scholarly journals Comparative Evaluation of Newer Remineralizing Agents on Surface Characteristics of Tooth Surface After Slenderization: An In Vitro Study

2020 ◽  
pp. 030157422096570
Author(s):  
Renu Nanwal ◽  
Seema Gupta ◽  
Eenal Bhambri ◽  
Sachin Ahuja ◽  
Ridhi Kothari
Keyword(s):  
Vickers Microhardness ◽  
In Vitro Study ◽  
Surface Characteristics ◽  
Tooth Surface ◽  
Maximum Increase ◽  
Edx Analysis ◽  
Significant Difference ◽  
Tukey Honestly Significant Difference ◽  
Group 5

Aim: The aim of the present study was to compare the effects of remineralizing agents (nano-hydroxyapatite [n-HAP], NovaMin, calcium sucrose phosphate [CaSP], and Pro-Argin) on surface characteristics of slenderized enamel using Vickers microhardness and scanning electron microscope–energy dispersive X-ray (SEM-EDX) analysis. Materials and Method: Sixty extracted premolar teeth were divided into 6 groups: group 1—natural teeth; group 2—slenderization and polishing; group 3—n-HAP; group 4—NovaMin; group 5—CaSP; and group 6—Pro-Argin. Remineralizing agents were applied for 21 days. Specimens were evaluated using Vickers microhardness and SEM-EDX analysis. A 1-way analysis of variance (ANOVA) and post-hoc Tukey honestly significant difference (HSD) test were used for intragroup comparisons. Results: Among all remineralizing agents, CaSP showed significantly maximum surface microhardness, followed by NovaMin, n-HAP, and Pro-Argin. SEM also showed increased surface roughness for all remineralizing agents. EDX showed maximum increase in mineral content obtained with CaSP. Conclusion: All remineralizing agents significantly remineralized the stripped enamel surface. CaSP demonstrated promising results by effectively and significantly remineralizing the enamel lesions as compared to other test agents.

scholarly journals Comparison of Shear Bond Strength and Microleakage of Various Bulk-fill Bioactive Dentin substitutes: An in vitro Study

2016 ◽  
Vol 17 (12) ◽  
pp. 997-1002 ◽  
Author(s):  
Fahad I Alkhudhairy ◽  
Zeeshan H Ahmad
Keyword(s):  
Bond Strength ◽  
Shear Bond Strength ◽  
Physical And Mechanical Properties ◽  
Pairwise Comparison ◽  
In Vitro Study ◽  
Composite Resins ◽  
Intergroup Comparison ◽  
Significant Difference ◽  
Tukey Honestly Significant Difference

ABSTRACT Introduction Various bulk-fill materials depending on their composition, viscosity, and flow ability have different physical and mechanical properties. The aim of this in vitro study was to determine and compare the shear bond strength and microleakage properties of activa restorative with other bulk-fill restorative materials surefil (SDR), Biodentine, ever X posterior. Materials and methods Forty permanent premolars were selected for shear bond strength, and 20 permanent premolars were selected with class II cavities on mesial and distal side for microleakage. Universal testing device was used to assess the shear bond strength. Microleakage was checked using dye penetration method under a stereomicroscope. Mean and standard deviation values were calculated from the recorded values. Intergroup comparison was done by one-way analysis of variance (ANOVA) followed by pairwise comparison using Tukey honestly significant difference (HSD) post hoc test. Results The mean shear bond strength was highest for SDR surefil followed by Ever X posterior, Bioactive restorative, and Biodentine respectively. In this study, SDR (surefil) showed better shear bond strength and better microleakage properties compared with the other test materials (F = 186.7157, p < 0.05). Conclusion The result of this study showed that flowable and fiber-reinforced composites have better shear bond strength and microleakage properties. Clinical significance Flowable bulk-fill composite resins can be used as dentin substitutes because of its superior properties. How to cite this article Alkhudhairy FI, Ahmad ZH. Comparison of Shear Bond Strength and Microleakage of Various Bulk-fill Bioactive Dentin substitutes: An in vitro study. J Contemp Dent Pract 2016;17(12):997-1002.

scholarly journals Comparative Evaluation of Dimensional Accuracy, Surface Characteristics, and Load Deflection Attributes of 0.019" × 0.025" Stainless Steel Wires Sourced from Six Different Commercial Houses: An In Vitro Study

