scholarly journals Influence of different methods of cervical flaring on establishment of working length

2006 ◽  
Vol 14 (5) ◽  
pp. 351-354 ◽  
Author(s):  
Dieison Nardi Lazzaretti ◽  
Bernardo Alievi Camargo ◽  
Alvaro Della Bona ◽  
Volmir João Fornari ◽  
José Roberto Vanni ◽  
...  
Keyword(s):  
Analysis Of Variance ◽  
Sodium Hypochlorite ◽  
Statistical Difference ◽  
Length Measurement ◽  
Pulp Chamber ◽  
Tukey Test ◽  
Working Length ◽  
Group 3 ◽  
Group 2 ◽  
Group 1

OBJECTIVE: to investigate the influence of three different rotary systems for cervical flaring on establishment of the real working length. MATERIAL AND METHODS: Thirty mandibular first molars were submitted to conventional endodontic access and initial working length measurement, followed by irrigation/suction of the pulp chamber with 5% sodium hypochlorite. Teeth were randomly divided into 3 groups (n=10) and cervical flaring of the mesiobuccal canals were performed using one of the following instrument systems: Group 1 - Gates-Glidden burs; Group 2 - Orifice Openers; Group 3 - La Axxess system. Two subsequent numbers of instruments of each rotary system were used and the final working length was recorded. A digital calyper was used to record the working length, in millimeters, to investigate a possible discrepancy between initial and final measurements. RESULTS: Analysis of variance (Anova) na Tukey test revealed statistical difference between Group 1 and Groups 2 and 3 (p£ 0.05). CONCLUSIONS: all groups presented shorter working length after cervical flaring; groups prepared with instruments La Axxes and Orifice Opener presented the best results among the systems studied.

scholarly journals Comparative evaluation of various endodontic irrigants on apical extrusion of debris

2013 ◽  
Vol 60 (3) ◽  
pp. 119-123
Author(s):  
Sameer Makkar ◽  
Simranjeet Kaur
Keyword(s):  
Sodium Hypochlorite ◽  
Test Results ◽  
Root Canal Preparation ◽  
Root Canals ◽  
Tukey Test ◽  
Group 4 ◽  
Apical Extrusion ◽  
Group 3 ◽  
Group 2 ◽  
Group 1

Introduction. All techniques and instruments used to clean and shape canals produce some amount of apically extruded debris. The type of irrigant can affect the amount of apically extruded debris. The aim of the present study was to quantitatively compare the amount of debris extruded apically from root canals when three different irrigants were used during canal preparation with hand instruments. Material and Methods. Twenty extracted single-rooted human mandibular premolars with straight root canals were used. The teeth were randomly divided into 4 groups based on the irrigant used: Group 1: Biopure MTAD (Dentsply), Group 2: 3% NaOCl (Prima Dentalproducts), Group 3: 2% Chlorhexidine (Vishal Industries, Gujarat), Group 4: Control (no irrigation). Debris extruded through apical foramen during root canal preparation was collected into pre weighed empty guttapercha tubes. The weight of dry extruded debris was calculated by subtracting the preinstrumentation and postinstrumentation weight for each group. Obtained data was analyzed using one-way analysis of variance and Tukey test. Results. Group 2 (3% sodium hypochlorite) had the greatest amount of extruded debris which was significantly different from other groups (p<0.05). Conclusion. The type of used irrigant can affect the amount of apically extruded debris. Sodium hypochlorite in the concentration of 3% showed the greatest amount of extruded debris.

scholarly journals Comparative Evaluation of Cleaning Efficacy of Three Different Single File Systems: An In Vitro Study

2021 ◽  
pp. 26-31
Author(s):  
Deebah Choudhary
Keyword(s):  
File Systems ◽  
In Vitro Study ◽  
Single File ◽  
Working Length ◽  
Group 3 ◽  
Group 2 ◽  
Cleaning Efficacy ◽  
Scanning Electron ◽  
Group 1

