scholarly journals The Effects of Chemical Disinfection on Dimensional Stability among Different Type of Impression Addition Silicon Materials

Author(s):  
Salah A. Yousief ◽  
Khames T. Alzahrani ◽  
Suha M. Alhuwairini ◽  
Fai Y. Alharbi ◽  
Dalal A. Eissa ◽  
...  

Introduction: Saliva and blood contaminated impressions are often a source of cross contamination between the clinic and dental laboratory. Explicit communication and observance of an infection control protocol for handling of dental impressions must exist among the office staff as well as between office and dental laboratories. Though disinfection of impression is routinely followed, autoclaving elastomeric impression is an effective method of sterilization them. Objectives: The purpose of this study was to evaluate dimensional stability and detail reproduction of a new addition silicon impression material after disinfection. Methods: In this study, a total of twenty impressions for the master model using heat resistant plastic stock trays. The twenty impressions were divided into two groups according to disinfection technique: (Table 2) Group 1: (n=10) Control group, untreated impressions. (C.G) Group 2: (n=10) Impressions were chemically disinfected. (D.G). after all impressions treatment, they were poured with extra hard stone (type IV) to get stone casts. Dimensional accuracy and detail reproduction of the impression material were evaluated indirectly through the recovered improved stone casts from impressions of the master model using the travelling microscope. Results: Cross arch distance (A): Epoxy resin master model cross arch distance measurement (A) was (41.36 mm). 1.1 Measurements of the cross-arch distance of stone casts Control group (C.G): The mean and standard deviation values of distance (A) in stone models obtained from C.G. were 41.553 ± 0.170 mm. Disinfection group (D.G): The mean and standard deviation values of distance (A) in stone models obtained from D.G were 41.368 ± 0.083 mm. ANOVA test showed that there was a statistically difference shrinkage between the groups (P-value = 0.006). 1.2 Measurement of the dimensional changes in the cross-arch distance of the different groups. The mean and standard deviation values of cross arch distance changes in stone models of C.G. were 0.191 ± 0.170 mm. while dimensional changes in stone models obtained from D.G. were 0.006 ± 0.082 mm. Conclusion: The purpose of this study was to evaluate dimensional stability and detail reproduction of a new addition silicon impression material after disinfection. In this study an epoxy resin master model was duplicated from a modified dentate mandibular model. Within the limitations of this study, it could be concluded that Chemical disinfectant of polyvinyl siloxane impression material can be successfully used in making fixed partial dentures.

Author(s):  
Abdulrahman Jafar Alhaddad

Aims: The goal of this research is to assess the effect of steam autoclave sterilization due to the impact of Covid-19 on the accuracy of the elastomer impression materials. Study Design: In vitro study. Place and Duration of Study: Department of oral and Maxillofacial Prosthodontics, King Abdul-Aziz University, Jeddah; Saudi Arabia, between June 2021 and November 2021. Methodology: The following materials were used in this study: fully dentate master cast, metal trays, elastomer impression material (addition silicon), type IV stone. Forte impressions made using the metal tray and elastomer impression materials. The impressions were separated equally into two groups: Control group (C.G), untreated impressions. Sterilized group (S.G): Impressions were sterilized by using the steam autoclave. To make stone castings for each group, they were poured with type IV stone. The traveling microscope was used to evaluate the impression material's dimensional accuracy and detail reproduction with and without autoclave sterilization. Results: The cross-arch distance (X) of the master model was measured (41.29 mm), While the cross arch distance (X) in the control group (C.G) of the untreated impressions  had a mean and standard deviation  of 41.492 ± 0.150 mm. In the tested group  (S.G) : the sterilized impression, we found the cross-arch distance (X) had a mean and standard deviation of 41.628 ± 0.223 mm. The master model's Anteroposterior distance (A-P) was measured (21.12 mm). For the control group  (C.G) : we found the mean and standard deviation value reading of the A-P distance were 20.899 ± 0.79 mm. For (S.G) group: we found the mean and standard deviation reading of the A-P distance were 19.992± 0.482 mm. Conclusion: Steam autoclave sterilization of the elastomer impression material should be considered carefully, especially when fabricating fixed partial dentures. If the impression material is to be used in making diagnostic castings, conventional steam autoclave sterilization of the elastomers impression material may be sufficient for patients.