2020 ◽  
Vol 54 (4) ◽  
pp. 311-320
Author(s):  
Neeraj E Kolge ◽  
Vivek J Patni ◽  
Girish Karandikar ◽  
Ravindranath VK ◽  
Prateek Daga ◽  
...  
Keyword(s):  
In Vitro Study ◽  
Frictional Resistance ◽  
Dimensional Accuracy ◽  
Surface Characteristics ◽  
Steel Wires ◽  
Group 5 ◽  
Group 2 ◽  
Deflection Rate ◽  
Group 1

Aims & Objectives: The aim of the study was to evaluate and compare dimensional accuracy, surface characteristics and load deflection attributes of SS wires sourced from six different commercial houses. Materials & Methods: 0.019” x 0.025” SS wire samples were divided into 6 groups and evaluated and compared for the aforementioned properties. Dimensional accuracy, surface roughness, frictional resistance, load deflection rate and ultimate tensile strength were evaluated and compared. Results: Dimensional accuracy did not vary significantly. Surface Profilometry proved 3M Unitek (Group 1) to be the wire with least irregularities. According to SEM, Modern Orthodontics (Group 6) and 3M Unitek (Group 1) in terms of ‘Sa’ and ‘Sq’ respectively had the smoothest surface finish. SS wires sourced from G&H Orthodontics (Group 2) exhibited least frictional resistance. Load deflection rates varied for all the groups for all three parameters under the study. UTS was best for SS wires sourced from Rabbit Force Orthodontics (Group 5). Conclusion: No wire from a single commercial house excels in all the parameters that were evaluated, each one having its aces and minuses.

scholarly journals Influence of Oscillating Packing Instrument on Microhardness of Bulk-Fill Composite: In Vitro Study

2020 ◽  
Vol 8 (D) ◽  
pp. 146-149
Author(s):  
Emad Mohamed Bayoumi ◽  
Mohamed Farid Riad ◽  
Mohamed Mostafa Zayed ◽  
Mostafa Abou Shelib ◽  
Ahmed Mohamed Bayoumi ◽  
...  
Keyword(s):  
Vickers Microhardness ◽  
In Vitro Study ◽  
Vitro Study ◽  
Significant Difference

AIM: This study aimed to assess Vickers microhardness of Tetric EvoCeram Bulk Fill composite that was packed manually and using oscillating packing device. MATERIALS AND METHODS: Two different packing techniques were applied on Tetric EvoCeram Bulk Fill composite. For each packing technique, ten specimens (6 mm in diameter and 4 mm height) were prepared using a black-shaded Teflon mold. The resin was inserted in a bulk increment either packed manually or using Compothixo oscillating device and then light-cured for 40 s. Microhardness was analyzed at the top and the bottom surfaces. RESULTS: Overall, for both packing techniques, microhardness decreased significantly with the increase of depth. Tetric EvoCeram Bulk Fill composite when packed either manually or using oscillating device, did not show significant difference neither at the top surfaces of both applied techniques nor at the bottom surfaces of both applied techniques. CONCLUSION: Different packing techniques did not influence the microhardness of Tetric EvoCeram Bulk Fill composite.  

scholarly journals Evaluation of dentinal defects during root canal preparation using thermomechanically processed nickel-titanium files

2017 ◽  
Vol 11 (02) ◽  
pp. 157-161 ◽  
Author(s):  
Bertan Kesim ◽  
Burak Sagsen ◽  
Tugrul Aslan
Keyword(s):  
Root Canal ◽  
In Vitro Study ◽  
Nickel Titanium ◽  
Rotary Motion ◽  
Control Group ◽  
Continuous Rotation ◽  
Significant Difference ◽  
Group 5 ◽  
Group 2

