Yazar "Hamamci, Nihal" seçeneğine göre listele

Listeleniyor 1 - 12 / 12
  • [ X ]
    Öğe
    Bilateral twinned teeth and multiple supernumerary teeth
    (Quintessence Publishing Co Inc, 2008) Tumen, Emin Caner; Hamamci, Nihal; Kaya, Filiz Acun; Tumen, Demet Suer; Celenk, Sema
    Dental twinning can result from the fusion of the developing dental germinal elements or the gemination of a single germ. In bilateral anterior and posterior dental twinning, problems such as poor esthetics, dental caries, arch-length problems, and periodontal disease often occur as a result of the irregular morphology. Several treatment methods have been described in the literature with respect to the different types and morphologic variations of twinned teeth, including endodontic, restorative, surgical, periodontal, and orthodontic treatment. This report documents the case of a young patient with an exceedingly rare phenomenon of permanent twinned teeth and multiple supernumerary teeth in both sides of the mandibular and maxillary arches, as a result of combined fusion and gemination.
  • [ X ]
    Öğe
    Cervical vertebral and dental maturity in Turkish subjects
    (Mosby-Elsevier, 2007) Basaran, Guevenc; Oezer, Toeruen; Hamamci, Nihal
    Introduction: The aim of this study was to investigate the relationships between the stages of calcification of teeth and the cervical vertebral maturity stages in Turkish subjects. Methods: A retrospective cross-sectional study was designed. The final study population consisted of 590 Turkish subjects. Statistical analysis of the data was performed with computer software. Spearman rank order correlation coefficients were used to assess the relationship between cervical vertebral and dental maturation. For a better understanding of the relationship between cervical vertebral maturation indexes and dental age, percentage distributions of the studied teeth were also calculated. Results: Strict correlations were found between dental and cervical vertebral maturation of Turkish subjects. For males, the sequence from lowest to the highest was third molar, central incisor, canine, first premolar, second premolar, first molar, and second molar. For females, the sequence from lowest to the highest was third molar, canine, second premolar, first premolar, central incisor, first molar, and second molar. Conclusions: Dental maturation stages can be used as a reliable indicator of facial growth.
  • [ X ]
    Öğe
    Dental Aesthetic Index scores and perception of personal dental appearance among Turkish university students
    (Oxford Univ Press, 2009) Hamamci, Nihal; Basaran, Guvenc; Uysal, Ersin
    The aim of this study was to investigate the relationship between Turkish university students' awareness of malocclusion, their satisfaction with their personal dental appearance, and the severity of their occlusal irregularities. The sample consisted of 841 randomly selected university students, 522 (62.1 per cent) males and 319 (37.9 per cent) females, aged 17-26 years (mean age, 21.91 +/- 1.92 years). A pre-tested questionnaire was used to assess the subjects' awareness of malocclusion and satisfaction with their personal dental appearance; the actual severity of malocclusion was determined using the Dental Aesthetic Index (DAI). Statistical analysis was carried out using chi-square for gender differences and Spearman rank-order correlation coefficients for awareness of malocclusion, satisfaction with personal dental appearance, and DAI scores. Analysis of variance and univariate analysis, with age and gender as the independent variables, were further used to analyse the data. Weak but statistically significant, negative, correlations were found between awareness of malocclusion and satisfaction at the following DAI scores: <= 25 (r = -0.264, P < 0.001), 26-30 (r = -0.381, P < 0.001), and >= 36 (r = -0.477, P < 0.001), and a statistically insignificant, negative correlation at a score of 31-35 (r = -0.102, P > 0.05). A statistically significant association was found between DAI and awareness of malocclusion (r = -0.305) and satisfaction with dental appearance (r = 0.234). There were no significant associations between the department in which the individuals studied and the investigated variables (P > 0.05). DAI scores were significantly higher for females. Generally, no statistically significant gender differences were found in relation to DAI scores, awareness, or satisfaction (P > 0.05). The findings of this study showed that age had a significant effect on satisfaction and gender on DAI score variation. Females had a greater need for normative treatment except in the 20- to 22-year-olds, and satisfaction decreased with age.
