Percorrer por autor "Bugaighis, Iman"
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- 3D assessment of mandibular buccal shelf geometry for optimal micro-implant placement site in Portuguese individuals : a retrospective cone-beam computed tomography studyPublication . Borga, Joana; Bugaighis, Iman; Proença, Luís; Pereira, François Durand; Costa, Helder Nunes; Pereira, Pedro MarianoObjectives: To determine the most favourable Micro-Implant (MI) insertion site along the mandibular buccal shelf (MBS), using Cone Beam Computed Tomography (CBCT). Methods: This retrospective study assessed CBCT scans from 90 Portuguese patients (32 males and 58 females, aged 14 to 40 years). Paired MBS sites were determined. Comparative and correlation analyses were performed at p < 0.05. Results: A significant increase in MBS width was observed from the mesial to the distal direction (p < 0.001). Conversely, both the MBS steepness and cortical bone thickness significantly decreased from mesial to distal (p < 0.001). Significant negative correlation was also found between age and cortical bone thickness adjacent to the distobuccal cusp and distal tangent of both mandibular second molars (r ≤ −0.373, p ≤ 0.007). Furthermore, significant asymmetric differences were identified between the right and left MBS steepness as well as in the paired cortical bone thickness at the mesiobuccal cusp, buccal groove, and distobuccal cusp of the mandibular second molar (p ≤ 0.016). Conclusions: The results indicate that although there are sufficient MBS width and cortical bone thickness, vestibular to the mandibular second molar for MI insertion, the sites towards the distal root of the mandibular second molar are more favourable when considering MBS steepness. These findings are consistent for both sexes and apply to young and old individuals.
- 3D assessment of the relationship of the mandibular buccal shelf with the mandibular canal : a CBCT retrospective studyPublication . Feliciano, Jéssica; Pereira, Pedro Mariano; Proença, Luís; Borga, Joana; Bugaighis, ImanObjective: This study aimed to evaluate the micro-implant safest insertion site on the mandibular buccal shelf (MBS) without compromising the integrity of the mandibular canal (MC). Methods: This retrospective investigation included cone-beam computed tomography (CBCT) of 96 Portuguese patients (58 females and 38 males, average age of 25.5±10.2 years). Measurements were taken in four bilateral MBS sites buccal to the mandibular second molar; tangent to the distal surface (7D), distobuccal cusp tip (7CD), buccal groove (7S) and mesiobuccal cusp tip (7CM). The transversal MBS midpoint was also determined, and the maximum angulation from the transversal MBS midpoint was extracted relative to the true vertical plane. Subsequently, the distance from the MBS midpoint to the MC was calculated at this angulation. Descriptive and inferential statistical analyses were performed at p<0.05 Results: Significant correlations were observed among several variables and age, sex and bilateral asymmetry (p<0.05). The MBS transversal width and the distance from the MBS midpoint to the MC progressively increased in the posterior direction while the angulation decreased. Conclusion: The most appropriate micro-implant insertion location compared to the other MBS investigated sites, in the absence of impacted third molars, is adjacent to the distal surface of the second molar. This finding is consistent across all age groups, sexes, and insertion sides. However, due to the demonstrated variability, taking a CBCT scan prior to mini-implant insertion might be considered to minimize the risk of injury to the inferior alveolar nerve.
- 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.
- Assessment of the aesthetic proportions of the anterior maxillary teeth among dental Libyan students : an observational studyPublication . Ganeiber, Tayisir; Bugaighis, ImanBackground: Dental aesthetics and attractive, harmonious smiles contribute significantly to patients’ decisions regarding treatment preference. Aims: This article investigates the existence and suitability of golden proportion, golden percentage, and recurring aesthetic dental (RED) proportion in Libyan dental students with natural dentition. Methods: This prospective cross-sectional observational study comprised 73 Libyan dental students who met the inclusion criteria (34.2% males and 65.8% females with a mean age of 25 3.0 years). A photograph of the six anterior maxillary teeth was taken for each participant, and the apparent width of each was extracted digitally. Subsequently, the golden proportion, golden ratio, and the RED ratio were computed and compared with their corresponding standard notions. Descriptive and inferential analyses were performed at p < 0.05. Results: There were no significant sex differences for all variables. Therefore, the data was pooled together for further analysis. The Libyan golden proportion differed significantly from their corresponding standard values at p < 0.05. A similar significant discrepancy was observed in the golden percentage except for the maxillary left lateral incisors (p ¼ 0.206). Furthermore, the mean values of the RED proportion were not constant, and the mean ratio increased moving distally, which did not align with the standard RED proportions. Conclusion: The proposed golden proportions, golden percentage, and RED rations were not pertinent to our cohort of Libyan dental students. Anterior tooth proportions vary among populations according to their ethnicity and geographic background. Therefore, proportions should be utilized based on the same population and ethnicity.
