scholarly journals Fracture Resistance of Commonly Used Self-drilling Mini-implants of Various Diameters

2020 ◽  
Vol 54 (1) ◽  
pp. 31-38
Author(s):  
Vinodh S. ◽  
B. Sangamesh ◽  
Neelakantha Patil V. ◽  
Sameer Ahmed ◽  
Venkat Naidu B.
Keyword(s):  
Analysis Of Variance ◽  
Fracture Resistance ◽  
Insertion Torque ◽  
Limited Information ◽  
Mini Implants ◽  
Significant Difference ◽  
Bonferroni Test ◽  
Different Diameters ◽  
Treatment Procedures ◽  
Post Hoc

Context: Self-drilling mini-implants are commonly used in orthodontic treatment procedures, but there is limited information regarding their fracture resistance in areas of high-density bone without predrilling. Aims: The objective of this study is to compare and evaluate the maximum insertion torque and fracture resistance of 3 commonly used self-drilling mini-implants in India, and to assess the influence of variation in diameter in torque generation. Materials and methods: 90 mini-implants from 3 different manufacturers with 2 different diameters were drilled into acrylic blocks using a dial indicating torque screwdriver. All mini-implants were drilled at the rate of 20-30 rotations/min, implants were drilled until they fractured. Torque generated at the point of fracture is shown on the dial of the screwdriver. Measurements of the peak insertion torque value for each manufacturer were recorded separately. Statistical analysis: Analysis of variance, post hoc Bonferroni test. Results: Analysis of variance test showed a significant difference among all the manufacturers in both the diameters with P < .05. Implants of 1.6 mm diameter of Ancer group have the highest fracture resistance value when compared with the same diameter of JJ Orthodontics and SK Surgicals. Implants with higher diameter have more resistance than those with lower diameter. Conclusions: The observed highest fracture resistance is 47 Ncm by Ancer and least fracture resistance is 16 Ncm by JJ Orthodontics. The values are higher than the torque required to place mini-implants intraorally. Ancer mini-implants have the highest peak fracture torque, thus more than SK Surgicals and JJ Orthodontics.

scholarly journals Evaluation of stability of three different mini-implants, based on thread shape factor and numerical analysis of stress around mini-implants with different insertion angle, with relation to en-masse retraction force

2020 ◽  
Vol 25 (6) ◽  
pp. 59-68
Author(s):  
Safiya Sana ◽  
Rekha Reddy ◽  
Ashok Kumar Talapaneni ◽  
Arshad Hussain ◽  
Sayeeda Laegue Bangi ◽  
...  
Keyword(s):  
Shape Factor ◽  
Bone Block ◽  
Mini Implants ◽  
Pull Out ◽  
Significant Difference ◽  
The Stability ◽  
Different Diameters ◽  
Post Hoc ◽  
Retraction Force ◽  
Pull Out Strength

ABSTRACT Objectives: Assess the stability of three different mini-implants, based on thread shape factor (TSF), and evaluate stresses at the mini-implant site and surrounding cortical bone on application of retraction force, at two different insertion angles. Methods: Mini-implants of three different diameters (M1 - Orthoimplant, 1.8mm), (M2 - Tomas, 1.6mm) and (M3 - Vector TAS, 1.4mm) and length of 8mm were used. Using scanning electronic microscopy, the mean thread depth, pitch and relationship between the two (TSF) were calculated. The mini-implants were loaded into a synthetic bone block and the pull-out strength was tested. One way ANOVA and Tukey post-hoc tests were used to compare the pull-out strength of mini-implants. P values < 0.05 were considered statistically significant. Finite element models (FEM) were constructed with insertion angulation at 90° and 60°, with retraction force of 150 g. The results were analyzed using ANSYS software. Results: Statistically significant difference was found among all the three mini-implants for thread depth and pitch (< 0.001). Statistically significant higher pull-out force value was seen for Orthoimplant. The stress distribution level in mini-implant and surrounding bone was observed to be smaller for Orthoimplant. Conclusion: Orthoimplant mini-implants have more favorable geometric characteristics among the three types, and less stress with 90°angulation.