ABSTRACT Objective: The aim of this study was to compare the incidence of root cracks after root canal instrumentation with thermomechanically processed nickel-titanium (Ni-Ti) files with different instrumentation kinematics. Materials and Methods: A total of 150 extracted mandibular premolars with mature apices and straight root canals were divided into five groups and used in this study. In Group 1, 30 teeth were prepared using hand K-files and assigned to control group, Group 2 was instrumented using K3XF Rotary files (SybronEndo, Glendora, CA, USA) with continuous rotary motion. The teeth in Group 3 were instrumented by ProTaper Next (Dentsply Maillefer, Ballaigues, Switzerland) rotary files which make asymmetric rotary motion, In Group 4, teeth were instrumented by RECIPROC (VDW, Munich, Germany) with reciprocation motion and in Group 5, teeth were instrumented by Twisted File (TF) Adaptive (SybronEndo, Orange, CA, USA) files that use combination of continuous rotation and reciprocation motion (n = 30/per group). All the roots were horizontally sectioned 3, 6, and 9 mm from the apex with a low speed saw under water cooling. Then, the slices were examined through a stereomicroscope to determine the presence of dentinal microcracks.Results: For the apical (3-mm) and coronal (9-mm) sections, the ProTaper Next and TF Adaptive produced significantly more cracks than the hand files, RECIPROC, and K3XF (P < 0.05). There was no significant difference between the experimental groups and control group at the 6-mm level (P > 0.05). Conclusions: Within the limitations of this in vitro study, all thermal-treated Ni-Ti instruments and hand files caused microcracks in root canal dentin.

scholarly journals Indirect versus Direct Bonding—A Shear Bond Strength Comparison: An in vitro Study

2011 ◽  
Vol 12 (4) ◽  
pp. 232-238 ◽  
Author(s):  
Vinaya S Pai ◽  
S Nandini ◽  
M Swetha ◽  
N Sanjay
Keyword(s):  
Bond Strength ◽  
Shear Bond Strength ◽  
In Vitro Study ◽  
Adhesive System ◽  
Vitro Study ◽  
Tooth Surface ◽  
Indirect Bonding ◽  
Significant Difference ◽  
Bonding Technique

ABSTRACT Aim The process of bonding orthodontic appliances to the enamel surface of the teeth has come to the forefront as a major improvement in bonding techniques. The purpose of this study is to compare the shear bond strength of stainless steel orthodontic brackets bonded using conventional direct bonding and indirect bonding as described by Thomas. Materials and methods Forty sound human premolars were divided into two groups of 20 each. Group I samples were bonded directly on the tooth surface using concise two paste adhesive system after etching and drying. Group II samples were bonded indirectly on the tooth surface according to Thomas indirect bonding technique using concise two paste adhesive system. The stored specimen was tested for shear bond strength in an Instron universal testing machine at a crosshead speed of 0.5 mm/minute. Data obtained were subjected to statistical analysis. Results The results showed that there was no statistically significant difference in the shear bond strength between direct and indirect bonding techniques. Chi-square test showed that there were significant differences among the adhesive remnant index scores between direct and indirect bonding groups. Conclusion In vitro shear bond strength comparison between direct and indirect-bonded attachments showed no significant difference between the two groups. Bond strength obtained with Thomas indirect bonding technique was comparable with direct bonding technique. Clinical significance Thomas indirect bonding technique can be used for bonding of the posterior teeth, where the risk of moisture contamination is high during bonding. How to cite this article Swetha M, Pai VS, Sanjay N, Nandini S. Indirect versus Direct Bonding—A Shear Bond Strength Comparison: An in vitro Study. J Contemp Dent Pract 2011; 12(4):232-238.

scholarly journals Optical and Surface Properties of Monolithic Zirconia after Simulated Toothbrushing

Materials ◽  
2019 ◽  
Vol 12 (7) ◽  
pp. 1158 ◽  
Author(s):  
Jae-Hyun Lee ◽  
Sung-Hun Kim ◽  
Jung-Suk Han ◽  
In-Sung Luke Yeo ◽  
Hyung-In Yoon
Keyword(s):  
Surface Roughness ◽  
Repeated Measures ◽  
In Vitro Study ◽  
Surface Characteristics ◽  
Intergroup Comparison ◽  
Significant Difference ◽  
Monolithic Zirconia ◽  
The Impact ◽  
Surface Gloss