Aim: The aim of this study was to evaluate the canal cleaning efficacy of these three file systems using scanning electron microscopy. Place and Duration of Study: The study was conducted in the Department of Conservative dentistry and Endodontics, Institute of Dental Sciences Sehora, between October 2020 and December 2020. Materials and Methods: Access cavity preparation was performed on sixty extracted human mandibular premolar teeth and working length was determined. The samples were randomly divided into three groups (n=20) depending upon the file system used i.e. Group 1 (Reciproc Blue), Group 2 (Waveone Gold) and Group 3 (F360). Samples were split into two halves by creating longitudinal grooves on the buccal and lingual surfaces. The samples were sputter-coated with gold and examined under scanning electron microscope at 5000X. The dentinal wall of root canal at coronal, middle and apical thirds of each sample were evaluated for the presence of determining the canal cleanliness and then analyzed using a five-score index. Results: The results of this study revealed that Group 1 (Reciproc Blue) exhibited better cleaning efficacy than samples of Group 2 (WaveOne Gold) and Group 3 (F360) at different locations in the canal i.e. coronal, middle and apical. The mean debris present was highest in coronal area for both group 2 and group 3 i.e. 2.1 and least was seen in apical area of group 1 i.e. 0.3. (p<0.05) Conclusion: Reciproc Blue single-file showed highest cleaning efficacy followed by Waveone Gold and F360. Reciproc file also showed effective cleaning in the apical third of the canal.

scholarly journals Comparison of cyclic fatigue of a reciprocating file system at different angles of rotation

2021 ◽  
Vol 11 (Suppl. 1) ◽  
pp. 67-73
Author(s):  
Ahmet Akay ◽  
Özkan Adıgüzel ◽  
Seda Erkan Akay ◽  
Sadullah Kaya
Keyword(s):  
Analysis Of Variance ◽  
Fatigue Resistance ◽  
File System ◽  
Cyclic Fatigue ◽  
Curvature Radius ◽  
Two Samples ◽  
Significant Difference ◽  
Group 3 ◽  
Group 2 ◽  
Group 1

Aim: The purpose of this in vitro study is to compare the cyclic fatigue resistance of Reciproc Nickel-Titanium (Ni-Ti) rotary files while operating root canals using in three different reciprocal angles. Methodology: Forty-five pieces of Reciproc R25 canal files were tested using artificial canals with a 60° angle of curvature, 5 mm curvature radius, and 1.5 mm diameter carved into a stainless steel block. The Ni-Ti files were checked with a stereomicroscope and then randomly separated into 3 groups. Group 1 consisted of reciprocal angles CCW 150°–CW 30°, Group 2 consisted of CCW 180°–CW 60°, and Group 3 consisted of CCW 210°–CW 90°. The duration of the cyclic fatigue being measured, elapsed time until a file fractured was determined with a chronometer. The lengths of the fractured pieces were measured with a digital caliper. After the cyclic fatigue test, two samples from each group were examined with a Scanning Electron Microscope (SEM) to determine the signs of cyclic fatigue. Results: One-way analysis of variance (ANOVA) was applied to the normally distributed groups (p<0,05). Since there was a significant statistical difference of file’s cyclic fatigue resistance (p=0,001) between the groups, Tukey’s honestly significant difference (HSD) post-hoc pairwise comparison test were used for determine to between which groups. While there were statistically significant differences between Group 1 and Group 2 (p=0,001), and between Group 1 and Group 3 (p=0,001), there was no significant difference between Group 2 and Group 3 (p=0,376). Group 1 displayed the highest resistance to cyclic fatigue. There were no statistically significant differences between the lengths of the fractured files within the three groups according to the one-way analysis of variance (p=0,847). Conclusion: In our study, it was observed that the reciprocal angles of CCW 150°–CW 30°, which were also suggested by the file manufacturer firms, had the highest fracture resistance against cyclic fatigue.   How to cite this article: Akay A, Adıgüzel Ö, Erkan Akay S, Kaya S. Comparison of cyclic fatigue of a reciprocating file system at different angles of rotation. Int Dent Res 2021;11(Suppl.1):67-72. https://doi.org/10.5577/intdentres.2021.vol11.suppl1.11   Linguistic Revision: The English in this manuscript has been checked by at least two professional editors, both native speakers of English.  