scholarly journals Fracture resistance of immature teeth filled with mineral trioxide aggregate, bioaggregate, and biodentine

2016 ◽  
Vol 10 (02) ◽  
pp. 220-224 ◽  
Author(s):  
Emre Bayram ◽  
Huda Melike Bayram
Keyword(s):  
Fracture Resistance ◽  
Mineral Trioxide Aggregate ◽  
Mean Values ◽  
Root Canals ◽  
Immature Teeth ◽  
Significant Difference ◽  
Group 3 ◽  
Group 2 ◽  
Post Hoc ◽  
Group 1

ABSTRACT Objective: The purpose of this study was to evaluate fracture resistance of teeth with immature apices treated with coronal placement of mineral trioxide aggregate (MTA), bioaggregate (BA), and Biodentine. Materials and Methods: Forty-one freshly extracted, single-rooted human premolar teeth were used for the study. At first, the root length was standardized to 9 mm. The crown-down technique was used for the preparation of the root canals using the rotary ProTaper system (Dentsply Maillefer, Ballaigues, Switzerland) of F3 (30). Peeso reamer no. 6 was stepped out from the apex to simulate an incompletely formed root. The prepared roots were randomly assigned to one control (n = 5) and three experimental (n = 12) groups, as described below. Group 1: White MTA (Angelus, Londrina, Brazil) was prepared as per the manufacturer's instructions and compacted into the root canal using MAP system (Dentsply Maillefer, Ballaigues, Switzerland) and condensed by pluggers (Angelus, Londrina, Brazil). Group 2: The canals were filled with DiaRoot-BA (DiaDent Group International, Canada). Group 3: Biodentine (Septodont, Saint Maur des Fosses, France) solution was mixed with the capsule powder and condensed using pluggers. Instron was used to determine the maximum horizontal load to fracture the tooth, placing the tip 3 mm incisal to the cementoenamel junction. Mean values of the fracture strength were compared by ANOVA followed by a post hoc test. P < 0.05 was considered statistically significant. Results: No significant difference was observed among the MTA, BA, and biodentine experimental groups. Conclusion: All the three materials tested, may be used as effective strengthening agents for immature teeth.

scholarly journals Fracture resistance of simulated immature teeth after apexification with calcium silicate-based materials

2016 ◽  
Vol 10 (02) ◽  
pp. 188-192 ◽  
Author(s):  
Evren Ok ◽  
Mustafa Altunsoy ◽  
Mehmet Tanriver ◽  
Ismail Davut Capar ◽  
Abdussamed Kalkan ◽  
...  
Keyword(s):  
Analysis Of Variance ◽  
Calcium Silicate ◽  
Fracture Resistance ◽  
Composite Resin ◽  
Mineral Trioxide Aggregate ◽  
Control Group ◽  
Fiber Post ◽  
Immature Teeth ◽  
Post Hoc

ABSTRACT Objective: To compare the fracture resistance of simulated immature teeth filled with an apical barrier of mineral trioxide aggregate (MTA), Biodentine, and calcium-enriched mixture (CEM). Materials and Methods: Fifty-two single-rooted human maxillary central incisors were used. For standardization, the teeth were sectioned 6 mm above and 9 mm below the cementoenamel junction to simulate immature apex. Simulations of roots into immature apices were carried out using 1.5 mm diameter drills. The specimens were then randomly divided into three experimental groups (n = 13) and one control group (n = 13). In experimental groups, MTA, Biodentine, and CEM were placed to apical 4 mm of the simulated immature roots. The samples were stored at 37°C and 100% humidity for 1 week. A load was applied on the crown of all teeth at 135° to their long axis until fracture. The data were analyzed using one-way analysis of variance and Tukey post-hoc tests. Results: No statistically significant differences were found among MTA, CEM, and Biodentine (P > 0.05), and these groups demonstrated higher fracture resistance than control group (P < 0.05). Conclusions: Using any of the MTA, Biodentine, and CEM as an apical plug and restoring with fiber post and composite resin increases the fracture resistance of immature teeth.

