Bond Strength Of Brackets Research Articles

Effect of 5.25% Sodium Hypochlorite on Shear Bond Strength of Orthodontic Brackets Bonded with OBA-MCP

Effect of 5.25% Sodium Hypochlorite on Shear Bond Strength of Orthodontic Brackets Bonded with OBA-MCP

Shear bond strength and ARI scores of metal brackets to glazed glass ceramics and zirconia: an in vitro study investigating surface treatment protocols

ObjectiveTo evaluate the shear bond strength (SBS) and adhesive remnant index (ARI) scores of metal brackets to glazed lithium disilicate reinforced glass-ceramics and zirconia according to various surface treatment protocols.MethodsA total of 240 lithium disilicate ceramic (LD) and 240 zirconia (Zr) blocks were randomly divided according to sandblasting, hydrofluoric acid (HF) etching, universal primer use, and the adhesive system applied. A maxillary canine metal bracket was bonded to each sample with resin cement (Transbond XT, TXT). SBS tests and ARI score analysis were performed. Four-way ANOVA followed by Tukey’s post hoc test was used for SBS differences, and Fisher’s exact test was used for the ARI scores (p < 0.05).ResultsAll groups combining a universal primer with a universal adhesive with and without sandblasting provided satisfactory SBS values for both LD and Zr. Fractures of the samples were observed only for LD in the groups combining HF with universal primers and universal adhesives with and without sandblasting.ConclusionsCombining a universal primer with a universal adhesive could be recommended for orthodontic bonding to both LD and Zr. Regarding their risks (i.e., damaging the restoration surface or burning the oral tissues), sandblasting or HF might not be necessary despite the presence of glaze covering the ceramic surface.

Shear Bond Strength of Orthodontic Stainless Steel Bracket in Bovine Teeth Submitted to Bleaching Agents

The purpose of this in vitro study was to determine the influence of bleaching agents in the shear bond strength of orthodontic stainless steel bracket. The samples were composed by 90 bovine lower central incisors, which were divided into three groups named G1 (not submitted to bleaching), G2 (bleached with carbamide peroxide at 16%-Whiteness HP - FGM ®) and G3 (bleached with hydrogen peroxide at 35%-Whiteness HP, FGM ®). The teeth were stored in distilled water at a temperature of 37oC for 24 hours and 30 days was expected for the bonding of brackets Gemini 3M (3M - Unitek ®), after a wait period of 30 days the brackets were placed to all groups of samples, applied with the composite Transbond XT (3M/ESPE®). The shear bond test was performed in material testing machine EMIC DL 2000, carried under a deformation speed of 0.5 mm / min. The G1 presented an average strength of 6,05 (±3,47) MPa, while the G2 presented an average resistance of 2,52 (±1,69) MPa, and the G3 demonstrated 1,58 (±1,17) MPa. The results concluded that the dental bleaching induced, in the experimental model used, significant reduction of shear strength of brackets bonded to dental elements subjected to both in-home and in-clinic bleaching. These findings suggest that adherence of the resin used in the placement of the brackets was damaged by bleaching. Therefore, the most affected in the analysis of shear bond strength was first the in-clinic bleaching, followed by in-home bleaching and at last the control group and the greater the concentration of bleach is less shear strength. So it is suggested to perform the bleaching treatment after orthodontic treatment.

The Impact of Different Time of Enamel Etching on Shear Bond Strength of Metallic Brackets

The Impact of Different Time of Enamel Etching on Shear Bond Strength of Metallic Brackets

Evaluation of Shear Bond Strength of Metallic Brackets with Different Acid Concentrations

Evaluation of Shear Bond Strength of Metallic Brackets with Different Acid Concentrations

The Effect of Thermocycling on the Shear Bond Strength of Flash-free Brackets and Healing Dynamics of Enamel Microcracks: An In vitro Study.

