scholarly journals Fully-customized distraction assembly for maxillofacial distraction osteogenesis: a novel device and its experimental accuracy verification

2020 ◽  
Vol 16 (1) ◽  
Author(s):  
Sang-Hoon Kang ◽  
Hye-Jin Tak ◽  
Ha-Won Park ◽  
Jin-Ung Kim ◽  
Sang-Hwy Lee
Keyword(s):  
Distraction Osteogenesis ◽  
Reference Points ◽  
Assembly System ◽  
Control Group ◽  
Novel Device ◽  
Mandibular Distraction Osteogenesis ◽  
Distraction Device ◽  
Cad Cam ◽  
3D Printed ◽  
Group 1

Abstract Background A new distraction osteogenesis assembly system comprising a fully customized CAD/CAM-based fixation unit and ready-made distraction unit was developed. The aim of this study was to introduce our new distraction system and to evaluate its accuracy level in a sampled mandibular distraction osteogenesis. Methods Our system consists of a fully customized CAD/CAM-based fixation plate unit with two plates for each moving and anchoring part, and a ready-made distraction unit with attachment slots for fixation plates. The experimental distractions were performed on 3D-printed mandibles for one control and two experimental groups (N = 10 for each group). All groups had reference bars on the chin region and teeth to measure distraction accuracy. The control group had the classical ready-made distraction system, and experimental groups 1 and 2 were fitted with our new distraction assembly using a different distractor-positioning guide design. All distracted experimental mandibles were scanned by CT imaging, then superimposed on a 3D simulation to get their discrepancy levels. Results The measured 3D distances between the reference landmarks of the surgical simulations and the experimental surgeries for the three groups were significantly different (p < 0.0001) by statistical analysis. The errors were greater in the control group (with a total average of 19.18 ± 3.73 mm in 3D distance between the simulated and actual reference points) than those in the two experimental groups (with an average of 3.68 ± 1.41 mm for group 1 and 3.07 ± 1.39 mm for group 2). The customized distraction assembly with 3D-printed bone plate units in group 1 and 2, however, did not show any significant differences between simulated and actual distances (p > 0.999). Conclusion Our newly-developed distraction assembly system with CAD/CAM plate for the distraction osteogenesis of the mandible produced a greater level of accuracy than that of a conventional distraction device. The system appears to address existing shortcomings of conventional distraction devices, including inaccuracy in vector-controlled movement of the system. However, it also needs to be further developed to address the requirements and anatomical characteristics of specific regions.

Design and Feasibility Testing of a Novel Device for Automatic Distraction Osteogenesis of the Mandible

2004 ◽  
Author(s):  
Nathan B. Crane ◽  
J. Michael Gray ◽  
Sarah E. Mendelowitz ◽  
Jason W. Wheeler ◽  
Alexander H. Slocum
Keyword(s):  
Distraction Osteogenesis ◽  
Medical Procedure ◽  
Force Output ◽  
Mandibular Distraction ◽  
Novel Device ◽  
Mandibular Distraction Osteogenesis ◽  
Distraction Device ◽  
Coupling System ◽  
Transmission Length ◽  
The Impact

Mandibular distraction osteogenesis is a medical procedure for lengthening the mandible bone by stimulating natural bone-healing mechanisms via a mechanical device that exerts a force on the mandible in one or more directions. Many mandibular distraction devices must be placed externally and most rely on the patient to manually actuate the device each day. This project focuses on the design of an automatically actuated, single degree-of-freedom, implantable distraction device that would be minimally visible after installation. Such a device could reduce errors from patient compliance and would be an important first step toward increasing the capability of future devices. A simple motor and leadscrew system was used with a custom designed impact transmission and controller. A test was conducted on a prototype to determine the feasibility of the design and measure the overall system efficiency. The device was able to move the required 70 N load at a rate of about 1 mm per minute. Compared to an equivalent device utilizing a planetary gearhead to amplify the torque, the impact coupling is significantly less efficient. However, the necessary increase in battery size has only a small impact on the total device length. For a system with the same motor and force output, the impact coupling system is shorter than the gearhead-based system due to a 50% reduction in transmission length.

