Percorrer por autor "Bugaighis, Iman"
A mostrar 1 - 5 de 5
Resultados por página
Opções de ordenação
- Assessment of level of knowledge understood and memorized of panoramic anatomical landmarks among dental students in Benghazi, LibyaPublication . Elsheikhi, Fatma; Betamar, Naeima; Bugaighis, ImanBackground: Evaluation of skill competency and quality requirements of dental students plays an essential role in dental education. Aim: To investigate the level of knowledge of cranio-dentofacial anatomic structures observed on panoramic radiographs by 4th-year dental students and graduates in internship year at the Faculty of Dentistry, University of Benghazi. Materials and Methods: A total of 73 4th-year dental students and 92 interns attending the 2018/2019 academic year participated in this study to identify 24 landmarks on a traced panoramic radiograph. Descriptive statistics and Chi-square analyses were performed (P < 5%). Results: The overall correct answer rate for 24 anatomical landmarks was 26.2% (±0.23) among the 4th-year students and 29.68% (±0.24) among interns. Significant differences were observed only between hard tissues and soft tissues/air layer. For both groups, Head of the condyle was the most identified (79.5% for the 4th-year and 71.7% for interns), while the middle nasal concha was the least recognized structure (100% incorrect answer). Conclusions: Both 4th-year students and interns had a similar level of knowledge in identifying anatomical structures shown on panoramic radiography. The teaching program should focus on familiarizing dental students with the unidentified anatomical structures on panoramic radiographs.
- Comparison of shear bond strength of metallic brackets bonded to ceramic surfaces utilizing different adhesive systems : an in vitro studyPublication . Pulido, María Belén Paz; Pereira, Pedro Mariano; Pitschielller, Ricardo; Proença, Luís; Bugaighis, ImanOBJECTIVE: To compare the shear bond strength (SBS) of orthodontic brackets bonded to three different types of ceramic surfaces (feldspathic, lithium disilicate, and zirconium) using Assure® Plus All and Transbond™ XT adhesives. MATERIALS AND METHODS: The sample comprised 72 monolithic computer-aided design and computer-aided manufacturing (CAD/CAM) ceramic samples that were randomly divided into six groups of 12 specimens each. Three groups (G1, feldspathic ceramic; G3, lithium disilicate ceramic; G5, zirconium surfaces) were bonded to metal brackets using Assure® Plus All adhesive, whereas the remaining three groups (G2, G4, G6; with the ceramic type in the same order as that in the previous groups) were bonded to metal brackets using Transbond™ XT. The samples were then subjected to 10,000 thermocycles. The SBS was calculated using the shear tests. The site of bonding failure was classified using the adhesive remnant index (ARI) score. One-way analysis of variance (ANOVA) and Kruskal–Wallis tests were used for statistical analyses at a 5% significance level. RESULTS: Statistically significant differences were observed in the mean SBS values of the groups (P < 0.001). The mean SBS for G6 (zirconium plus Transbond™ XT) (2.52 MPa) was significantly lower than that for all other groups. Furthermore, statistically significant differences were found in the ARI score distribution among the groups (P < 0.001). Differences were identified between G6 and G3 (lithium disilicate Plus All Assure® Plus All) and G5 (zirconium plus Assure® Plus All). CONCLUSIONS: The mean bonding strength of brackets with Assure® Plus All was higher than that with Transbond™ XT for all three types of ceramics. However, all groups, except the zirconium plus Transbond™ XT group, showed acceptable bonding strength for orthodontic purposes. The application of hydrofluoric acid followed by silane and finally the Assure® Plus All adhesive system is adequate for bonding brackets to any of the ceramic tested surfaces.