This study evaluates long-term shear bond strength (SBS) and enamel micro cracks (MCs) healing after using adhesive pre-coated brackets (APC). A total of eighty extracted human premolar teeth were randomly divided into four experimental groups (n = 20 per group): Control group: Teeth underwent indentation but no bracket bonding; group II : Teeth were subjected to indentation without exposure to thermocycling; group III: Teeth experienced both indentation and thermocycling; group IV: No indentation was applied to the teeth; groups III and IV were further divided into two subgroups to simulate different clinical timelines: Subgroup A (n = 10): Teeth underwent 5,000 thermocycles, equivalent to six months of clinical use. Subgroup B (n = 10): Teeth were subjected to 10,000 thermocycles, representing 12 months of use. All precoated brackets underwent debonding with a universal testing machine to assess the SBS, and the adhesive remnant index (ARI) was scored to evaluate the amount of adhesive left on the tooth surface. The study also examined horizontal and vertical enamel cracks, both pre- and post-intervention, across all groups. Crack healing was quantitatively assessed using computer-assisted digital image analysis to ensure precision. For statistical evaluation, ANOVA, Kruskal-Wallis H-test, and Tukey's post-hoc tests were applied to assess differences among the groups. The Kruskal-Wallis H-test demonstrated no significant ARI difference between the groups (p = 0.790). A one-way ANOVA showed a significant difference among all groups (p < 0.001), with lower values observed in the group with indentation without thermocycling compared to all other groups and the groups with 5,000 thermocycles compared to the groups with, 10,000 thermocycles. Crack healing was observed in the control and second groups, and cracks were directly proportional to the number of thermocycles and SBS values. The study showed that APC FF's SBS increased, and thermal aging did not change the failure pattern. Thermocyclers and SBS affected enamel cracks. The bond strength of pre-coated brackets and microcrack healing gradually increased with time, while the pattern of bond failure did not change. How to cite this article: Shamsan H, Albelasy NF, Farahat DS, et al. The Effect of Thermocycling on the Shear Bond Strength of Flash-free Brackets and Healing Dynamics of Enamel Microcracks: An In vitro Study. J Contemp Dent Pract 2024;25(9):836-845.

In vitro assessment of chemical surface treatments on the shear bond strength of metal orthodontic brackets to CAD/CAM provisional materials

In vitro assessment of chemical surface treatments on the shear bond strength of metal orthodontic brackets to CAD/CAM provisional materials

Comparison of shear bond strength of metallic orthodontic brackets bonded to zirconia models underwent different surface conditioning methods and different primer systems

Objectives: This study aimed to compare the shear bond strength (SBS) of metal brackets bonded to zirconia models with different surface treatment methods and two types of primers and to determine the adhesive remnant index (ARI). With the increase in demand for orthodontic treatment by adults and most adult patients having acrylic resin, amalgams, gold, composite resin, zirconia, or porcelain restorations, bonding of orthodontic braces to these surfaces is now a necessity. Brackets bonding to zirconia prostheses are a challenge in orthodontics because they need special surface conditioning. Material and Methods: In this in vitro study, 60 zirconia models were divided randomly into two groups of 30 models according to the primer material used (Assure® Plus and Transbond™ XT). The labial surface of each model was subjected to one of the following three surface preparation: No surface treatment (control group), sandblasting with 50 µm aluminum oxide (Al2O3) particles, and acid etching with 9.6% hydrofluoric acid (HF). Metal orthodontic brackets (Dentaurum) were bonded to zirconia models using Assure® Plus or Transbond™ XT adhesives. The SBS was measured using a universal testing machine at a crosshead speed of o.5 mm/min. The labial surfaces of models were inspected under a stereomicroscope, and the ARI scores were determined. Raw data were analyzed using Statistical Package for the Social Sciences program through analysis of variance and the Kruskal–Wallis test (P ≤ 0.05). Results: The Al2O3 air abrasion with the Assure® Plus group had the highest mean of SBS values, while HF groups with Transbond™ XT adhesive or Assure® Plus gave rise a significantly lower SBS values than that obtained for the Al2O3 group. A significant difference was noted among the groups in the ARI scores. In Al2O3 group bonded with Transbond™ XT had scores 1 and 2, which was designated as a mix-type failure, indicating a favorable failure mode. Conclusion: This study showed that air abrasion of zirconia models had a significant effect on the SBS of metal brackets bonded to zirconia surface, and the Transbond™ XT adhesive is a suitable primer material.

