scholarly journals Fracture resistance of teeth obturated with two different types of Mineral Trioxide Aggregate Cements

2020 ◽  
Vol 23 (3) ◽  
Author(s):  
Nidambur Vasudev Ballal ◽  
Sheetal Rao ◽  
Junsang Yoo ◽  
Kishore Ginjupalli ◽  
Manuel Toledano ◽  
...  
Keyword(s):  
Root Canal ◽  
Fracture Resistance ◽  
Testing Machine ◽  
Positive Control ◽  
Negative Control ◽  
Control Group ◽  
Root Canals ◽  
Group I ◽  
Significant Difference ◽  
Group Ii

Objective: Endodontically obturated teeth have lower fracture resistance depending on the obturating material and technique. The purpose of this study was therefore to evaluate the influence of ProRoot MTA (Dentsply Sirona, Tulsa Division) and OrthoMTA III (BioMTA, Daejeon, Korea) as an obturating material on the fracture resistance of endodontically treated teeth. Material and Methods: Thirty extracted human maxillary central incisors were decoronated and instrumented using Protaper instruments (size F5). Irrigation was performed with 2.5% sodium hypochlorite between each instrument change followed by 7% maleic acid for one minute. Finally, canals were flushed with 5 ml of PBS solution for one minute. Samples were then divided into three groups. Group I- positive control (no root canal filling); Group II- obturation with ProRoot MTA; Group III- obturation with OrthoMTA III. Ten teeth were randomly selected as a negative control in which no treatment was performed. All the specimens were then subjected to fracture strength testing using universal testing machine. For evaluation of biomineralization, six maxillary central incisors were divided into two groups. Group I obturated with ProRoot MTA and group II obturated with OrthoMTA III. These samples were subjected to SEM analysis. Results: Positive control group demonstrated the least fracture resistance, while OrthoMTA III group showed the highest fracture resistance. There was no significant difference between negative control group and ProRoot MTA groups (p=0.821). OrthoMTA III group showed better tubular biomineralization when compared to ProRoot MTA. Conclusions: Root canals obturated with OrthoMTA III had better fracture resistance and increased tubular biomineralization compared to ProRoot MTA. Since root canals obturated with OrthoMTA III had better fracture resistance, it can be used as a promising obturating material.KeywordsBiomineralization; Fracture Resistance; OrthoMTA III; ProRoot MTA; Root Canal; Tubular.

In vitro Comparative Evaluation of the Fracture Resistance of Simulated Immature Teeth reinforced with Different Apical Barriers and Obturation Combination

2016 ◽  
Vol 7 (3) ◽  
pp. 113-118
Author(s):  
Neveen A Shaheen ◽  
Nahla G El-Din El-Helbawy
Keyword(s):  
Fracture Resistance ◽  
Comparative Evaluation ◽  
Negative Control ◽  
Control Group ◽  
Root Canals ◽  
Immature Teeth ◽  
Gutta Percha ◽  
Group I ◽  
Significant Difference

ABSTRACT Aim This study aimed to assess and compare the fracture resistance of simulated immature teeth reinforced with Biodentine (BD) and mineral trioxide aggregate (MTA) as apical barriers and two root canal backfilling combination (gutta-percha/AH26, MetaSeal). Materials and methods A total of 70 extracted human maxillary incisors were randomly divided into seven groups (n = 10). The positive control group was not instrumented. For the other groups, coronal access was made and root canals were instrumented using the ProTaper, up to F5 followed by six Peeso reamers which were allowed to pass 1 mm beyond the apex to size 6 (1.7 mm) to simulate immature teeth. The apical 4 mm of their root canals was filled with either MTA or BD apical barrier, then backfilled with gutta-percha/AH26 or MetaSeal obturation combination. The negative control group was left unfilled. Composite resin was used to restore the coronal access cavities. The maximum load for fracture of each tooth was recorded utilizing a universal testing machine. Data were analyzed using two-way analysis of variance. Results The noninstrumented group I had the highest fracture resistance and differed significantly (p < 0.05) from the negative control groups. On the contrary, no significant difference was found between BD and MTA groups, regardless of the backfilling combination (p > 0.05). Conclusion There was no difference between MTA and BD apical barriers and the backfilling combination regarding their resistance to root fracture. How to cite this article Shaheen NA, El-Din El-Helbawy NG. In vitro Comparative Evaluation of the Fracture Resistance of Simulated Immature Teeth reinforced with Different Apical Barriers and Obturation Combination. World J Dent 2016;7(3):113-118.

