scholarly journals The effects of mixing slurry water with type III gypsum on setting time, compressive strength and dimensional stability

2021 ◽  
Vol 54 (4) ◽  
pp. 195
Author(s):  
Chindy Fransiska Br Nainggolan ◽  
Dwi Tjahyaning Putranti
Keyword(s):  
Compressive Strength ◽  
Dimensional Stability ◽  
Setting Time ◽  
Testing Machine ◽  
Dimensional Change ◽  
Calcium Sulphate ◽  
Type Iii ◽  
Significant Difference ◽  
Change Of Type ◽  
Group B

Background: Type III gypsum is a material used to make dental master casts. It may be added to an accelerator, such as slurry water, to shorten setting time. Calcium sulphate in slurry water may affect setting time, compressive strength and dimensional stability. Purpose: The study evaluated the effect of slurry water on the setting time, compressive strength and dimensional stability of type III gypsum. Methods: Eighty-one samples were made of type III gypsum, divided into three groups: group A was gypsum mixed with 1% slurry water, group B, gypsum mixed with 2% slurry water and group C, gypsum mixed with distilled water. Each sample was formed using a standardised master mould. For testing setting time, a cylindrical mould 25 mm in diameter and height was used; for compressive strength testing, the cylindrical mould was 20 mm in diameter and 40 mm in height; and for dimensional stability testing, a pair of cylindrical, ruled block and mould were used. Setting time was tested using Vicat’s apparatus; compressive strength was tested using a universal testing machine; and dimensional stability was tested using digital callipers. The data were analysed by one-way analysis of variance (ANOVA) and least significant difference (LSD) tests. Results: One-way ANOVA and LSD tests showed significant differences in the effect of slurry water on the setting time, compressive strength and dimensional stability of type III gypsum (p<0.05). Conclusion: The use of slurry water can shorten setting time, decrease compressive strength and increase dimensional change of type III gypsum.

scholarly journals THE DIFFERENCE ON COMPRESSIVE STRENGTH AND DIMENSIONAL CHANGE OF COMMERCIALLY TYPE III GYPSUM COMPARED TO RECYCLE GYPSUM TYPE III TO PRODUCE WORKING CAST

2016 ◽  
Vol 19 (2) ◽  
pp. 121-127
Author(s):  
Siti Wahyuni ◽  
Haslinda Z Tamin ◽  
Harry Agusnar
Keyword(s):  
Compressive Strength ◽  
Laboratory Experiment ◽  
Manufacturing Process ◽  
Calcium Sulfate ◽  
Dimensional Change ◽  
Type Iii ◽  
Significant Difference ◽  
The Difference ◽  
Recycled Gypsum ◽  
One Way Anova

Gypsum is derived from pure calcium sulfate dehydrate which is a common material that is commonly used in denture manufacturing process. This study aimed to know the difference on compressive strength and dimensional change of commercially type III gypsum compared to recycle type III gypsum to produce working cast. The type of research is laboratory experiment. A total of 40 samples for each test is divided into five groups which consists of commercial type III gypsum,  pure recycled type III gypsum, pure recycled type III gypsum with 10%, 20%, 30% type III commercial gypsum. The difference on compressive strength and dimensional change between the groups was analyzed using one way ANOVA and is them tested with LSD test. The result showed that there was a significant difference (p<0,05) between compressive strength and dimensional change of commercial type III gypsum compared to pure recycled type III gypsum and pure recycled type III gypsum with 10%, 20% and 30% type III commercial gypsum. In conclusion, addition of 30% commercial gypsum in recycled gypsum the compressive strength was higher than other recycled gypsum types.  