scholarly journals Knowledge, awareness and preparedness regarding coronavirus disease 2019 pandemic among community pharmacy practitioners working in Kathmandu, Nepal: A pilot study

2020 ◽  
Vol 8 ◽  
pp. 205031212097451
Author(s):  
Sunil Shrestha ◽  
Nisha Jha ◽  
Subish Palaian ◽  
Pathyil Ravi Shankar
Keyword(s):  
Community Pharmacy ◽  
Analysis Of Variance ◽  
Work Experience ◽  
Cross Sectional Study ◽  
Community Pharmacies ◽  
Cross Sectional ◽  
Educational Qualification ◽  
Significant Difference ◽  
Public Health Authorities ◽  
Bonferroni Test

Good knowledge, awareness and preparedness regarding coronavirus disease 2019, among community pharmacy practitioners (CPPs), will enable them to provide correct information and support to patients, convey instructions from the public health authorities and protect their own health. Objective: The aim of this study was to determine knowledge, awareness and preparedness regarding coronavirus disease 2019 among CPPs working in Kathmandu, Nepal. Methods: A cross-sectional study was conducted using a convenience sampling method from 10 February to 25 March 2020. Data were analysed descriptively, and one-sample independent t-test and one-way analysis of variance were used to compare scores among different subgroups of respondents ( p < 0.05). Post hoc analyses (following analysis of variance) were done using the Bonferroni test. Results: A total of 81 CPPs participated. Mean ± standard deviation age was 26.70 ± 5.29 years. Majority of the respondents were male (64.2%). Many CPPs (40.7%) had work experience between 1 and 5 years. Almost half (45.7%) had an educational qualification of Diploma in Pharmacy. Significant differences in knowledge ( p = 0.022) and preparedness ( p < 0.001) were found among individuals with differing levels of work experience. Similarly, a significant difference was found between knowledge-preparedness and work experience ( p = 0.022 and p < 0.001), location of pharmacy ( p < 0.001) and educational qualification ( p = 0.031). Awareness ( p < 0.001) and preparedness scores ( p = 0.049) were different among community pharmacies with the different number of medicines available. Conclusion: Knowledge was found to be higher in CPPs with a work experience of more than 5 years. CPPs working at larger community pharmacies were more aware and prepared. CPPs’ knowledge, awareness and preparedness should be evaluated more widely and strengthened.

scholarly journals Influence of maxillary canine torque variations on the perception of smile esthetics among orthodontists and laypersons

2019 ◽  
Vol 24 (1) ◽  
pp. 53-61 ◽  
Author(s):  
Thiago Correia Barbosa Lemos ◽  
Juliana de Brito Vasconcelos ◽  
Bianca Mota dos Santos ◽  
Andre Wilson Machado
Keyword(s):  
Analysis Of Variance ◽  
T Test ◽  
Test Results ◽  
Maxillary Canine ◽  
Visual Analog Scales ◽  
Significant Difference ◽  
Unpaired Student ◽  
Full Face ◽  
Smile Esthetics ◽  
Post Hoc