2016 ◽  
Vol 10 (04) ◽  
pp. 507-511 ◽  
Author(s):  
Hussien Abdalfatah Ismail ◽  
Hani Asfour ◽  
Souaad Abdulelah Shikho

ABSTRACT Objectives: The aim was to evaluate the effect of adding povidone (PVP) iodine powder with different concentrations to irreversible hydrocolloid on both microbiological and dimensional stability. Materials and Methods: Regular set of (alginate) irreversible hydrocolloid was selected as control group. PVP-iodine powder was mixed with the alginate powder at concentrations of 1, 5, 10, 15, and 20% by weight (test groups). All specimens were tested for their antimicrobial effect against Streptococcus mutans and Staphylococcus aureus as well as dimensional stability. Results: The results of test groups showed that concentrations 1, 5, and 10, weight % had little effect against S. mutans and S. aureus microorganisms. While concentrations 15 and 20 weight % had demonstrated greater effect on microbial growth. The mean of dimensional stability in mm of modified alginate with PVP-iodine at 15 and 20 weight % was –0.119 ± 0.255 and –0.035 ± 0.074, respectively. While the mean dimensional stability in mm of unmodified alginate was –0.112 ± 0.176 . The results of dimensional stability showed that 15 and 20 concentrations of test groups adversely affect the dimensional stability. The adverse effect was noticed to be significant in concentration 20%, where as it was nonsignificant in 15% concentration. Conclusion: Modified alginate impression material with 15 weight % PVP-iodine powered give the material, a self-disinfected properties with less deteriorating effect on dimensional stability.


2007 ◽  
Vol 17 (5) ◽  
pp. 487-498 ◽  
Author(s):  
Birna Bjarnason-Wehrens ◽  
Sigrid Dordel ◽  
Sabine Schickendantz ◽  
Constanze Krumm ◽  
Daniel Bott ◽  
...  

AbstractTheir perceptual and motor experiences determine the physical and motor development of children, and impact also on their emotional, psychosocial, and cognitive development. Our aim, therefore, was to evaluate motor development in children with congenitally malformed hearts compared to their healthy peers.We compared 194 children, with a mean age of 10.0 years, and standard deviation of 2.7 years, representing the entire spectrum of congenital cardiac disease, to a control group of 455 healthy children, having a mean age 9.6 years, with standard deviation of 2.17 years. The bodily coordination test for children was used to examine motor development.Of the children with congenitally malformed hearts, 26.8% showed moderate, and 31.9% had severe disturbances of motor development, compared to 16.5% and 5.5% of the control group, the p-value for these differences being less than 0.001. The mean motor quotient adjusted for age and gender was lower in the children with congenitally malformed hearts than in their healthy peers, at 79.6, with standard deviation of 18.9 as opposed to 96.6, with standard deviation of 15, this difference having a p-value of less than 0.001. Depending on the presence, and/or the degree, of residual sequels, the children with congenitally malformed hearts were divided into two subgroups, with either no or mild residual sequels, or with significant sequels. The mean motor quotient was lower in those with significant residual sequels, at 75, with standard deviation of 19.3, as opposed to 83, with standard deviation of 17.9, the p-value for this difference being less than 0.01. In both subgroups, the mean motor quotient was lower, with a p-value of less than 0.01, than in the control group.Our findings show that children with congenitally malformed hearts have deficits in their motor development, these being found in the presence of no or mild sequels, as well as with significant residual sequels. Parental overprotection may contribute to these findings.