This in vitro study investigated the impact of various dentifrices on the shade, translucency, gloss, and surface characteristics of polishing- or glazing-finished monolithic zirconia surfaces after simulated toothbrushing. Eighty square-shaped monolithic zirconia specimens were divided into two major groups based on the finishing methods—polished (P) and glazed (G). Next, specimens from the two major groups were categorized into four subgroups: stored in distilled water (DW, control); brushed with a fluoride-free conventional dentifrice (C); brushed with a fluoride dentifrice (F); and brushed with a whitening dentifrice (W). Overall, eight groups were created—PDW, PC, PF, PW, GDW, GC, GF, and GW (n = 10 each). Shade, translucency, surface gloss, surface roughness, crystalline phase, and superficial topography data were obtained. Repeated-measures ANOVA and two-way ANOVA were used for intergroup comparison (all α = 0.05). The color differences (ΔE00) between pre- and posttreatment were 0.3158 (PDW), 0.7164 (PC), 0.7498 (PF), 0.8106 (PW), 0.1953 (GDW), 0.301 (GC), 0.3051 (GF), and 0.4846 (GW). A statistically significant difference was observed among the ΔE00, surface gloss, and surface roughness of monolithic zirconia. Thus, brushing with several dentifrices markedly affects the optical properties and surface characteristics of monolithic zirconia finished with polishing or glazing methods.

scholarly journals INFLUENCE OF DIFFERENT BLEACHING SYSTEMS ON THE BOND STRENGTH OF LAMINATE VENEER TO ENAMEL

2018 ◽  
Vol 4 (2) ◽  
pp. 1-6
Author(s):  
Ozgun Yusuf Ozyilmaz ◽  
Filiz Aykent ◽  
Ali Riza Tuncdemir ◽  
Haluk Baris Kara
Keyword(s):  
Bond Strength ◽  
Diode Laser ◽  
In Vitro Study ◽  
Unit Group ◽  
Tooth Surface ◽  
Control Group ◽  
Significant Difference ◽  
And Control ◽  
One Way Anova

Purpose: The objective of this in-vitro study was to examine the microtensile bond strength of a porcelain laminate veneer (PLV)  to tooth surface bleached with photoactivation by blue light-emitting diode (LED) or diode laser. Methods: Eigthteen extracted human central incisors were randomly divided into three groups. Two sticks were obtained from each tooth (n=12). Before surface treatments; teeth were prepared to provide space for PLVs. The first group teeth were bleached with Whiteness HP  which is contain 35% hydrogen peroxide (HP) and then photoactivated with  a LED for 20 seconds. The second  group were bleached with Laserwhite 20  which is contain 46% HP and  photoactivated with a diode laser for 30 seconds. The third group received no surface treatment and served as the control group. IPS Esthetic ceramic veneers were luted with Variolink II veneer cement . The teeth were sectioned to obtain porcelain-resin-enamel/dentin sticks and submitted to a MTB testing device. The maximum load at fracture  was recorded. Data were analyzed using one-way ANOVA followed by the Tukey HSD post-hoc test at a preset  α of  0.05. Results: One-way ANOVA revealed that there was significant difference between LED unit group and control group (p<.05) but  no statistical differences were observed with diode laser group (p>.05)  The LED unit group presented significantly lower bond strength value (6.49±2.3 MPa) than diode laser (8.49±3.1 MPa) and control groups (9.53±2.7 MPa). Conclusion: The results suggested that bleaching therapy with activation by LED or diode laser reduced the bond strength of IPS Esthetic ceramic veneers to tooth surfaces.Keywords: Teeth Bleaching; Photoactivation; Semiconductor lasers; Diode laser; Microtensile.

scholarly journals Comparative Remineralization Efficacy of Topical NovaMin and Fluoride on Incipient Enamel Lesions in Primary Teeth: Scanning Electron Microscope and Vickers Microhardness Evaluation

2020 ◽  
Author(s):  
Safaa Shihabi ◽  
Salma AlNesser ◽  
John C. Comisi
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Primary Teeth ◽  
Vickers Microhardness ◽  
In Vitro Study ◽  
Demineralized Enamel ◽  
Significant Difference ◽  
Group 2 ◽  
Scanning Electron

Abstract Objective Evaluating the potential remineralization effect of NovaMin prophylaxis paste on artificial enamel lesions in primary teeth using Vickers microhardness and scanning electron microscope. Materials and Methods Forty sound buccal and lingual surfaces of human primary canine teeth were randomly divided into two groups after creating artificially demineralized lesions (G1: NovaMin and G2: fluoride; 20 per group) and then treated with the respective remineralization agents. The remineralization cycle repeated twice daily for 10 days. The groups were evaluated with Vickers microhardness and scanning electron microscope before and after de/remineralization. Results Statistically significant difference of microhardness was observed between demineralized enamel and remineralized enamel with group 1 and group 2 (p = 0.000 and p = 0.000, respectively). No statistically significant difference of microhardness was observed between two remineralized agents (p = 0.368). Conclusion Within the limitation of this in vitro study, NovaMin enhances the remineralization process equally to fluoride.

