scholarly journals Effect of Mixing and Impression Techniques Using Vinyl Polysiloxane (VPS) on the Accuracy of Fixed Partial Dentures

2021 ◽  
Vol 11 (17) ◽  
pp. 7845
Author(s):  
Helena Zelikman ◽  
Ofir Rosner ◽  
Sarit Naishlos ◽  
Hanaa Azem ◽  
Isabelle Meinster ◽  
...  
Keyword(s):  
Mechanical Mixing ◽  
Two Stage ◽  
Partial Denture ◽  
Significant Statistical Difference ◽  
Fixed Partial Denture ◽  
Impression Technique ◽  
Impression Materials ◽  
Metal Framework ◽  
The One ◽  
Mixing Techniques

Two critical factors that influence the accuracy of an impression include the proper manipulation of the impression materials and the technique used to make the impression. The purpose of this study was to clinically evaluate the effect of different mixing techniques on the accuracy of vinyl polysiloxane (VPS) impressions by assessing metal framework fit of fixed partial restorations. The study included 92 consecutive patients diagnosed with partial edentulism and treated with fixed partial denture restorations. The mixing technique was one of the two following mixing methods: hand mixing technique (45 patients), with the putty material mixed according to the manufacturer’s instructions; or mechanical mixing technique (47 patients), with the putty material mixed by a Pentamix device. Under both mixing methods, vinyl polysiloxane was used as the impression material. Two impression techniques were randomly used by the operators (One/Two-stage putty –wash impression techniques). The accuracy of the metal framework restorations was tested clinically and radiologically, resulting in significant statistical difference (p = 0.04) between different mixing techniques. The mechanical mixing produced more accurate restorations (metal framework misfit only in 14.9% of patients vs. hand mixing 31.1%). Regarding the impression techniques, the two-stage impression technique was found to be significantly more accurate (p = 0.04), resulting in 14.6% ill-fitted metal frameworks vs. 31.8%, in the one-stage technique. It can be concluded that mechanical mixing yields more accurate impressions leading to more accurate restorations, especially when combined with two-stage impression technique.

scholarly journals Influence of Vinyl Polysiloxane Impression Techniques on Marginal Fit of Metal Frameworks for Fixed Partial Dentures

Materials ◽  
2020 ◽  
Vol 13 (20) ◽  
pp. 4684
Author(s):  
Joseph Nissan ◽  
Ofir Rosner ◽  
Gal Rosen ◽  
Sarit Naishlos ◽  
Eran Zenziper ◽  
...  
Keyword(s):  
Accuracy Assessment ◽  
Partial Denture ◽  
Factors Affecting ◽  
Fixed Partial Denture ◽  
Impression Technique ◽  
Metal Framework ◽  
Group 2 ◽  
Test Failure ◽  
Group 1

Impression technique is one of the factors affecting restoration fit accuracy, which is a major aspect influencing its survival. The purpose of this study is to compare, in vivo, the effect of two commonly used Vinyl Polysiloxane (VPS) impression techniques on the metal framework fitting of fixed partial dentures. Ninety-two consecutive patients, diagnosed as partially edentulous, treated by fixed partial denture restorations, participated in the study. Group 1-impressions (n = 44) were subjected to the 1-step technique, while group 2 impressions (n = 48) were subjected the 2-step technique. Three accuracy assessment common methods: probe, tactile sense and radiographic test, were used to validate the clinical fit of the metal framework. Misfit was defined as even one test failure. Twenty-one (22.8%) out of 92 metal frameworks exhibited metal frameworks misfit, whereas the other 71 (77.2%) were found to be accurate. Group 1 presented significantly (p = 0.04) more metal frameworks misfit, 14/44 (31.8%) vs. 7/48 (14.6%). Restoration location (maxilla vs. mandible) had no statistically significant impact on the results (p = 0.461). The use of the VPS putty/wash 2-step impression technique is recommended to improve the clinical fit of fixed partial denture restorations.

scholarly journals Accuracy of the One-Stage and Two-Stage Impression Techniques: A Comparative Analysis

2016 ◽  
Vol 2016 ◽  
pp. 1-5 ◽  
Author(s):  
Ladan Jamshidy ◽  
Hamid Reza Mozaffari ◽  
Payam Faraji ◽  
Roohollah Sharifi
Keyword(s):  
Standard Method ◽  
Mean Value ◽  
Marginal Gap ◽  
Two Stage ◽  
Finish Line ◽  
One Stage ◽  
Impression Technique ◽  
Significant Difference ◽  
The Mean ◽  
The One

Introduction. One of the main steps of impression is the selection and preparation of an appropriate tray. Hence, the present study aimed to analyze and compare the accuracy of one- and two-stage impression techniques. Materials and Methods. A resin laboratory-made model, as the first molar, was prepared by standard method for full crowns with processed preparation finish line of 1 mm depth and convergence angle of 3-4°. Impression was made 20 times with one-stage technique and 20 times with two-stage technique using an appropriate tray. To measure the marginal gap, the distance between the restoration margin and preparation finish line of plaster dies was vertically determined in mid mesial, distal, buccal, and lingual (MDBL) regions by a stereomicroscope using a standard method. Results. The results of independent test showed that the mean value of the marginal gap obtained by one-stage impression technique was higher than that of two-stage impression technique. Further, there was no significant difference between one- and two-stage impression techniques in mid buccal region, but a significant difference was reported between the two impression techniques in MDL regions and in general. Conclusion. The findings of the present study indicated higher accuracy for two-stage impression technique than for the one-stage impression technique.

