The aim of this study was to test the null hypothesis that increased irregularity of the mandibular incisors is associated with a reduction in the alveolar support on cone-beam computed tomographic sections.
From a sample of 1100 digital volumetric tomographs, 125 tomographs of subjects with Class I malocclusion (mean age, 21.6 ± 4.8 years) were selected for this study. An irregularity index was used to categorize these tomographs as having mild, moderate, or severe crowding. All tomographs were taken by using an iCAT (Imaging Sciences International, Hatfield, Pa) imaging device. The following parameters we . . .re measured on the sections corresponding to the 4 mandibular incisors with the iCAT software: height, thickness, and area of the entire symphysis; height, thickness, and area of the cancellous bone of the symphysis; and distance between the vestibular and lingual cortices. For the statistical evaluation, independent samples t test, analysis of variance, and the Tukey HSD test were used at an alpha level 0.05. The Pearson correlation coefficient and a simple linear regression were calculated to determine the relationship between mandibular anterior bony support and incisor crowding.
Almost all mandibular anterior bone measurements were greater in the male subjects than in the female subjects (height of the mandibular symphysis, P
Objective: To test the hypotheses that (1) there is no difference in mandibular asymmetry between
the crossbite and normal side in a unilateral crossbite group (UCG) and between the right and left
sides in a bilateral crossbite group (BCG) and a control group (CG); and (2) there is no significant
difference in mandibular asymmetry among crossbite groups and control group.
Materials and Methods: The cone-beam computed tomography scans of three groups were
studied: (1) 15 patients (6 male, 9 female; mean age: 13.51 6 2.03 years) with unilateral posterior
crossbite; (2) 15 patients (8 male, 7 female; mean age: 13.36 6 2.12 years) . . . with bilateral posterior
crossbite; and (3) 15 patients (8 male, 7 female; mean age: 13.46 6 1.53 years) as a control group.
Fourteen parameters (eight linear, three surface, and three volumetric) were measured. Side
comparisons were analyzed with paired samples t-test, and for the intergroup comparison, analysis
of variance (ANOVA) and Tukey tests were used at the P , .05 level.
Results: According to side comparisons, no statistically significant difference was found in the
UCG. There were statistically significant differences in hemimandibular (P 5 .008) and ramal (P 5
.004) volumes for the BCG and in ramal height (P 5 .024) and body length (P 5 .021) for the CG.
Intergroup comparisons revealed significant differences in hemimandibular (P 5 .002) and body
volume (P , .001) for the normal side of the UCG and left sides of the other groups, and in angular
unit length (P 5 .025) and condylar width (P 5 .007) for the crossbite side of the UCG and the right
sides of the other groups.
Conclusions: Contrary to UCG, CG and BCG were found to have side-specific asymmetry.
Skeletal components of the mandible have significant asymmetry among the crossbite groups and
Objective: To test the null hypothesis that the presence of alveolar defects (dehiscence and
fenestration) was not different among patients with different vertical growth patterns.
Materials and Methods: A total of 1872 teeth in 26 hyper-divergent (mean age: 24.4 6 4.8 years),
27 hypo-divergent (mean age: 25.1 6 4.5 years), and 25 normo-divergent (mean age: 23.6 6
4.1 years) patients with no previous orthodontic treatment were evaluated using cone-beam
computed tomography. Axial and cross-sectional views were evaluated with regard to whether
dehiscence and/or fenestration on buccal and lingual surfaces existed or not. For stat . . .istical
analysis, the Pearson chi-square test was used at a P , .05 significance level.
Results: According to the statistical analysis, the hypo-divergent group (6.56%) had lower
dehiscence prevalence than the hyper-divergent (8.35%) and normo-divergent (8.18%) groups
(P 5 .004). Higher prevalences of dehiscence and fenestration were found on buccal sides in all
vertical growth patterns. While fenestration was a common finding for the maxillary alveolar region,
dehiscence was a common finding in the mandible in all groups.
