scholarly journals An in vitro Comparison of Marginal Accuracy in Temporary Crowns

2013 ◽  
Vol 3 (3) ◽  
pp. 121-126 ◽  
Author(s):  
Fahad Umer ◽  
Samira Adnan ◽  
Farhan Raza Khan
Keyword(s):  
Computer Software ◽  
Marginal Gap ◽  
Luting Cement ◽  
Marginal Discrepancy ◽  
The Mean ◽  
Post Hoc ◽  
To Receive ◽  
Mandibular First Molar ◽  
One Way Anova

ABSTRACT Purpose To compare the marginal accuracy of temporary crowns in vitro, using two autopolymerizing temporary crown materials. Materials and Methods Polyethyl methacrylate and bis-acryl composite were used to make 15 temporary crowns each, on an ivorine mandibular first molar, prepared as to receive a porcelain-fused-to-metal (PFM) crown. Matrices were made of polyvinyl siloxane impressions of a lower typodont arch. After crowns were fabricated, margins of the crowns were trimmed under magnification. Afterwards, margins of prepared tooth and crowns were marked. Each tooth-crown assembly was then observed under microscope (4×). With digital images of each surface, gap between margins of crown and preparation margin was measured in millimeters using computer software, after calibration. Two examiners made the measurements. Independent samples t-test and one-way ANOVA with Bonferroni post hoc analysis were applied to determine the mean marginal gap. Results Bis-acryl composite crowns exhibited 0.2 mm (SD ± 0.11) mean gap with greatest discrepancy at buccal margins. Mean gap with polyethyl methacrylate crowns was 0.3 mm (SD ± 0.17) with buccal and mesial margins exhibiting the greatest marginal discrepancy, at α <0.001. Conclusion Both materials did not exhibit ideal marginal accuracy, but temporary luting cement film thickness would compensate for the gap observed in the margins of bis-acryl composite crowns. How to cite this article Adnan S, Khan FR, Umer F. An in vitro Comparison of Marginal Accuracy in Temporary Crowns. J Contemp Dent 2013;3(3):121-126.

scholarly journals The influence of different screw tightening forces on the vertical misfit of implant-supported frameworks

2005 ◽  
Vol 13 (2) ◽  
pp. 120-125 ◽  
Author(s):  
Diego Klee de Vasconcellos ◽  
Marco Antonio Bottino ◽  
Renato Sussumu Nishioka ◽  
Luiz Felipe Valandro ◽  
Elza Maria Valadares da Costa
Keyword(s):  
Repeated Measures ◽  
In Vitro Study ◽  
Pairwise Comparisons ◽  
Tukey Test ◽  
Nickel Chromium ◽  
Marginal Discrepancy ◽  
The Mean ◽  
Post Hoc ◽  
One Way Anova

OBJECTIVES: The present in vitro study was designed to compare the differences in the vertical misfit of implant-supported frameworks using three different forces for tightening the bridge locking screws: fastening by hand until first resistance, and using torque drivers with 10 and 20Ncm. METHODS: The investigation was conducted based on the results given by 9 six-unit nickel-chromium (2 abutments/ 4 pontics) screw-retained implant-supported frameworks. The structures were exposed to simulated porcelain firings. The marginal misfit measurements were made using a traveling measuring microscope at selected screw tightening forces: fastening by hand until first resistance, and using torque drivers with 10 and 20Ncm. The results were submitted to one-way ANOVA with repeated measures on one factor, and post hoc pairwise comparisons using Tukey test (5%). RESULTS: The mean marginal misfit of the frameworks, fastening the screws by hand until first resistance, was 41.56µm (SD±12.45µm). The use of torque driver devices caused a significant reduction in marginal opening (p<0.05). With the lowest torque available (10Ncm), the mean marginal discrepancy at the abutment-framework interface was reduced an average of 52% to a mean marginal opening of 19.71µm (SD±2.97µm). After the use of the 20Ncm torque driver, the mean marginal discrepancy of the frameworks was reduced an average of 69% to a mean marginal opening of 12.82µm (SD±4.0µm). Comparing the use of torque drivers with 10 and 20 Ncm torque, the means are not significantly different from one another. CONCLUSION: The seating force has an important effect on the vertical misfit measurements, once it may considerably narrow the vertical misfit gaps at the abutment-framework interface, thus leading to a misjudgment of the real marginal situation.

