Study on SLM manufacturing of teeth used for dental tools testing

Buican, George Răzvan; Oancea, Gheorghe; Martins, Rui F.

doi:10.1051/matecconf/20179403002

Cited by 9 publications

(7 citation statements)

References 8 publications

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“…, Buican et al . ). SLS printing is used to fabricate metal objects through direct metal laser sintering (DMLS) (Kim et al .…”

Section: Introductionmentioning

confidence: 97%

“…The resin is cured from the bottom, and as a platform moves up, more resin is exposed (van Noort 2012, Kim et al 2016). SLS and SLM printers use a computer-directed laser and roller to distribute layers of powdered material on top of a preceding layer; a solid object takes shape as each new layer is sintered (SLS) or melted (SLM) (van Noort 2012, Torabi et al 2015, Atta 2016, Kim et al 2016, Buican et al 2017. SLS printing is used to fabricate metal objects through direct metal laser sintering (DMLS) (Kim et al 2016).…”

Section: Introductionmentioning

confidence: 99%

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Endodontic applications of 3D printing

Anderson¹,

Wealleans²,

Ray³

2018

Int Endodontic J

139

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Anderson J, Wealleans J, Ray J. Endodontic applications of 3D printing. International Endodontic Journal.Computer-aided design (CAD) and computer-aided manufacturing (CAM) technologies can leverage cone beam computed tomography data for production of objects used in surgical and nonsurgical endodontics and in educational settings. The aim of this article was to review all current applications of 3D printing in endodontics and to speculate upon future directions for research and clinical use within the specialty. A literature search of PubMed, Ovid and Scopus was conducted using the following terms: stereolithography, 3D printing, computer aided rapid prototyping, surgical guide, guided endodontic surgery, guided endodontic access, additive manufacturing, rapid prototyping, autotransplantation rapid prototyping, CAD, CAM. Inclusion criteria were articles in the English language documenting endodontic applications of 3D printing. Fifty-one articles met inclusion criteria and were utilized. The endodontic literature on 3D printing is generally limited to case reports and pre-clinical studies. Documented solutions to endodontic challenges include: guided access with pulp canal obliteration, applications in autotransplantation, pre-surgical planning and educational modelling and accurate location of osteotomy perforation sites. Acquisition of technical expertise and equipment within endodontic practices present formidable obstacles to widespread deployment within the endodontic specialty. As knowledge advances, endodontic postgraduate programmes should consider implementing 3D printing into their curriculums. Future research directions should include clinical outcomes assessments of treatments employing 3D printed objects.

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“…, Buican et al . ). SLS printing is used to fabricate metal objects through direct metal laser sintering (DMLS) (Kim et al .…”

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Endodontic applications of 3D printing

Anderson¹,

Wealleans²,

Ray³

2018

Int Endodontic J

139

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“…Alternatively, HyFlex CM ref. 0.04/20 rotary endodontic fileswith tip's size (diameter) equal to 0.20 mm and taper equal to 0.04, were tested under rotational bending, at a rotational speed of 500 rpm, inside a mandible first molar (Figure 3(a)) that was made in an AISI 316 L stainless steel through selective laser melting (SLM) available on a SLM 250 HL machine (Buican et al, 2017). The mandible first molar represents the type of tooth most commonly subjected to endodontic therapy (Zadik et al, 2008) and a representative in vitro tooth canal could display a primary curvature in the frontal view and a double curvature in the lateral view that is composed by an upper secondary curvature and a tertiary curvature at the apical region (Figure 3(b)) ( Jerome and Hanlon, 2003).…”

Section: Methodsmentioning

confidence: 99%

Fatigue resistance of rotary endodontic files subjected to planar and non-planar curvatures induced by in vitro tooth canals