- Bone availability in the sagittal dimension of the infrazygomatic crest for miniscrew insertion : a retrospective cone-beam computed tomography studyPublication . Furão, Susana; Bugaighis, Iman; Proença, Luís; Brito, José; Costa, Hélder Nunes; Pereira, François Durand; Pereira, Pedro MarianoBackground: There is limited information available regarding the bone volume in the sagittal dimension of the infrazygomatic crest (IZC) that is safe for the insertion of a temporary skeletal anchorage device. The objective of this study was to assess the sagittal bone availability when the anterior and posterior walls of the IZC reach an inclination of 45°. Methods: A cross-sectional investigation was undertaken on 100 cone-beam computed tomography scans of 40 males and 60 females. A total of 20 landmarks were digitized for each IZC outline, 1 mm from the vestibular alveolar bone, and their x, y, and z coordinates were extracted. Afterward, the sagittal measurement of the IZC at which the curvature reached 45° was recorded. Symmetry of measurements was assessed using paired-samples t tests. In addition, these measurements were compared as a function of sex and age group (≤21 vs >21 years) using an independent-samples t test and the Spearman rank correlation coefficient test (P <0.05). Results: There were no significant differences between paired sagittal measurements of the IZC (3.5 ± 1.5 mm on the right side and 3.6 ± 1.3 mm on the left side; P = 0.144), except for younger patients (P = 0.030). In addition, no significant differences were found between corresponding male and female measurements (P ≥0.149). A significant discrepancy was identified between the younger age group (3.2 ± 1.2 mm) and the older cohort (3.8 ± 1.6 mm) for the sagittal dimension of the right IZC (P = 0.038), with an estimated mean difference of 0.03-1.16 mm (95% confidence interval). A significant positive weak correlation was found between the sagittal dimension of the right IZC and age (ρ = 0.201; P = 0.045). Conclusions: Sufficient IZC bone volume is available at an angle of 45° for inserting a temporary skeletal anchorage device, with no sex or side variation, except for the significantly greater sagittal dimension of the right IZC in older patients.
- 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.
- A critical review of the prevalence of cleft lip and cleft palate in Arab countriesPublication . Bugaighis, ImanBackground: Orofacial cleft can occur as an isolated birth defect, a nonsyndromic abnormality, or as part of a syndrome with multiple congenital anomalies, and its prevalence can vary by ethnicity, sex and geographic location. Aim: To review literature on the prevalence of orofacial cleft in Arab countries. Methods: A search of relevant publications, in English, on the prevalence of orofacial cleft in Arab countries was performed on Web of Science, PubMed, Google Scholar and Scopus using several keywords, including the name of each Arab country. Results: Our findings show an average prevalence of orofacial cleft of 1.1 per 1000 livebirths, with a range of 0.3-2.6 per 1000 livebirths in the Arab countries. There were inconsistencies in reporting for the different countries and in the methodologies used. Various publications from the same countries reported different prevalence figures. Conclusions: The inconsistency in the findings from this study indicate an urgent need for Arab countries to establish comprehensive national birth defect surveillance systems or expand existing systems to provide reliable and up-to-date evidence for policy, practice and interventions.
- The effect of ceramic surface conditioning on bond strength of metallic brackets : an in vitro studyPublication . Ferreira, Rita; Pereira, Pedro Mariano; Pitschieller, Ricardo; Proença, Luís; Bugaighis, ImanObjective: To compare the shear bond strength (SBS) of brackets bonded to three different types of ceramic surfaces (feldspathic ceramic, lithium disilicate ceramic, and zirconia), conditioned with either hydrofluoric acid or sandblasting, using Assure® Plus All bonding agent. Materials and methods: A total of 72 monolithic CAD/CAM ceramic specimens were divided into six groups of 12 samples. Three groups (G1: feldspathic ceramic, G3: lithium disilicate ceramic, G5: zirconia surfaces) were conditioned with 9.6% hydrofluoric acid, while the remaining three (G2, G4, G6; with ceramic type in the same order as the previous three groups) were prepared with 50 μm aluminum oxide sandblasting. Premolar brackets were bonded using light-cured Assure® Plus All. The SBS and adhesive remnant index (ARI) were recorded and submitted to inferential analysis using one-way analysis of variance and Kruskal–Wallis tests, respectively. The significance level was set at 5% (P ≤ 0.05). Results: The mean SBS values for the three different ceramic groups conditioned with hydrofluoric acid (G1: 7.2 ± 1.5 MPa, G3: 9.3 ± 2.3 MPa, G5: 8.5 ± 2.0 MPa) were significantly higher than those obtained for the groups prepared by sandblasting before bonding (G2: 7.5 ± 1.8 MPa, G4: 4.4 ± 2.0 MPa, G6: 4.3 ± 2.8 MPa). Conclusions: The hydrofluoric acid treatment produced a favorable SBS for all three examined ceramic types before bracket bonding with Assure® Plus All. In comparison, sandblasting yielded a satisfactory SBS only with feldspathic surfaces. Furthermore, the ARI indicated a higher frequency of mixed-adhesive failures except for lithium disilicate conditioned with sandblasting. Therefore, using hydrofluoric acid is likely to be especially recommended when the clinician is not aware of the brand of ceramic restorative material.
- 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.