scholarly journals Evaluaton of hexagon deformation of dental implant regarding to the insertion force

2017 ◽  
Vol 4 (6) ◽  
pp. 145
Author(s):  
Gustavo Otoboni Molina ◽  
Dimas João Rodrigues Neto ◽  
Marcelo Tomás De Oliveira ◽  
Marcelo Matos Rocha ◽  
Carla Miranda Santana ◽  
...  
Keyword(s):  
Dental Implant ◽  
Insertion Force ◽  
Torque Wrench ◽  
Before And After ◽  
Study Methodology

The aim of this study is to evaluate hexagon deformation of dental implant regarding to the insertion force, verifying the external hexagon platforms before and after each torque performed. Thereunto, 25 implants were selected and divided into 5 groups with 5 implants each one; every group received different torque 10N, 20N, 30N, 40N and 100N. A Surgical torque wrench was used, with the implant installation key, what established the insertion force for each group. The platform measurements were carried out before and after apply the torque by analyses of images acquired through implant platforms. We conclude, by this study methodology, 100N forces were able to cause changes on hexagon dimensions; however, it did not damage the prosthesis platform adaptation.

Maximum Bite Force of Edentulous Patients before and after Dental Implant Rehabilitation: Long-Term Follow-Up and Facial Type Influence

2016 ◽  
Vol 27 (6) ◽  
pp. 523-527 ◽  
Author(s):  
Ana Cláudia M. Melo ◽  
Ingrid M. Ledra ◽  
Rogéria A. Vieira ◽  
Edivaldo R. Coró ◽  
Ivete Aparecida de M. Sartori
Keyword(s):  
Dental Implant ◽  
Bite Force ◽  
Before And After ◽  
Long Term Follow Up ◽  
Edentulous Patients ◽  
Facial Type

scholarly journals Antimicrobial Prescription Habits of Dentists Performing Dental Implant Treatments in Santo Domingo, Dominican Republic

Antibiotics ◽  
2020 ◽  
Vol 9 (7) ◽  
pp. 376
Author(s):  
Juan Manuel Aragoneses ◽  
Javier Aragoneses ◽  
Vanessa Arlette Brugal ◽  
Juan Algar ◽  
Ana Suarez
Keyword(s):  
Dominican Republic ◽  
Dental Implant ◽  
Preoperative Period ◽  
Santo Domingo ◽  
Recommended Dosage ◽  
Self Assessment ◽  
Cross Sectional ◽  
Before And After ◽  
The Subject ◽  
Antimicrobial Prescription

The use of antibiotics in implant treatments is controversial. The purpose of this research was to study the behaviors of Santo Domingo dentists who prescribe antimicrobials to patients for the placement of dental implants. A total of 99 dentists participated in the study. A share of 1.2% of dentists prescribed antimicrobials solely in the preoperative period, 8.6% after surgery, 44.4% before and after, 19.8% only in specific situations, and 25.9% did not prescribe at all. Amoxicillin was the predominant antimicrobial of choice. A cross-sectional, observational, survey-based study was conducted. The items studied were demographics, self-assessment of knowledge about antibiotics and when they are used, as well as their recommended dosage and duration, in healthy and non-allergic patients. Notable variability was found in the prescription behaviors of antimicrobials. Bridging gaps in knowledge on the subject could help to standardize prescription guidelines.

scholarly journals Preparation of Bioactive Titanium Surfaces via Fluoride and Fibronectin Retention

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
Carlos Nelson Elias ◽  
Patricia Abdo Gravina ◽  
Costa e Silva Filho ◽  
Pedro Augusto de Paula Nascente
Keyword(s):  
Dental Implants ◽  
Dental Implant ◽  
Osteoblastic Cells ◽  
Acid Etching ◽  
Implant Surface ◽  
Force Microscopy ◽  
Dental Implant Surface ◽  
Before And After ◽  
Titanium Surfaces

Statement of Problem. The chemical or topographic modification of the dental implant surface can affect bone healing, promote accelerated osteogenesis, and increase bone-implant contact and bonding strength.Objective. In this work, the effects of dental implant surface treatment and fibronectin adsorption on the adhesion of osteoblasts were analyzed.Materials and Methods. Two titanium dental implants (Porous-acid etching and PorousNano-acid etching followed by fluoride ion modification) were characterized by high-resolution scanning electron microscopy, atomic force microscopy, and X-ray diffraction before and after the incorporation of human plasma fibronectin (FN). The objective was to investigate the biofunctionalization of these surfaces and examine their effects on the interaction with osteoblastic cells.Results. The evaluation techniques used showed that the Porous and PorousNano implants have similar microstructural characteristics. Spectrophotometry demonstrated similar levels of fibronectin adsorption on both surfaces (80%). The association indexes of osteoblastic cells in FN-treated samples were significantly higher than those in samples without FN. The radioactivity values associated with the same samples, expressed as counts per minute (cpm), suggested that FN incorporation is an important determinant of thein vitrocytocompatibility of the surfaces.Conclusion. The preparation of bioactive titanium surfaces via fluoride and FN retention proved to be a useful treatment to optimize and to accelerate the osseointegration process for dental implants.