SHEAR BOND STRENGTH OF DIFFERENT ORTHODONTIC BRACKET BONDING SYSTEMS ON SALIVA- CONTAMINATED ENAMEL: IN VITRO

The aim of this study was to compare the shear bond strength of orthodontic brackets with different adhesive systems without and with saliva contamination. One hundred and twenty bovine teeth were selected. The experimental design consisted of three bonding systems: 1. Transbond Color Change (TPCC) (3M, Sumaré, São Paulo, Brazil) orthodontic composite resin and Transbond Plus Self Etching Primer (SEP) (3M, Sumaré, São Paulo, Brazil), 2. BracePaste Adhesive (BP) (American Orthodontics) orthodontic composite resin, São Paulo, São Paulo, Brasil) and BracePaste MTP primer (BPMTP) (American Orthodontics, São Paulo, São Paulo, Brasil) and 3. Fuji Ortho LC (FO) (GC,Tokyo, Japão) cement resin-modified glass ionomer cement. For each material, the brackets were cemented to the bovine enamel in two conditions, dry or contaminated by saliva, and photoactivated for a total of 12 seconds by the Valo light-curing device (Ultradent, Indaiatuba, São Paulo). The specimens were stored for 24 hours and aged by thermocycling for 10.000 cycles. The specimens were submitted to the shear bond strength (SBS) test (n=10). The results were subjected to a three-factor analysis of variance and the ionomer material was analyzed separately using a two-way analysis of variance and Tukey's test (ɑ = 0.05). After RUC, all the materials showed a decrease in bond strength when contaminated by saliva, but the BP system showed greater bond strength in all conditions, followed by TCC. FO showed lower bond strength when thermocycled. Saliva contamination reduces bond strength in all bonding systems.

Effect of torque customization with composite resin bases on the shear bond strength and adhesive remnant patterns of lingual brackets : An in vitro evaluation.

This study evaluated the effect of torque customization of lingual brackets with resin-modified bases on their shear bond strength (SBS), adhesive remnant index (ARI), and bond failure patterns (BFP). The sample comprised 200 lingual lower incisor brackets (DTC® ORG, DTC Medical Apparatus, Hangzhou, China); 40brackets were tested as-received and 4groups with 40brackets each were customized for -10, -20, +10 and +20° torque respectively with light-cured composite resin (Transbond XT™, 3M Unitek, Monrovia, CA, USA) bases. All brackets were bonded to bovine mandibular incisors. Their SBS were estimated in auniversal testing machine (INSTRON®, Norwood, MA, USA) with agingivally directed force applied at the incisal bracket-adhesive interface with 1 mm/min crosshead speed. Their ARI and BFP were evaluated under 20× magnification. The SBS was 19.9 ± 7.6 MPa for noncustomized brackets, 20.1 ± 9.0 and 18.7 ± 8.2 MPa for brackets with 10 and 20° of negative torque, and 16.6 ± 5.68 and 19.45 ± 5.84 MPa for brackets with 10 and 20° of positive torque, respectively. The differences were not statistically significant (p = 0.097). Teeth with the -20° brackets exhibited higher median ARI scores than noncustomized brackets (1.5 vs 2, p = 0.018). Adhesive-cohesive bond failure with nearly axial split was more frequent in noncustomized brackets than customized ones, the reverse being true for adhesive-cohesive failure with nearly vertical split (p < 0.05). Truly cohesive bond failures were seen only in brackets with positive torque. Torque customization with aresin base is an acceptable strategy for metal orthodontic brackets as it does not affect their SBS. However, their BFP differed from noncustomized brackets, depending on the type of torque introduced.

Comparative evaluation of shear bond strength of metallic orthodontic brackets bonded to enamel prepared with Laser etching and conventional etching after bleaching: An in vitro study.

Comparative evaluation of shear bond strength of metallic orthodontic brackets bonded to enamel prepared with Laser etching and conventional etching after bleaching: An in vitro study.

Effect of conventional and digital methods and aging on the shear bond strength of orthodontic brackets with temporary crowns based on aged PMMA

Effect of conventional and digital methods and aging on the shear bond strength of orthodontic brackets with temporary crowns based on aged PMMA

Assessment of the Bond Strength of Orthodontic Bracket on Ceramic Crown Surface Using Three Various Bonding Agents: A Comparative Study.

