The Influence of Tray Space and Repeat Pours on the Accuracy of Monophasic Polyvinylsiloxane Impression

Rajapur, Anand; Dixit, Santosh; Hoshing, Chetan; Raikar, Sonal

doi:10.5005/jp-journals-10024-1236

Cited by 9 publications

(5 citation statements)

References 17 publications

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“…Sayed et al (2015) reported that abutment height increase occurred because impression material trapped in impression tray and could not come out and increase the abutment height. 1,13,15 the decrease of abutment height occurred at all Group D samples, possibly caused by uneven wash bulk in impression. This findings similar to previous study done by Dugal et al (2013) and Chugh et al (2012) who stated that two step impression technique using polyethylene spacer (0,5 mm) will decrease in abutment height because of the spacer was folded when the impression was taken especially at the top of abutment so that the wash bulk is uneven.…”

Section: Discussionmentioning

confidence: 84%

“…Elastic recovery is the nature of polyvinyl siloxane to return to its original shape after stretching so that the material can be larger or smaller. 13 Caputi and Varvara (2008) stated that putty elastic recovery occurred when the impression was taken out, it would pulled wash material which can lead to increase the inter-abutment distances. 14 Meanwhile, Mahdi (2016) stated that two step putty-wash impression technique had elastic recovery from putty material when it was reseated on master model at the second step of impression, which caused pressure on putty lead on dimensional change of putty.…”

Section: Discussionmentioning

confidence: 99%

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Dimensional Accuracy of Putty-Wash One-Step and Two-Step Impression Technique in Fabrication of Fixed Partial Denture

Fernando¹,

Syafrinani²,

Nasution³

2019

jemds

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BACKGROUND Impression is crucial step in fabrication of fixed partial denture (FPD). The most common impression technique used in fabrication of fixed partial denture (FPD) is putty-wash impression technique, divided into two, which are one step and two step. Dimensional accuracy of one step and two step putty-wash impression technique is still a controversial. The purpose of this study is to find out the impression results difference of dimensional accuracy, inter abutment distance, abutment height, and mesiodistal width among conventional one step technique, modified one step technique with ethyl vinyl acetate spacer, non-spacer two step technique and two step technique with polyethylene spacer. METHODS The design of this study is laboratory experimental. Samples of this study are dye model from master model imprinted with polyvinyl siloxane putty and wash poured with type IV gypsum. The size of the master model is 28,25 mm for inter abutment distance, 8 mm for abutment height and 6,25 mm for mesiodistal width. 40 samples are divided into four groups, which are conventional one step technique group, modified one step technique with ethyl vinyl acetate spacer group, non-spacer two step technique group and two step technique with polyethylene spacer group. The samples are fabricated at Unit Jasa Industri (UJI) Dental FKG USU, the samples are scanned at Laboratorium Simon Dental Medan and measured with 3D Builder software. The samples are measured according to ISO No. 4823 in three dimension which are inter-abutment distance, abutment height and abutment mesiodistal width. RESULTS Mean and standard deviation for group A is-0,216±0,127%, group B is 0,177 ± 0,11 %, group C is 0,57 ± 0,213 %, and group D is-0,375 ± 0,141%. The mean and standard deviation abutment height for group A is 0,575 ± 0,271%, group B is 0,013±0,26%, group C is 0,55±0,179% and group D is-0,85 ± 0,444%. The mean and standard deviation mesiodistal width for group A is-1,54±0,28%, group B is 0,08±0,173%, group C is-1,168 ± 0,534 % and group D is-0,72 ± 0,513 %. CONCLUSIONS Modified one step technique with ethyl vinyl acetate spacer is the most accurate technique in inter-abutment distance, abutment height and mesiodistal width and the accuracy of that technique had significant difference with other techniques. HOW TO CITE THIS ARTICLE: Fernando, Syafrinani, Nasution I. Dimensional accuracy of putty-wash one-step and two-step impression technique in fabrication of fixed partial denture.

