د. زهراء محمد عباس الفاضلي

Background: One important factor in orthodon cs to consider is the bracket's bonding strength to the teeth substrate. This study's objec ve is to see how the rubbing and wai ng approach of a universal adhesive system affects the shear bond strength and adhesive remnant index (ARI) of orthodon c brackets. Materials and Methods: This was an experimental study (in vitro). Fi y newly extracted human maxillary f irst premolars were divided into five groups of 10 teeth each. The universal adhesive was applied on the Keywords: Orthodon cs; Shear bond strength; Universal Adhesive. Cita on: Al-Fadhily ZM, et al. (2025) Impact of Rubbing and Wai ng Technique of a Universal Adhesive System on Shear Bond Strength of Orthodon c Brackets: A Compara ve Analysis. Den stry 3000.1:a001 doi:10/5195/d3000.2025.812 buccal surface with 20 seconds of rubbing followed by 0, 5, 10, 15, or 20 seconds of wai ng protocol according to their group. The teeth were set into blocks of acrylic resin, and the shear bond strength was tested. A erwards, ARI was assessed. Sta s cal analyses were performed using the one-way analysis of variance and Tukey HSD post hoc. In addi on to the Kruskal-Wallis test. Results: One-way ANOVA showed significant differences (p=0.000) between the groups. The maximum shear bond strength was for group 5 (18.93 ± 2.82), with significant differences from group 1 (p= 0.000) and group 2 (p= 0.006). The minimum bond strength was for group 1 (11.09 ± 1.50), with significant differences from all the other groups. ARI scores revealed no significant differences between the groups (p= 0.406). Conclusion: By allowing for adequate solvent evapora on and monomer infiltra on—both of which are essen al for the clinical outcome of orthodon c treatment—extending the wai ng period improves the shear bond strength. The ARI was not significantly impacted by wai ng me.

Background: The release of metallic ions, such as nickel and chromium, from fixed orthodontic appliances may lead to adverse effects, including hypersensitivity in patients. The use of whitening mouthwashes to address discoloration associated with orthodontic treatment can potentially increase the corrosion of metallic components, thereby enhancing ion release. Aim: This study aims to evaluate the release of nickel and chromium ions from two types of orthodontic archwires when exposed to commonly used whitening mouthwashes. Materials and Methods: A total of 200 stainless steel archwires, 200 nickel-titanium archwires, 400 half-set orthodontic brackets, and 800 molar tubes were utilized. The experimental setup included exposure to four whitening mouthwashes: Lacalut, Colgate Optic White, Capitano Activated Vegetable Charcoal, and Signal Expert Protection. Nickel and chromium ion release was measured over varying time periods. Results: The metallic components of fixed orthodontic appliances demonstrated a progressive increase in nickel and chromium ion release across all whitening mouthwash types over time. Significant differences were observed in ion release rates among the mouthwashes, except on the first day, where most brands exhibited non-significant differences. Notably, nickel-titanium archwires released significantly higher ion levels compared to stainless steel archwires. Conclusion: Whitening mouthwashes contribute to increased nickel and chromium ion release from fixed orthodontic devices over time. Nickel-titanium archwires are more susceptible to ion release than stainless steel, underscoring the need for careful consideration of mouthwash type during orthodontic treatment.

ABSTRACT Objectives: A study conducted to investigate the location of the mental foramen using computed tomography to evaluate whether there is a correlation between this radiographic parameter with age and gender of the Al-Najaf population and evaluate it relates to forensic odontology. Materials and methods: 72 computed tomographic images were studied to measure the distance from the lower border of the mental foramen to the lower border of the mandible. The study sample was divided into two groups, group I age (14-35) and group II age (36-60) years (each group consisted of 36 subjects), and also grouped according to sex (each group consisted of 36 subjects). Statistical analysis: Statistical analysis was done by using SPSS (statistical package for social sciences) version 20. In which we use mean and standard deviation as descriptive statistics. For analysis of data, we use independent sample t-test and Pearson correlation coefficient. p-value ≤ 0.05 regarded as significant. Results: There is a significant difference in the location of the mental foramen to the lower border of the mandible which was higher in males than females while there is no significant difference regarding the age of the subject. Conclusion: There could be sexual dimorphism regarding the location of the mental foramen to the lower border of the mandible. This difference does not seem to be found regarding the age of the subject in Al-Najaf population. Key words: Mental foramen, Inferior border of the mandible, Forensic dentistry, Computed tomography, Age and sex

