Effect Of Lignocaine Addition On The Properties Of Irreversible Hydrocolloid Impression Material (original) (raw)
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IOSR Journals , 2019
Background The study conducted to determine diamentional stability of irreversible hydrocolloid impression materials stored at different time interval.Diamensional stability of irreverssible hydrocolloids is an important and thoroughly discussed topic. Many studies says that to prevent distortion, it is generally recommended that irreversible hydrocolloid impressions to be poured immediately or within a few minutes from removal from the mouthwithout wrapping in a wet paper towel. Aim The aim of this study was to determine dimensional stability of irreversible hydrocolloid impression materials. Methods In this studyIvorine teeth are modified on a model to allow measurements of tooth and arch width. And impressions were made and generated casts immediately and at additional times of 1/2hr dry,1/2hr wet,1hr wet,4hr wet.recorded tooth and arch widths on the casts and compared the measurements with those for the standard model. Results Traditional irreversible hydrocolloids were generally stable when poured immediately. However, stability decreased as time elapsed. New irreversible hydrocolloid substitutes appear to allow delay in pouring time and repouring of impressions without significant side effects. Conclusions:- Shorter storage time of irreversible hydrocolloid impressions before pouring is desirable, although this may not be necessary for the extended-pour types. The lack of a standardized technique for studying the effect of storage condition, makes it difficult to make clear recommendation.
Addition of mouth washes as a disinfectants for irreversible hydrocolloid impression material
2014
Internal disinfection of irriversible hydrocolloid was the prefered disinfection technique because it allows immediate pouring of the impression after removal of the impression from the patient , s mouth. Addition of disinfectant to the impression materials was superior to immersion or spraying techniques. The purpose of this study was to assess the surface antimicrobial efficacy, setting time, viscosity and dimensional stability of irreversible hydrocolloid impression material when mixed with two mouth washes and compared with the spray and immersion techniques. The used mouth washes were Tantum verde and Hexitol for mixing and disinfection of alginate impression material. The results indicated that the addition of mouth washes to be mixed with irreversible hydrocolloid impression material produced larger inhibition zones of growth than immersion and spray techniques. The setting time and viscosity were not adversely affected. The dimensional accuracy of the resulted stone cast was...
Background: Alginate impression material is widely used for recording accurate impressions to fabricate various oral appliances such as crowns, bridges, partial dentures and complete dentures. Alginate impressions are dimensionally unstable and hence it should be poured immediately to form exact cast. The impressions are sometimes sent to the nearby laboratories for making cast and models. For maximum dimensional stability, the cast should be poured immediately or it can be stored in lower concentration NaCl or K2SO4 solutions during transport to distant laboratories. Objective: To evaluate the effect of various storage environments on the dimensional stability of irreversible hydrocolloid alginate impressions and to select a suitable medium for long time storage. Materials and Methods: Alginate impression material is supplied in powder form and is mixed with distilled water and poured on cylindrical hollow plastic mold. After setting, the sample is removed, weighed and then stored for 24 hours in a) exposed to atmosphere at 28+2°C(60 +5% relative humidity), b) refrigeration at 8+2°C, c) refrigeration in closed plastic sachets at 8+2°C, d) humidity chamber at 28+2°C and 8+2°C (100% relative humidity), e) distilled water f) solutions of NaCl at three different concentration and h) solutions of K2SO4 at three different concentration. The dimensional stability is measured by weight loss method and ion released during syneresis and imbibitions in storage media by using ion selective electrode method. Results: Alginate impressions were more stable at lower concentrations of NaCl & K2SO4 and dimensional changes are less than +0.6%. At higher concentrations more syneresis occurs, hence causes shrinkage of impressions. Impressions stored in open atmosphere showed maximum dimensional change followed by refrigerated sample, closed plastic sachets in refrigerator, humidity chamber and distilled water. Conclusion: For maximum dimensional stability, the impression should be poured immediately with cast material or the impression can be stored 24 hours in lower concentrations NaCl or K2SO4 solutions during transport to distant laboratories. This can also be stored in humidity chamber or zip lock polythene sachets in refrigerator at 8+2°C up to 6 hours. This saves chair side time and helps to produce accurate results. Keywords: Irreversible hydrocolloid, model and cast, syneresis, imbibitions, ion release, pH, dimensional stability.