Accelerating the Setting of Portland Cement Based Dental Materials Using Calcium Sulphates

2007 ◽  
Vol 361-363 ◽  
pp. 343-346 ◽  
Author(s):  
J.L. O’Beirne ◽  
R.M. Shelton ◽  
P.J. Lumley ◽  
M.P. Hofmann
Keyword(s):  
Compressive Strength ◽  
Portland Cement ◽  
Setting Time ◽  
Dental Materials ◽  
Testing Machine ◽  
Mineral Trioxide Aggregate ◽  
Calcium Sulphate ◽  
Sem Analysis ◽  
Initial Setting ◽  
Relative Porosity

Mineral trioxide aggregate (MTA) is a Portland cement (PC) based material used for sealing root canals however it has a long setting time which is undesirable for dental applications. This study investigated the effect of three different calcium sulphate additions for accelerating the initial setting of a PC based dental material, whilst attempting to maintain its high compressive strength and low relative porosity. Anhydrous calcium sulphate (CaS), Plaster of Paris, calcium sulphate hemihydrate (PoP) and Gypsum, calcium sulphate dihydrate (Gyp) were each added to PC at 5wt%, 10wt% and 20wt%. Initial setting times, compressive strengths and relative porosity were measured using the Gilmore Needles Test, a universal testing machine and a helium pycnometer respectively. Scanning electron microscopy (SEM) was used to observe any microstructural changes in cements. PoP and CaS had the most profound influence on the setting of PC. 20wt% CaS had the greatest effect on the setting time of PC (10min) although decreased the compressive strength by up to 40%, which may have arisen from the formation of microcracks, observed by SEM analysis. Additions of 10wt% PoP and CaS may have the potential to reduce the long setting time of PC based dental materials.

Effects of the addition of nanoparticulate calcium carbonate on setting time, dimensional change, compressive strength, solubility and pH of MTA

2016 ◽  
Vol 50 (1) ◽  
pp. 97-105 ◽  
Author(s):  
A. Bernardi ◽  
E. A. Bortoluzzi ◽  
W. T. Felippe ◽  
M. C. S. Felippe ◽  
W. S. Wan ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Calcium Carbonate ◽  
Setting Time ◽  
Dimensional Change

scholarly journals Frictional Characteristics of the Newer Low-friction Elastomeric Ligatures

2016 ◽  
Vol 6 (1) ◽  
pp. 19-23
Author(s):  
Amol Mhatre ◽  
VK Ravindranath ◽  
Sachin Doshi ◽  
Girish Karandikar ◽  
PS Vivek
Keyword(s):  
Testing Machine ◽  
Frictional Resistance ◽  
Minimal Amount ◽  
New Delhi ◽  
Low Friction ◽  
Significant Difference ◽  
Group A ◽  
Group B ◽  
New Generation

ABSTRACT Aim The aim of this in vitro study was to investigate the efficiency of the new generation of elastomeric ligatures with innovative designs (SlideTM and AlastiKTM Easy-to-Tie) in reducing frictional resistance (FR) during sliding mechanics as compared with conventional ligatures. Materials and Methods Sixty ligature samples divided into four groups were used for the study. Group A: QuiK-StiK™ (3M Unitek, Monrovia, CA, USA), Group B: AlastiK™ Easy-to-Tie (3M Unitek, Monrovia, CA, USA), Group C: Slide™ (Leone, Firenze, Italy), and Group D: SS ligatures 0.010” (Libral Traders, New Delhi, India). Universal Testing Machine, Instron was used for measuring FR at the bracket-wire interface. Results There was statistically significant difference in FR among all the four groups of ligatures tested (p < 0.001). Slide ligatures produced the least amount of FR followed by SS ligatures, Easy-to-Tie, and QuiK-StiK in the increasing order of the FR values registered. Conclusion SlideTM ligatures may represent a valid alternative to passive self-ligating brackets when minimal amount of friction is desired. Angulation introduced into the elastomeric ligatures reduces the friction in comparison to conventional elastomeric ligatures. How to cite this article Vivek PS, Ravindranath VK, Karandikar G, Doshi S, Mhatre A, Sonawane M. Frictional Characteristics of the Newer Low-friction Elastomeric Ligatures. J Contemp Dent 2016;6(1):19-23.