scholarly journals Fracture Resistance of Simulated Immature Teeth Reinforced with Different Mineral Aggregate-Based Materials

2021 ◽  
Vol 32 (3) ◽  
pp. 21-31
Author(s):  
Mariana Travi Pandolfo ◽  
Gabriela Rover ◽  
Eduardo Antunes Bortoluzzi ◽  
Cleonice da Silveira Teixeira ◽  
Hebert Luís Rossetto ◽  
...  
Keyword(s):  
Root Canal ◽  
Fracture Resistance ◽  
Testing Machine ◽  
Mineral Trioxide Aggregate ◽  
Positive Control ◽  
Negative Control ◽  
Homogeneous Distribution ◽  
Root Canal Filling ◽  
Immature Teeth ◽  
Significant Difference

Abstract This study assessed the fracture resistance of simulated immature teeth reinforced with calcium aluminate cement (CAC) or mineral trioxide aggregate (MTA) containing calcium carbonate nanoparticles (nano-CaCO3). The microstructural arrangement of the cements and their chemical constitution were also evaluated. Forty-eight canines simulating immature teeth were distributed into 6 groups (n=8): Negative control - no apical plug or root canal filling; CAC - apical plug with CAC; CAC/nano-CaCO3 - apical plug with CAC+5% nano-CaCO3; MTA - apical plug with MTA; MTA/nano-CaCO3 - apical plug with MTA+5% nano-CaCO3; and Positive control - root canal filling with MTA. The fracture resistance was evaluated in a universal testing machine. Samples of the cements were analyzed under Scanning Electron Microscope (SEM) to determine their microstructural arrangement. Chemical analysis of the cements was performed by Energy Dispersive X-ray Spectroscopy (EDS). The fracture resistance of CAC/nano-CaCO3 was significantly higher than the negative control (p<0.05). There was no significant difference among the other groups (p>0.05). Both cements had a more regular microstructure with the addition of nano-CaCO3. MTA samples had more calcium available in soluble forms than CAC. The addition of nano-CaCO3 to CAC increased the fracture resistance of teeth in comparison with the non-reinforced teeth. The microstructure of both cements containing nano-CaCO3 was similar, with a more homogeneous distribution of lamellar- and prismatic-shaped crystals. MTA had more calcium available in soluble forms than CAC.

scholarly journals Cardioprotective effect of ethanolic extract of mengkudu (Morinda citrifolia) on rats induced by doxorubicin

2019 ◽  
Vol 4 (4) ◽  
pp. 7-12
Author(s):  
Lyvia Lovin ◽  
Nyoman Ehrich Lister I ◽  
Edy Fachrial ◽  
Sukirman Lie
Keyword(s):  
Treatment Group ◽  
Ethanol Extract ◽  
Negative Control Group ◽  
Positive Control ◽  
Negative Control ◽  
Positive Control Group ◽  
Control Group ◽  
Group I ◽  
Significant Difference ◽  
Group Ii

Doxorubicin is an effective drug used in cancer therapy but produces reactive oxygen species (ROS) that are toxic to heart cells. The purpose of this study was to determine the cardioprotective activity of Mengkudu fruit ethanol extract against the heart induced by doxorubicin. Mengkudu fruit ethanol extract was obtained by maceration. Cardioprotective activity test is done by measuring blood LDH and CK-MB levels as well as cardiac histology. Animals were induced with DOX 5 mg/kg BW on day 1,7,14 and 20th. Administration of Mengkudu extract 100 mg / kg bw, 300 mg / kg bw, and 500 mg / kg BW given from day 1 to day 20 and on the 21st day cardiac serum levels of CK-MB normal group had a significant difference (p <0.05) with a negative control treatment group, treatment group I, treatment group II, and treatment group III and did not have a significant difference (P> 0.05) with a positive control group with vitamin e supplementation and serum LDH levels the normal group had a significant difference (p <0.05) with the negative control group, the treatment group I, the treatment group II, and the treatment group II and did not have a significant difference (P> 0.05) with the positive control group with vitamin e supplementation. Cardiology histology of the Mengkudu extract 100 mg/kg bw + DOX and the Mengkudu extract 300 mg/kg bb + DOX, and the negative control group showed bleeding, fragmentation and myocytolysis, in the treatment of group III, the group normal, and the positive control group did not show heart muscle damage. Based on the description above it can be concluded that the ethanol extract of Mengkudu fruit containing flavonoids has cardioprotective activity by inhibiting the formation of ROS. The higher the dose of an extract, the greater the decrease in LDH and CKMB levels and increase protection against heart damage.