ABSTRACT Objective: The purpose of this study was to determine the perception of smile esthetics among orthodontists and laypersons with respect to unilateral maxillary canine torque variations in a frontal smile analysis. Methods: Full face and close-up smile photographs of two subjects (1 man and 1 woman) were used. Both smiles displayed healthy maxillary anterior dentitions. The images were digitally altered to obtain a bilateral 0° torque in the maxillary canines. From this image, unilateral variations of the left canine were made with -15°, -10°, -5°, 0°, +5°, +10° and +15°. Final images were randomly assembled into an album that was given to 53 orthodontists and 53 laypersons. Each rater was asked to evaluate the attractiveness of the images using visual analog scales. Data collected were statistically analyzed with one-way analysis of variance with Tukey post-hoc test and the unpaired Student t test. Results: For orthodontists, most attractive smiles were those with 0°, -5° and -10°. For laypersons, most attractive smiles were those with 0°, -5°, -10°, -15° and + 5°. For both groups, the lowest scores were given for the smiles with +10° and +15° torque. When comparing the perceptions of the orthodontists and laypersons, they did not show statistical differences in most situations. Moreover, in general, there was no significant difference between the full-face and close-up assessments of the smiles. Conclusions: The present findings indicated that smiles with unilateral palatal (negative values) maxillary canine torque variations were more tolerated than smiles with buccal crown torque (positive values) variations.

scholarly journals Efficacy of titanium brush, 915 nm diode laser, citric acid for eradication of Staphylococcus aureus from implant surfaces

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Mohammad Reza Karimi ◽  
Behshad Farkhondemehr ◽  
Motahare Ghaeni Najafi ◽  
Ardavan Etemadi ◽  
Nasim Chiniforush
Keyword(s):  
Staphylococcus Aureus ◽  
Citric Acid ◽  
Diode Laser ◽  
Acid Group ◽  
Negative Control ◽  
Control Groups ◽  
Implant Surface ◽  
Mini Implants ◽  
Significant Difference ◽  
Post Hoc

Abstract Background This study aimed to assess the efficacy of titanium brush, 915 nm diode laser, citric acid and the combination of latter two with titanium brush for decontamination of SLA surface mini-implants. Methods Seventy-five mini-implants contaminated with Staphylococcus aureus (S. aureus) were randomly divided into five experimental groups (n = 12) of titanium brush (TiB), laser, citric acid (CA), brush-laser, and brush-acid, positive [n = 12; chlorhexidine mouthwash (CHX)] and negative [n = 2; phosphate buffered saline (PBS)] control groups and one no-treatment group (n = 1). After counting the colony forming units (CFUs), data were analyzed using the Kruskal–Wallis and Dunn post-hoc tests. Results Regardless of the no-treatment and negative control groups, maximum and minimum CFUs were noted in the titanium brush and positive control groups. After CHX, minimum CFUs were noted in brush-acid group followed by brush-laser, laser, and acid groups. Generally, the Kruskal–Wallis test revealed a significant difference between the groups regarding the colony count (P < 0.001). Dunn post-hoc test showed that the difference between the titanium brush and acid-brush group was significant (P < 0.001) while the differences between the brush and laser groups with the brush-laser group were not significant (P > 0.077). Conclusions Combined use of titanium brush and citric acid yielded superior results compared to other groups in reduction of S. aureus on implant surface.

scholarly journals Impacts of contracted endodontic cavities compared to traditional endodontic cavities in premolars

2020 ◽  
Author(s):  
Xia Juan ◽  
Wang weidong ◽  
Li Zhengmao ◽  
Lin Bingpeng ◽  
Zhang Qian ◽  
...  
Keyword(s):  
Root Canal ◽  
Fracture Resistance ◽  
Testing Machine ◽  
Filling Material ◽  
Root Canal Filling ◽  
Surface Areas ◽  
Significant Difference ◽  
3D Printed ◽  
Post Hoc