A Custom-Made Distraction Device for Experimental Mandibular Distraction Osteogenesis

2005 ◽  
Vol 16 (4) ◽  
pp. 675-683 ◽  
Author(s):  
Muhitdin Eski ◽  
Mustafa Nisanci ◽  
Yakup Cil ◽  
Mustafa ??engezer ◽  
Ayhan ??zcan
Keyword(s):  
Distraction Osteogenesis ◽  
Mandibular Distraction ◽  
Mandibular Distraction Osteogenesis ◽  
Distraction Device ◽  
Custom Made

scholarly journals Influence of time and hydration (ageing) on flexural strength of Yttrium stabilized Zirconia polycrystals (Y-TZP) fabricated with different CAD-CAM Systems

2021 ◽  
Vol 37 (3) ◽  
Author(s):  
Khulud A Al Aali ◽  
Saad Alresayes ◽  
Aasem M Alhenaki ◽  
Fahim Vohra ◽  
Tariq Abduljabbar
Keyword(s):  
Flexural Strength ◽  
Testing Machine ◽  
Control Group ◽  
Stabilized Zirconia ◽  
Cad Cam ◽  
Group 3 ◽  
Group 2 ◽  
Cam Systems ◽  
Ageing Duration ◽  
Group 1

Objectives: To evaluate the effect of time and hydration (ageing) on flexural strength of yttrium-stabilized zirconia polycrystals (Y-TZP) zirconia fabricated from three different materials. Methods: This in-vitro study was performed from June to September 2019. Y-TZP bars, measuring 2 x 3 x 20 mm were prepared and sintered from three different materials, Group-1: LAVA™ Zirconia (3M™ ESPE, US) (control) Group-2: Vita In-Ceram YZ (VITA, Germany) and Group-3: Aadva™ Zirconia (Zr) (GC Advanced technologies Inc.). 30 zirconia bars per group were prepared using sectioning of blocks with isomet saw. Followed by sintering in furnaces for recommended temperature cycles. One side of bars were polished and beveled for flexural testing. Groups of specimens were divided into subgroups of 3 (n=10) based on the ageing (distilled water in the incubator at 37ºC) durations (48 Hrs and two and half years). Ten specimens in each material groups were not aged (controls). Samples were exposed to a static force in a three-point bend test using a universal instron-testing machine until fracture. Scanning electron microscopic assessment was performed for fractured specimens for ageing. Data was analyzed using ANOVA and Tukey post hoc test. Results: The mean flexural strength at baseline for Group-1: LAVA™ Zirconia, group (632.7 ± 136.5 MPa) 2: Vita In-Ceram YZ (1036.3 ± 229.6 MPa), and Group-3: Aadva™ Zirconia (1171.3 ± 266.3 MPa) were significantly different. Group-2 and Group-3 specimens showed higher strength compared to Group-1 specimens, irrespective of the ageing duration (p<0.05). Analysis of pooled data for flexural strength for materials by aging period (baseline, after 48 hours and after 2 and ½ years) showed that there was significant reduction of strength with increasing duration (p<0.05). Conclusions: Y-TZP showed variations in flexural strength depending on the material type. Ageing duration exhibited significant influence on the flexural strength of Y-TZP when comparing no ageing to two and half years. Vita In-Ceram YZ and Aadva Zirconia (Zr) showed higher and clinically acceptable flexural strength outcomes. doi: https://doi.org/10.12669/pjms.37.3.3996 How to cite this:Al-Aali KA, Alresayes S, Alhenaki AM, Vohra F, Abduljabbar T. Influence of time and hydration (ageing) on flexural strength of Yttrium stabilized Zirconia polycrystals (Y-TZP) fabricated with different CAD-CAM Systems. Pak J Med Sci. 2021;37(3):---------.   doi: https://doi.org/10.12669/pjms.37.3.3996 This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Continuous Mandibular Distraction Osteogenesis: Novel Device and Preliminary Results in Minipigs