scholarly journals Resistance to Fracture of Dental Roots Obturated with Different Materials

2015 ◽  
Vol 2015 ◽  
pp. 1-5 ◽  
Author(s):  
Berkan Celikten ◽  
Ceren Feriha Uzuntas ◽  
Kamran Gulsahi
Keyword(s):  
Fracture Resistance ◽  
Testing Machine ◽  
Negative Control Group ◽  
Positive Control ◽  
Negative Control ◽  
Positive Control Group ◽  
Control Group ◽  
Root Canal Filling ◽  
Filling Materials ◽  
Group 2

The aim of this study was to compare the vertical fracture resistance of roots obturated with different root canal filling materials and sealers. Crowns of 55 extracted mandibular premolar teeth were removed to provide root lengths of 13 mm. Five roots were saved as negative control group (canals unprepared and unfilled). Fifty root canals were instrumented and then five roots were saved as positive control group (canals prepared but unfilled). The remaining 45 roots were randomly divided into three experimental groups (n=15root/group) and obturated with the following procedures: in group 1, glass ionomer-based sealer and cone (ActiV GP obturation system); in group 2, bioceramic sealer and cone (EndoSequence BC obturation system); and in group 3, roots were filled with bioceramic sealer and cone (Smartpaste bio obturation system). All specimens were tested in a universal testing machine for measuring fracture resistance. For each root, the force at the time of fracture was recorded in Newtons. The statistical analysis was performed by using Kruskal-Wallis and post hoc test. There were no significant differences between the three experimental groups. The fracture values of three experimental and negative control groups were significantly higher than the positive control group. Within the limitations of this study, all materials increased the fracture resistance of instrumented roots.

scholarly journals Comparative Evaluation of Fracture Resistance of Endodontically Treated Teeth Restored with Resin Fiber Post and Stainless Steel Post: An In Vitro Study

2015 ◽  
Vol 03 (02) ◽  
pp. 080-084
Author(s):  
Vijay Singh ◽  
Poonam Bogra ◽  
Saurabh Gupta ◽  
Navneet Kukreja ◽  
Neha Gupta
Keyword(s):  
Stainless Steel ◽  
Fracture Resistance ◽  
Testing Machine ◽  
Compressive Force ◽  
Control Group ◽  
Fiber Post ◽  
Endodontically Treated Teeth ◽  
Group I ◽  
Significant Difference

AbstractFracture resistance of endodontically treated teeth restored with post. Aims: This study aims to compare the fracture resistance of endodontically treated teeth restored with resin fiber and stainless steel post. Commercially available prefabricated resin fiber post(Dentsply Maillefer Easy Post), prefabricated stainless steel post(Coltene/Whaledent Parapost) were used. Methods and Material: Forty five maxillary central incisors were obturated and divided into 3 groups: Control Group (Group I) without any post (n = 15), Resin Fiber Post Group (Group II) (n = 15) and Stainless Steel Post Group (Group III) (n = 15). In all Groups except control group, post space was prepared; a post was cemented, and a core build-up was provided. All the specimens were subjected to compressive force under a universal testing machine until fracture. Statistical analysis used: The results were analyzed using the variable analysis test (ANOVA). Results: One-way analysis of variance revealed significant difference among test groups. The control group demonstrated highest fracture resistance (925.2183 N), followed by the resin fiber post group (486.7265 N) and stainless steel post group (423.539N). Conclusions: Teeth restored with resin fiber post showed higher fracture resistance values than prefabricated stainless steel post.

scholarly journals Evaluation of the Sealing Ability of Three Obturation Techniques Using a Glucose Leakage Test

2017 ◽  
Vol 2017 ◽  
pp. 1-8 ◽  
Author(s):  
Katarzyna Olczak ◽  
Halina Pawlicka
Keyword(s):  
Continuous Wave ◽  
Negative Control Group ◽  
Positive Control ◽  
Negative Control ◽  
Control Group ◽  
Thermal Methods ◽  
Root Canals ◽  
Anterior Teeth ◽  
Sealing Ability ◽  
Significant Difference