Conclusion: The null hypothesis was rejected. Although the prevalence of fenestrations was not
different, significant differences for dehiscences were found in patients with different vertical growth
Introduction: The aim of this study was to determine the peri-miniscrew implant crevicular fluid receptor
activator of nuclear factor-lB ligand (RANKL) and osteoprotegerin (OPG) levels around loaded and unloaded
miniscrew implants at different time intervals. Methods: Twenty loaded and 16 unloaded miniscrew implants
were included in this study. All miniscrew implants were placed bilaterally between the maxillary second premolars
and first molars as anchorage units for canine distalization. Peri-miniscrew implant crevicular fluid was taken
from the mesiobuccal aspects of the loaded and unloaded miniscrew implants before loading; . . . at 24, 48, and 168
hours; and on day 30 after force application. Enzyme-linked immunosorbent assay kits were used to determine
RANKL and OPG levels in the peri-miniscrew implant crevicular fluid samples. Wilcoxon, Mann-Whitney U, and
Spearman correlation tests were used for statistical evaluations at the P\0.05 level. Results: Although the total
amount of OPG was not different between the groups, the total amount of RANKL was significantly elevated in
the loaded miniscrew implant group (P\0.05) at all time periods. Peri-miniscrew implant crevicular fluid volume
was the highest at 48 hours in the loaded group. Also, the OPG/RANKL ratio in the peri-miniscrew implant
crevicular fluid was significantly decreased in the loaded miniscrew implant group. Conclusions: The OPG
and RANKL levels vary around loaded and unloaded miniscrew implants as a result of force application
Objective: To determine whether there is any difference between the cleft and non-cleft sides of the mandible
in unilateral cleft lip and palate (UCLP) patients, or the right and left sides in control patients; and
to determine if there is any difference between the mandibular asymmetry of UCLP patients and that of
control patients. Methods: We examined cone-beam computed tomography (CBCT) scans of 15 patients
with UCLP and 15 age- and gender-matched control patients. We evaluated 8 linear, 3 surface, and 3 volumetric
measurements and compared the cleft/non-cleft sides of UCLP patients and the right/left sides of
controls. Res . . .ults: There were no statistically significant gender differences in any linear, surface, or volumetric
measurement. The single significant side-to-side difference in UCLP patients was a longer coronoid
unit on the cleft side than on the non-cleft side (p = 0.046). Body volume was significantly lower in the
UCLP group than in the control group (p = 0.008). Conclusions: In general, UCLP patients have symmetrical
mandibles, although the coronoid unit length is significantly longer on the cleft side than on the
non-cleft side. UCLP patients and controls differed only in body volume
İzmir Katip Çelebi Üniversitesi, akademisyen ve lisansüstü öğrencilerinin iç ve dış paydaşlarla birlikte ürettikleri bilimsel çalışmalarını, Akademik Açık Arşivi'nde dijital olarak yayınlayarak, ülke ve dünya genelinde bilim topluluğuna açık erişim sağlamaktadır.
Akademik Açık Arşivi'nde bulunan tüm kaynaklar, telif haklarına saygı gösterilerek ve açık erişim ilkeleri doğrultusunda yayınlanmaktadır.
İzmir Katip Çelebi Üniversitesi, bilimsel bilgiye erişimi kolaylaştırarak, araştırma sonuçlarını ve bilimsel yayınları geniş bir kitleye sunarak bilimsel gelişmelere katkıda bulunmayı amaçlamaktadır.
Giriş işlemi için kütüphane hesabı kullanıcı adı ve şifrenizi veya UBYS bilgilerinizi kullanarak işleminize devam edebilirsiniz.
6698 sayılı Kişisel Verilerin Korunması Kanunu kapsamında yükümlülüklerimiz ve çerez politikamız hakkında bilgi sahibi olmak için alttaki bağlantıyı kullanabilirsiniz.