Abstract Background: This study aims to compare the percentage of dentin removed, instrumentation efficacy, root canal filling and load at fracture between contracted endodontic cavities, and traditional endodontic cavities on root canal therapy in premolars. Methods: Forty extracted intact human first premolars were imaged with micro-CT and randomly assigned to the contracted endodontic cavity (CEC) or traditional endodontic cavity (TEC) groups. CEC was prepared with the aid of a 3D-printed template, canals were prepared with a 0.04 taper M-Two rotary instrument, and cavities were restored with resin. Specimens were loaded to fracture in an Instron Universal Testing Machine after a fatigue phase. The data were analyzed by the independent samples T test and Mann-Whitney U test, appropriate post hoc tests. Results: In the premolars tested in vitro, the percentage of dentin removed in the premolars with two dental roots in the CEC group (3.85% ± 0.42%) was significantly smaller (P < 0.05) than in the TEC group (4.94% ± 0.5%). The untouched canal wall (UCW) after instrumentation for TECs (16.43% ± 6.56%) was significantly lower (P< .05) than the UCW (24.42% ± 9.19%) for CECs in single-rooted premolars. No significant differences were observed in the increased canal volume and surface areas in premolars between the TEC and CEC groups (P > 0.05). CECs conserved coronal dentin in premolars with two dental roots but no impact on the instrument efficacy. There were no differences between the CEC groups and the TEC groups in the percentage of filling material and voids (P > 0.05). In addition, the mean load at failure of premolars did not significantly differ between the CEC and TEC groups and there was no significant difference in the type of fracture (P > 0.05). Conclusion: The results of this study suggest that CEC could not improve the fracture resistance of the endodontically treated premolars. The instrumentation efficacy and the percentage of filling material did not significantly differ between CECs and TECs in premolars. Keywords: 3D-printed template, contracted endodontic cavities, instrumentation efficacy, root canal filling, fracture resistance

scholarly journals Location of Scoliosis and Postural Reactions Among Girls Aged 7-18 Years

2018 ◽  
Vol 12 (9) ◽  
pp. 19
Author(s):  
Jacek Wilczynski ◽  
Natalia Habik ◽  
Sylwia Janecka ◽  
Przemyslaw Karolak ◽  
Alicja Sliwa ◽  
...  
Keyword(s):  
Analysis Of Variance ◽  
Repeated Measures ◽  
Postural Reactions ◽  
Eyes Closed ◽  
Significant Relationships ◽  
Lateral Curvature ◽  
Bonferroni Test ◽  
Post Hoc ◽  
Ellipse Area ◽  
Selection Of

The objective of the study was evaluation of the relationships between location of scoliosis and postural reactions in girls aged 7-18. The study included 28 girls aged 7-18 with lateral curvature of the spine and scoliotic posture. Selection of the examined girls was targeted. The children were treated in the Inter-School Centre for Corrective and Compensatory Gymnastics in Starachowice. The study was conducted in June 2011. Digital Exhibeon radiograms were applied to determine the location of the curvature. Postural reactions were evaluated using the static-dynamic platform Tecnobody ST 310 Plus Stability System. The variables were verified for normality of the distribution by means of Shapiro-Wilk test. The variability of the quantitative characteristics with respect to categorial characteristics was verified by using one-way and two-way repeated measures ANOVA. In the case of significant main results or interactions, the Bonferroni test and Tukey test were applied as a post hoc analysis. The p values p&lt;0.05 were considered statistically significant. Analysis of variance showed significant relationships between Average Forward-Backward Speed, Perimeter, Ellipse Area in open eyes test (OE), and location of the curvature. The highest amplitudes of the reactions Average Forward-Backward Speer, Perimeter, Ellipse Area in open eyes test (OE) were observed in lumbar curvatures. In examination with eyes closed (CE), a correlation was found between the location of the curvature and Forward-Backward Standard Deviation, Average Forward-Backward Speer, and Perimeter. The highest amplitudes of reactions Average Forward-Backward Speer, Perimeter, Ellipse Area in eyes closed test (CE) were noted also in lumbar curvatures. The comparative analysis of variance of postural reactions with respect to the location of the secondary curvature showed significant results only for Average Forward-Backward Speed (OE). Average Forward-Backward Speed (OE) was the highest in curvatures with thoracic location. 