2018 ◽  
Vol 35 (4) ◽  
pp. 198-204
Author(s):  
Sami A. Nizam ◽  
Rhys Branman

Neck contouring is one of the most frequent reasons patients seek cervicofacial rhytidectomy. But what makes for aesthetically pleasing youthful neck? Ellenbogen and Karlin described 5 criteria in their 1980 landmark publication, including having a cervicomental angle between 105° and 120° and a visible subhyoid depression. Recent advances in neck anatomy have revealed the existence of ligamentous like structures attaching the skin and platysma to the hyoid. These have been termed the hyoplatysmal ligament (HPL) and cervicomental suspensory angle ligament by different authors. This study was undertaken to determine whether surgically reestablishing the above structures utilizing a hyoid suspension technique resulted in statistically significant changes in cervicomental contour. A retrospective chart review was performed from January 2014 to present. After December 2016, the second author began utilizing a hyoid suspension technique where the inter- and subplatysmal fat was resected and the HPL was reestablished surgically (hyoid suspension). Cases before this date served as controls if a similar neck manipulation was performed without reestablishing the HPL. In total, 104 charts were queried, of which, 21 charts fit inclusion criteria to serve as controls and 20 as the experimental group. Before and after profile pictures were then compared for differences in cervicomental angle utilizing commercially available imaging software (Canfield Mirror, Parsippany, New Jersey). An unpaired Student t test was then performed to determine whether this 2 groups differed significantly utilizing a P value of .05 to denote statistical significance. The mean difference between pre- and postoperative cervicomental angle for the control group was 17.38° with a standard deviation of 8.05°. The mean difference between pre and postoperative cervicomental angle for the experimental group was 28.75° with a standard deviation of 15.52°. The resulting 11.37° difference in cervicomental angle between the 2 groups was found to be statistically significant with a P value of .0051. Our cosmetic surgical and anatomical knowledge continues to progress. Brant first described a ligamentous structure that attaches the platysma to the hyoid. Through biomechanical testing, he noted this ligament to be one of the weakest in the face and neck. Thereafter, in 2016 Yousif et al and Le Lourn separately described similar procedures to attach the platysma to the hyoid, in effect reestablishing this ligament. Utilizing one simple surgical maneuver, the hyoid suspension reestablishes the HPL. This surgically creates an acute cervicomental angle, resulting in less platysmal displacement postoperatively, with virtually no addition to surgical time or morbidity.


2021 ◽  
Vol 15 (1) ◽  
pp. 658-663
Author(s):  
Noorhayati R. Mohd ◽  
Ros A. Omar ◽  
Enas A. Etajuri

Aims: This study aimed to evaluate and compare the dimensional stability of two elastomeric impression materials, namely polyvinyl siloxane (PVS) and vinyl siloxanether (VSE), subjected to chemical immersion and microwave irradiation for disinfection. Materials and Methods: Sixty discs of PVS and VSE impression materials each were prepared using a stainless-steel test die and ring in accordance with ANSI/ADA Specification No. 19. Twenty discs of each impression material were disinfected by chemical immersion for 10 min; another 20 discs were subjected to dry microwave irradiation for 3 min. The other 20 discs served as a control group. Dimensional stability measurements were then performed using an image analyzer at 20× magnification. The data were analyzed by one-way analysis of variance (α=0.05) and Bonferroni (post hoc) test for multiple comparisons to detect significant differences between the groups. Results: When subjected to microwave irradiation, both PVS and VSE showed dimensional changes, but the changes were within the limit of 1.5% set by ANSI/ADA (P<0.00). VSE showed markedly better results than PVS for both disinfection methods. The immersion disinfection method resulted in a higher average percentage of linear dimensional changes than both the microwave irradiation and the control for VSE and PVS impression materials. Conclusion: VSE exhibited excellent dimensional stability than PVS under both chemical immersion and microwave irradiation. Microwave irradiation using conventional microwave ovens can be used in clinical settings as an alternative to other disinfection techniques because the dimensional changes of the elastomeric impression materials subjected to microwave irradiation have been observed to be within the clinically acceptable limit set by the ANSI/ADA standard.


2021 ◽  
Vol 17 (2) ◽  
pp. 103-109
Author(s):  
Ni Kadek Ari Astuti ◽  
◽  
Sumantri Sumantri ◽  
Iyan Anugrah Nasir ◽  
◽  
...  

ntroduction: Dental impression material is one of the agents of infection transmission in the dentist's work environment. Cross infection can occur through the interaction of microorganisms and impression material. To prevent cross infection, it is necessary to disinfect alginate impressions. One of the effective natural ingredients that can be used as a disinfectant is betel leaf. The effect of using disinfectant can affect the dimensional stability of the alginate mold. Purpose: This study aims to determine the effect of disin- fection by spraying a decoction of 25% betel leaf and 0.2% chlorhexidine on the dimensional stability of alginate molds. Materials and Methods: The research method used was an experimental laboratory with a post-test only control g roup design using 2 7 samples consisting of three treatments (negative control group, positive control group, and treatment group) which were measured using a digital caliper. The technique us ed in this study is the spraying technique on the sample with a st orage time of 10 minutes. Results and discussion: This 25% betel leaf de coction (infusion) can be used as an alternative to disinfecting alginate impressions because there is no difference in effect between spraying 25% betel leaf decoction (infusion) and 0.2% chlorhexidine on alginate molds on changes in model physiological dimen- sions. Conclusion: the dimensional changes that occur are still within tolera- ble limits in alginate molds which were disinfected by spraying 25% betel leaf decoction and 0.2% chlorhexidine solution so that both can be used as disinfection materials for alginate impression materials