scholarly journals Measuring the Safety Effect of Raised Bicycle Crossings Using a New Research Methodology

1998 ◽  
Vol 1636 (1) ◽  
pp. 64-70 ◽  
Author(s):  
Per Gårder ◽  
Lars Leden ◽  
Urho Pulkkinen
Keyword(s):  
Bayesian Approach ◽  
Research Methodology ◽  
Accident Analysis ◽  
Traffic Calming ◽  
Expert Model ◽  
Before And After ◽  
Study Methodology ◽  
Safety Effect ◽  
New Research ◽  
Before And After Study

Before-and-after study methodology was developed and applied to evaluating the effect on bicyclists’ safety of raising urban bicycle crossings by 4 to 12 cm. In total, 44 junctions were reconstructed in this way in Gothenburg, Sweden. Four of these were studied in detail. Before the implementations, bicyclists were riding either in the roadway or on separate paths parallel to the roadway. The paths then ended with short ramps or curb cuts at each cross street, and bicyclists used nonelevated, marked bicycle crossings, similar to pedestrian crosswalks but delineated by white painted rectangles rather than zebra stripes. The results show that the paths with raised crossings attracted more than 50 percent more bicyclists and that the safety per bicyclist was improved by approximately 20 percent due to the increase in bicycle flow, and with an additional 10 to 50 percent due to the improved layout. However, the increased bicyclist volume means that the total number of bicycle accidents is expected to increase. Besides accident analysis, the change in risk was estimated using four different methods: surveys of bicyclists and experts, respectively; conflict data; and a quantitative expert model. Using a Bayesian approach for combining the results shows that the most likely effect of raising the bicycle crossing is a risk reduction of around 30 percent, compared with the before situation with a conventional bicycle crossing. Motorists and pedestrians also saw safety benefits from this traffic-calming measure.

Study of Insertion Force and Deformation for Suturing With Precurved NiTi Guidewire

2015 ◽  
Vol 137 (4) ◽  
Author(s):  
Yancheng Wang ◽  
Roland K. Chen ◽  
Bruce L. Tai ◽  
Kai Xu ◽  
Albert J. Shih
Keyword(s):  
Experimental Study ◽  
Minimally Invasive ◽  
Ex Vivo ◽  
Nickel Titanium ◽  
Small Radius ◽  
Radius Of Curvature ◽  
Large Radius ◽  
Position Measurement ◽  
Insertion Force ◽  
Before And After

This research presents an experimental study evaluating stomach suturing using a precurved nickel–titanium (NiTi) guidewire for an endoscopic minimally invasive obesity treatment. Precise path planning is critical for accurate and effective suturing. A position measurement system utilizing a hand-held magnetic sensor was used to measure the shape of a precurved guidewire and to determine the radius of curvature before and after suturing. Ex vivo stomach suturing experiments using four different guidewire tip designs varying the radius of curvature and bevel angles were conducted. The changes in radius of curvature and suturing force during suturing were measured. A model was developed to predict the guidewire radius of curvature based on the measured suturing force. Results show that a small bevel angle and a large radius of curvature reduce the suturing force and the combination of small bevel angle and small radius of curvature can maintain the shape of guidewire for accurate suturing.

Effect of activation rate on output torque values from a dental implant toggle-style torque wrench

2021 ◽  
Author(s):  
Chandur P.K. Wadhwani ◽  
William T. Frantz ◽  
Todd R. Schoenbaum ◽  
Paul S. Rosen ◽  
Darren Nhan ◽  
...  
Keyword(s):  
Dental Implant ◽  
Output Torque ◽  
Activation Rate ◽  
Torque Wrench ◽  
Torque Values

Does Abutment Collar Length Affect Abutment Screw Loosening After Cyclic Loading?