Martins

Fernandes

Lóios

et al. 2017

IJSI

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Purpose The purpose of this paper is to assess the fatigue life of different sizes of HyFlex CM™ endodontic files when submitted to planar or to non-planar curvatures, and to two different rotational speeds, namely 500 rpm or 250 rpm. The influence of superimposing back and forth motion to rotational bending of endodontic files was also assessed. Design/methodology/approach In all, 64 HyFlex CM™ files of different sizes, namely ref. 0.04/20, 0.06/20, 0.04/35 and 0.06/35, were submitted to rotational bending tests at two different rotational speeds. The planar radius of curvature imposed to the endodontic files was about 4.5 mm, along an angle of 45°, in order to simulate an apical canal that would induce severe loading to the files during clinical treatment. Additionally, 11 Hyflex CM™ files ref. 0.04/20 were submitted to rotational bending tests at 500 rpm inside a mandible first molar manufactured through selective laser melting (SLM), aiming to simulate non-planar curvatures of a real tooth canal. Findings When considering planar curvature, the endodontic file ref. 0.06/20, tested at 250 rpm, has shown the highest fatigue resistance (4,185 revolutions, 1,004 seconds), while the lowest fatigue resistance was registered for instrument ref. 0.04/35 submitted to 500 rpm (747 revolutions, 89 seconds). Hence, depending on the rotational speed, surface finish and the size of the endodontic files tested (taper and tip’s diameter), significant differences in fatigue resistance were noticed. If non-planar curvatures were considered, the minimum fatigue resistance was equal to 107 seconds, and back and forth motion allowed extending the minimum fatigue lifetime to 140 seconds. Originality/value The fatigue resistance of endodontic files is frequently determined through in vitro fatigue tests carried out under single planar curvature or eventually under double planar curvatures. However, non-planar loadings are frequently induced on endodontic instruments when treating root canals with severe multiplanar curvatures. In the research herein presented, a mandible first molar was 3D printed by using the SLM technique in an AISI 316 L stainless steel and more realistic experimental fatigue tests were carried out.

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“…It allowed to change the position of the three pins and to test Ni-Ti wires under several desired strain values. Besides, in order to mimic, as much as possible, a real tooth with a severe non-planar curvature in the apical region, a metallic tooth was recently 3D printed using an SLM additive manufacturing process (Martins et al, 2017;Buican et al, 2017;Loios et al, 2016), and rotary fatigue tests of endodontic files, including pecking motion, were carried out. The experimental apparatus 12,1 used in the paper herein presented was then used to compare the fatigue resistance of endodontic files under a planar constant curvature with the fatigue resistance of endodontic files subjected to a severe non-planar curvature (Martins et al, 2017).…”

Section: Fatigue Resistance Testsmentioning

confidence: 99%

On the fatigue resistance of endodontic files subjected to electrochemical polishing and an autoclave’s sterilisation cycle

Santos

Martins²,

Ginjeira

2020

IJSI

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Purpose The purpose of this paper is to improve the surface finish and, therefore, the fatigue resistance of some endodontic files by electrochemical polishing; the influence of applying an autoclave’s sterilising cycle to the endodontic files under study was also assessed during the research herein presented. Design/methodology/approach In total, 22 Ni-Ti endodontic instruments of two sizes, namely, ref. Hyflex 0.04/20 and 0.06/20 (taper: 0.04; 0.06 and tip diameter: 0.20 mm, respectively), were submitted to rotational bending tests at 500 rpm; the radius and the angle of curvature imposed to the endodontic instruments during the experimental tests were equal to 4.7 mm and 45°, respectively. In addition, 18 endodontic files (out of the 22) were subjected to electrochemical polishing before in vitro fatigue tests had been carried out. Several combinations of electrochemical parameters were considered during the preliminary experiments involving electrolyte, voltage, flow rate and duration. The endodontic files under study were weighted using a high-precision balance before and after polishing, and mass variation was determined. Also, a sterilising cycle was applied to six polished endodontic instruments, which were placed inside an autoclave at 134°C, for 30 min, and under a pressure of 2.16 bar. Findings The fatigue resistance of as-received endodontic files ref. 0.04/20 is much larger (+480 per cent) than the fatigue strength of endodontic files ref. 0.06/20. The weight variation due to electropolishing was comprehended between 0.53 mg and 1.01 mg, and the fatigue resistance of all polished endodontic instruments increased between 30 per cent (0.06/20) and 80 per cent (0.04/20) when compared with the fatigue resistance of the as-received files. The application of an autoclave’s sterilisation cycle had a negative impact on the fatigue resistance of instruments ref. 0.04/20 and a positive impact on the durability of instruments ref. 0.06/20. Originality/value The application of an electrochemical polishing process increased the fatigue resistance of the endodontic files under study significantly, and the values for the variables of the electrochemical process were never published elsewhere. The surface finish improvement was obtained by immersing the endodontic files in a Struers’ Electrolyte (ref. E2) for 3 s while applying 30 volts and a flow rate of 1.

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Study on SLM manufacturing of teeth used for dental tools testing

Cited by 9 publications

References 8 publications

Endodontic applications of 3D printing

Endodontic applications of 3D printing

Fatigue resistance of rotary endodontic files subjected to planar and non-planar curvatures induced by in vitro tooth canals

On the fatigue resistance of endodontic files subjected to electrochemical polishing and an autoclave’s sterilisation cycle

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