scholarly journals Intelligent automation of dental material analysis using robotic arm with Jerk optimized trajectory

2020 ◽  
Vol 11 (12) ◽  
pp. 6223-6234 ◽  
Author(s):  
Robertas Damaševičius ◽  
Rytis Maskeliūnas ◽  
Gintautas Narvydas ◽  
Rūta Narbutaitė ◽  
Dawid Połap ◽  
...  
Keyword(s):  
Dental Materials ◽  
Robotic Arm ◽  
Medium Size ◽  
Robot Arm ◽  
Robotic Platform ◽  
Nsga Ii ◽  
Dental Tissues ◽  
Pareto Optimal Set ◽  
Thermal Wear

AbstractMany types of biomaterial analysis require numerous repetition of the same operations. We suggest applying the principles of Total Laboratory Automation (TLA) for analysis of dental tissues in in-vitro conditions. We propose an innovative robotic platform with ABB high precision industrial robotic arm. We programmed the robot to achieve 3000 cycles of submerging for analysis of the stability and thermal wear of dental adhesive materials. We address the problem of robot trajectory planning to achieve smooth and precise trajectory while minimizing jerk. We generate different variants of trajectory using natural cubic splines and adopt the NSGA II multiobjective evolutionary algorithm to find a Pareto-optimal set of robot arm trajectories. The results demonstrate the applicability of the developed robotic platform for in-vitro experiments with dental materials. The platform is suitable for small or medium size dental laboratories.

Evaluation of Fluoride-Releasing Dental Materials by Means of in Vitro and in Vivo Demineralization Models: Reaction Paper

1995 ◽  
Vol 9 (3) ◽  
pp. 324-331 ◽  
Author(s):  
H. Ralph Rawls
Keyword(s):  
Clinical Efficacy ◽  
Dental Materials ◽  
Model Systems ◽  
Intimate Contact ◽  
Minimum Concentration ◽  
Dental Tissues ◽  
Caries Model ◽  
Target Values

It is essential that we understand the dose-response mechanisms of fluoride delivered intra-orally at sites in intimate contact with dental tissues. Many studies show that extremely low levels of fluoride can inhibit caries. However, few of these studies provide a direct comparison between fluoride release and the inhibition of secondary caries. For this, laboratory, animal, and in situ caries models are required which can predict clinical efficacy. This paper supplements Dr. Erickson's presentation (Erickson and Glasspoole, 1995) by illustrating the adaptation of currently used demineralization and caries models to the development and evaluation of fluoride-containing resin materials. As representative of this class of material, those which release by ion-exchange are reviewed. It is concluded that model systems designed for topical fluorides and non-fluoride dental materials can be adapted for use with fluoride-releasing materials. Further, the use of materials with a long history of clinical efficacy as inhibitors of marginal caries, such as the silicates, is a useful means of determining target values for developing new fluoride-releasing materials. The minimum concentration of F- that must be maintained in the immediate vicinity of a material to provide caries protection at localized sites is not yet known. Nor is it known what combination of release rate, pattern of release, and duration of release is needed to optimize either localized or full-mouth protection. These issues deserve closer examination to aid our understanding of F- action when delivered from dental materials, so that improved caries model systems can be designed for use with dental materials.

scholarly journals Stereomicroscopic analysis of dental materials employed in endodontic exposed to high temperatures

2017 ◽  
Vol 19 (2) ◽  
Author(s):  
Johanna Aramburo ◽  
Angela Zapata ◽  
Sugey Zúñiga ◽  
Freddy Moreno
Keyword(s):  
High Temperatures ◽  
Dental Materials ◽  
In Vitro Study ◽  
Human Teeth ◽  
Great Resistance ◽  
Dental Tissues ◽  
Specific Rank ◽  
Hard Dental Tissues ◽  
Physical Changes