Marine Drugs
Hydrocolloids were the first elastic materials to be used in the dental field. Elastic impression materials include reversible (agar-agar), irreversible (alginate) hydrocolloids and synthetic elastomers (polysulfides, polyethers, silicones). They reproduce an imprint faithfully, providing details of a high definition despite the presence of undercuts. With the removal of the impression, being particularly rich in water, the imprints can deform but later adapt to the original shape due to the elastic properties they possess. The advantages of using alginate include the low cost, a better tolerability on the part of the patient, the ease of manipulation, the short time needed for execution, the instrumentation and the very simple execution technique and possibility of detecting a detailed impression (even in the presence of undercuts) in a single step. A comprehensive review of the current literature was conducted according to the PRISMA guidelines by accessing the NCBI PubMed databas...
An in vitro investigation into the physical properties of irreversible hydrocolloid alternatives
The Journal of Prosthetic Dentistry, 2010
The new materials evaluated may prove advantageous in clinical practice compared to traditional irreversible hydrocolloid impression material. As has been demonstrated in vitro, they are more dimensionally stable and exhibit better detail reproduction both when impressed and when cast with gypsum. However, further clinical testing may be warranted to establish this. Statement of problem. A number of manufacturers have introduced new products that are marketed as alternatives to irreversible hydrocolloid impression materials. However, there is a paucity of laboratory and clinical research on these products compared to traditional irreversible hydrocolloid. Purpose. The purpose of this study was to evaluate the detail reproduction, gypsum compatibility, and linear dimensional change of 3 recently introduced impression materials designed as alternatives to irreversible hydrocolloid. Material and methods. The tested materials were Position Penta Quick, Silgimix, and AlgiNot. An irreversible hydrocolloid impression material, Jeltrate Plus Antimicrobial, served as the control. The parameters of detail reproduction, gypsum compatibility, and linear dimensional change were tested in accordance with ANSI/ADA Specifications No. 18 and 19. The gypsum compatibility was tested using a type III stone (Microstone Golden) and a type IV stone (Die-Keen Green). The data were analyzed using the Kruskal-Wallis rank test and the Mann-Whitney U test (α=.05). Results. The test materials demonstrated significantly (P<.001) better detail reproduction than the control material. Silgimix exhibited the best compatibility with Microstone, whereas AlgiNot and Position Penta Quick exhibited the best gypsum compatibility with Die-Keen. An incompatibility was observed over time between the Jeltrate control material and the Microstone gypsum material. For linear dimensional change, the mean dimension of the control material most closely approximated the distance between the lines on the test die, but it exhibited the greatest variability in measurements. All of the test materials exhibited linear dimensional change within the ADA's accepted limit of 1.0%. Conclusions. The 3 new impression materials exhibited better detail reproduction and less variability in linear dimensional change than the irreversible hydrocolloid control. Gypsum compatibility varied with the brand of gypsum used, with an incompatibility identified between the control material (Jeltrate Plus Antimicrobial) and Microstone related to surface changes observed over time.
Journal of Nepalese Prosthodontic Society
Introduction: Impression materials are used to record the anatomical topography of oral tissues. Irreversible hydrocolloid is an impression material routinely used in dentistry. However, it retains bacteria, 2 to 3 times higher than other impression material. Spraying and immersion technique has been employed for disinfection of irreversible hydrocolloid with varying degree of success. Thus the need of impression material that has self-disinfecting capacity seems to be very important to have infection control in dentistry. Materials and Methods: This invitro study was done in two parts. Assessment of self-disinfecting capacity of irreversible hydrocolloid impression material mixed with different concentrations of chlorhexidine solution and dimensional stability of irreversible hydrocolloid impression material mixed with different concentrations of chlorhexidine solution. For assessment of self-disinfecting capacity, irreversible hydrocolloid was mixed with various concentrations of ...
2017
Amac: Bu in-vitro calismanin amaci; uzatilmis saklama surelerinin, uzatilmis model elde etme suresine sahip irreversible hidrokolloid olcu malzemelerinin yirtilma dayanimi uzerine etkisini incelemektir. Materyal-Metod: Bes ticari (BluePrint Xcreme, Hydrogum 5, Kromopan, Alginmax ve Alginelle) ve bir ozel formule edilmis uzatilmis model etme suresine sahip irreversible hidrokolloid olcu malzemesi kullanilarak ISO 21563:2013 standartlarina uyumlu seksen dort adet numune hazirlanmistir. Her bir olcu malzemesine sait numuneler rastgele iki gruba ayrilmis (n=7) ve hemen veya 120 saatlik saklama suresi sonunda yirtilma testine tabi tutulmuslardir. Yirtilma dayanimi degerleri N/mm cinsinden ifade edilmis ve veriler iki yonlu varyans analizi testi (irreversible hidrokolloid markasi, saklama suresi) kullanilarak analiz edilmistir. Coklu karsilastirmalara, Tukey testi kullanilarak yapilmistir (p=0.05). Bulgular: Uzatilmis model etme suresine sahip irreversible hidrokolloid olcu malze...