2021 ◽  
Vol 22 (1) ◽  
Author(s):  
Gernot Seppel ◽  
Andreas Voss ◽  
Daniel J. H. Henderson ◽  
Simone Waldt ◽  
Bernhard Haller ◽  
...  

Abstract Background While supraspinatus atrophy can be described according to the system of Zanetti or Thomazeau there is still a lack of characterization of isolated subscapularis muscle atrophy. The aim of this study was to describe patterns of muscle atrophy following repair of isolated subscapularis (SSC) tendon. Methods Forty-nine control shoulder MRI scans, without rotator cuff pathology, atrophy or fatty infiltration, were prospectively evaluated and subscapularis diameters as well as cross sectional areas (complete and upper half) were assessed in a standardized oblique sagittal plane. Calculation of the ratio between the upper half of the cross sectional area (CSA) and the total CSA was performed. Eleven MRI scans of patients with subscapularis atrophy following isolated subscapularis tendon tears were analysed and cross sectional area ratio (upper half /total) determined. To guarantee reliable measurement of the CSA and its ratio, bony landmarks were also defined. All parameters were statistically compared for inter-rater reliability, reproducibility and capacity to quantify subscapularis atrophy. Results The mean age in the control group was 49.7 years (± 15.0). The mean cross sectional area (CSA) was 2367.0 mm2 (± 741.4) for the complete subscapularis muscle and 1048.2 mm2 (± 313.3) for the upper half, giving a mean ratio of 0.446 (± 0.046). In the subscapularis repair group the mean age was 56.7 years (± 9.3). With a mean cross sectional area of 1554.7 mm2 (± 419.9) for the complete and of 422.9 mm2 (± 173.6) for the upper half of the subscapularis muscle, giving a mean CSA ratio of 0.269 (± 0.065) which was seen to be significantly lower than that of the control group (p < 0.05). Conclusion Analysis of typical atrophy patterns of the subscapularis muscle demonstrates that the CSA ratio represents a reliable and reproducible assessment tool in quantifying subscapularis atrophy. We propose the classification of subscapularis atrophy as Stage I (mild atrophy) in case of reduction of the cross sectional area ratio < 0.4, Stage II (moderate atrophy) in case of < 0.35 and Stage III (severe atrophy) if < 0.3.


Biology ◽  
2021 ◽  
Vol 10 (5) ◽  
pp. 358
Author(s):  
Javier Aragoneses ◽  
Ana Suárez ◽  
Nansi López-Valverde ◽  
Francisco Martínez-Martínez ◽  
Juan Manuel Aragoneses

The aim of this study was to evaluate the effect of implant surface treatment with carboxyethylphosphonic acid and fibroblast growth factor 2 on the bone–implant interface during the osseointegration period in vivo using an animal model. The present research was carried out in six minipigs, in whose left tibia implants were inserted as follows: eight implants with a standard surface treatment, for the control group, and eight implants with a surface treatment of carboxyethylphosphonic acid and immobilization of FGF-2, for the test group. At 4 weeks after the insertion of the implants, the animals were sacrificed for the histomorphometric analysis of the samples. The means of the results for the implant–bone contact variable (BIC) were 46.39 ± 17.49% for the test group and 34.00 ± 9.92% for the control group; the difference was not statistically significant. For the corrected implant–bone contact variable (BICc), the mean value of the test group was 60.48 ± 18.11%, and that for the control group, 43.08 ± 10.77%; the difference was statistically significant (p-value = 0.035). The new bone formation (BV/TV) showed average results of 27.28 ± 3.88% for the test group and 26.63 ± 7.90% for the control group, meaning that the differences were not statistically significant (p-value = 0.839). Regarding the bone density at the interthread level (BAI/TA), the mean value of the test group was 32.27 ± 6.70%, and that of the control group was 32.91 ± 7.76%, with a p-value of 0.863, while for the peri-implant density (BAP/TA), the mean value of the test group was 44.96 ± 7.55%, and that for the control group was 44.80 ± 8.68%, without a significant difference between the groups. The current research only found a significant difference for the bone–implant contact at the cortical level; therefore, it could be considered that FGF-2 acts on the mineralization of bone tissue. The application of carboxyethylphosphonic acid on the surface of implants can be considered a promising alternative as a biomimetic coating for the immobilization of FGF-2. Despite no differences in the new bone formation around the implants or in the interthread or peri-implant bone density being detected, the biofunctionalization of the implant surface with FGF-2 accelerates the mineralization of the bone–implant interface at the cortical level, thereby reducing the osseointegration period.