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Section: Discussionmentioning

confidence: 84%

Section: Discussionmentioning

confidence: 99%

Dimensional Accuracy of Putty-Wash One-Step and Two-Step Impression Technique in Fabrication of Fixed Partial Denture

Fernando¹,

Syafrinani²,

Nasution³

2019

jemds

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“…Although custom trays allow the obtaining of outstanding accuracy in impressions procedures, the use of metal stock trays is popular and well accepted in general practice. Other studies 24,25 showed no significant effect regarding the influence of tray material on the dimensional stability of impressions and poured casts. Despite this, the use of custom trays might be more predictable and economical because less material is necessary for the impression procedures 25 .…”

Section: Discussionmentioning

confidence: 84%

Effect of techniques, trays and materials on accuracy of impressions clinically made

Messias

Silva

Abi‐Rached

et al. 2019

Rev. odontol. UNESP

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Introduction Making accurate and dimensionally stable impressions to duplicate oral conditions and tooth morphology is an essential step of prosthetic dentistry for fabricating well-fitted indirect restorations and, consequently, ensure the longevity and success of the treatment. Several authors describe pros and cons of different impression techniques, although there is no unanimity among them about the best one. Objective This study evaluated casts’ accuracy made by different impression techniques, trays and materials. Material and method 10 patients were selected and 20 impressions from teeth #13 to #16 were performed using single-step (SS) and two-step techniques, made with metal stock and customized acrylic resin partial trays, vinyl polysiloxane and condensation silicone rubbers. Type IV gypsum was used to pour the casts. Three photographs of each patient (baseline), as their respective gypsum casts, were taken, measured in their interested buccal surface area. Comparisons of area values among experimental groups and baseline were performed. Data showed adherence to normal curve, being submitted to 3-way ANOVA/Bonferroni test (α=.05). Result Technique produced significant differences (P=0.02). SS technique was more accurate than BUR one (P=0.003; 95=1.22 to 5.98), but both resulted in similar casts to PVC, MOV and NR techniques, which were similar to each other (P>0.05). Conclusion SS technique showed the closest absolute values to baseline.

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“…There were no significant differences in the dimensions of the stone models poured at different times, which is due to using additional silicone impression material. [24][25][26] However, when a 2-mm spacer was used for trays, the casts poured after the first hour exhibited higher dimensional similarity with the original model with a minimal difference in their means.…”

Section: Discussionmentioning

confidence: 99%

Effect of multiple pouring on the accuracy of casts made using 3D-printed custom trays with different spacer thicknesses: A research study

Tavakolizadeh

Razaghi

Pakravan

et al. 2020

J Dent Res Dent Clin Dent Prospects

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Background . This study aimed to evaluate the effect of different pouring times and spacer thicknesses on the three-dimensional accuracy of casts made of 3D-printed custom trays. Methods. A partial edentulous maxillary model was scanned for fabricating custom acrylic trays. Twenty custom trays were created using a CAD/CAM system and divided into two groups in terms of their spacer thicknesses (2 mm and 4 mm). All the trays were designed with 2-mm thickness, multiple retentive holes measuring 2 mm in diameter, and three interior seating stops (two on the edentulous ridge and one on the incisal edge of the central incisors). Impressions were made using monophasic polyvinyl siloxane and poured in two different times (one hour and 24 hours after removal) with type IV dental stone. All the casts were scanned to measure three distances (inter-buccal cusps, inter-palatal cusps, and inter-fossa distances) between the two first premolars. The data were analyzed with two-way ANOVA and Bonferroni test at a significance level of 0.05. Results. There was no significant difference between the 3D accuracy of casts made using two different spacer thicknesses poured at 1-hour and 24-hour intervals. However, there was a difference between casts made after 1 hour and 24 hours when using custom trays with 2 mm of spacer thickness in terms of inter-buccal distance. Conclusion. There was no significant difference between the accuracy of casts made using custom trays with either 2 or 4 mm of spacer thickness, which were poured 1 hour or 24 hours after tray removal.

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The Influence of Tray Space and Repeat Pours on the Accuracy of Monophasic Polyvinylsiloxane Impression

Cited by 9 publications

References 17 publications

Dimensional Accuracy of Putty-Wash One-Step and Two-Step Impression Technique in Fabrication of Fixed Partial Denture

Dimensional Accuracy of Putty-Wash One-Step and Two-Step Impression Technique in Fabrication of Fixed Partial Denture

Effect of techniques, trays and materials on accuracy of impressions clinically made

Effect of multiple pouring on the accuracy of casts made using 3D-printed custom trays with different spacer thicknesses: A research study

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