Shear bond strength evaluation of metallic brackets bonded to a cad/cam pmma material compared to traditional prosthetic temporary materials: An in vitro study

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dc.coverageDOI: 10.1590/2177-6709.25.3.031-038.oar
dc.creatorGarcés, Gonzalo Andrés
dc.creatorRojas, Victor Hugo
dc.creatorBravo, Cristian
dc.creatorSampaio, Camila S.
dc.date2020
dc.date.accessioned2025-11-18T19:53:34Z
dc.date.available2025-11-18T19:53:34Z
dc.description<p>Introduction: Orthodontic treatment for adults is currently increasing, and therefore the need to bond brackets to restorations and temporary crowns. The use of CAD/CAM PMMA provisional restorations for orthodontic purposes have not yet been described, and there is currently insufficient information regarding the strength of bracket adhesion. Objective: This study aimed at evaluating the effects of thermocycling (TC) and surface treatment on shear bond strength (SBS) of brackets to different provisional materials. Methods: Forty specimens were made from each material [PMMA (Telio Lab), bis-acryl (Telio CS C&amp;B), and PMMA CAD/CAM (Te-lio CAD)], sandpapered, and divided according to surface treatment (pumiced or sandblasted) and TC (half of the samples = 1,000 cycles, 5°C/55°C water baths) (n = 10/group). Stainless-steel brackets were bonded to the specimens (using Transbond XT), and SBS testing was performed. Data were analyzed by three-way ANOVA and LSD post-hoc tests (α= 0.05). Failure types were classified with adhesive remnant index (ARI) scores. Results: SBS values ranged from 1.5 to 14.9 MPa. Sandblasted bis-acryl and sandblasted auto-curing PMMA groups presented similar values (p &gt; 0.05), higher than the CAD/CAM material (p &lt; 0.05), with or without TC. When thermocycled, pumiced bis-acryl showed higher SBS than pumiced acrylic (p = 0.005) and CAD/CAM materials (p = 0.000), with statistical difference (p = 0.009). TC showed negative effect (p &lt; 0.05) for sandblasted bis-acryl and pumiced acrylic groups. ARI predominant score was mostly zero (0) for CAD/CAM, 1 and 2 for bis-acryl, and 1 for acrylic groups. Conclusion: In general, bis-acryl material showed the highest SBS values, followed by acrylic and CAD/CAM materials, which showed SBS values lower than an optimum strength for bonding brackets.</p>eng
dc.descriptionIntroduction: Orthodontic treatment for adults is currently increasing, and therefore the need to bond brackets to restorations and temporary crowns. The use of CAD/CAM PMMA provisional restorations for orthodontic purposes have not yet been described, and there is currently insufficient information regarding the strength of bracket adhesion. Objective: This study aimed at evaluating the effects of thermocycling (TC) and surface treatment on shear bond strength (SBS) of brackets to different provisional materials. Methods: Forty specimens were made from each material [PMMA (Telio Lab), bis-acryl (Telio CS C&amp;B), and PMMA CAD/CAM (Te-lio CAD)], sandpapered, and divided according to surface treatment (pumiced or sandblasted) and TC (half of the samples = 1,000 cycles, 5°C/55°C water baths) (n = 10/group). Stainless-steel brackets were bonded to the specimens (using Transbond XT), and SBS testing was performed. Data were analyzed by three-way ANOVA and LSD post-hoc tests (α= 0.05). Failure types were classified with adhesive remnant index (ARI) scores. Results: SBS values ranged from 1.5 to 14.9 MPa. Sandblasted bis-acryl and sandblasted auto-curing PMMA groups presented similar values (p &gt; 0.05), higher than the CAD/CAM material (p &lt; 0.05), with or without TC. When thermocycled, pumiced bis-acryl showed higher SBS than pumiced acrylic (p = 0.005) and CAD/CAM materials (p = 0.000), with statistical difference (p = 0.009). TC showed negative effect (p &lt; 0.05) for sandblasted bis-acryl and pumiced acrylic groups. ARI predominant score was mostly zero (0) for CAD/CAM, 1 and 2 for bis-acryl, and 1 for acrylic groups. Conclusion: In general, bis-acryl material showed the highest SBS values, followed by acrylic and CAD/CAM materials, which showed SBS values lower than an optimum strength for bonding brackets.spa
dc.identifierhttps://investigadores.uandes.cl/en/publications/05ee270c-7151-4137-8f25-48a15cd66319
dc.identifier.urihttps://repositorio.uandes.cl/handle/uandes/58312
dc.languageeng
dc.rightsinfo:eu-repo/semantics/openAccess
dc.sourcevol.25 (2020) date: 2020-05-01 nr.3 p.31-38
dc.subjectAcrylic resins
dc.subjectAir abrasion
dc.subjectBonding agents
dc.subjectCAD/CAM
dc.subjectOrthodontics
dc.subjectAcrylic resins
dc.subjectAir abrasion
dc.subjectBonding agents
dc.subjectCAD/CAM
dc.subjectOrthodontics
dc.titleShear bond strength evaluation of metallic brackets bonded to a cad/cam pmma material compared to traditional prosthetic temporary materials: An in vitro studyeng
dc.typeArticleeng
dc.typeArtículospa
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