scholarly journals Effect of digital workflow on the marginal fit of long-span implant-supported bars for kennedy ii class removable prostheses in vitro

2021 ◽  
Vol 8 (1) ◽  
pp. 33-44
Author(s):  
Aristeidis Villias ◽  
◽  
Triantafillos Papadopoulos ◽  
Nikolaos Polychronakis ◽  
Hercules Karkazis ◽  
...  
Keyword(s):  
Laboratory Study ◽  
Descriptive Statistics ◽  
Digital Workflow ◽  
Marginal Fit ◽  
Long Span ◽  
Impression Technique ◽  
Marginal Discrepancy ◽  
Post Hoc ◽  
One Way Anova

Introduction The production procedures, including impressions, introduce errors affecting the passivity of fit. A completely digital workflow is possible nowadays because of the intraoral scanners (IOS). This study aimed to evaluate the effect of the impression technique (conventional versus digital) and the screw tightening sequence on the marginal discrepancy (MD) of implant-supported bars. Methodology This laboratory study was conducted on a simulated Kennedy class II edentulous maxilla with three parallel implants in the edentulous quartile. The closed tray technique with a-silicon (CTM) and the intraoral scanning with the I-Tero™ system (IOS) were compared and three bars were manufactured from each technique. Depending on the screw tightening sequence (A11 and A17) 4 groups were created with 6 samples each. The MD was examined implementing 24 negative replicas, which were sectioned and studied under a stereomicroscope. The Horizontal Discrepancy (BHD), Vertical Discrepancy (BVD) and Conical Discrepancy (BCD) of the bar were calculated on the means of the measurements of the horizontal, the vertical and the conical MD respectively. The descriptive statistics, normality tests, one-way ANOVA (a=.05) and post-hoc Tukey’s tests were run and the graphs were draw with SPSS. Results There was a significant effect (P<.05) of the impression technique combined with the screw tightening sequence on all variables. The post-hoc Tukey’s tests revealed significant differences between all groups except from those of the same impression technique only for the BHD (P<.05). Conclusion In this study all groups resulted in marginal discrepancies. The closed tray impression technique gave better results.

scholarly journals Depth-Related Curing Potential of Ormocer- and Dimethacrylate-Based Bulk-Fill Composites

Materials ◽  
2021 ◽  
Vol 14 (22) ◽  
pp. 6753
Author(s):  
Ramona S. Oltramare ◽  
Reto Odermatt ◽  
Phoebe Burrer ◽  
Thomas Attin ◽  
Tobias T. Tauböck
Keyword(s):  
Double Bond ◽  
Repeated Measures ◽  
In Vitro Study ◽  
High Viscosity ◽  
Degree Of Conversion ◽  
Double Bond Conversion ◽  
Nanohybrid Composite ◽  
Post Hoc ◽  
One Way Anova

The aim of this in vitro study was to investigate the degree of C=C double bond conversion of high-viscosity dimethacrylate- or ormocer-based bulk-fill composites as a function of measurement depth. Four bulk-fill composites (Tetric EvoCeram Bulk Fill, x-tra fil, SonicFill, and Bulk Ormocer) and the conventional nanohybrid composite Tetric EvoCeram were applied in standardized Class II cavities (n = 6 per group) and photoactivated for 20 s at 1350 mW/cm2. The degree of conversion of the composites was assessed using Fourier-transform infrared spectroscopy at seven measurement depths (0.15, 1, 2, 3, 4, 5, 6 mm). Data were analyzed using repeated measures ANOVA and one-way ANOVA with Bonferroni post-hoc tests (α = 0.05). The investigated bulk-fill composites showed at least 80% of their maximum degree of conversion (80% DCmax) up to a measuring depth of at least 4 mm. Tetric EvoCeram Bulk Fill and Bulk Ormocer achieved more than 80% DCmax up to a measuring depth of 5 mm, x-tra fil up to 6 mm. The conventional nanohybrid composite Tetric EvoCeram achieved more than 80% DCmax up to 3 mm. In contrast to the conventional composite, the investigated ormocer- and dimethacrylate-based bulk-fill composites can be photo-polymerized in thick layers of up to at least 4 mm with regard to their degree of C=C double bond conversion.