scholarly journals THE EFFECT OF MIXING SODIUM HYPOCHLORITE ON COMPRESSIVE STRENGTH OF TYPE III GYPSUM PRODUCT

2016 ◽  
Vol 4 (2) ◽  
pp. 132-140
Author(s):  
Rezy Kurnia ◽  
Hidayati Hidayati
Keyword(s):  
Compressive Strength ◽  
Sodium Hypochlorite ◽  
Testing Machine ◽  
Control Group ◽  
Distilled Water ◽  
Infectious Agents ◽  
Type Iii ◽  
Disinfectant Solution ◽  
One Way Anova

Disinfection is needed to avoid transmission of infectious agents. One of disinfectant solution used is sodium hypochlorite. Disinfection should be done without changing the quality of gypsum models, so the technique of mixing a disinfectant solution on gypsum powder can be used as an alternative. The purpose of this study was to determined the effect of mixing sodium hypochlorite to the compressive strength of type III gypsum product. The study was conducted at the Laboratory of Materials and Structures, Faculty of Engineering, Andalas University using laboratory experimental method with 30 pieces of type III gypsum models as samples. Samples were divided into 5 groups, that were mixed using 0.5% sodium hypochlorite, 1% sodium hypochlorite, 2% sodium hypochlorite, 5% sodium hypochlorite and distilled water as a control group. Measurement of the compressive strength was performed with a Universal Testing Machine (UTM). The results showed that the models were mixed with 0.5% sodium hypochlorite, 1% sodium hypochlorite, 2% sodium hypochlorite and 5% sodium hypochlorite reduced the average of the compressive strength compared to the models that are mixed with distilled water. One Way ANOVA test showed that was significantly differences (p<0.05) among groups of 0.5% sodium hypochlorite, 1% sodium hypochlorite, 2% sodium hypochlorite, 5% sodium hypochlorite and distilled water as a control group. It was concluded that there were effect of mixing sodium hypochlorite to reduced the compressive strength of type III gypsum product. Keywords: type III gypsum, compressive strength, sodium hypochlorite

scholarly journals Extended-pour and conventional alginates: effect of storage time on dimensional accuracy and maintenance of details

2021 ◽  
Vol 26 (3) ◽  
Author(s):  
Sandro Basso BITENCOURT ◽  
Isabela Araguê CATANOZE ◽  
Emily Vivianne Freitas da SILVA ◽  
Karina Helga Leal TURCIO ◽  
Daniela Micheline dos SANTOS ◽  
...  
Keyword(s):  
Dimensional Stability ◽  
High Stability ◽  
Digital Camera ◽  
Dimensional Accuracy ◽  
Dimensional Change ◽  
Clinical Results ◽  
Dimensional Changes ◽  
Plastic Bags ◽  
Significant Difference ◽  
Student’S T

ABSTRACT Objective: This study aimed to evaluate the dimensional stability and maintenance of details of conventional and high stability alginates up to 5-day storage. Methods: Two types of alginates were selected (n=10) for this study, conventional (Hydrogum) and high stability alginates (Hydrogum 5), which were produced with the aid of a cylindrical metal block and a ring-shaped metal mold (Specifications 18, 19, and 25, ANSI/ADA). Ten images were obtained from the molds for the dimensional stability test, which were taken immediately after their production and at each different storage periods (15 min, 24 h, 48 h, 72 h, 96 h, and 120 h) by a digital camera. The specimens were kept hermetically sealed in plastic bags (23°C) and then used to obtain 140 (n=70) dental stone models, used in the detail reproduction test, in which the angular accuracy of three grooves (20 µm, 50 µm, and 75 µm) was observed at each period. The details reproduction accuracy was classified using a predetermined score classification. Measurements of dimensional changes were made in the Corel DRAW X6 program. The data were submitted to the Student’s t-test (α?#8197;= 0.05). Results: A statistically significant difference concerning the size of the matrix was observed after 24h for both alginates, and a statistically significant negative linear dimensional change (contraction) was verified after 24 h of storage (1.52% for the high stability alginate, and 1.32% for the conventional alginate). The high stability alginate kept the full details for 72 hours, while the conventional alginate, for 24 h. Both alginates reproduced the 75 µm groove at all storage periods. Conclusion: Impressions made with both alginates presented satisfactory clinical results when the alginates were immediately poured.