  • [ X ]
    Öğe
    The Effects of Extraction and Non-Extraction Treatment on RME Applied Patients
    (Aves Press Ltd, 2010) Hamamci, Nihal; Akkurt, Atilim; Dogru, Mehmet; Veli, Ilknur; Hamamci, Orhan
    Aim: The aim of this study was to compare the dentoalveolar, skeletal and soft tissue effects of upper two premolar extraction or nonextraction treatments after Rapid Maxillary Expansion (RME). Subjects and Methods: The sample of this study consisted of pre and posttreatment lateral cephalometric radiographs of 21 patients characterized by narrow maxilla and treated with or without extraction following RME. In our study, RME applied patients were divided into two groups as extraction and nonextraction. After adequate expansion and retention period, two upper first premolars were extracted in extraction group and no teeth were extracted in nonextraction group. Thereafter, fixed orthodontic treatment was started in two groups. Results: At the end of treatment when extraction and nonextraction groups were compared, significant differences in A1 inclination to A-Po angle (p < 0.01), A1 to A-Po plane (p < 0.05) and B1 to A-Po plane distance (p < 0.05) representing the dentoalveolar incisor position were detected. Also statistically no significant differences were found between parameters related to lips or soft tissues. Our results do not support the idea that more retrusive profile occurs as a result of upper extraction treatment. Conclusions: In the light of these results, it is possible to say that there is no esthetic difference between the RME appliances patient treated by either upper premolar extraction or nonextraction treatment.
  • [ X ]
    Öğe
    Identification of interleukin 2, 6, and 8 levels around miniscrews during orthodontic tooth movement
    (Oxford Univ Press, 2012) Hamamci, Nihal; Kaya, Filiz Acun; Uysal, Ersin; Yokus, Beran
    The aim of this study was to identify the levels of interleukin (IL)-2, IL-6, and IL-8 around miniscrews used for anchorage during canine distalization. Sixteen patients (eight males and eight females; mean age, 16.6 +/- 2.4 years) who were treated with bilateral upper first premolar extractions were included in the study. Thirty-two maxillary miniscrew implants were placed bilaterally in the alveolar bone between the maxillary second premolars and first molars as anchorage units for maxillary canine distalization. Three groups were constructed. The treatment, miniscrew, and control groups consisted of upper canines, miniscrew implants, and upper second premolars, respectively. Peri-miniscrew implant crevicular fluid and gingival crevicular fluid (GCF) were obtained at baseline (T1) and at 1 (T2), 24 (T3), and 48 (T4) hours, 7 (T5) and 21 (T6) days, and 3 months (T7) after force application. Paired sample t-tests were used to determine within-group changes and Dunnett's t and Tukey's honestly significant difference tests for between-group multiple comparisons. During the 3 month period, IL-2 levels significantly increased (P < 0.01) but only in the treatment group after 24 hours. IL-6 levels were unchanged at all times points in the three groups. IL-8 levels increased significantly at 1 (P < 0.05), 24 (P < 0.01), and 48 (P < 0.01) hours in the treatment group and at 24 (P < 0.05) and 48 (P < 0.01) hours in the miniscrew group. It appears that miniscrews can be used for anchorage in orthodontics when correct physiological forces are applied.