scholarly journals Antibiofilm Effect of Clitoria ternatea Flower Juice on Porphyromonas gingivalis in vitro

2018 ◽  
Vol 1 (1) ◽  
Author(s):  
Armelia Sari Widyarman ◽  
Stephani Sumadi ◽  
Tri Putriany Agustin
Keyword(s):  
Porphyromonas Gingivalis ◽  
Incubation Time ◽  
Laboratory Research ◽  
Assay Method ◽  
Blue Color ◽  
Clitoria Ternatea ◽  
Anova Test ◽  
Post Hoc ◽  
One Way Anova

  Introduction: Clitoria ternatea flower contains flavonoid such as anthocyanin that gives the blue color to its flower and has antimicrobial activity.   Objectives: The aim of this study was to examine the effect of flower juice of Clitoria ternatea against Porphyromonas gingivalis biofilm viability in vitro.   Methods: This study was experimental laboratory research using biofilm assay method. P. gingivalis was cultured in BHI broth in 37°C for 24h under anaerobic condition. Fresh flowers of Clitoria ternatea were extracted using mortar and pestle and diluted into 6 different concentrations: 100%, 50%, 25%, 12.5%, 6.25%, and 3.125% with phosphate buffer saline (PBS). Chlorhexidine (0.2%) was used as positive control and biofilm without treatment as negative control. The flower juice was distributed into 96 well-plates that contained biofilm of P. gingivalis and incubated for 1h, 3h, 6h, and 24h in 37°C, anaerobic atmosphere. Biofilm was measured using crystal violet dye with microplate reader (490 nm). Data were statistically analysed using one-way ANOVA test and Post Hoc test with p<0.05 was set as significant different.   Result: Result showed that Clitoria ternatea flower juice significantly reduced the Porphyromonas gingivalis biofilm viability in all concentration and all incubation time. The most effective concentration to inhibit Porphyromonas gingivalis biofilm was 100% in 1h incubation time which biofilm was diminished (Optical Density=0.00). One way ANOVA test and Post Hoc test showed a significant biofilm reduction in all concentration and all incubation time after treatment with the flower juice compared to control (p<0.05).   Conclusion: Clitoria ternatea flower juice has antibiofilm effect against Porphyromonas gingivalis. This result showed this flower juice may be useful for combating periodontal pathogens. However, further studies using other bacteria are still needed to confirm this result.

scholarly journals EFEK ANTIBAKTERI EKSTRAK DAUN MIMBA (Azadirachta indica) TERHADAP PERTUMBUHAN Enterococcus faecalis SECARA IN-VITRO

2019 ◽  
Vol 11 (1) ◽  
pp. 23-32
Author(s):  
Cut Soraya ◽  
Sunnati ◽  
Fenny Wulandari
Keyword(s):  
Phenolic Compound ◽  
Enterococcus Faecalis ◽  
Azadirachta Indica ◽  
Control Group ◽  
Post Hoc ◽  
One Way Anova ◽  
Banda Aceh