- Criteria for early diagnosis of third molar agenesis : a retrospective radiographic studyPublication . Dumas, Margaux; Pereira, Pedro Mariano; Bugaighis, Iman; Retto, Paulo Fernandes; Proença, LuísObjective: To explore the association between chronological, dental and skeletal ages and early diagnosis of third molars agenesis. Material and methods: This retrospective radiographic study comprised a sample of 282 Portuguese patients (122 males and 160 females) who sought orthodontic treatment between 2007 and 2018. Each participant had panoramic and lateral cephalometric radiographs performed before and after the age of 14 years. The chronological age was categorized into three intervals between 11.0 and 13.11 years of age. The full eruption of the four-second molars was used as a criterion in determining dental age. Skeletal age was verified by the vertebral maturation method. The diagnosis of agenesis of third molars was initially performed by observation of the initial panoramic radiography undertaken before the age of 14 years. Subsequently, the diagnosis of agenesis of third molars was confirmed by visualizing the second panoramic radiography, obtained after the age of 14 years. The association between the accuracy of the diagnosis and the chronological, dental and skeletal ages was evaluated using the chi-square test, at a 5% significance level. Results: No significant association between chronological age and alterations in the diagnosis of third molar agenesis was identified. However, there was a significant association between third molar agenesis and both dental age (p<0.001) and skeletal age (p=0.006). Conclusion: The eruption of the four-second molars and the peak of growth could be considered as criteria for early diagnosis of third molar agenesis, whereas chronological age is not a reliable diagnostic indicator.
- The effect of different reconditioning methods on bond strength of rebonded brackets : an in-vitro studyPublication . Pereira, Pedro Mariano; Bugaighis, Iman; Matos, Pedro M.; Proença, LuísAIM: To evaluate the effect of three different reconditioning techniques on the shear bond strength (SBS) of rebonded brackets. MATERIALS AND METHODS: Forty-five orthodontic brackets were bonded to human premolar teeth using Transbond™ XT. After debonding, the samples were randomly assigned into equal groups to assess three techniques for the removal of residual adhesive from bracket bases: in Group A, each bracket base was sandblasted with aluminum oxide; in Group B1, each base was cleaned superficially with a greenstone bur; and in Group B2, the bases were thoroughly abraded with a greenstone bur. Subsequently, brackets were rebonded and the SBS and the adhesive remnant index (ARI) were determined. Data were analyzed using one-way analysis of variance (ANOVA), plus Tukey and Kruskal–Wallis post-hoc tests (P ≤ 0.05). RESULTS: The average SBSs were: Group A, 11.75 (±4.83) MPa; Group B1, 8.22 (±4.01) MPa; and Group B2, 7.54 (±2.85) MPa. No statistically significant differences in SBS were found between Groups A and B1(P = 0.051) and Groups B1 and B2(P = 0.885), but there was a significant difference between Groups A and B2(P = 0.016). Regarding ARI scores, there were statistically significant differences between Groups A and B2(P < 0.001) and between B1 and B2(P = 0.014), but not between Groups A and B1(P = 0.068). CONCLUSION: All reconditioning methods were found to have a positive effect, but the sandblasting technique performed best. Brackets reconditioned by sandblasting and superficial grinding mainly showed mixed-type failure, while in samples thoroughly reconditioned by greenstone bur, bonding failure occurred predominantly at the adhesive/bracket interface.
- Perception of need for further refinement in a clear aligner treatment among orthodontists, dentists and laypeople : a retrospective studyPublication . Oliveira, Patrícia; Bugaighis, Iman; Costa, Hélder Nunes; Pereira, Pedro MarianoClear aligner treatment often requires further refinement to improve the orthodontic treatment outcome. However, the perceptions of treatment outcomes evaluated by orthodontists and dentists are sparse, and laypeople’s perceptions have yet to be explored. Here, we explore the perceptions of orthodontists, dentists, and laypeople concerning the treatment outcomes achieved after completing the first sequence of aligners. This cross-sectional study involved 37 orthodontists, 67 dentists, and 93 laypeople. We administered an online questionnaire containing intra-oral photographs of nine completed cases with pre- and post-first sequences of aligners. As a control, we used a digital prediction system for the treatment outcome. Self-perception was reported using a visual analog scale. Both orthodontists and dentists had similar perceptions about treatment outcomes (p = 0.363) but significantly differed from laypeople (p ≤ 0.0001). Both orthodontists and dentists recommended further treatment; orthodontists were more critical than dentists (p ≤ 0.001). Orthodontists were more critical than dentists in their evaluations of the need for further treatments; however, their perceptions of treatment outcomes were similar. Laypeople were more satisfied with the treatment outcomes, were less concerned with occlusion, and were more focused on the aesthetic results of the treatment.