Water temperature and accuracy of alginate impressions

Harris, Wayne T.

doi:10.1016/0022-3913(69)90008-0

Cited by 17 publications

(6 citation statements)

References 3 publications

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“…[262728] This distortion is larger than the greatest dimensional change recorded for all the materials in the present study. This implied that even if the pouring of alginate is delayed by up to 1 h, it still produces stone casts that are clinically acceptable for partial denture framework construction.…”

Section: Discussionmentioning

confidence: 57%

The effect of pouring time on the dimensional accuracy of casts made from different irreversible hydrocolloid impression materials

et al. 2013

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Aims and Objectives:To determine the time dependent accuracy of casts made from three different irreversible hydrocolloids.Materials and Methods:The effect of delayed pouring on the accuracy of three different irreversible hydrocolloid impression materials – Regular set CA 37(Cavex, The Netherlands), regular set chromatic (Jeltrate, Dentsply), and fast set (Hydrogum soft, Zhermack Clinical) was investigated. A brass master die that contained two identical posts simulating two complete crown-tapered abutment preparations with reference grooves served as a standardized master model. A total of 120 impressions were made using specially prepared stock-perforated brass tray with 40 impressions of each material. The impressions were further sub-grouped according to four different storage time intervals: 0 min (immediately), 12 min, 30 min, and 1 h. The impressions were stored at room temperature in a zip-lock plastic bag. Interabutment and intraabutment distances were measured in the recovered stone dies (Type IV, Kalrock) using a profile projector with an accuracy of 0.001 mm. The data so obtained was analyzed statistically.Results:Results of this study showed no statistically significant differences in the accuracy of casts obtained at different time intervals.Conclusion:Because it is not always possible to pour the impression immediately in routine clinical practice, all irreversible hydrocolloid materials studied could be stored in a zip-lock plastic bag for upto 1 h without any significant distortion.

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Section: Discussionmentioning

confidence: 57%

The effect of pouring time on the dimensional accuracy of casts made from different irreversible hydrocolloid impression materials

et al. 2013

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“…High volume suction potentially results in over-drying of teeth and causing the alginate to stick to teeth during impression (Arora et al, 2015). In addition, alginate’s setting time decreases when mixed with warm water, therefore tap water was used (Harris, 1969). To prevent cast surface defects, glutaraldehyde disinfectant thoroughly washed off the impressions, which were stored in moist environment for 10 min to avoid desiccation and dimensional changes (Rentzia et al, 2011).…”

Section: Discussionmentioning

confidence: 99%

Evaluation of pre-alginate impression preparation methods in the surface accuracy of dental cast

Qahtani

Alrefaie

Altamimi

et al. 2019

The Saudi Dental Journal

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ObjectiveThe aim of this study was to investigate the influence of pre-preparation technique (finger smearing and saliva ejection) of alginate impressions on the quality and accuracy of dental casts.Materials and methodsTwenty mandibular impressions from 20 patients (10 males, 10 females) with an age range of 20–40 years were recorded using stock trays. A standard impression and pre-preparation technique for alginate were employed. This included removal of saliva with saliva ejector, smearing of alginate on occlusal surfaces of posterior teeth and smoothing of the material in the tray (Group-1: Test) and no drying and smearing or smoothing of the material prior to impression (Group-2: Control). Standardized disinfection, storage, pouring and removal from die stone techniques were used for all samples. Surface defects (nodules/blebs) on the occlusal surface of casts as examined with digital microscope, were classified according to their sizes and surface area into; Type-A (<500); Type-B (>500 <100); Type-C (>1000) in micrometers (μm). Data was tabulated and analyzed by SPSS using Anova and Tukey’s test.ResultsDefects were significantly higher (p < 0.01) in samples in Group-2 (1225.51 ± 823.44 μm) as compared to Group-1 (783.68 ± 501.41 μm). All types of defects (Types A, B and C) were significantly higher in samples from Group-2 as compared to Group-1.ConclusionsUse of pre-preparation technique of finger smearing and saliva ejector prior to alginate impressions resulted in significant reduction of surface nodules/blebs and enhanced the quality and accuracy of fabricated casts. Therefore, the use of saliva ejector, finger smearing on the occlusal surface of teeth and smoothening of alginate impression, immediately prior to intra-oral placement is clinically recommended.

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“…The majority of investigations studying the dimensional changes of alginate impression material were carried out in vitro (Civjan et al, 1972;Harris, 1969;Phillips et al, 1953;Skinner & Holbit, 1956;Skinner & Pomes, 1946, 1947. The different methods employed ranged from direct measurements of the impressions (Skinner & Carlsie, 1956;Skinner & Holbit, 1956;Skinner & Pomes, 1947) to evaluation of the fit of a cast gold crown on stone dies poured in alginate impressions (Gilmore et al, 1958;Phillips & Price, 1955).…”

Section: Discussionmentioning

confidence: 99%

Removal time: a factor in the accuracy of irreversible hydrocolloid impressions

Khaknegar

Ettinger

1977

J of Oral Rehabilitation

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Controversy exists regarding the correct time of removal of an alginate impression from the mouth. To investigate the effect of time of removal on accuracy, a series of alginate impressions were made of the lower left quadrant of a subject having a cast gold crown with four reference marks on tooth no. 19. The impressions were removed from the mouth at 1-5, 2, 3, 4-5 and 7 min after the insertion of the tray. Accuracy of the impressions was assessed by comparing the distances between the reference marks in stone casts with standard measurements taken from the gold crown prior to cementation. Impressions removed at 1-5 and 7 min produced the greatest distortions buccolingually. For the mesio-distal lengths all time intervals produced casts which were larger than the standard. The reasons for these findings are discussed and possible explanations are presented.

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Water temperature and accuracy of alginate impressions

Cited by 17 publications

References 3 publications

The effect of pouring time on the dimensional accuracy of casts made from different irreversible hydrocolloid impression materials

The effect of pouring time on the dimensional accuracy of casts made from different irreversible hydrocolloid impression materials

Evaluation of pre-alginate impression preparation methods in the surface accuracy of dental cast

Removal time: a factor in the accuracy of irreversible hydrocolloid impressions

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