2013 ◽  
Vol 71 (4) ◽  
pp. e168-e177 ◽  
Author(s):  
Batya R. Goldwaser ◽  
John Magill ◽  
Maria E. Papadaki ◽  
Martyn Byl ◽  
Roger Kromann ◽  
...  
Keyword(s):  
Distraction Osteogenesis ◽  
Mandibular Distraction ◽  
Preliminary Results ◽  
Novel Device ◽  
Mandibular Distraction Osteogenesis

scholarly journals Torque Mechanical Evaluation for 3D Printed Orthodontic Springs with Different Parameters: Invitro Study

2020 ◽  
Author(s):  
Ahmed Othman ◽  
Steven Hartman ◽  
Dragan Ströbele ◽  
Jassin Arnold ◽  
Constantin von See
Keyword(s):  
Testing Machine ◽  
Control Group ◽  
3D Printer ◽  
Coil Design ◽  
Flexible Material ◽  
Universal Testing ◽  
Length Group ◽  
Cad Cam ◽  
3D Printed ◽  
Sydney Australia

Abstract Background: The purpose of the presented investigation is to evaluate the resulting torque on loaded 3D printed springs using different coil thickness and length. Methods: Specimens were designed and printed using the 3D printer MAX (Asiga, Sydney, Australia) with 3D printable, experimental, flexible material (Code:BM2008, GC, Tokyo, Japan). The specimens were divided into three groups according to spring coil design. Control group (n=18), length group (n=19) and thickness group (n=22). Groups were tested using a Sauter Machine for torque calculation (DB, Grindelwald, Switzerland) in conjunction with a universal testing machine (Zwick Z010, Ulm, Germany) for clock-wise and anti-clockwise testing. Statistical analysis was performed using the Steel-Dwass test to compare median values of the three groups in both testing directions (p<0.001). Results: The highest torque value was determined in the thickness group for both clockwise and anti-clockwise testing directions, achieving 44.00N/mm and 39.62N/mm respectively. For the thickness group values ranged from 21.28N/mm anti-clockwise to 44.00N/mm clockwise. The length group ranged from 21.65N/mm to 11.04N/mm in clockwise direction and from 18.04N/mm to 11.38N/mm in counter-clockwise testing. The control group ranged from 22.72N/mm to 17.18N/mm in the clock-wise direction while in the anti-clock wise testing it ranged from 21.34N/mm to 16.02N/mm. Conclusions: 3D printed springs are being affected by diameter than length as a design parameter compared to the control group. The thickness group values are statistically significant than the length group (P<0.001). Key words: CAD/CAM, 3D printing, Digital Orthodontics, Torque, Springs.

scholarly journals Evaluation of the Color Stability of 3D-Printed Crown and Bridge Materials against Various Sources of Discoloration: An In Vitro Study

Materials ◽  
2020 ◽  
Vol 13 (23) ◽  
pp. 5359
Author(s):  
Ji-Won Shin ◽  
Jong-Eun Kim ◽  
Young-Jin Choi ◽  
Seung-Ho Shin ◽  
Na-Eun Nam ◽  
...  
Keyword(s):  
3D Printing ◽  
Computer Aided Design ◽  
Color Change ◽  
Color Stability ◽  
Control Group ◽  
Water Control ◽  
Storage Duration ◽  
Computer Aided ◽  
Cad Cam ◽  
3D Printed

Recent advances in three-dimensional (3D) printing have introduced new materials that can be utilized for dental restorations. Nonetheless, there are limited studies on the color stability of restorations using 3D-printed crowns and bridge resins. Herein, the color stability of conventional computer-aided design/computer-aided manufacturing (CAD/CAM) blocks and 3D-printing resins was evaluated and assessed for their degrees of discoloration based on material type, colorant types (grape juice, coffee, curry, and distilled water (control group)), and storage duration (2, 7, and 30 days) in the colorants. Water sorption, solubility, and scanning electron microscope (SEM) analyses were conducted. A three-way ANOVA analysis showed that all three factors significantly affected the color change of the materials. Notably, the discoloration (ΔE00) was significantly higher in all 3D printing resins (4.74–22.85 over the 30 days) than in CAD/CAM blocks (0.64–4.12 over the 30 days) following immersion in all colorants. 3D-printing resins showed color differences above the clinical limit (2.25) following storage for 7 days or longer in all experimental groups. Curry was the most prominent colorant, and discoloration increased in almost all groups as the storage duration increased. This study suggests that discoloration must be considered when using 3D printing resins for restorations.