  • [ X ]
    Öğe
    Identification of tumor necrosis factor- ? levels around miniscrews during canine distalization
    (Korean Assoc Orthodontists, 2011) Kaya, Filiz Acun; Hamamci, Nihal; Uysal, Ersin; Yokus, Beran
    Objective: The aim of this study was to measure tumor necrosis factor- alpha (TNF- alpha) levels around miniscrews used for anchorage during a 3-month period of canine distalization. Methods: Sixteen patients (8 boys, 8 girls; mean age, 16.6 +/- 2.4 years) whose upper first premolars were extracted for orthodontic treatment were included in this study. Miniscrews were used as an anchorage unit in canine distalization. Thirty-two (32) miniscrew implants were placed bilaterally in the alveolar bone between the maxillary second premolars and first molars. The treatment, miniscrew, and control groups comprised upper canines, miniscrew implants, and upper first premolars, respectively. Peri-miniscrew implant crevicular fluid and gingival crevicular fluid were obtained before applying force and at 1, 24, and 48 hours, and at 7 and 21 days, and 3 months after applying force. Results: During the 3-month period, the TNF- alpha levels increased significantly at 24 hours only in the treatment group (p < 0.01). In the miniscrew and control groups, there were no statistically significant changes. No significant differences were observed between groups. Conclusions: Miniscrews can be conveniently used for anchorage in orthodontics. (Korean J Orthod 2011;41(1):36-41)
  • [ X ]
    Öğe
    In vitro evaluation of microleakage under orthodontic brackets using two different laser etching, self etching and acid etching methods
    (Springer London Ltd, 2010) Hamamci, Nihal; Akkurt, Atilim; Basaran, Guevenc
    This study evaluated the microleakage of brackets bonded by four different enamel etching techniques. Forty freshly extracted human premolars were divided randomly into four equal groups and received the following treatment: group 1, acid etching; group 2, self-etching primer (SEP); group 3, erbium:yttrium-aluminum-garnet (Er:YAG) laser etching; and group 4, erbium, chromium:yttrium-scandium-gallium-garnet (Er,Cr:YSGG) laser etching. After photopolymerization, the teeth were kept in distilled water for 1 month and then subjected to 500 thermal cycles. Then, the specimens were sealed with nail varnish, stained with 0.5% basic fuchsin for 24 h, sectioned, and examined under a stereomicroscope. In addition, they were scored for marginal microleakage at the adhesive-enamel and bracket-adhesive interfaces from the incisal and gingival margins. Statistical analyses consisted of the Kruskal-Wallis test and the Mann-Whitney U test with Bonferroni correction. Microleakage occurred between the adhesive-enamel and bracket-adhesive interfaces in all groups. For the adhesive-enamel surface, a significant difference was observed between group 1 and groups 2 (P = 0.011), 3 (P = 0.002), and 4 (P = 0.000) on the gingival side. Overall, significant differences were observed between group 1 and groups 3 (P = 0.003) and 4 (P = 0.000). In dental bonding procedures, acid etching was found to result in the least microleakage. Since etching with a laser decreases the risk of caries and is time-saving, it may serve as an alternative to acid etching.
  • [ X ]
    Öğe
    Longitudinal profile changes in an Anatolian Turkish population
    (Oxford Univ Press, 2010) Hamamci, Nihal; Arslan, Seher Guenduez; Sahin, Semra
    A total of 30 subjects (15 females and 15 males) with an Angle Class I occlusal relationship and normal antero-posterior (ANB, 2-4 degrees) skeletal relationships were selected from the archive of Dicle University. All subjects were of Anatolian Turkish heritage, and none had any apparent facial disharmony or had undergone orthodontic therapy. Lateral cephalometric radiographs taken at T1 (mean age 8.8 years), T2 (mean age 13.8 years), and T3 (mean age 17.8 years) were separately investigated. Non-gender-specific research was also carried out at the same time periods. In total, 24 measurements were analysed longitudinally. Differences between the genders were determined using independent t-tests. Repeated measures analysis of variance tests were used to evaluate repeated measurements, and paired sample t-tests to compare inside effects between the genders. Significant increases (P < 0.05) were found with age for both females and males. Generally, the increases were greater in males than in females. Nasal prominence increased more than chin prominence, resulting in a tendency to have convex profiles.
  • [ X ]
    Öğe
    Longitudinal Skeletal Changes in a Turkish Anatolian Population
    (Aves Press Ltd, 2009) Hamamci, Nihal; Gunduz Arslan, Seher; Sahin, Semra
    The goal of this study was to detect the growth changes in the maxilla and mandible of Turkish Anatolian subjects by using frequently analyzed measurements in orthodontic diagnosis. 30 subjects (15 males and 75 females) with Angle class 1 occlusal relationship, and normal anteroposterior (ANB, 2-4 degrees) and vertical (SN-GoGn, 32 5 degrees) skeletal relationships selected from the university archive were included in this study. Lateral cephalometric radiographs of subjects taken at T-1 (mean age 8.8 years), T-2 (mean age 13.8 years) and T3 (mean age 17.8 year) periods were investigated with gender difference and also research was carried out without gender difference at the same time periods. A total of fifteen measurements were analyzed longitudinally. As a result of our study, all values except ANB angle in girls and except Y-axis angle in boys showed statistically significant changes. Between boys and girls, significant differences were found in Y-axis angle in the period of T-1; in Y-axis angle, AN5-PNS,. ANSPN5-P measurements in the period of T2, and in ANB angle, ANSPNS, ANSPNS-P, Co-A and Co-Gn measurements in the period of T3. Similar results were found in other measurements except these between boys and girls. In conclusion, boys and girls showed similar findings in angular measurements, but only Y-axis angle was statistically greater in girls than in boys in the periods of T-1 and T-2. This showed an early vertical mandibular growth in girls than in boys. In linear measurements, boys generally showed greater results than girls.