Objective: To describe the physical estereomicroscopical changes that occur in dental tissues and materials employed in a conventional endodontic treatment after application of high temperatures. Materials and methods: An in Vitro study was carried out to observe microscopic, structural and physical changes on hard dental tissues (enamel, dentine and cement) and on endodontic materials (gutta-percha Maillefer Dentsply®, endodontical cement based on oxide of zinc-eugenol Eufar®, cement based on epoxic resin Top Seal® Dentsply®, glass ionomer Fuji I® GC America®, silver amalgam GS80® SDI® and composite Point 4® Kerr®) in 124 human teeth, submitted to five temperature ranks (200ºC, 400ºC, 600ºC, 800ºC, 1000ºC). Results: The studied tissues and dental materials presented great resistance to the high temperatures without varying considerably their micro structure, such as that the physical changes (dimensional stability, cracks, pits, fractures, texture, color, carbonization and incineration) can be observed through estereomicrophotographies and can be associated to each specific rank of temperature. Conclusions: Some macrostructural changes of dental tissues and the dental materials occur of specific form in each rank of temperature, and for this reason they can be employed in the comparison before and postmortem during the process of identification of burned or charred corpse and human remains. Key words: Forensic dentistry, human identification, stereomicroscopy, dental materials, high temperatures.

scholarly journals Macroscopic in vitro analysis of titanium and fiberglass posts cemented in human premolars subjected to high temperatures for forensic purposes

2017 ◽  
Vol 21 (1) ◽  
pp. 12-21 ◽  
Author(s):  
Johanna Aramburo ◽  
Herney Garzón ◽  
Juán Camilo Rivera ◽  
Sebastián Medina ◽  
Freddy Moreno
Keyword(s):  
High Temperatures ◽  
Dental Materials ◽  
Human Teeth ◽  
Dental Tissues ◽  
Gutta Percha ◽  
Vitro Analysis ◽  
Physical Changes ◽  
Study Offer ◽  
In Vitro Analysis

SUMMARYObjective: To describe the macroscopicchanges of titanium and fiberglass postscemented in human premolars subjectedto high temperatures for forensic purposes.Materials and methods: An in Vitro experimentalstudy was conducted to observethe macroscopic physical changes of dentaltissues (enamel, dentine and cement), ofmaterials of conventional endodontic use(gutta-percha Wave One® Maillefer Dentsply®, endodontic cement with epoxic resinTop Seal® Maillefer Dentsply®), postscement Relyx TM ARC 3M ESPE®) andof the titanium posts (Tenax® EndodonticPost System Coltene®) and fiberglassposts (Tenax® Fiber Trans Coltene®) in124 human teeth, exposed to five ranks oftemperature 200ºC, 400ºC, 600ºC, 800ºC,1000ºC (three teeth at each temperature).Results: The studied tissues and dentalmaterials used in this study, offer greatresistance to high temperatures, exhibitingconsiderably variation of their macrostructure,in a way that the physical changes(dimensional stability, fissures, cracks,fractures, texture, color, carbonization andincineration) can serve to identify them andto associate such changes to each rank ofspecific temperature.Conclusion: The titanium and fiberglassposts cemented in human premolars offergreat resistance to the action of high tem-peratures. In the same way, they presentspecific changes associated to the dentaltissues that can contribute with the processof identification and medico-legal necropsyof a corpse or burned, incinerated or carbonizedhuman rests.Key words: Forensic dentistry, humanidentification, dental tissues, dental materials,endodontics, high temperatures.

scholarly journals Micromechanical and Structural Analysis of Compromised Dental Tissues

2005 ◽  
Vol 898 ◽  
Author(s):  
Erin Mahoney ◽  
Nicky Kilpatrick ◽  
Michael Swain
Keyword(s):  
Structural Analysis ◽  
Clinical Outcomes ◽  
Traditional Method ◽  
Dental Materials ◽  
Clinical Approach ◽  
Treatment Technique ◽  
Dental Tissues ◽  
Treatment Techniques ◽  
Materials Research

AbstractWith the continual development of new dental materials and treatment techniques, dental materials research is now more important than ever. Although the traditional method of materials and treatment technique assessment was laboratory based, there is a need for investigations into the clinical outcomes of in-vitro research. The aim of this paper is to discuss the micromechanical and structural analysis of compromised dental tissues that affect young children, using a biomaterial and clinical approach.