Perawatan saluran akar adalah perawatan yang dilakukan untuk mempertahankan gigi agar dapatberfungsi di lengkung gigi selama mungkin. Penyebab dominan dari kegagalan perawatan endodontikadalah adanya bakteri di dalam saluran akar. Bakteri yang paling sering ditemukan pada isolasi darigigi yang mengalami kegagalan perawatan saluran akar adalah Enterococcus faecalis (E.faecalis).Salah satu jenis tanaman herbal yang memiliki sifat antibakteri yang tinggi adalah tanaman mimba(A.indica). Tujuan penelitian ini untuk menganalisis efek antibakteri ekstrak daun mimba (A.indica)terhadap pertumbuhan E. faecalis. Penelitian ini merupakan penelitian eksperimental laboratorisdengan desain penelitian true experimental posttest only control group. Penelitian dilalukan denganmenguji ekstrak daun mimba (A.indica) pada konsentrasi 10%, 20%, 40%, 60%, 80% dan 100%terhadap pertumbuhan E. faecalis yang dilakukan di Laboratorium Mikrobiologi Fakultas KedokteranHewan (FKH) Universitas Syiah Kuala Banda Aceh. Hasil uji fitokimia yang dilakukan menunjukkanbahwa ekstrak daun mimba (A. indica) positif mengandung triterpenoid, phenolic compound, tanin,steroid dan saponin yang berperan sebagai antibakteri. Hasil uji efek antibakteri ekstrak daun mimba(A. indica) menunjukkan adanya pembentukan zona hambat di sekitar kertas cakram pada setiapkonsentrasi. Hal ini membuktikan bahwa ekstrak daun mimba memiliki efek antibakteri yangmemiliki kemampuan dalam menghambat pertumbuhan E. faecalis. Uji statistik digunakanmenggunakan one way ANOVA. Kemudian dilakukan uji lanjut (Post hoc test) menggunakan LeastSignificant Difference untuk menganalisis perbedaan efek antibakteri ekstrak daun mimba (A. indica)dalam konsentrasi 10%, 20%, 40%, 60%, 80% dan 100% terhadap pertumbuhan E.faecalis.Kesimpulan penelitian ini ekstrak daun mimba (A. indica) berpotensi menghambatpertumbuhan E. faecalis.Kata Kunci: Azadirachta indica, Enterococcus faecalis, perawatan saluran akar.

scholarly journals In Vitro Re-Hardening of Bleached Enamel Using Mineralizing Pastes: Toward Preventing Bacterial Colonization

Materials ◽  
2020 ◽  
Vol 13 (4) ◽  
pp. 818 ◽  
Author(s):  
Andrea Scribante ◽  
Claudio Poggio ◽  
Simone Gallo ◽  
Paolo Riva ◽  
Antonella Cuocci ◽  
...  
Keyword(s):  
Bacterial Colonization ◽  
Micro Hardness ◽  
Home Agent ◽  
Vickers Hardness Number ◽  
Hardness Tester ◽  
Post Hoc ◽  
To Receive ◽  
Hardness Values ◽  
At Home

The search for materials able to remineralize human hard tissues is a modern medical challenge. In this study, the protective effect on the enamel microhardness by a paste based on hydroxyapatite and sodium fluoride (Remin Pro) was evaluated after two different enamel bleaching procedures. Forty sound human incisors were randomly assigned to different treatments: bleaching with an in-office agent (Perfect Bleach Office+); bleaching with an at-home agent (Perfect Bleach); bleaching with the in-office agent followed by the prophylaxis paste; bleaching with the at-home agent followed by the prophylaxis paste; no treatment (control). Bleaching was performed at 0, 8, 24 and 32 h, followed by a 3-min re-mineralizing treatment in the subgroups designed to receive it. Specimens underwent a micro-hardness tester and a mean Vickers Hardness number was considered for each specimen. ANOVA exhibited significant differences among groups. Post-hoc Tukey testing showed significant micro-hardness decrease after the application of both the two bleaching agents. The treatment with prophylaxis paste significantly increased the micro-hardness values of bleached enamel.

scholarly journals Examining the Associations between Oases Soundscape Components and Walking Speed: Correlation or Causation?

2020 ◽  
Vol 12 (11) ◽  
pp. 4619
Author(s):  
Djihed Berkouk ◽  
Tallal Abdel Karim Bouzir ◽  
Luigi Maffei ◽  
Massimiliano Masullo
Keyword(s):  
Walking Speed ◽  
Significant Negative Correlation ◽  
Urban Settlements ◽  
Spearman Correlation Test ◽  
The Mean ◽  
Mode Of Transport ◽  
Post Hoc ◽  
One Way Anova

