A clinical evaluation of fixed partial denture impressions

Samet, Nachum; Shohat, Michal; Livny, Alon; Weiss, Ervin I.

doi:10.1016/j.prosdent.2005.05.002

Cited by 72 publications

(65 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Despite the fact that silicones have absolute dimensional accuracy, especially addition silicones, Samet et al [14] showed in his research that nearly 90% of the cast models have one or more visible errors and therefore require further research and improvement.…”

Section: Discussionmentioning

confidence: 99%

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

Naumovski

Kapushevska

2017

Prilozi

View full text Add to dashboard Cite

A quality-made dental impression is a prerequisite for successful fixed-prosthodontic fabrication and is directly dependent on the dimensional stability, accuracy and flexibility of the elastomeric impression materials, as well as on the appropriately used impression techniques. The purpose of this paper is to provide a literature review of relevant scientific papers which discuss the use of various silicone impression materials, different impression techniques and to evaluate their impact on the dimensional stability and accuracy of the obtained impressions. Scientific papers and studies were selected according to the materials used, the sample size, impression technique, storage time, type of measurements and use of spacer for the period between 2002 and 2016. In the reviewed literature several factors that influence the dimensional stability and accuracy of silicone impression molds, including the choice of the type of viscosity, impression material thickness, impression technique, retention of the impression material on the tray, storage time before the casting, number of castings, hydrophilicity of the material, release of byproducts, contraction after polymerization, thermal contraction and incomplete elastic recovery were presented. The literature review confirmed the lack of standardization of methodologies applied in the research and their great diversity. All findings point to the superiority of the addition silicone compared to the condensation silicone.

show abstract

Section: Discussionmentioning

confidence: 99%

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

Naumovski

Kapushevska

2017

Prilozi

View full text Add to dashboard Cite

show abstract

“…8 Evaluating impressions submitted to dental laboratories, one study found 89% of impressions contained errors in the registration of the preparation which could potentially impact the accuracy of the restorations. 9 This was echoed in several articles examining impressions submitted to laboratories in Great Britain, with approximately 44% of impressions deemed unsatisfactory. 4, 8, 10 A call for improved impressions has also been made in the United States, 5, 6 and has apparently been a concern for decades.…”

Section: Introductionmentioning

confidence: 99%

“…These clinical factors include visible defects such as: incomplete margin detail, air bubbles, voids, pulls, unset impression material, contamination with blood or saliva, cords or cotton rolls trapped in the impression, inadequate union of materials, improper tray selection, and debris in the impression. 5, 9, 13 Other errors that distort the impression, but which might be harder to visualize, include impression recoil, detachment of the impression material from the tray, and plastic deformation. 13 Impression recoil occurs when an impression is inserted with some pressure, which upon release changes the dimension of the impression; it is typically associated with a two-stage putty wash technique.…”

Section: Introductionmentioning

confidence: 99%

Impression evaluation and laboratory use for single-unit crowns

McCracken¹,

Litaker²,

George³

et al. 2017

The Journal of the American Dental Association

View full text Add to dashboard Cite

Background Objectives were to: (1) determine the likelihood that a clinician accepts an impression for a single-unit crown; and (2) document crown remake rates. Methods A questionnaire was developed that asked dentists about techniques used to fabricate single-unit crowns. Dentists were shown photographs of 4 impressions and were asked to accept or reject the impression. Answers were correlated with dentist and practice characteristics. Other questions pertained to laboratory usage and crown remake rates. Results Response rate was 83% (1,777 of 2,132 eligible dentists). Of the impressions evaluated, 3 received consistent responses, with 85% agreement. One impression was more equivocal; 47% accepted the impression. The likelihood of accepting an impression was significantly associated with the clinician’s sex, race, ethnicity, and practice busyness. Clinicians produce 18 crowns per month on average, and 9% used in-office milling. Most (59%) reported a remake rate of less than 2%, while 17% reported a remake rate >4%. Lower remake rates were significantly associated with more-experienced clinicians, optical impressions, and not using dual-arch trays. Conclusions While dentists were largely consistent in their evaluation of impressions (greater than 85%), non-clinical factors were associated with whether an impression was accepted or rejected. Lower crown remake rates were associated with more-experienced clinicians, optical impressions, and not using dual-arch trays. Practical Implications These results provide a snapshot of clinical care considerations among a diverse group of dentists. Clinicians can compare their own remake rates and impression evaluation techniques to this sample when developing best practice protocols.

show abstract

“…The impression of the supporting teeth and of the adjacent structures is important due to their strategic value, because it represents the transfer of the clinical situation to the laboratory in the form of articulated models [4][5][6][7][8] . If this transposition is not realized in an accurate manner, it will be almost impossible for the dentist to carry out a prosthetic rehabilitation that meets the particular specific requisites that will guarantee its long-term longevity, in harmony with aesthetics, the periodontum, pulp and other components of the masticatory system.…”

Section: Introductionmentioning

confidence: 99%

Influence of Elastic Recovery Time on Dimensional Stability of Polydimethylsiloxane (PDS)

et al. 2013

View full text Add to dashboard Cite

Abstract:The aim of this study was to determine the influence from the recovering time on the dimensional stability of polydimethylsiloxane (Speedex, Coltène/Whaledent Company, Altstätten, Switzerland) prior to type IV dental stone pouring. The double impression technique was utilized with uniform spacing of 1 mm for the wash paste, at 30 minutes, 24 hours and 72 hours after making the impression using an individual perforated metal tray. After the preparation of the impressions, six stone models were made by the standard procedure for all the impressions. The dimensional alterations (mm) of the models obtained were submitted to analysis of variance (ANOVA) and Tukey's test (α = 0.05). No statistically significant difference between the three groups (30 minutes, 24 hours and 72 hours) were recorded for either the height or diameter of the samples. However, upon comparing the results of the three groups with the metal standard model, there was a significant difference between group 1 (30 min) in relation to the diameter of the standard metal die (p = 0,047). The condensation silicone Speedex shows satisfactory dimensional stability, where dental stone models can be poured with assurance up to 72 hours after preparation of the impression.

show abstract

A clinical evaluation of fixed partial denture impressions

Cited by 72 publications

References 12 publications

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

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

Impression evaluation and laboratory use for single-unit crowns

Influence of Elastic Recovery Time on Dimensional Stability of Polydimethylsiloxane (PDS)

Contact Info

Product

Resources

About