Comparative evaluation of compressive strength of esthetic restorative materials

2018 ◽  
Vol 14 (1) ◽  
pp. 24
Author(s):  
Dr. Sazan Sherdil Saleem
Keyword(s):  
Compressive Strength ◽  
Testing Machine ◽  
Glass Ionomer Cement ◽  
Glass Ionomer ◽  
Group Iii ◽  
Group I ◽  
Significant Difference ◽  
Resin Modified Glass Ionomer ◽  
Restorative Materials ◽  
Ionomer Cement

The present study was aimed to evaluate and compare the compressive strength ofconventional glass ionomer cement with resin modified glass ionomer, compomer andmicrohybrid composite. A total of 40 specimens of esthetic restorative materials werefabricated using customized cylindrical teflon mould measuring 6mm height and 4mmdiameter and were grouped with ten specimens in each group, Group I: Conventionalglass ionomer cement (Fuji II). Group II: Resin modified glass ionomer (Fuji II LC).Group III: Compomer (Dyract AP) and Group IV: Microhybrid composite resin(Tetric Ceram).They were covered with Mylar strip and were cured using LED lightcuring unit. Compressive strength was evaluated using Universal testing machine. Theresult showed that there were a significant difference among the groups in whichTetric Ceram showed highest compressive strength and Fuji II showed the leastcompressive strength

Antimicrobial Activity of Type III Dental Gypsum Incorporated with 3-iodo-2-propynyl-butylcarbamate and its Physical Properties

2014 ◽  
Vol 1052 ◽  
pp. 322-326 ◽  
Author(s):  
Sroisiri Thaweboon ◽  
Passiri Nisalak ◽  
Boonyanit Thaweboon ◽  
Pornrachanee Sawaengkit ◽  
Plang Ngern Saksit ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Compressive Strength ◽  
Physical Properties ◽  
Setting Time ◽  
Brain Heart Infusion ◽  
Antimicrobial Activities ◽  
Microbial Reduction ◽  
Type Iii ◽  
Time Type ◽  
Infusion Agar

Dental impressions have been considered to be potential sources of microbial contamination from patients’ blood and saliva to dental personnel and prostheses fabricated on gypsum casts. Thus, the development of dental gypsum with antimicrobial activity to reduce cross-contamination between patients and laboratory personnel is needed. This study aims to evaluate the influence of incorporation of 3-iodo-2-propynyl-butylcarbamate (IPBC) into type III dental gypsum on its antimicrobial activities and physical properties such as dry compressive strength and setting time. Type III dental gypsum (The Siam Moulding Plaster Co., Ltd, Thailand) incorporated with 3 concentrations of IPBC (0.01%, 0.005% and 0.001% w/w) was tested compared with the control, gypsum without disinfectant. Microorganisms tested were Staphylococcus aureus ATCC 6538, Pseudomonas aeruginosa ATCC 27853 and Candida albicans ATCC 1023. One hundred μL of each microbial suspension (108 CFU/mL) was dropped on hydrocolloid impression (Jeltrate; Caulk/Dentsply, Milford, DE) and left dry. All types of gypsum mixes were prepared and poured into the impressions and allowed to set for 60 min. Then the gypsum samples were removed and the microbial contact surfaces were imprinted on Brain Heart Infusion agar plates. After incubation, colonies appeared on agar were gram-stained and counted. The dry compressive strength and setting time were tested in accordance with International Standard (ISO) 6873: 1998 (E). Dental gypsum containing IPBC showed antimicrobial activity against all tested microorganisms with the percentage of microbial reduction ranging from 19.4% to 70.6%. Among all types of dental gypsum, no significant differences in dry compressive strength and setting time were observed. The newly developed type III dental gypsum incorporated with IPBC had antimicrobial effects against all tested microorganisms. The physical properties of the modified dental gypsum were within the ISO standards. However, further investigation on other properties such as dimensional stability, detail reproduction and clinical usage are still needed.