The aim of this study was to evaluate the sealing ability of three different canal filling techniques. Sixty-four roots of extracted human maxillary anterior teeth were prepared using ProTaper® rotary instruments. The specimens were then randomly divided into 3 experimental groups (n=16) and 2 control groups (n=8). The root canals were filled using cold lateral compaction (CLC group), continuous wave condensation technique using the Elements Obturation Unit® (EOU group), and ProTaper obturators (PT group). For the negative control group, 8 roots were filled using lateral compaction as in the CLC group, and the teeth were covered twice with a layer of nail varnish (NCG group). Another 8 roots were filled using lateral compaction, but without sealer, and these were used as the positive control (PCG group). A glucose leakage model was used for quantitative evaluation of microleakage for 24 hours and 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, and 12 weeks. No significant difference in the cumulative amount of leakage was found between the three experimental groups at all observation times. The lateral condensation of cold gutta-percha can guarantee a similar seal of canal fillings as can be achieved by using thermal methods, in the round canals.

scholarly journals Efektivitas Ekstrak Artemisia vulgaris L. sebagai Hepatoprotektor pada sel-sel Hati Tikus yang Diinduksi Niasin

2018 ◽  
Vol 6 (2) ◽  
pp. 251
Author(s):  
Laily Rahmawati ◽  
Erma Sulistyaningsih ◽  
Rosita Dewi
Keyword(s):  
Treatment Group ◽  
Liver Damage ◽  
Negative Control Group ◽  
Positive Control ◽  
Negative Control ◽  
Positive Control Group ◽  
Control Group ◽  
Artemisia Vulgaris ◽  
Group I ◽  
Group Ii

  The niacin in energy drinks has metabolic product that cause oxidative stress and liver damage, while the liver damage can be prevented by hepatoprotective agents. Scoparone in Artemisia vulgaris L. can act as a hepatoprotector by its antioxidant effect. This study aimed to investigate the effectivity of Artemisia vulgaris L. extract as a hepatoprotector in wistar hepatocytes induced by niacin. This study used 25 male rats which were divided into 5 groups: normal, the negative control, the positive control, the treatment group I, and II. Treatment was conducted for 28 days. The samples were terminated and the hepatocyte were prepared for histological examination. Histological appearance was catagorized as mild, moderate, and severe damage with or without inflamatory cells activity. The data analysis by Kruskal Wallis showed significant difference (p<0,001). Further analysis by Mann Whitney revealed significantly difference (p<0,05) between normal group and all groups, negative control group and positive control group, and positive control group and treatment group I, but not significantly difference between negative control group and treatment group I, negative control group and treatment group II, positive control group and treatment group II, and between treatment groups. The study concluded that the effectivity of Artemisia vulgaris L. extract has not been proven as a hepatoprotector but further study is needed to draw a definite conclusion.   Keywords: energy drink, niacin, Artemisia vulgaris L., hepatoprotector  

scholarly journals A Digital Microscopic Inspection of Dentinal Defects after Using Endodontic Retreatment Files

2021 ◽  
Vol 2021 ◽  
pp. 1-6
Author(s):  
Ammar AbuMostafa ◽  
Hala Almoqayyad ◽  
Al-Omari Mohammad
Keyword(s):  
Negative Control Group ◽  
Positive Control ◽  
Negative Control ◽  
Control Group ◽  
Filling Material ◽  
Root Canals ◽  
Root Canal Retreatment ◽  
Significant Difference ◽  
Digital Microscope ◽  
Microscopic Inspection

Aim. The study aimed at evaluating the incidence of dentinal defects after root canal retreatment with ProTaper Universal retreatment (PTUR) and XP-endo Shaper and Finisher R (XP). Materials and Methods. Sixty extracted single-rooted human premolars were selected and divided into 4 groups of 15 teeth each. In the negative control group, the teeth were left unprepared. In the positive control group, the teeth were prepared with ProTaper Next and obturated with no further retreatment. In the PTUR and XP groups, the teeth were prepared and obturated followed by removal of the filling material at body temperature using PTUR and XP instruments, respectively. The roots were then sectioned at 3, 6, and 9 mm from the apex and observed under a digital microscope to detect defects. Results. PTUR group showed significantly higher ( p value <0.05) incidence of defects than the other groups. Comparison of no defects versus defects between groups in different areas of root canals demonstrated significant difference among the groups in the apical and cervical regions. Conclusion. Within the limitations of the present study, PTUR files created significantly more dentinal defects than XP files, with most of those defects at the cervical and apical areas of the root canals.

