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KJO Korean Journal of Orthodontics

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pISSN 2234-7518
eISSN 2005-372X
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Korean J Orthod   

First Published Date October 17, 2022

Copyright © The Korean Association of Orthodontists.

Retentive strength of orthodontic brackets bonded to 3D-printed vs. milled materials after surface treatment and aging

Ameer Biadsee DMD MHA a, Ofir Rosner DMD b, Carol Khalil c, Vanina Atanasova DMD d, Joel Blushtein DMD e ,Shifra Levartovsky DMD f

a Post-graduate student, department of Oral Rehabilitation, Maurice and Gabriela Goldschleger School of Dental Medicine, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv 6997801, Israel
b Clinical instructor, department of Oral Rehabilitation, Maurice and Gabriela Goldschleger School of Dental Medicine, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv 699780, Israel.
c Under-graduate student, Maurice and Gabriela Goldschleger School of Dental Medicine, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv 6997801, Israel.
d Post-graduate student, department of Orthodontics, The Maurice and Gabriela Goldschleger School of Dental Medicine, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv 6997801, Israel.
e Clinical instructor, department of Orthodontics, The Maurice and Gabriela Goldschleger School of Dental Medicine, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv 6997801, Israel.
f Senior lecturer, department of Oral Rehabilitation, Maurice and Gabriela Goldschleger School of Dental Medicine, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv 699780, Israel.

Correspondence to:Ameer Biadsee,
Department of Oral Rehabilitation
The Maurice and Gabriela Goldschleger School of Dental Medicine
Tel Aviv University, Klatchkin 4
Tel Aviv 69978 Israel
Tel: +972-525833906
Email: Ameerb@mail.tau.ac.il

Abstract

Objective: The purpose of this study to evaluate the shear bond strength (SBS) of orthodontic brackets bonded to 3D-printed material after various surface treatments and aging in comparison to CAD-CAM polymethyl methacrylate (PMMA) milled material.
Methods: Eighty cylindrical specimens were 3D-printed and divided into 4 subgroups (n=20 each) according to the surface treatment and ageing procedure. Group A: sandblasted with 50 μm aluminum oxide particles (SA) and aging; Group B: sandblasted with 30 μm silica-coated alumina particles (CO) and aging; Group C: SA without aging; Group D: CO without aging. For the control group, 20 CAD-CAM PMMA milled cylindrical specimens were sandblasted (SA) and aged. SBS was tested using a universal testing machine (0.25 mm/min), inspected at 2.5X magnification for failure mode classification and statistically analyzed (P = .05).
Results: The retention obtained with the 3D-printed material (groups A-D) was higher than that obtained with PMMA (Control group) however, no significant difference was found between the study and control groups except for group C (SA and no thermocycling) which was significantly higher than the control group (PMMA-SA and thermocycling) (P = .037). Study groups A-D predominantly exhibited cohesive specimen mode, meaning fracture of the specimen.
Conclusion: Orthodontic brackets bonded to 3D-printed material exhibited acceptable bonding strength. However, 3D-printed materials were more prone to cohesive failure, which may result in crown fracture.

Keywords: Prosthodontics, Retention, Bracket, Shear bond strength

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Korean J Orthod   

First Published Date October 17, 2022

Copyright © The Korean Association of Orthodontists.

Retentive strength of orthodontic brackets bonded to 3D-printed vs. milled materials after surface treatment and aging

Ameer Biadsee DMD MHA a, Ofir Rosner DMD b, Carol Khalil c, Vanina Atanasova DMD d, Joel Blushtein DMD e ,Shifra Levartovsky DMD f

a Post-graduate student, department of Oral Rehabilitation, Maurice and Gabriela Goldschleger School of Dental Medicine, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv 6997801, Israel
b Clinical instructor, department of Oral Rehabilitation, Maurice and Gabriela Goldschleger School of Dental Medicine, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv 699780, Israel.
c Under-graduate student, Maurice and Gabriela Goldschleger School of Dental Medicine, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv 6997801, Israel.
d Post-graduate student, department of Orthodontics, The Maurice and Gabriela Goldschleger School of Dental Medicine, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv 6997801, Israel.
e Clinical instructor, department of Orthodontics, The Maurice and Gabriela Goldschleger School of Dental Medicine, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv 6997801, Israel.
f Senior lecturer, department of Oral Rehabilitation, Maurice and Gabriela Goldschleger School of Dental Medicine, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv 699780, Israel.

Correspondence to:Ameer Biadsee,
Department of Oral Rehabilitation
The Maurice and Gabriela Goldschleger School of Dental Medicine
Tel Aviv University, Klatchkin 4
Tel Aviv 69978 Israel
Tel: +972-525833906
Email: Ameerb@mail.tau.ac.il

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Objective: The purpose of this study to evaluate the shear bond strength (SBS) of orthodontic brackets bonded to 3D-printed material after various surface treatments and aging in comparison to CAD-CAM polymethyl methacrylate (PMMA) milled material.
Methods: Eighty cylindrical specimens were 3D-printed and divided into 4 subgroups (n=20 each) according to the surface treatment and ageing procedure. Group A: sandblasted with 50 μm aluminum oxide particles (SA) and aging; Group B: sandblasted with 30 μm silica-coated alumina particles (CO) and aging; Group C: SA without aging; Group D: CO without aging. For the control group, 20 CAD-CAM PMMA milled cylindrical specimens were sandblasted (SA) and aged. SBS was tested using a universal testing machine (0.25 mm/min), inspected at 2.5X magnification for failure mode classification and statistically analyzed (P = .05).
Results: The retention obtained with the 3D-printed material (groups A-D) was higher than that obtained with PMMA (Control group) however, no significant difference was found between the study and control groups except for group C (SA and no thermocycling) which was significantly higher than the control group (PMMA-SA and thermocycling) (P = .037). Study groups A-D predominantly exhibited cohesive specimen mode, meaning fracture of the specimen.
Conclusion: Orthodontic brackets bonded to 3D-printed material exhibited acceptable bonding strength. However, 3D-printed materials were more prone to cohesive failure, which may result in crown fracture.

Keywords: Prosthodontics, Retention, Bracket, Shear bond strength