The Toxic Effects of Two Dental Materials on Human Buccal Epithelium In Vitro and Monkey Buccal Epithelium In Vivo

1987 ◽  
Vol 14 (3) ◽  
pp. 166-167
Author(s):  
D. Arenholt-Bindslev ◽  
P. Hørsted-Bindslev ◽  
H.P. Philipsen
Keyword(s):  
Dental Materials ◽  
Microscopical Examination ◽  
Buccal Epithelium ◽  
Cytotoxic Effects ◽  
Buccal Epithelial Cells ◽  
Toxicity In Vitro ◽  
Toxic Reactions ◽  
Light Microscopical Examination

The aim of the present study was to compare the toxicity in vitro with the toxicity in vivo of two commercial chemicals marketed for use in the oral cavity (GLUMA BondR and 3M Etching LiquidR). Confluent cultures of human buccal epithelial cells were exposed to graded concentrations of GLUMA Bond or 3M Etching Liquid for 5 minutes. The cytotoxic effects induced by this treatment were observed (cytomorphology, proliferation rate). In vivo, monkey buccal epithelium was exposed to GLUMA Bond or 3M Etching Liquid for 5 minutes. Biopsies were taken after 24 hours, and the buccal epithelium processed for light microscopical examination. In both models, the toxic reactions to GLUMA Bond were far more extensive than those caused by 3M Etching Liquid.

scholarly journals Effect of Cavity Disinfectants on Adhesion to Primary Teeth—A Systematic Review

2021 ◽  
Vol 22 (9) ◽  
pp. 4398
Author(s):  
Ana Coelho ◽  
Inês Amaro ◽  
Ana Apolónio ◽  
Anabela Paula ◽  
José Saraiva ◽  
...  
Keyword(s):  
Primary Teeth ◽  
Clinical Success ◽  
Dental Materials ◽  
In Vitro Study ◽  
In Vitro Studies ◽  
Cochrane Library ◽  
Promising Alternative

Some authors have been proposing the use of cavity disinfectants in order to reduce, or even eliminate, the effect of the microorganisms present in a dental cavity before a restoration is placed. The aim of this study was to evaluate the effect of different cavity disinfectants on bond strength and clinical success of composite and glass ionomer restorations on primary teeth. The research was conducted using Cochrane Library, PubMed/MEDLINE, SCOPUS, and Web of Science for articles published up to February 2021. The search was performed according to the PICO strategy. The evaluation of the methodological quality of each in vitro study was assessed using the CONSORT checklist for reporting in vitro studies on dental materials. Sixteen in vitro studies and one in situ study fulfilled the inclusion criteria and were analyzed. Chlorhexidine was the most studied cavity disinfectant, and its use does not compromise dentin bonding. Sodium hypochlorite is a promising alternative, but more research on its use is required to clearly state that it can safely be used as a cavity disinfectant for primary teeth. Although other disinfectants were studied, there is a low-level evidence attesting their effects on adhesion, therefore their use should be avoided.

In Vitro Zinc-Air Battery Evaluation for Use in Intraoral Medical Devices

2014 ◽  
Vol 8 (1) ◽  
Author(s):  
Miguel Amaral ◽  
Francisco do Vale ◽  
João Silva ◽  
Francisco Caramelo ◽  
Germano Veiga
Keyword(s):  
Medical Devices ◽  
Lithium Batteries ◽  
Artificial Saliva ◽  
Robot Arm ◽  
Climatic Chamber ◽  
Electrical Capacity ◽  
Air Battery ◽  
Different Levels ◽  
Zinc Air Batteries

The aim of the present work was to evaluate the possibility of using zinc-air batteries in intraoral medical devices. We analyzed the electrical behavior of zinc-air batteries when submitted to different levels of temperature, humidity, and limited quantities of air. The experimental setup was divided in three different parts. Firstly, a set of batteries were tested within a climatic chamber and subjected to discharging tests similar to those recommended by the manufacturer. The climatic chamber allowed an accurate variation of humidity and temperature. Secondly, the batteries were placed in a small prototype of intraoral medical device and tested in the absence of air. Lastly, we used a robot arm to repeatedly immerse the prototype in artificial saliva. The results obtained demonstrated the viability of zinc-air batteries as a power solution for intraoral medical devices, as they tolerate high levels of humidity and are capable of working with limited quantities of air. In addition, this kind of battery presents a volume to electrical capacity ratio more than three times higher than lithium batteries, which may open important improvement for powered medical devices.