The current study's aim was to evaluate the orthodontic bracket's bond strength employing three different bonding agents on a ceramic crown surface. Tooth preparation on 60 permanent maxillary premolar teeth extracted for orthodontic purposes was carried out. Supragingival finishing margins were made for all samples, and ceramic (PFM) crowns were fabricated. Following crown cementation on the prepared samples, they were divided into three experimental groups randomly (n = 20) as follows: group I: Bracket bonding using Transbond XT bonding agent; group II: Bracket bonding using RelyXTM Unicem bonding agent; and group III: Bracket bonding using Assure Plus bonding agent. A universal testing machine was utilized to conduct the shear bond strength test. Using a stereomicroscope with a 10× magnification, adhesive remnant index scores were also used to assess the adhesive that was remaining on the surfaces. Data was recorded and statistically analyzed. The highest bond strength was found in RelyXTM Unicem bonding agent (19.38 ± 0.84) followed by Transbond XT bonding agent (17.12 ± 1.04) and Assure Plus bonding agent (16.14 ± 1.02). A highly significant difference was found between Transbond XT vs RelyXTM Unicem groups and RelyXTM Unicem vs Assure Plus groups. There was no significant difference found between Transbond XT and Assure Plus (p > 0.001). Adhesive Remnant Index scores showed that score 1 was higher [7 (35%)] in the Transbond XT bonding agent group. Score 1 was 8 (40%) and score 2 was 6 (30%) in RelyXTM Unicem bonding agent groups and in Assure Plus bonding agent group, score 2 was higher [9 (45%)]. In conclusion, RelyXTM Unicem exhibited superior bond strength with ceramic crowns when compared to Assure Plus and Transbond XT bonding agents. One of the most important steps in orthodontic therapy is bonding brackets to the teeth. A high enough and long-lasting bond between brackets and artificial surfaces is necessary for orthodontic treatment to be successful, as is the requirement for a bonding agent with the highest possible binding strength. The necessity for a more dependable process to glue the artificial crown surface has arisen due to the rise in adult patients seeking fixed orthodontic treatment. How to cite this article: Brajendu, Haque I, Sam G, et al. Assessment of the Bond Strength of Orthodontic Bracket on Ceramic Crown Surface Using Three Various Bonding Agents: A Comparative Study. J Contemp Dent Pract 2024;25(8):762-765.

Effect of Mechanical Surface Treatment on Shear Bond Strength of Orthodontic Brackets to 3D Printed and Milled CAD/CAM Provisional Materials: An In Vitro Study.

The aim of the study is to assess the impact of mechanical surface treatments on the shear bond strength (SBS) of orthodontic brackets bonded to three-dimensional (3D) printed and milled CAD/CAM provisional materials. Sixty cylindrical samples were fabricated for each provisional material. Samples were treated with one of the following surface treatments: aluminum oxide airborne particle abrasion, diamond bur rotary instrument roughening, and phosphoric acid etching (control). Stainless steel brackets were bonded to the samples, and then SBS was tested using a universal testing machine. SEM and digital microscopy were utilized to examine the bonding interface and the failure modes. Two-way ANOVA, one-way ANOVA, Tukey's HSD, and independent sample t-tests were used for statistical analysis. Results revealed significant differences in SBS between 3D printed and milled samples and significant differences in SBS among most surface treatments, with rotary instrument roughening resulting in the highest values for 3D printed, while airborne particle abrasion leading for milled samples. Digital microscopy indicated that more adhesive remained on 3D-printed samples. SEM analysis revealed varying surface roughness across treatments. Based on the findings of this study, it can be concluded that different surface treatments improve the bonding of orthodontic brackets to provisional crowns.

Microcomputed tomography assessment of microleakage and void formation under ceramic adhesive precoated orthodontic brackets

This study aimed to evaluate microleakage, voids, and gaps in ceramic adhesive precoated (APC) brackets using microcomputed tomography and investigate their correlation with bond strength. A total of 52 human premolars were included in this study. The teeth were randomly divided into 4groups of 13 teeth each. The brackets used in this study were the Clarity Advanced APC Flash-free Ceramic Bracket (3M Unitek, Monrovia, Calif) and the Clarity Advanced Ceramic Bracket (3M Unitek, Monrovia, Calif). The materials used for each group were as follows: (1) 37% phosphoric acid, Transbond XT primer (3M Unitek, Monrovia, Calif), and APC Flash-free Ceramic Bracket; (2) Transbond Plus self-etching primer and APC Flash-free Ceramic Bracket; (3) 37% phosphoric acid, Transbond XT primer, Transbond XT light-cure adhesive, and Clarity Advanced Ceramic Bracket; and (4) Transbond Plus self-etching primer, Transbond XT light-cure adhesive, and Clarity Advanced Ceramic Bracket. The teeth were scanned using microcomputed tomography for microleakage, void, and gap analyses. The bond strength was measured and recorded in megapascals. One-way analysis of variance was used to compare parameters with a normal distribution. The Kruskal-Wallis test was used to compare parameters that did not comply with the normal distribution. The relationships among variables were evaluated using Spearman and Pearson correlation coefficients. There were no statistically significant differences among the groups in terms of gap volume, void volume, and total void and gap volume values (P>0.05). No significant differences were observed in relation to bond strength (P>0.05). The mean bond strength was 20.42, 19.87, 19.28, and 19.47 for groups 1-4, respectively. The Spearman's correlation analysis results demonstrated that the bond strength was significantly affected by the gap volume and total void and gap volumes. The bond strength increased with reduced total volume of voids and gaps. There was no difference between the APC Flash-free Ceramic Bracket and the Clarity Advance Ceramic Bracket regarding bond strength, void volume, gap volume, and total void and gap volume. The gap volume and total void and gap volumes significantly affected the bond strength. The bond strength increased with decreased total void and gap volumes. The bond strengths of the APC Flash-free Ceramic Brackets were comparable to those of the ceramic brackets bonded using the conventional method.