An Implantable Battery System for a Continuous Automatic Distraction Device for Mandibular Distraction Osteogenesis

2010 ◽  
Vol 4 (4) ◽  
Author(s):  
M. D. Chung ◽  
R. D. Rivera ◽  
S. E. Feinberg ◽  
A. M. Sastry
Keyword(s):  
Distraction Osteogenesis ◽  
Structural Design ◽  
Control Algorithm ◽  
Lithium Ion ◽  
Osteotomy Site ◽  
New Bone Formation ◽  
Selection Algorithm ◽  
Battery System ◽  
Mandibular Distraction Osteogenesis ◽  
Distraction Device

Distraction osteogenesis is a method of generating new bone formation by the gradual application of tensile stress across an osteotomy site (a complete cut through the bone). Internal or intraoral distraction devices have become the most common clinical apparatus in craniofacial distraction osteogenesis, although actuating the distraction devices relies upon manual length adjustment under patients’ compliance, introducing inconvenience and potential error in the procedure. To realize a fully implantable automatic distraction device, we propose a device design comprising a continuous miniature motor-driven distractor with a controller and an on-board lithium-ion battery. A benchtop prototype was fabricated to demonstrate the device’s structural design capable of transmitting sufficient loads with sufficient strain accuracy; it is capable of using a battery selection algorithm to determine an appropriate electrochemistry, temperature, sealability, and form factor and a control algorithm and a testing protocol with a laboratory-fabricated control circuit. This new distraction osteogenesis device enables completely automated and continuous distraction by the application of a low strain magnitude with multiple steps potentially leading to enhanced osteogenic activity.

scholarly journals Sinus Lift and Implant Insertion on 3D-Printed Polymeric Maxillary Models: Ex Vivo Training for In Vivo Surgical Procedures

2021 ◽  
Vol 10 (20) ◽  
pp. 4718
Author(s):  
Diana Florina Nica ◽  
Alin Gabriel Gabor ◽  
Virgil-Florin Duma ◽  
Vlad George Tudericiu ◽  
Anca Tudor ◽  
...  
Keyword(s):  
Ex Vivo ◽  
Control Group ◽  
Training Procedure ◽  
Sinus Augmentation ◽  
Area Of Interest ◽  
Dental Practitioners ◽  
3D Printed ◽  
Group 2 ◽  
Group 1

Background and Objectives: The aim of this study is to demonstrate the increased efficiency achieved by dental practitioners when carrying out an ex vivo training process on 3D-printed maxillaries before performing in vivo surgery. Materials and Methods: This developed ex vivo procedure comprises the following phases: (i) scanning the area of interest for surgery; (ii) obtaining a 3D virtual model of this area using Cone Beam Computed Tomography (CBCT); (iii) obtaining a 3D-printed model (based on the virtual one), on which (iv) the dental practitioner simulates/rehearses ex vivo (most of) the surgery protocol; (v) assess with a new CBCT the 3D model after simulation. The technical steps of sinus augmentation and implant insertion could be performed on the corresponding 3D-printed hemi-maxillaries prior to the real in vivo surgery. Two study groups were considered, with forty patients divided as follows: Group 1 comprises twenty patients on which the developed simulation and rehearsal procedure was applied; Group 2 is a control one which comprises twenty patients on which similar surgery was performed without this procedure (considered in order to compare operative times without and with rehearsals). Results: Following the ex vivo training/rehearsal, an optimal surgery protocol was developed for each considered case. The results of the surgery on patients were compared with the results obtained after rehearsals on 3D-printed models. The performed quantitative assessment proved that, using the proposed training procedure, the results of the in vivo surgery are not significantly different (p = 0.089) with regard to the ex vivo simulation for both the mezio-distal position of the implant and the distance from the ridge margin to sinus window. On the contrary, the operative time of Group 1 was reduced significantly (p = 0.001), with an average of 20% with regard to in vivo procedures performed without rehearsals (on the control Group 2). Conclusions: The study demonstrated that the use of 3D-printed models can be beneficial to dental surgeon practitioners, as well as to students who must be trained before performing clinical treatments.

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