scholarly journals Incidence of Meniscal Tears Accompanying ACL Ruptures

2014 ◽  
Vol 2 (11_suppl3) ◽  
pp. 2325967114S0012
Author(s):  
Mehmet Hasan Tatari ◽  
Vugar Guliyev
Keyword(s):  
Statistical Difference ◽  
Meniscal Tear ◽  
Operation Time ◽  
Variance Analysis ◽  
Meniscal Tears ◽  
Chi Square ◽  
Group 3 ◽  
Group 2 ◽  
Bucket Handle ◽  
Group 1

Objectives: Anterior cruciate ligament (ACL) injury is a common disorder in athletes and in most cases, meniscal tears accompany. These meniscal tears can be the result of the initial trauma or the consecutive injuries in the unoperated patients. The aim of the study was to compare the incidence of meniscal tears in the patients operated because of ACL defficiency in the early or late period after the initial trauma. The age of the patient and meniscal tear pattern were the other subjects compared. Methods: The groups included 42, 72 and 129 patients respectively. Among all groups, it was shown that in 125 cases (% 51.4), a meniscal tear accompanied the ACL tear. In Group 1, 18 cases (% 42.8) had meniscal tears while 29 patients (% 37) in Group 2 and 78 patients (% 60.4) in Group 3 had any kind of meniscal tear. Bucket handle tears constituted 38 % of all tears in Group 1, 53 % in Group 2 and 56 % in Group 3. There was a significant statistical difference between the groups among the presence of meniscal tear and the period between the initial trauma and operation time. When the patients accepted the operation in the first six months after the initial trauma, the incidence of the meniscal injury decreased significantly (chi-square test) (p <0,01). There was no statistical difference between three groups among the percentage of bucket handle tears (variance analysis: p=0,196). The statistical difference was not important between the groups among the age of the patients in relation with the pattern of the meniscal tears (variance analysis: p=0,236). Results: The groups included 42, 72 and 129 patients respectively. Among all groups, it was shown that in 125 cases (% 51.4), a meniscal tear accompanied the ACL tear. In Group 1, 18 cases (% 42.8) had meniscal tears while 29 patients (% 37) in Group 2 and 78 patients (% 60.4) in Group 3 had any kind of meniscal tear. Bucket handle tears constituted 38 % of all tears in Group 1, 53 % in Group 2 and 56 % in Group 3. There was a significant statistical difference between the groups among the presence of meniscal tear and the period between the initial trauma and operation time. When the patients accepted the operation in the first six months after the initial trauma, the incidence of the meniscal injury decreased significantly (chi-square test) (p <0,01). There was no statistical difference between three groups among the percentage of bucket handle tears (variance analysis: p=0,196). The statistical difference was not important between the groups among the age of the patients in relation with the pattern of the meniscal tears (variance analysis: p=0,236) Conclusion: We can say that the incidence of meniscal tears can be decreased if the patients with ACL injury are operated early after the initial trauma. Earlier ACL reconstruction means less meniscal tear.

scholarly journals Clinical Study of Sodium Hypochlorite, Polymyxin B And Limewater Effect on MMP-3,-8,-9 In Apical Periodontitis

2020 ◽  
Vol 31 (2) ◽  
pp. 116-121 ◽  
Author(s):  
Cláudio Antonio Talge Carvalho ◽  
Amjad Abu Hasna ◽  
Alessandra Sverberi Carvalho ◽  
Polyana das Graças Figueiredo Vilela ◽  
Lucas de Paula Ramos ◽  
...  
Keyword(s):  
Clinical Study ◽  
Sodium Hypochlorite ◽  
Root Canal ◽  
Polymyxin B ◽  
Apical Periodontitis ◽  
Group 3 ◽  
Group 2 ◽  
Group 1