The influence of recommended mouthwashes against coronavirus disease 2019 on the shear bond strength of orthodontic brackets

The influence of recommended mouthwashes against coronavirus disease 2019 on the shear bond strength of orthodontic brackets

Assessing the Different Nanoparticle-Reinforced Bonding Agents on the Shear Bond Strength of Orthodontic Brackets

ABSTRACT Background: The strength of the binding between brackets and tooth surfaces has a major impact on how well orthodontic therapy works. The shear bond strength of orthodontic brackets may be strengthened by the invention of bonding agents supplemented with nanoparticles, thanks to recent developments in nanoparticle technology. Materials and Methods: In order to perform a randomized controlled experiment, 90 human premolars were excised for orthodontic purposes. Three groups of 30 teeth were randomly assigned to each group: Group A used a bonding agent augmented with nanoparticles of titanium dioxide (TiO2), Group B used nanoparticles of zirconium dioxide (ZrO2), and Group C used a standard bonding agent as a reference. The appropriate bonding chemicals were used to attach the brackets to the teeth, and a universal testing equipment was used to measure the shear bond strength. Stereomicroscopic analysis was used to evaluate the failure mechanisms. To do statistical analysis, Tukey’s post hoc test and analysis of variance were used. Results: There were significant differences (P &lt; 0.05) in the mean shear bond strength values across the groups. The average shear bond strength for Group A (TiO2) was 18.5 ± 2.3 MPa, that for Group B (ZrO2) was 17.2 ± 2.6 MPa, and that for Group C (control) was 14.8 ± 2.4 MPa. In comparison to Groups B and C, Group A exhibited a statistically greater bond strength, although Group B also showed an improvement over the control. According to the failure mode analysis, the control group had mostly adhesive failures, whereas the nanoparticle groups saw mixed failures. Conclusion: When TiO2 and ZrO2 nanoparticles are added to bonding agents, the shear bond strength of orthodontic brackets is greatly increased in comparison to traditional bonding agents. TiO2-reinforced materials performed better, pointing to possible benefits for orthodontic applications. It is advised that further study be done to examine the long-term impacts and therapeutic implications of these results.

An in vitro study of orthodontic brackets bonded to transition dental zirconia: Shear bond strength, adhesive remnant index, and surface irregularities

Orthodontic treatment often involves bonding brackets to teeth, and the protocols for natural enamel differ from those for prosthodontically restored teeth. With the rising number of adult orthodontic patients, many present with zirconia crowns. This study aimed to evaluate the shear bond strength (SBS) of ceramic orthodontic brackets bonded to transition dental zirconia, which combines 3Y-TZP and 5Y-TZP powders. Ninety zirconia substrates were divided into three groups (n=30) based on transition zirconia brands (3M ESPE Lava™ Plus, Cercon® ht ML, and Katana™ Zirconia UTML) and bonded with ceramic brackets (CHIC Ceramic Roth Maxillary and Symetri Clear) using 3M™ Transbond™ XT. A control group used traditional zirconia and metal brackets. Surface treatments included 50-micron aluminium oxide abrasion and Z-Prime™ Plus application. SBS was tested post-thermocycling. Adhesive Resin Index (ARI) was scored and surface roughness was evaluated pre- and post-bonding. Group 1 (3M ESPE Lava™ Plus with CHIC Ceramic Roth Maxillary brackets) had a significantly lower SBS (mean 13.27MPa) compared to the other groups, which all had SBS values above 18.80MPa (P≤.023). Group 2 (3M ESPE Lava™ Plus with Symetri™ Clear) demonstrated a significantly higher mean ARI compared to the control group (Cercon® XT with Victory Series™ Roth), (P=.027). Additionally, significant changes in surface roughness were observed in Groups B (Cercon® ht ML) (P=.008) and C (Katana™ Zirconia UTML) (P=.016). This study determined that the shear bond strength of various transitional zirconia substrates with ceramic brackets exceeded the clinically acceptable SBS levels. The combination of 3M ESPE Lava™ Plus and Symetri™ Clear exhibited significant variation in ARI. Additionally, significant surface irregularities were observed in 3M ESPE Lava™ Plus and Cercon® ht ML following air abrasion, compared to other transitional zirconia brands.