scholarly journals Comparative Evaluation of Apical Sealing Ability of Different Obturation Techniques by Confocal Microscopy: An In Vitro Study

2020 ◽  
Vol 8 (02) ◽  
pp. 55-59
Author(s):  
Reetu Arora ◽  
Yogesh Kumar ◽  
Neetu Jindal ◽  
Renu Aggarwal ◽  
Kavneet Takhar
Keyword(s):  
Root Canal ◽  
Negative Control Group ◽  
Positive Control ◽  
Negative Control ◽  
Group Iv ◽  
Control Group ◽  
Group Vi ◽  
Group V ◽  
Group Iii ◽  
Group I

Abstract Introduction The aim of obturation in the root canal is to completely seal the canal space to eliminate all the portals of entry and exit between root canal and periodontal space. Various techniques have been developed to achieve a hermetic seal. Materials and Methods As many as 150 extracted human maxillary central incisors were taken for the study. Biomechanical preparation was done up to F5 protaper file. According to different obturation techniques, samples were divided into six groups, keeping 30 samples in experimental and 15 samples in control groups. Group I–Lateral Condensation, Group II–Thermafil, Group III–Beefill, Group IV–GuttaFlow, Group V–Positive Control group, Group VI–Negative Control group. After obturation, the samples were immersed in 2% Rhodamine-B dye for 24 hours. Each sample was longitudinally sectioned to examine under confocal laser scanning microscope. Statistical Analysis The results were evaluated with ANOVA and posthoc Tukey honest significant difference (HSD) comparison test. Results The mean values of dye penetration of different groups were Group I (Lateral Condensation) 1.51 ± 0.451, Group II (Thermafil) 0.918 ± 0.399, Group III (Beefill) 1.30 ± 0.559. Group IV (GuttaFlow) 0.655 ± 0.396, Group V (Positive Control group) 1.96 ±0.046, Group VI (Negative Control group) 0 ± 0. The lowest mean value of apical microleakage was found in GuttaFlow amongst all experimental groups. Conclusion It can be concluded that the GuttaFlow obturating material exhibited better apical sealing ability with canal walls.

scholarly journals The influence of working length on the reduction of biofilm and planktonic bacteria in oval canals with reciprocating instrumentation

2021 ◽  
Vol 10 (5) ◽  
pp. e9810514765
Author(s):  
Arieth Cristina Sacomani ◽  
Fernanda Tessaro Cintra ◽  
Adriana de Jesus Soares ◽  
Marcos Frozoni
Keyword(s):  
Bacterial Growth ◽  
Root Canal ◽  
Negative Control ◽  
Bacterial Biofilm ◽  
Control Group ◽  
Root Canal Preparation ◽  
Root Canals ◽  
Planktonic Bacteria ◽  
Working Length ◽  
Significant Difference

To evaluate the influence of reciprocating single-file instrumentation with different working lengths (WL) on the reduction of planktonic bacteria and bacterial biofilm in Enterococcus faecalis-contaminated oval root canals. Methodology: Fifty-five human single-rooted canines were used. Fifty were inoculated with E. faecalis for 21 days for biofilm formation. To confirm the formation of biofilm adhered to the root canal wall, 5 contaminated samples from positive control group were analyzed by SEM. Samples were assigned into 3 groups (n = 15) according to working length determined, G+1 root canal preparation 1 mm beyond the apical foramen, G0 root canal preparation at the major foramen, and G-1 root canal preparation 1 mm short of the major foramen. Five roots were not inoculated to serve as a negative control. Bacteriological samples were collected prior to preparation, initial collection (S1), and after reciprocating instrumentation (S2) by disaggregating biofilm to quantify the reduction of planktonic bacteria and intracanal biofilm at different WL. Bacterial quantitation was performed using colony-forming units per milliliter (CFU / mL) count. Statistical analysis was performed at the significance level of 0.05. Results: No bacterial growth was observed in the negative control. All positive controls demonstrated bacterial growth; S1 from all teeth were positive for bacteria with no significant difference. The post-hoc analysis showed G+1 promoting a significantly higher disinfection than G-1 (p<0,05) and G-1 similar disinfection to G0 (P=962). Conclusion: Instrumentation as close as possible to major foramen or beyond it improves decontamination in oval root canals with reciprocating instrumentation.

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