Abstract This study aimed to evaluate sodium hypochlorite (NaOCl), limewater (LW), and Polymyxin B (PMB) as irrigants over MMP-3, MMP-8 and MMP-9. Thirty-three patients with apical periodontitis of single-rooted teeth were treated according to three-experimental groups (n=11): group-1: 2.5% NaOCl was used as irrigant; group-2: 2.5% NaOCl for the first two files and LW: [0.14% Ca(OH)2] for the last two files; group-3: 2.5% NaOCl for the first two files and PMB for the last two files. The association of Ca(OH)2 and CHX was used as an intracanal medication in all groups. Four root canal samplings (S) were collected: S1) immediately after access cavity; S2) after biomechanical preparation; S3) after EDTA application; and S4) after removal of the intracanal medication. After quantification of MMP-3, MMP-8, and MMP-9, the data were analyzed by Friedman and Kruskal-Wallis tests and completed by Dunn test (5%). Regardless the used irrigant, there was no difference in reducing MMP-3 or MMP-8 (P=0,5273, P=0,7048 respectively). However, in reducing MMP-9 (P=0,0246) the NaOCl group was the most effective followed by NaOCl+LW group and NaOCl+PMB group respectively. The intracanal medication [Ca(OH)2 + CHX] with the NaOCl and NaOCl+LW was effective in reducing MMP-8 (P<0,0001, P=0,0025) and MMP-9 (P=0,0007, P=0,0047) respectively, but not for the group of NaOCl+PMB which was not effective in reducing MMP-8 or MMP-9 (P=0,1718, P=0,1953) respectively. NaOCl and NaOCl+LW were effective in reducing MMP-9 levels, and this effectivity could be improved by the use of the intracanal medication [Ca(OH)2 + CHX] in reducing MMP-8 and MMP-9 levels.

scholarly journals Evaluation of the permeability of the furcation area of deciduous molars conditioned with Er:YAG laser and cyanoacrylate

2003 ◽  
Vol 17 (3) ◽  
pp. 212-216 ◽  
Author(s):  
Adriene Mara Souza Lopes-Silva ◽  
José Luiz Lage-Marques
Keyword(s):  
Treatment Group ◽  
Er:Yag Laser ◽  
Pulp Chamber ◽  
Analysis Group ◽  
Group 4 ◽  
Group 3 ◽  
Group 2 ◽  
Deciduous Molars ◽  
Group 1

The purpose of this study was to evaluate in vitro the dentin permeability of the deciduous pulp chamber floor after employing 2-octyl cyanoacrylate and Er:YAG laser. Twenty four deciduous molars were used, divided into four groups. After chemical-surgical preparation each group received a different treatment: Group 1 - control, without treatment; Group 2 - the floor of the pulp chamber was covered with a fine layer of 2-octyl cyanoacrylate; Group 3 - the floor of the pulp chamber was irradiated with Er:YAG laser (250 mJ, 10 Hz for 30 seconds, 80 J of energy and 320 pulses), and covered with a fine layer of 2-octyl cyanoacrylate; and Group 4 - the floor of the pulp chamber was irradiated with Er:YAG laser set at the parameters already described. After that the specimens received application of 0.5% methylene blue, for 15 minutes. The teeth were cut, photographed, and the digitalized images were analyzed using the ImageLab program. The results obtained were submitted to statistical analysis. Group 4 (Er:YAG) presented the largest averages in percentage of dye penetration area (19.5%), followed by Group 1 (11.1%), Group 3 (1.4%) and Group 2 (0.2%). The experimental model allowed to conclude that the specimens conditioned with 2-octyl cyanoacrylate (Group 2) and Er:YAG laser associated to 2-octyl cyanoacrylate (Group 3) presented a decrease in permeability, and the specimens treated with Er:YAG laser (Group 4) presented an increase in permeability of the analyzed area.

scholarly journals Effect of Accelerated Aging on the Sorption and Solubility Percentages of Silicone Facial Prostheses

2021 ◽  
Author(s):  
Adhara Smith Nóbrega ◽  
Clóvis Lamartinede Moraes Melo Neto ◽  
Daniela Micheline dos Santos ◽  
André Pinheirode Magalhães Bertoz ◽  
André Luiz de MeloMoreno ◽  
...  
Keyword(s):  
Statistical Analysis ◽  
Accelerated Aging ◽  
Time Points ◽  
Tukey Test ◽  
Group 4 ◽  
Facial Prostheses ◽  
Group 3 ◽  
Group 5 ◽  
Group 2 ◽  
Group 1