Effect of Different Surface Pretreatment Methods on Shear Bond Strength of Orthodontic Brackets Bonded with a Self-Adhesive Composite

Aim: Patients undergoing fixed orthodontic treatments face a higher risk of white spot lesions (WSLs) due to difficulties in effective plaque control. Several preventive measures provide remineralization and antibacterial benefits that reduce WSLs. These measures, while protective, may adversely affect the shear bond strength (SBS) of orthodontic brackets, potentially leading to bracket debonding and impacting overall treatment effectiveness. This study comparatively evaluated the effects of pretreatments with fluoride varnish, chlorhexidine fluoride mouthwash (CHXF), and fluoridated casein phosphopeptide-amorphous calcium phosphate (CPP-ACPF) on the shear bond strength (SBS) of orthodontic brackets bonded with GC Ortho Connect composite resin. Methods: Sixty extracted premolar teeth were randomly divided into four groups. The first group was the control without pretreatment, and the second to fourth groups were pretreated with 5% fluoride varnish for 4 minutes, with a CHXF for 7 days, and with CPP-ACPF for 3 minutes, respectively. Specimens were subsequently tested for the SBS in a universal testing machine. Each tooth was visually examined and magnified (×10) using a Nikon SMZ800 to evaluate the adhesive remnant index (ARI).One-way ANOVA, followed by post hoc Tukey tests used for statistical analysis. The significance level was set at P&lt;0.05. Results: Evaluation of SBS showed no significant differences between the control, chlorhexidine fluoride mouthwash, and CPP-ACPF groups (P&gt;0.05). However, the SBS of the fluoride varnish group was significantly lower than in other groups (P&lt;0.05). Adhesive remnant index (ARI) scores did not show significant differences between the four groups (P=0.057). Conclusion: The results showed that the SBS of the brackets in the CPP-ACPF paste, CHXF, and fluoride varnish groups were higher than the appropriate range for orthodontic purposes.

Shear Bond Strength of Ceramic Brackets on Enamel Conditioned With CO2 Laser.

Objective This study evaluated the shear bond strength of ceramic brackets on enamel conditioned using three methods: CO2 laser, 37% phosphoric acid, and a combination of both, and analyzed the adhesive remnant index (ARI) to determine the amount of residual adhesive after bracket removal. Material and methods A total of 120 human premolars were stored in 0.2% thymol (Wt/vol) and divided into four groups (n=30/group): Group I was enamel conditioned with 37% phosphoric acid; Group II was irradiated with a CO2 laser at 0.5W power; Groups III and IV, 37% phosphoric acid; and CO2 laser wascombined at powers of 0.5W and 3W, respectively. Brackets were bonded using Transbond Plus CC resin. Samples were light-cured for 15 seconds and stored (37°C, 24 h). ARI assessment: The amount of adhesive remaining on the enamel surface was determined using a scale of 0 to 3. The analysis of shear bond strength and ARI was performed using the Kruskal-Wallis Test. Results Statistical analysis revealed significant differences between some groups. Group III, which combined acid etching and CO2 laser conditioning, showed lower bond strength than the control group, although not significantly. On the other hand, Group II (CO2laser only) showed the lowest bond strength and significant differences compared to the different groups, indicating that the exclusive use of laser is ineffective for conditioning. Significant differences were also observed between Groups III and IV, with Group IV exhibiting higher bond strength. However, the average value (GIII: 10.59±5.66 and GIV: 18.01±8.95 MPa) exceeded the recommended range (5.9 - 7.8 MPa). Regarding the ARI, Group II showed the lowest value, with significant differences compared to the other groups. Although Group IV had a higher ARI value than Group III, this difference was not statistically significant. Conclusions The combined use of phosphoric acid and CO2 laser provides adequate bond strength for ceramic brackets, with a lower amount of residual adhesive, which facilitates their removal and reduces the risk of damage to the enamel. Although laser irradiation alone does not provide sufficient bond strength, its use in combination with 37% phosphoric acid optimizes retention and minimizes the negative effects associated with conventional acid etching.