Abstract Background Bonding of orthodontic brackets of fixed orthodontic appliance by using acid etch technique was first introduced in 1955. LED-based light sources posses many benefits as minimal heat generation. There is a new generation of LED light cure corporate with three different intensities (standard, high power and extra power). Objective This study was aimed to evaluate the effect of increasing intensity and decreasing duration of LED light on shear bond strength and adhesive remnant index of metal orthodontic brackets. Materials and Method Sixty healthy extracted maxillary premolars were divided into three groups of twenty teeth for each, group (I) cure with a standard LED light curing (1000mW/cm2) for 10 seconds, group (II) cured through a high-intensity LED curing light (1400mW/cm2) for 8 seconds, group (III) cured with a extra high-intensity LED curing light (3200mW/cm2) for 6 seconds. The teeth mounted in acrylic resin, Shear bond strength test was done. Then, adhesive remnant index (ARI) was evaluated. Data were analyzed by one-way analysis of variance ANOVA test and LSD, and Fisher exact test. Results The results showed that there were statistically significant differences among the study groups. The maximum value of shear bond strength was for group III (17.834 ± 0.367) and the minimum shear bond strength value was for group I (8.888 ± 0.307). ARI scores showed a statistically significant differences among groups, with a high tendency toward score 1 and score 0 in all three groups. Conclusion High intensity LED light with low curing duration has advantage of increasing bond strength in addition to reducing chair time taken for curing procedure and enamel cleaning following de-bonding procedure without any effect on the enamel integrity.

Objective: This study was aimed to estimate the antimicrobial effect of miswak drenched used as mouthwash for orthodontic patients and compare this effect with Listerine mouthwash. Materials and method: Thirty two patients wearing fixed orthodontic appliance and have good oral health were haphazardly separated into: group Ι used miswak drenched and group ΙΙ used Listerine mouthwash. The first samples were taken 3 weeks after bonding of fixed appliance (pre-using the mouthrinces). The second samples were taken 4 weeks (post-using the mouthrinces). The colonies forming units were compared between the groups and within the same group (pre and post-using mouthrinces). Results: The result showed highly significant difference between group Ι pre and post-using miswak drenched with p value=0.000. Also, there was highly significant difference between group ΙΙ pre and post-using of Listerine mouthwash with p value=0.000. The comparison between group Ι and group ΙΙ pre and post-using of mouthrinces showed no significant difference. Conclusion: The miswak drenched greatly effective in reducing microbial growth when used for orthodontic patients under treatment with fixed appliance and this effect appear to be similar to antimicrobial effect of Listerine mouthwash. Keywords: Miswak drenched, Listerine, Antimicrobial, Orthodontic.

Background: fixed orthodontic appliances consider as a host for dental plaque accumulations which lead to subsequent gingivitis. Patients and method: O’Leary plaque index and gingival index by Löe and Silness of 60 repeated observations (before and after first stage of orthodontic treatment) which taken from 30 patients (13 male & 17 female) with age range (17-30) years old. Results: According to ANOVA, there was highly significant difference in plaque index before and after treatment in both males (p value=0.00) and females (p value=0.00), but there was no gender difference in plaque index before and after treatment. The present study showed that there was highly significance difference in the gingival index before and after treatment in both males (p value=0.00) and females (p value=0.00). Conclusion: plaque accumulation and gingival inflammation obviously increased in orthodontic patients, so good oral hygiene program must be followed during orthodontic treatment in order to overcome these side effects. Keywords: dental plaque, gingivitis, gender, fixed orthodontic appliances.

اقيمت دورة مخططة لمدة خمس ايام بتاريخ14\4 ولغاية 18\4\2024

15-11\3\2019

16-17\12\2016 حضور العديد من المحاضرات وورش العمل