  • [ X ]
    Öğe
    Nonsurgical orthodontic treatment of an adolescent girl with Class III malocclusion and asymmetric maxillary narrowing
    (Mosby-Elsevier, 2008) Hamamci, Nihal; Basaran, Guevenc; Tumen, E. Caner; Ozdemir, Eylem
    Class III malocclusion is a difficult anomaly to understand. Because not all Class III patients are candidates for surgical correction, patient assessment and selection are especially important in diagnosis and treatment planning. In this article, we report the orthopedic treatment of a teenage girl with a severe skeletal Class III malocclusion. Her ANB angle was -4.5 degrees, and she had a 2-mm anterior crossbite, a 1-mm overbite, and a posterior asymmetric crossbite (greater on the left side). The patient refused surgery. We used a rapid palatal expansion appliance to expand the maxilla, standard edgewise brackets to align the teeth, and reverse headgear to bring the maxilla forward. We performed symmetric expansion, but, because of the asymmetric crossbite in the maxilla, we designed a modified apparatus that permitted greater relapse on 1 side. In this way, the posterior crossbite was ideally corrected by the end of treatment, and ideal overjet and overbite relationships, functional occlusion, and an esthetic facial appearance were all achieved.
  • [ X ]
    Öğe
    Oral Manifestations of Lamellar Ichthyosis; A Case Report
    (Iranian Scientific Society Medical Entomology, 2009) Bolgul, Behiye; Hamamci, Nihal; Akdeniz, Sedat; Celenk, Sema
    Background: The name ichthyosis is derived from the Greek ikhthus meaning fish and refers to the similarity in appearance of the skin to fish scale. The ichthyoses are a heterogeneous group of disorders. There are few studies about the oral manifestations of these disorders. But early reports of ichthyosis in the Indian and Chinese literature date back to several hundred years. Case Presentation: Oral manifestations of the 14-year-old female patient with ichthyosis are presented. Physical examination revealed thick, brownish scales covering the entire body surface including all larger body flexures and corneae. She had short and dry hair. There were no nail abnormalities and hearing loss. Conclusion: We consider that this patient represents a new manifestation of lamellar ichthyosis disease, because congenitally teeth missing and cephalometric analysis measurements have not been reported before.
  • [ X ]
    Öğe
    Shear bond strength of bonding to enamel with different laser irradiation distances
    (Springer London Ltd, 2011) Basaran, Guvenc; Hamamci, Nihal; Akkurt, Atilim
    The aim of this study was to investigate the shear bond strength of bonding to enamel following laser etching with the Er:YAG or Er,Cr:YSGG laser using different irradiation distances. Of 99 extracted human premolar teeth, 90 were divided equally into nine groups. In the control group (group A) the teeth were etched with 38% phosphoric acid. In the laser groups (groups B-I) the enamel surface of the teeth was laser-irradiated, groups B-E with the Er:YAG laser and groups F-I with the Er,Cr:YSGG laser at distances of 1, 2, 4 and 6 mm, respectively. The shear bond strengths were tested using a universal testing machine. The shear bond strengths associated with the Er:YAG laser at 4 and 6 mm and the Er,Cr:YSGG laser at 2, 4 and 6 mm were significantly less than the strengths obtained with the other irradiation distances (p < 0.001). The Er:YAG laser at 1 mm and the Er,Cr:YSGG laser at 1 mm etched enamel in the same manner (p > 0.05). This finding was confirmed by scanning electron microscopy examination. Irradiation distance did influence the strength of adhesion to enamel. The mean shear bond strengths and enamel surface etching obtained with the Er:YAG laser at 1 and 2 mm and the Er,Cr:YSGG laser at 1 mm were comparable to that obtained with acid etching.