scholarly journals CBCT assessment of alveolar buccal bone level after RME

2012 ◽  
Vol 83 (1) ◽  
pp. 110-116 ◽  
Author(s):  
Valmy Pangrazio-Kulbersh ◽  
Brynn Jezdimir ◽  
Mariana de Deus Haughey ◽  
Richard Kulbersh ◽  
Paul Wine ◽  
...  
Keyword(s):  
Analysis Of Variance ◽  
Population Sample ◽  
Comprehensive Treatment ◽  
Maxillary Expansion ◽  
Bone Thickness ◽  
Significant Difference ◽  
Bone Level ◽  
Marginal Bone Level ◽  
The Right ◽  
Post Hoc

Abstract Objective: To evaluate the maxillary alveolar buccal bone levels after expansion with banded and bonded expanders, using cone-beam computed tomography (CBCT). Materials and Methods: The population sample consisted of 22 patients who required expansion during their comprehensive treatment; 10 patients (five males and five females) with a mean age of 13.5 years (CVMS 3) had bonded hygienic expanders, and 12 (six males and six females) with a mean age of 12.6 years (CVMS 3) had banded hyrax expanders. CBCT was taken both before (T1) and 6 months after last activation (T2). Measurements were made for buccal bone thickness (BT), buccal marginal bone level (MBL), and bone thickness level (BTL) at the right first molar (MRt), left first molar (MLft), right first premolar (PMRt), and left first premolar (PMLft). A mixed-design analysis of variance assessed differences between and within the groups. Post hoc t-tests were completed on significant analysis of variance results to determine where differences occurred. Results: Analysis of variance revealed no significant differences between or within the two groups. BT significantly decreased horizontally following rapid maxillary expansion. The amount of bone lost was −0.59 mm MRt, −0.72 mm PMRt, −0.50 mm MLft, and −0.57 mm PMLft (P &lt; .003). Conclusions: There was no significant difference between or within the two groups. Buccal bone loss in the vertical dimension (MBL) only showed significance in the banded group for MRt (0.63 mm) and PMLFt (0.37 mm) as evidenced by the paired t-test (P &lt; .05).

Influence of Different Diameters and Materials of Posts on the Fracture Resistance of Endodontically Treated Teeth

2014 ◽  
Vol 633 ◽  
pp. 286-289
Author(s):  
Li Xian Zhang ◽  
Yu Xiao Liu ◽  
Ya Li Liu ◽  
Qiong Rong
Keyword(s):  
Fracture Resistance ◽  
Resistance Testing ◽  
Fiber Post ◽  
Endodontically Treated Teeth ◽  
Significant Difference ◽  
Group A ◽  
Group B ◽  
Different Diameters ◽  
Group D ◽  
Titanium Post

Objective: To evaluate the fracture resistance of endodontically treated teeth reinforced with cast titanium posts and prefabricated glass-fiber posts with different diameters. Materials and Methods: 50 recently extracted human maxillary central incisors were endodontically treated and randomly divided into 5 groups of 10 specimens each: Group A: 1.35mm diameter of cast titanium post; Group B: 1.5mm diameter of cast titanium post; Group C: 1.375mm diameter of prefabricated fiber post; Group D: 1.5mm diameter of prefabricated fiber post; Group E: resin restoration. All specimens were subjected to fracture resistance testing in a universal testing machine, statistical analysis was performed and the fracture modes were analyzed. Results: The mean fracture resistance of five groups as follows: 404.22±73.92N for group A, 488.17±78.68N for group B, 280.32±45.23N for group C, 317.53±50.87N for group D, 222.76±38.67N for group E. The fracture resistance of restored teeth between group C and group D had no significant difference (P>0.05). The fracture resistance of the rest pairwise group comparisons had significant difference (P<0.05). Most of cast post samples fractured at the root middle or apical portion, while most of the fiber post samples fractured at the root cervical or post fracture, which could be retreated. Conclusion: Human maxillary central incisors restored with cast posts could bear higher fracture load and fiber post could protect the root from fracture preferably.

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