An Evaluation of the Fit of Metal-Ceramic Restorations Made with an Autoclaved Silicone-Based Impression Material

2010 ◽  
Vol 11 (4) ◽  
pp. 63-70 ◽  
Author(s):  
Ralf Kollefrath ◽  
Marcel Savary ◽  
Jörg Schwela
Keyword(s):  
Cross Contamination ◽  
Steam Sterilization ◽  
Partial Denture ◽  
Impression Material ◽  
Fixed Partial Denture ◽  
Impression Materials ◽  
First Impression ◽  
Metal Ceramic ◽  
Ceramic Restorations ◽  
Ceramic Crown

Abstract Aim To demonstrate the clinical feasibility of autoclaving certain silicone impression materials in order to avoid potential cross-contamination during handling, transport, and subsequent processing. Background Semicritical devices are recommended to be treated at least with high-level disinfectants or actually steam sterilized at 134°C. To date dental impressions have been disinfected rather than sterilized, so the question remains should they be sterilized before being sent to the dental laboratory? Case Descriptions Two identical impressions per case were made of metal-ceramic crown and fixed partial denture preparations on the same patient using addition type polyvinyl siloxane (PVS) impression materials (AFFINIS, R Coltene/ Whaledent AG, 9450 Altstatten, Switzerland) in different trays. The first impression (IMPx1) was cleaned and treated with an intermediate-level disinfectant (FD 322.Fast Disinfection Spray, Durr Dental, 74321 Bietigheim-Bissingen, Germany). The second impression (IMPx2) was cleaned, treated with an intermediate-level disinfectant as with IMPx1, subjected to a computer tomography (CT) scan with a dimensional resolution of ±10 μm, steam sterilized, and then subjected to a second CT scan. The dimensional changes of the second impression after steam sterilization were calculated by comparing the overlay of the two CT scans and expressed by color coding of the impression graphics. After the second scan, the impression was sent to a dental laboratory to fabricate a metal-ceramic crown or metal-ceramic fixed partial denture restoration to the one produced from the first impression (IMPx1) subjected only to disinfection. This process was repeated for four clinical cases. Conclusion Impressions made with AFFINIS® silicone impression materials in a rigid reinforced polycarbonate impression tray or in a metal dual-arch tray can be autoclaved. The overall dimensional stability of the impressions and the quality of single crowns and small fixed partial dentures made using IMPx2 was not compromised. The maximum dimensional differences at the preparations of the nonautoclaved and the autoclaved impressions were found to be within acceptable limits of about 50–100 ìm. Clinical Significance Steam sterilization of AFFINIS® impressions is possible without adversely affecting dimensional change. In addition, clinicians can clearly indicate to the dental practice and laboratory personnel that sterilization of the impressions has been performed, cross-contamination is unlikely, and the impressions present no apparent health hazard during transport and subsequent processing. Disclosure Dr. Kollefrath is head of Research and Development, Elastomers at Coltène/ Whaledent AG, Altstätten, Switzerland, the manufacturer of the impression material evaluated in this report. Citation Kollefrath R, Savary M, Schwela J. An Evaluation of the Fit of Metal-Ceramic Restorations Made with an Autoclaved Silicone- Based Impression Material. J Contemp Dent Pract [Internet]. 2010 July; 11(4):063-070. Available from: http://www.thejcdp.com/journal/ view/volume11-issue4-kollefrath

scholarly journals Functional Impression for Hemimandibulectomy Cases: An Alternative Technique

2011 ◽  
Vol 1 (2) ◽  
pp. 115-117
Author(s):  
Srinivas Rao ◽  
Savita F Akki
Keyword(s):  
Traditional Method ◽  
Functional Form ◽  
Alternative Technique ◽  
Partial Denture ◽  
Laboratory Technique ◽  
Impression Technique ◽  
Impression Materials ◽  
Distal Extension

ABSTRACT The altered cast impression technique is preferred to derive maximum support from the residual ridge in the distal extension partial denture hemimandibulectomy cases. The traditional method is designed primarily for making a secondary impression of the ridge in the functional form to correct a master cast. These functional impression techniques are time-consuming and involve multiple steps. This article describes a new clinical and laboratory technique in impression making. Emphasis is placed on recording the anatomical form of teeth and functional form of the residual ridge in an individual tray using two different impression materials eliminating secondary impression.