The feeling of calm and tranquillity provided by the oases of Algeria can disappear because of the outdated urbanization strategy which is based on the vehicle as a mode of transport. Walkability is one of the most adoptable sustainable strategies to reduce the negative mechanical transportation effects on the quality of life. This paper aimed to examine the correlation and the causation between oases soundscape components and walking speed. The methodology of this field study was based on an empirical approach at the urban settlements in three oases in Algeria. The correlation between walking speed and soundscape components was obtained through the use of the Spearman correlation test. A one-way ANOVA analysis was conducted to assess the effect of the soundscape components on walking speed. A post hoc Tukey test was adopted to explore the sound component that causes increased walking speed. In this study, no significant correlation was explored between the walking speed and the anthrophonical sounds. In contrast, the statistical analysis of the sound walks experience suggests a moderate and significant negative correlation between geophonical and biophonical sounds, with mean walking speed. The results showed that, the cause of the increase in the mean walking speed of the pedestrians is human sound. The findings suggest that further research is needed to focus on the long-term subjective investigation to explore the correlations and the effects between soundscape, walkability and walking speed.

In Vitro Evaluation of Microleakage and Microhardness of Ethanolic Extracts of Propolis in Different Proportions Added to Glass Ionomer Cement

2016 ◽  
Vol 40 (2) ◽  
pp. 136-140 ◽  
Author(s):  
Mustafa Altunsoy ◽  
Mehmet Tanrıver ◽  
Uğur Türkan ◽  
Mehmet Emin Uslu ◽  
Sibel Silici
Keyword(s):  
Glass Ionomer Cement ◽  
Antibacterial Properties ◽  
Dental Practice ◽  
Glass Ionomer ◽  
Tukey Test ◽  
Ethanolic Extracts ◽  
Post Hoc ◽  
One Way Anova ◽  
Ionomer Cement

Objective: To evaluate the effect of ethanolic extracts of propolis (EEP) addition in different proportions to glass ionomer cement (GIC) on microleakage and microhardness of GIC. Study design: The cement was divided into four groups: one using the original composition and three with 10%, 25%, and 50% EEP added to the liquid and then manipulated. For microleakage assessment, sixty primary molars were randomly divided into four groups (n=15). Standard Class II cavities were prepared and then filled with EEP in different proportions added to GICs. Microleakage test was performed using a dye penetration method. The data were analyzed using one-way ANOVA and Mann - Whitney U tests (α = 0.05). Disc shaped specimens were prepared from the tested GIC to determine Vickers hardness (VHN). The data were analyzed using one-way ANOVA and post hoc Tukey test (α = 0.05). Results: There were no statistically significant differences between the groups in terms of microleakage (p &gt; 0.05). There were statistically significant differences between the VHN values of groups (p &lt; 0.05). Increasing addition of EEP to GIC statistically significantly increased VHN value of GIC (p &lt; 0.05). Conclusions: The addition of EEP to GIC increased the microhardness of the GIC and did not adversely affect the microleakage. Thus, it might be used during routine dental practice due to its antibacterial properties

scholarly journals UJI EFEK ANTI BAKTERI EKSTRAK BUNGA CENGKEH TERHADAP BAKTERI Streptococcus mutans SECARA IN VITRO

e-GIGI ◽  
2014 ◽  
Vol 2 (2) ◽  
Author(s):  
Juvensius R. Andries ◽  
Paulina N. Gunawan ◽  
Aurelia Supit
Keyword(s):  
Streptococcus Mutans ◽  
Control Group ◽  
Antibacterial Effects ◽  
Control Group Design ◽  
Group Design ◽  
Post Test ◽  
Clove Extract ◽  
Post Hoc ◽  
One Way Anova