Titanium Dioxide Nanoparticles and Cetylpyridinium Chloride Enriched Glass-Ionomer Restorative Cement: A Comparative Study Assessing Compressive Strength and Antibacterial Activity

2019 ◽  
Vol 43 (1) ◽  
pp. 42-45
Author(s):  
Nida Hamid ◽  
Ravishankar Lingesha Telgi ◽  
Amit Tirth ◽  
Vaibhav Tandon ◽  
Smita Chandra ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Antibacterial Activity ◽  
Titanium Dioxide ◽  
Tio2 Nanoparticles ◽  
Titanium Dioxide Nanoparticles ◽  
Cetylpyridinium Chloride ◽  
Testing Machine ◽  
Glass Ionomer Cement ◽  
Glass Ionomer ◽  
Significant Difference

Objective: To evaluate the addition of titanium dioxide (TiO2) nanoparticles and cetylpyridinium chloride (CPC) on the compressive strength and antibacterial activity of conventional glass-ionomer cement (GIC). Study design: TiO2 nanoparticles enriched GIC was prepared by adding 3% TiO2 nanoparticles (w/w) into the powder component of conventional GIC. CPC containing GIC was developed by incorporating 1% CPC (w/w) into conventional GIC powder. Samples were segregated into three groups: GIC with 3% TiO2 nanoparticles, GIC with 1% CPC and unmodified conventional GIC. Compressive strength was assessed using the universal testing machine on cylindrical specimens made from each material. Antibacterial activity was assessed by measuring inhibition zones on Mitis Salivarius Bacitracin (MSB) agar inoculated with pure strain of Streptococcus mutans (S. mutans). Results: GIC containing TiO2 nanoparticles exhibited significantly greater compressive strength as compared with CPC and conventional GIC groups (P &lt; 0.01). However, there was no significant difference between the compressive strengths of CPC and conventional GIC group (P &gt;0.05). Antibacterial activity was significantly greater for TiO2 group than conventional GIC (P &lt;0.05). CPC increased the antibacterial activity of conventional GIC, though not significantly. Conclusion: The addition of 3% TiO2 nanoparticles improves the compressive strength of GIC as well as its antibacterial activity against S. mutans.

scholarly journals Influence of Octacalcium Phosphate addition on physical-mechanical properties of Glass Ionomer Cement

2018 ◽  
Vol 32 (3) ◽  
pp. 127 ◽  
Author(s):  
Gabriela De Souza Balbinot ◽  
Isadora Martini Garcia ◽  
Susana Maria Werner Samuel ◽  
Fabricio Mezzomo Collares ◽  
Vicente Castelo Branco Leitune
Keyword(s):  
Tensile Strength ◽  
Setting Time ◽  
Testing Machine ◽  
Glass Ionomer Cement ◽  
Octacalcium Phosphate ◽  
Glass Ionomer ◽  
Significant Difference ◽  
Diametral Tensile Strength ◽  
Phosphate Addition ◽  
Ionomer Cement

OBJECTIVE: The aim of this study was to evaluate the influence of octacalcium phosphate (OCP) addition to conventional glass ionomer cement (GIC).METHODOLOGY: A commercial glass ionomer cement (Vidrion R – S.S. White Artigos Dentários Ltda – Rio de Janeiro, Brazil) was used in this study. OCP was added to powder in 1.5 and 3 wt%. GIC without OCP addition was used as control. Specimens were produced to evaluate radiopacity, setting time and diametral tensile strength of cements. Radiopacity was assessed by phosphor plate system with alluminium step-wedge for comparison. For setting time determination, Gilmore needle (100 g) was used to determine final setting reaction. Diametral tensile strength was measured in a universal testing machine. Data were analyzed by one-way ANOVA at a significance level of 95%.RESULTS: Results showed no statistically significant difference in tested properties with octacalcium phosphate addition in any concentration.CONCLUSION: OCP addition to GIC did not influence materials properties.

Sign in / Sign up

Export Citation Format

Share Document