scholarly journals COMPARATIVE EVALUATION OF IATROGENIC DAMAGE IN CLASS II CAVITIES USING MAGNIFICATION TOOLS DURING TOOTH PREPARATION: AN IN VITRO STUDY

2020 ◽  
Vol 8 (11) ◽  
pp. 569-575
Author(s):  
Pooja Yadav ◽  
◽  
Ashish Jain ◽  
Rahul Rao ◽  
Harshil Patel ◽  
...  
Keyword(s):  
In Vitro Study ◽  
Class Ii ◽  
Vitro Study ◽  
Tooth Surface ◽  
Naked Eye ◽  
Significant Difference ◽  
Iatrogenic Damage ◽  
Tooth Preparation ◽  
Post Hoc

Aims: This is an vitro study compares and evaluates the effect of magnification tools on frequency and extent of iatrogenic damage to approximal tooth surface during conservative Class II cavity preparations. Methods and Material: 30 Typodont teeth were divided into 3 groups 10 typodont teeth in each group and were mounted on Phantom head. Teeth were prepared for class II (MO) cavity on 36 with conservative design using airotor with naked eye, loupes and microscope and iatrogenic damage was assessed on tooth no 35. Assessment of iatrogenic damage of all the groups was done by profilometer test. Statistical analysis used:Statistical analysis was done using one-way analysis of variance (ANOVA). Post-hoc pair-wise comparisons were done using Dunnetts test. Results: Results revealed that tooth preparation was better under microscopes and loupes with statistical significant difference for samples with loupes and microscope on comparison with naked eye. Study also expressed the difficulty faced during tooth preparation with microscope and loupes for the first time. Conclusions: Magnifying tools helps in better vision and less iatrogenic damage while preparing the tooth for restoration.

scholarly journals Effectiveness of calcium and sodium hypochlorite associated with passive ultrasonic irrigation on pulp tissue dissolution – An in vitro study

2016 ◽  
Vol 31 (3) ◽  
pp. 109
Author(s):  
Matheus Albino Souza ◽  
Ana Paula Almeida ◽  
Vitória Menin ◽  
Daniel Lima Dalla Lana ◽  
Ana Paula Farina ◽  
...  
Keyword(s):  
Sodium Hypochlorite ◽  
In Vitro Study ◽  
Pulp Tissue ◽  
Calcium Hypochlorite ◽  
Passive Ultrasonic Irrigation ◽  
Significant Difference ◽  
Before And After ◽  
Ultrasonic Irrigation ◽  
Group 5

Objectives: To compare, in vitro, the effectiveness of calcium hypochlorite and sodium hypochlorite associated with passive ultrasonic irrigation (PUI) on pulpal tissue dissolution.Methods: The pulp tissue of forty-five bovine incisors was removed and each complete pulp was divided into two pieces of similar volume, resulting in 90 pieces distributed into nine groups (n=10), according to dissolution procedure: G1: distilled water; G2: 2.5% NaOCl; G3: 5.25% NaOCl; G4: 2.5% Ca(OCl)2; G5: 5.25% Ca(OCl)2; G6: 2.5% NaOCl+PUI; G7: 5.25% NaOCl+PUI; G8: 2.5%Ca(OCl)2+PUI and G9: 5.25% Ca(OCl)2+PUI. Each sample was weighed on a high precision balance before and after the dissolution procedure. The differences in weights were calculated and the mean percentage loss was determined. The data were statistically analyzed using two-way ANOVA and Games-Howel tests at 5% significance level.Results: Group 5 (5.25% Ca(OCl)2), 6 (2.5% NaOCl+PUI), 7 (5.25% NaOCl+PUI), 8 (2.5% Ca(OCl)2+PUI) and 9 (5.25% Ca(OCl)2+PUI) showed the highest mean percentages of weight reduction when compared to other groups (p<0.001). However, there was no statistically significant difference between them (p<0.001).Conclusions: Ca(OCl)2 and PUI contributes significantly to dissolution of pulp tissue.

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