.05). The DI group promoted values of dimensional accuracy without significant differences with the control group (MM), except for the putty-body condensation silicone. The DC group showed significant differences for MM and DI groups for all impression materials tested. The DI group showed to be a reliable methodology (Standard error of the mean <10%) to measure the linear dimensional change of all impression materials. The DI group presented molds with linear dimensional change values without significant differences with MM group, except for the putty-body addition silicone. The digitization is a reliable methodology to evaluate the linear dimensional changes of molds made with impression materials, except for the putty-body elastomeric impression materials.

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Dimensional Stability and Accuracy of Silicone – Based Impression Materials Using Different Impression Techniques – A Literature Review

Cited by 24 publications

References 27 publications

Dimensional Stability of Elastomeric Impression Material After Disinfection Via Immersion and Microwave Irradiation

Dimensional Stability of Elastomeric Impression Material After Disinfection Via Immersion and Microwave Irradiation

An In-Vitro Evaluation of Articulation Accuracy for Digitally Milled Models vs. Conventional Gypsum Casts

Dimensional change of impression materials for dental prothesis using different measuring methods

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