2018 ◽  
Vol 7 (2) ◽  
pp. 116
Author(s):  
Budi Darmawan ◽  
Diyah Fatmasari ◽  
Rr. Sri Endang Pujiast

Background: Wet cupping, furthermore mentioned cupping, decreases blood pressures through the level of negative air pressures added by hydrostatics filtration pressure to reinforce the power of fluids filtration in capillaries. However, an appropriate negative air pressure to decrease blood pressure remains an uncertainty.Purpose: This study aimed to analyze negative air pressure differences on cupping in decreasing blood pressures in hypertensive patients.Methods: This is a quasi-experimental design conducted in three Community Health Centers in Langsa City, Aceh, Indonesia. The samples were 36 hypertensive males with age from 45 to 55, who were randomly stratified into two groups with cupping pressures 400 mbar (n=18) as the control group; and 540 mbar (n=18) as the intervention group. The cupping session was performed to each group on T1 (alkahil) point and in the middle line of both shoulders blade points. The systolic blood pressure (SBP) and diastolic blood pressures (DBP) were measured by validated automatic sphygmomanometer. The follow-up periods were one week and two weeks. The data were then analyzed by repeated measures ANOVA.Results: Cupping pressure of 400 mbar decreased the mean of SBP and DPB with a p-value of 0.450 and 0.026, respectively after two weeks of intervention. Meanwhile, cupping pressure of 540 mbar decreased the mean of SBP and DBP with a p-value of 0.006 and 0.057, respectively. Tests of within-subjects resulted in the p-value of 0.250 (SBP) and 0.176 (DBP) after two weeks of intervention. There were no significant differences in SBP and DBP between the intervention group and the control group.Conclusion: The cupping pressure between 400 mbar and 540 mbar could reduce blood pressure; however, the cupping pressure of 540 mbar yielded greater effect in decreasing blood pressure than the 400 mbar. Negative air vacuum pressure loads on cupping to decrease blood pressure should be considered between 400 to 540 mbar, and further studies are needed.


2018 ◽  
Vol 5 (2) ◽  
pp. 121-129
Author(s):  
Siti Khoiroh

Background : Hypertension is a condition of high blood pressure in the arteries that lasted continuously for the long term. Hypertension can be overcome in two ways: pharmacology and non-pharmacology. Pharmacology treatment usually use medicine while one of the ways for non-pharmacology treatment is to consumes apple juice.Research Objective : The aim of this research is to know the effect of apple juice on blood pressure decrease in elderly people with hypertension at Muara Kaman Community Health Center.Methods : The design of this research used quasi experimental design (quasi experiment) with pretest posttest control group design. The sample of the research was hypertensive respondents at Muara Kaman Community Health Center as many as 30 respondents were divided into 2 groups, 15 intervention groups and 15 control groups. The sampling technique used purposive sampling. The research instruments were stethoscope and sphygmomanometer, data analysis using t test dependent and t test independent.Results : There were a significant influence between pretest and posttest of apple juice in the intervention group (P value = 0,000; P <0.005). The mean difference in systolic blood pressure in the intervention group and the control group also had significant differences (P value = 0.002; P <0.05), where as the mean difference in diastolic blood pressure in the intervention group and the control group also had significant differences (P value = 0,039; P <0,05).The Conclusions : The results of this research showed that consumes apple juice gives an effect on the blood pressure of hypertensive patients by consumes regularly.The Suggestions : Nurses and the public can use apple juice as one of the ways to handling to hypertension sufferers besides antihypertensive drugs.


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