Abstract Objective This study aimed to evaluate the effect of accelerated aging on the sorption and solubility percentages of the MDX4-4210 and A-2186 silicones. Materials and Methods Two silicones (A-2186 and MDX4-4210) and three intrinsic pigments (bronze, black, and pink) were used in this study. Thus, six groups were created (n = 10): Group 1 = bronze MDX4-4210; Group 2 = black MDX4-4210; Group 3 = pink MDX4-4210; Group 4 = bronze A-2186; Group 5 = black A-2186; and Group 6 = pink A-2186. The dimensions of all samples were the same (45-mm diameter (ø) × 1-mm thickness). The samples were aged for a total of 1,008 hours. In this period of 1,008 hours of accelerated aging, the sorption and solubility percentages of each sample were calculated at three time points (252, 504, and 1,008 hours). Statistical Analysis Three-way analysis of variance (ANOVA) and the Tukey test were performed (α = 0.05). Result Accelerated aging can significantly increase the sorption and solubility percentages of the MDX4-4210 and A-2186 silicones.

scholarly journals Apical Extrusion of Debris during Root Canal Preparation with ProTaper Next, WaveOne Gold and Twisted Files

Materials ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6254
Author(s):  
Wojciech Eliasz ◽  
Beata Czarnecka ◽  
Anna Surdacka
Keyword(s):  
Root Canal ◽  
Root Canal Preparation ◽  
Movement Kinematics ◽  
Liquid Component ◽  
Apical Extrusion ◽  
Working Length ◽  
Adaptive Motion ◽  
Group 3 ◽  
Group 2 ◽  
Group 1

(1) Background: Apical extrusion of debris is an example of a complication that may arise during root canal treatment, and it has been proven to be an unavoidable occurrence during endodontic treatment by numerous authors. Even though it may not hinder the long-term outcome of treatment, it may lead directly to increased levels of postoperative pain and, therefore, lower levels of patient acceptance and satisfaction. The aim of the study was to assess the weight of apically extruded debris during root canal preparation with instruments that use different movement kinematics (rotary, reciprocating, and adaptive motion); (2) Methods: The study was performed using the Myers and Montgomery model. Sixty human premolar teeth were inserted into preweighed Eppendorf tubes and randomly classified into three groups. After manual glide-path preparation, teeth in each group were instrumented to working length set 1 mm short of the anatomical apex using the standard sequence provided by the manufacturers (for Group 1: ProTaper Next X1 & X2; for Group 2: WaveOne Gold Primary, for Group 3: Twisted Files SM1-SM3). Root canals were irrigated with 1 mL of 0.9% NaCl solution between each file insertion. The tubes with collected debris were stored in an incubator at 70 °C for 5 days in order to evaporate the liquid component. Measurement of the weight of extruded debris was performed by subtracting the preinstrumentation from the postinstrumentation weight of the tubes. The results were analyzed with Kruskal–Wallis ANOVA, with significance level set at 0.05; (3) Results: The weight of extruded debris was 0.337 mg (SD = 0.148) for Group 1, 0.305 mg (SD = 0.201) for Group 2, and 0.348 mg (SD = 0.135) for Group 3. (4) Conclusions: Engine-driven root canal preparation with the use of instruments ProTaper Next, WaveOne Gold and Twisted Files that use different movement kinematics (rotary, reciprocating, and adaptive motion) was associated with apical extrusion of debris to a similar extent.

scholarly journals Rational Decision On the Use of Antibiotics During the Dry Period in Dairy Cows

2019 ◽  
Author(s):  
Luis O. Lopes ◽  
Anna M. C. Lima
Keyword(s):  
Dairy Cows ◽  
Somatic Cell ◽  
Statistical Difference ◽  
Coagulase Negative Staphylococcus ◽  
Dry Period ◽  
Microbiological Culture ◽  
Group 3 ◽  
Group 2 ◽  
Sealant Group ◽  
Group 1