2015 ◽  
Vol 41 (S1) ◽  
pp. 346-351 ◽  
Author(s):  
Hakimeh Siadat ◽  
Salma Pirmoazen ◽  
Elaheh Beyabanaki ◽  
Marzieh Alikhasi
Keyword(s):  
Cyclic Loading ◽  
Paired Comparison ◽  
Acrylic Resin ◽  
Screw Loosening ◽  
Ridge Augmentation ◽  
Torque Wrench ◽  
Before And After ◽  
Torque Loss ◽  
One Way Anova ◽  
Abutment Screw

A significant vertical space that is corrected with vertical ridge augmentation may necessitate selection of longer abutments, which would lead to an increased vertical cantilever. This study investigated the influence of different abutment collar heights on single-unit dental implant screw-loosening after cyclic loading. Fifteen implant-abutment assemblies each consisted of an internal hexagonal implant were randomly assigned to 3 groups: Group1, consisting of 5 abutments with 1.5 mm gingival height (GH); Group2, 5 abutments with 3.5 mm GH; and Group3, 5 abutments with 5.5 mm GH. Each specimen was mounted in transparent auto-polymerizing acrylic resin block, and the abutment screw was tightened to 35 Ncm with an electric torque wrench. After 5 minutes, initial torque loss (ITL) was recorded for all specimens. Metal crowns were fabricated with 45° occlusal surface and were placed on the abutments. A cyclic load of 75 N and frequency of 1 Hz were applied perpendicular to the long axis of each specimen. After 500 000 cycles, secondary torque loss (STL) was recorded. One-way ANOVA analysis was used to evaluate the effects of abutment collar height before and after cyclic loading. One-way ANOVA showed that ITL among the groups was not significantly different (P = .52), while STL was significantly different among the groups (P = .008). Post-hoc Tukey HSD tests showed that STL values were significantly different between the abutments with 1.5 mm GH (Group1) and with 5.5 mm GH (Group3) (P = .007). A paired comparison t-test showed that cyclic loading significantly influenced the STL in comparison with the ITL in each group. Within the limitations of this study, it can be concluded that increase in height of the abutment collar could adversely affect the torque loss of the abutment screw.

PATIENT ATTITUDES BEFORE AND AFTER DENTAL IMPLANT REHABILITATION

1994 ◽  
Vol 3 (2) ◽  
pp. 106-110 ◽  
Author(s):  
Thomas J. Balshi ◽  
Glenn J. Wolfinger ◽  
Ramon E. Hernandez
Keyword(s):  
Dental Implant ◽  
Patient Attitudes ◽  
Before And After

Electrochemical behavior of dental implant system before and after clinical use

2009 ◽  
Vol 19 (4) ◽  
pp. 846-851 ◽  
Author(s):  
Chae-Heon CHUNG ◽  
Hee-Jung KIM ◽  
Yong-Tae JEONG ◽  
Mee-Kyoung SON ◽  
Yong-Hoon JEONG ◽  
...  
Keyword(s):  
Dental Implant ◽  
Electrochemical Behavior ◽  
Clinical Use ◽  
Before And After ◽  
Implant System

scholarly journals Implant Volume Loss, Misfit, Screw Loosening, and Stress In Custom Titanium and Zirconia Abutments

2020 ◽  
Vol 31 (4) ◽  
pp. 374-379
Author(s):  
Sales Antônio Barbosa Jr ◽  
Ataís Bacchi ◽  
Valentim Adelino Ricardo Barão ◽  
Yara Teresinha Corrêa Silva-Sousa ◽  
João Felipe Bruniera ◽  
...  
Keyword(s):  
Stress Distribution ◽  
Repeated Measures ◽  
Titanium Implants ◽  
Volume Loss ◽  
Screw Loosening ◽  
Mechanical Cycling ◽  
Torque Wrench ◽  
Significant Difference ◽  
Before And After ◽  
Cad Cam

Abstract The aim of this study was to verify the effect of the implant volume loss, vertical misfit between abutment and prosthetic platform, prosthetic screw loosening torque, and screw stress distribution in titanium and zirconia abutments. Ten CAD/CAM system custom abutments of each material were milled and attached to the titanium implants. The implant volume loss was evaluated by microtomography, the vertical misfit with optical microscopy, and digital torque wrench measured the prosthetic screw loosening. All experimental analyses were performed before and after mechanical cycle (1,000,000 cycles, 100 N/2 Hz). Virtual models of the structures were created for finite element analysis, and the stress on the screw obtained with von Mises procedure. Data were analyzed using an independent t-test, two-way ANOVA for repeated measures, and Tukey’s HSD test (a=0.05). There was no significant difference in the implant volume loss for the two abutment materials (p=0.662). Titanium abutments provided higher loosening torque values after mechanical cycling (p<0.001). Lesser marginal misfit was obtained with titanium abutments before and after mechanical cycling (p<0.001). The stress distribution on the screw was similar between abutment materials. In conclusion, CAD/CAM custom titanium abutment reduced the marginal misfit and increased the torque maintenance of prosthetic screws when compared to CAD/CAM custom zirconia abutment.

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