Characterization of NiCrMo Dental Restoration Alloy

2021 ◽  
Vol 875 ◽  
pp. 373-378
Author(s):  
Ali Haider ◽  
Omar Farooq Azam ◽  
Muhammad Talha ◽  
Saleem Akhtar
Keyword(s):  
Mechanical Properties ◽  
Corrosion Resistance ◽  
Dental Materials ◽  
Dental Restoration ◽  
Restorative Material ◽  
Nicr Alloy ◽  
In Vitro Biocompatibility ◽  
Dental Prostheses ◽  
Materials Used

Restorative material is a class of dental materials used for direct filling and fabrication of indirect restoration. NiCr alloy is a restorative material frequently used for dental prostheses due to its properties and economic reasons. In present work beryllium free NiCrMo alloy was developed and studied for dental restoration application. The alloy have unique characteristics of resistance to oxidation and biocompatibility; the requisites for dental prostheses. NiCrMo alloy is found to possess mechanical strength and fabrication properties suitable for dental repairs. In this study the developed alloy was tested for its mechanical properties, biocompatibility and corrosion resistance. An in-vitro biocompatibility study was carried out. No signs of toxicity and no signs of cell growth inhibition, in presence of NiCrMo alloy specimen, were observed. Mechanical properties and corrosion resistance are found in the range that is suitable for dental prostheses and easy fabrication.

Industrial part localization and grasping using a robotic arm guided by 2D monocular vision

2018 ◽  
Vol 45 (6) ◽  
pp. 794-804 ◽  
Author(s):  
Zhaohui Zheng ◽  
Yong Ma ◽  
Hong Zheng ◽  
Yu Gu ◽  
Mingyu Lin
Keyword(s):  
Camera Calibration ◽  
High Precision ◽  
Calibration Method ◽  
Monocular Vision ◽  
Robotic Arm ◽  
Robot Arm ◽  
Content Type ◽  
Calibration Algorithm ◽  
Target Locating ◽  
Practical Implications

Purpose The welding areas of the workpiece must be consistent with high precision to ensure the welding success during the welding of automobile parts. The purpose of this paper is to design an automatic high-precision locating and grasping system for robotic arm guided by 2D monocular vision to meet the requirements of automatic operation and high-precision welding. Design/methodology/approach A nonlinear multi-parallel surface calibration method based on adaptive k-segment master curve algorithm is proposed, which improves the efficiency of the traditional single camera calibration algorithm and accuracy of calibration. At the same time, the multi-dimension feature of target based on k-mean clustering constraint is proposed to improve the robustness and precision of registration. Findings A method of automatic locating and grasping based on 2D monocular vision is provided for robot arm, which includes camera calibration method and target locating method. Practical implications The system has been integrated into the welding robot of an automobile company in China. Originality/value A method of automatic locating and grasping based on 2D monocular vision is proposed, which makes the robot arm have automatic grasping function, and improves the efficiency and precision of automatic grasp of robot arm.

scholarly journals A Graded Multifunctional Hybrid Scaffold with Superparamagnetic Ability for Periodontal Regeneration

2018 ◽  
Vol 19 (11) ◽  
pp. 3604 ◽  
Author(s):  
Simone Sprio ◽  
Elisabetta Campodoni ◽  
Monica Sandri ◽  
Lorenzo Preti ◽  
Tobias Keppler ◽  
...  
Keyword(s):  
Cell Fate ◽  
Alveolar Bone ◽  
Tape Casting ◽  
Periodontal Regeneration ◽  
Dental Tissue ◽  
Hybrid Scaffold ◽  
Dental Tissues ◽  
Biomineralization Process ◽  
Direct Cell

The regeneration of dental tissues is a still an unmet clinical need; in fact, no therapies have been completely successful in regenerating dental tissue complexes such as periodontium, which is also due to the lack of scaffolds that are able to guide and direct cell fate towards the reconstruction of different mineralized and non-mineralized dental tissues. In this respect, the present work develops a novel multifunctional hybrid scaffold recapitulating the different features of alveolar bone, periodontal ligament, and cementum by integrating the biomineralization process, and tape casting and electrospinning techniques. The scaffold is endowed with a superparamagnetic ability, thanks to the use of a biocompatible, bioactive superparamagnetic apatite phase, as a mineral component that is able to promote osteogenesis and to be activated by remote magnetic signals. The periodontal scaffold was obtained by engineering three different layers, recapitulating the relevant compositional and microstructural features of the target tissues, into a monolithic multifunctional graded device. Physico-chemical, morphological, and ultrastructural analyses, in association with preliminary in vitro investigations carried out with mesenchymal stem cells, confirm that the final scaffold exhibits a good mimicry of the periodontal tissue complex, with excellent cytocompatibility and cell viability, making it very promising for regenerative applications in dentistry.

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