scholarly journals Survey of Impression Materials and Techniques in Fixed Partial Dentures among the Practitioners in India

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
Arvind Moldi ◽  
Vimal Gala ◽  
Shivakumar Puranik ◽  
Smita Karan ◽  
Sumit Deshpande ◽  
...  
Keyword(s):  
Urban Areas ◽  
Dental Practice ◽  
Anecdotal Evidence ◽  
Partial Denture ◽  
Fixed Partial Denture ◽  
Impression Materials ◽  
Irreversible Hydrocolloid ◽  
Dental Schools ◽  
The Ideal

Objective. Anecdotal evidence suggests that impression materials and techniques used in general dental practice for fixed partial dentures vary from those taught in dental schools. The aim of this survey was to integrate impression techniques evolved all over the years for fixed partial dentures and to know the techniques and materials which are used in the present day by the practitioners. Materials and Methods. A total of 1000 questionnaires were sent to various practitioners in India, out of which 807 questionnaires were filled. Results. The results showed that 84.8% of prosthodontists (65.56%, urban areas) use elastomeric impression materials as well as irreversible hydrocolloids and 15.2% use irreversible hydrocolloid only. Amongst other practitioners, 55.46% use irreversible hydrocolloid (45%, rural and semiurban areas) and 44.54% use elastomeric impression materials. Elastomeric impression technique practiced most commonly is putty reline with/without spacer (77.2%); other techniques are multiple-mix and monophase techniques. Conclusion. The ideal materials, technique, and armamentarium are required for the long-term success of the treatment for fixed partial denture. Also, if the ideal procedure is not followed, it will lead to a compromised fit of the final prosthesis and failure of the treatment.

scholarly journals Comparing the Dimensional Accuracy of Casts Obtained from Two Types of Silicone Impression Materials in Different Impression Techniques and Frequent Times of Cast Preparation

2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Ali Hafezeqoran ◽  
Mahdi Rahbar ◽  
Roodabeh Koodaryan ◽  
Tina Molaei
Keyword(s):  
In Vitro Study ◽  
Dimensional Accuracy ◽  
Repeated Measure ◽  
P Value ◽  
Two Stage ◽  
Impression Material ◽  
One Stage ◽  
Impression Materials ◽  
The One

Introduction. The dimensional accuracy of casts is essential in the quality of fixed prosthesis treatment, whereby the impression method is a very crucial factor affecting it. The aim of this in vitro study is to compare the dimensional accuracy of casts resulting from two types of silicone impression materials in different impression techniques and frequent times of cast preparation. Materials and Methods. A metal model was made from two prepared abutments, and 10 casts were prepared from each material technique (n = 40). The impressions were made by condensation and addition silicone (one-stage and two-stage impressions). The casts were made from same impressions 1 h, 24 h, and 14 days. The diameter, height, and the distance between two dies were recorded. Data were analyzed by repeated measure ANOVA (P value <0.05). Results. The dimensional accuracy of all four materials techniques of impression (diameter, height, and the distance between dies) was the same in different times of impression. Dimensional accuracy of the die diameter and distance between dies in one-stage (Speedex) condensation silicon and one-stage (Panasil) addition silicone did not differ significantly, and their one-stage method developed more accurate casts compared to the two-stage method of the same impression material. The height of the casts prepared from the one-stage method through Speedex and Panasil did not differ significantly from the two-stage method of the same impression material. Conclusion. One-stage condensation silicone and one-stage addition silicone material techniques offered the maximum dimensional accuracy in the obtained casts. The time of impression did not have any significant effect in the accuracy of any of the four impression material techniques.

scholarly journals Gigitiruan jembatan adesif sebagai perawatan alternatif pada kasus kehilangan satu gigi Adhesive bridge as alternative treatment to replace one missing teeth

2012 ◽  
Vol 11 (2) ◽  
pp. 105
Author(s):  
Christie Rizki ◽  
Deddy Firman ◽  
Aprillia Adenan
Keyword(s):  
Case Report ◽  
Missing Teeth ◽  
Posterior Teeth ◽  
Partial Denture ◽  
Fixed Partial Denture ◽  
Metal Framework ◽  
Acid Etch ◽  
Abutment Teeth ◽  
Adhesive Cement ◽  
Missing Tooth

Adhesive bridge is a fixed partial denture that consisted of pontic and cast metal framework retainer that cementedto abutment teeth by means of adhesive cement, used acid etch technique. Adhesive bridge can be used to replaceone or two anterior or posterior teeth. This case report focused on the making of adhesive bridge in anterior andposterior single missing tooth. By minimal preparation and unanesthesied teeth, patient satisfaction could beachieved. Treatment should be done as patient needed with the adequate clinical technique and specific materialmanipulation.

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