Abstrak: Minyak cengkeh berguna sebagai antibakteri alami. Minyak esensial dari cengkeh mempunyai fungsi anestetik dan antimikrobial. Zat yang terkandung dalam cengkeh yang bernama eugenol dapat membunuh bakteri termasuk bakteri yang resisten terhadap antibiotika, salah satunya adalah bakteri Streptococcus mutans. Bakteri ini merupakan mikroorganisme penyebab utama terjadinya karies. Tujuan dari penelitian ini yaitu untuk mengetahui efek antibakteri ekstrak cengkeh terhadap bakteri Streptococcus mutans secara in vitro. Penelitian ini merupakan penelitian eksperimental menggunakan post test only control group design. Penelitian ini menggunakan bahan coba ekstrak cengkeh dengan konsentrasi 40%, 60%, dan 80%, Ciprofloxacin, aquades dengan pengulangan sebanyak lima kali. Data dikumpulkan dan dianalisis dengan one-way ANOVA dan post-hoc uji LSD ( = 0,05). Berdasarkan hasil uji statistik penelitian uji efek antibakteri ekstrak cengkeh terhadap bakteri streptococcus mutans secara in vitro, dapat disimpulkaan bahwa ekstrak cengkeh memiliki efek antibakteri dalam menghambat pertumbuhan bakteri Streptococcus mutans secara in vitro. Hasil uji lanjut post-hoc uji LSD menunjukan daya hambat ekstrak cengkeh 40%, 60%, 80%, lebih kecil (p<0,05) dalam menghambat Streptococcus mutans secara in vitro dibandingkan Ciprofloxacin. Kata Kunci: Ekstrak cengkeh, Streptococcus mutans.   Abstract: Clove oil is useful as a natural antibacterial agent, essential oil of clove has anesthetic and antimicrobial effect. Substances contained in clove called eugenol can kill bacteria including antibiotic resistant bacteria, one of which is the bacteria Streptococcus mutans. This bacteria is a major cause for caries. The purpose of this study was to mengetahui clove extrack antibacterial effects againts Streptococcus mutans bacteria in vitro. This study is an experimental study using a post test only control group design. This research try using clove extract with a concentration of 40%, 60%, and 80%, Ciprofloxacin, aquades repetition five times. Data collected and analyzed by one-way ANOVA and post-hoc LSD test (α = 0.05). Based on the results of the statistical test to test the effects of anti-bacterial research clove extracts against Streptococcus mutans bacteria in vitro, can disimpulkaan that clove extracts have antibacterial effects in inhibiting the growth of Streptococcus mutans bacteria in vitro.further test result post-hoc LSD test shoved its inhibitory clove extract 40%, 60%, 80% smaller (p<0,05)in hibiting Streptococcus mutans in vitro compared Ciprofloxacin. Keywords: clove extract, Streptococcus mutans

scholarly journals Marginal Fit of Temporary Restorations Fabricated by the Conventional Chairside Method, 3D Printing, and Milling

2021 ◽  
Author(s):  
Mahsa Mohajeri ◽  
Sara Khazaei ◽  
Fariborz Vafaee ◽  
Farnaz Firouz ◽  
Somayeh Ghorbani Gholiabad ◽  
...  
Keyword(s):  
3D Printing ◽  
Acrylic Resin ◽  
Marginal Gap ◽  
Canine Tooth ◽  
Marginal Fit ◽  
Implant Abutment ◽  
The Mean ◽  
The Difference ◽  
Gap Data

Objectives: This study aimed to compare the marginal fit of temporary restorations fabricated by the conventional chairside method, 3D printing, and milling. Materials and Methods: In this in vitro, experimental study, 14 temporary restorations were conventionally fabricated over an implant abutment and analog that had been mounted in a phantom model at the site of canine tooth, using auto-polymerizing acrylic resin and putty index. In digital manufacturing, the original model was scanned, and the final restoration was designed. Fourteen temporary restorations were milled out of polymethyl methacrylate (PMMA) blocks, and 14 others were printed by a 3D printer. Temporary crowns were placed on the abutment, and images were obtained from specific areas under a stereomicroscope at x100 magnification to measure the amount of marginal gap. Data were analyzed using one-way ANOVA and Tukey’s test (α=0.05). Results: The mean marginal gap values for the temporary crowns in the 3D printing, milling, and chairside groups were 91.40, 75.28 and 51.23 µm, respectively. The crowns that were conventionally fabricated chairside exhibited the lowest marginal gap, and the difference in this respect was significant among the three groups (P<0.05). Conclusion: Temporary crowns fabricated by the chairside method showed significantly smaller marginal gap; however, the marginal gap of all three groups was within the clinically acceptable range.

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