ABSTRACTThe aim of this study was to evaluate the use of antibiotics in cows during the dry period. The survey was performed on 148 teats during the dry period, with sample collection in the period D-70 (70 days before delivery) and D14 (14 days after delivery). The milk samples were collected for the Strip Cup Test (SCT), California Mastitis Test (CMT), Microbiological Culture, Somatic Cell Count (SCC), Somatic Cell Score (SCS) and Hyperkeratosis (HK). The groups in which there were no microorganisms grow were divided into two groups, in the first group only the internal sealant in the teat was used (Group 1) and there was another group with the intramammary antibiotic use associated with the internal sealant (Group 2). Teats which were considered positive, with microbiological growth, were treated with the intramammary antibiotic associated with the internal sealant (Group 3). In the comparison of the results of the CMT test between D-70 and D14, a statistical difference was observed in Groups 2 and 3. Group 3, which comprises the positive teats in D-70 presented a reduction of 83.87% and 32.26% in the CMT test between D-70 and D14. Regarding HK, group 1 and 2 had a statistical difference in relation to group 3 in D-70 and D14. As for the numbers of bacteria isolated in D-70 and D14, there was no difference comparing Group 1 and Group 2, unlike Group 3, which had a difference. Group 1 and Group 2 were all negative teats in D-70, showing that the intramammary antibiotic did not influence the outcome of D14. In group 3 there was a reduction of isolates from 62 to 15 in D14. The most prevalent microorganism was Streptococcus agalactiae with 43.37% of the total isolates, followed by Staphylococcus aureus (16.87%) and Corynebacterium spp. (13.25%) and Coagulase negative Staphylococcus (SCN) (10.84%). The selective treatment of teats in dry dairy cows has advantages over Blanket Dry Cow Therapy by reducing the indiscriminate use of antibiotics, avoiding bacterial resistance, ensuring better milk quality and greater food safety. Antibiotics should only be used for teats with subclinical mastitis, with the microbiological culture at the end of lactation performed by fourth individual mammary.

scholarly journals Temperature rise caused in the pulp chamber under simulated intrapulpal microcirculation with different light-curing modes

2015 ◽  
Vol 85 (3) ◽  
pp. 381-385 ◽  
Author(s):  
Sabri Ilhan Ramoglu ◽  
Hilal Karamehmetoglu ◽  
Tugrul Sari ◽  
Serdar Usumez
Keyword(s):  
Temperature Rise ◽  
Critical Value ◽  
Pulp Chamber ◽  
Group 4 ◽  
Blood Microcirculation ◽  
Light Curing ◽  
Group 3 ◽  
Group 2 ◽  
Labial Surface ◽  
Group 1

ABSTRACT Objective:  To evaluate and compare intrapulpal temperature rise with three different light-curing units by using a study model simulating pulpal blood microcirculation. Materials and Methods:  The roots of 10 extracted intact maxillary central incisors were separated approximately 2 mm below the cement-enamel junction. The crowns of these teeth were fixed on an apparatus for the simulation of blood microcirculation in pulp. A J-type thermocouple wire was inserted into the pulp chamber through a drilled access on the palatal surfaces of the teeth. Four measurements were made using each tooth for four different modes: group 1, 1000 mW/cm2 for 15 seconds; group 2, 1200 mW/cm2 for 10 seconds; group 3, 1400 mW/cm2 for 8 seconds; and group 4, 3200 mW/cm2 for 3 seconds. The tip of the light source was positioned at 2 mm to the incisor's labial surface. Results:  The highest temperature rise was recorded in group 1 (2.6°C ± 0.54°C), followed by group 2 (2.57°C ± 0.62°C) and group 3 (2.35°C ± 0.61°C). The lowest temperature rise value was found in group 4 (1.74°C ± 0.52°C); this value represented significantly lower ΔT values when compared to group 1 and group 2 (P  =  .01 and P  =  .013, respectively). Conclusions:  The lowest intrapulpal temperature rise was induced by 3200 mW/cm2 for 3 seconds of irradiation. Despite the significant differences among the groups, the temperature increases recorded for all groups were below the critical value of 5.6°C.

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