Noncompliance screw supported maxillary molar distalization in a parallel manner

Ruhi Nalc¸aci,Ali Altug˘ Bic¸akci,Fatih Ozan 대한치과교정학회 2010 대한치과교정학회지 Vol.40 No.4

Objective: Intraoral noncompliance upper molar distalization techniques have gained in popularity and have subsequently found to be successful in ClassⅡ correction. The aim of the present study was to introduce a screw supported intraoral distalization appliance and investigate its efficiency. Methods: Twenty-one subjects (11 females, 10 males; average age of 14.9 years) with Angle ClassⅡ malocclusion participated in this study. Two screws were inserted behind the incisive foramen and immediately loaded to distalize the upper first molars. An intraoral screw supported distalization appliance was used to distalize the upper molars in order to achieve a ClassⅠ molar relationship. Skeletal and dental changes were evaluated using cephalometric and three-dimensional (3D) model analysis. Results: Upper molars were distalized 3.95 mm on average and a ClassⅠ molar relationship was achieved without any anchorage loss. The upper molars were tipped only and the upper right and left molars were rotated only 1.49˚ and the upper right and left molars were rotated only 0.54˚ and 0.74˚ respectively which were statistically non-significant (p > 0.05). Conclusions: The newly designed screw supported noncompliance distalization appliance was found to be an effective device for achieving bodily molar distalization without any anchorage loss. 상악 구치의 후방이동을 위한 구강 내 장치 중 환자의 협조를 필요로 하지 않는 방법은 제Ⅱ급 부정교합의 개선에 성공적으로 널리 사용되고 있다. 본 연구는 스크류에 의해 지지되는 구강 내 후방이동 장치를 소개하고 그 효율성을 조사하고자 하였다. Angle ClassⅡ 부정교합으로 진단된 21명의 환자(여자 11명, 남자 10명; 평균 연령 14.9세)를 대상으로 하였다. 2개의 스크류를 incisive foramen 후방에 식립하고, 식립한 즉시 힘을 주어 상악 제1대구치의 후방이동에 사용하였다. 상악 구치를 후방이동시켜 제Ⅰ급 구치관계를 얻기 위해 스크류에 의해 지지되는 구강 내 후방이동 장치를 사용하였다. 치료 전후 측모두부 방사선 사진과 3차원 모델 분석을 통해 골격 및 치아의 변화를 평가하였다. 연구결과 상악 구치는 평균 3.95 mm 후방이동하였고, 추가적인 고정원 소실 없이 제Ⅰ급 구치관계를 확립하였다. 상악 대구치는 1.49˚후방경사 되었고, 회전된 정도는 좌우 각각 0.54˚, 0.74˚ 으로 통계적으로 유의성 있는 변화를 보이지 않았다 (p > 0.05). 새롭게 고안된 장치는 스크류에 의해 지지되어 환자의 협조도를 요하지 않으며 특별한 고정원 소실 없이 구치의 치체이동을 통한 후방이동을 얻는데 효과적인 것으로 판단된다.

A reliable method for evaluating upper molar distalization

Ruhi Nalcaci,Ayse Burcu Kocoglu-Altan,Ali Altug Bicakci,Firat Ozturk,Hasan Babacan 대한치과교정학회 2015 대한치과교정학회지 Vol.45 No.2

Objective: The aim of this study was to evaluate the reliability of measurements obtained after the superimposition of three-dimensional (3D) digital models by comparing them with those obtained from lateral cephalometric radiographs and photocopies of plaster models for the evaluation of upper molar distalization. Methods: Data were collected from plaster models and lateral cephalometric radiographs of 20 Class II patients whose maxillary first molars were distalized with an intraoral distalizer. The posterior movements of the maxillary first molars were evaluated using lateral cephalometric radiographs (group CP), photocopies of plaster models (group PH), and digitized 3D models (group TD). Additionally, distalization and expansion of the other teeth and the degrees of molar rotation were measured in group PH and group TD and compared between the two groups. Results: No significant difference was observed regarding the amount of molar distalization among the three groups. A comparison of the aforementioned parameters between group PH and group TD did not reveal any significant difference. Conclusions: 3D digital models are reliable to assess the results of upper molar distalization and can be considered a valid alternative to conventional measurement methods.

Lateral buckling of reinforced concrete beams without lateral support

Aydin, Ruhi,Kirac, Nevzat Techno-Press 1998 Structural Engineering and Mechanics, An Int'l Jou Vol.6 No.2

Reinforced concrete beams possess variable flexural and torsional stiffnesses due to formation of cracks in the tension area along the beam. In order to check the stability of the beam, it is thus more appropriate to divide the beam into a finite number of segments for which mean stiffnesses and also bending moments are calculated. The stability analysis is further simplified, by using these mean values for each segment. In this paper, an algorithm for calculating the critical lateral buckling slenderness ratio for a definite load level, in a reinforced concrete beam without lateral support at the flanges, is presented. By using this ratio, the lateral buckling safety level of a slender beam may be checked or estimated.

Elastic Flexural and Lateral Torsional Buckling Analysis of Frames Using Finite Elements

M. Ruhi Aydin 대한토목학회 2010 KSCE JOURNAL OF CIVIL ENGINEERING Vol.14 No.1

A stiffness matrix has been developed for the elements of framed systems which are under constant axial force and moment. A global stiffness matrix can be obtained by using this stiffness matrix and the classical finite element techniques. The constant axial force and moment which will be used in the element stiffness matrix are obtained from a preliminary solution. These internal forces are then increased proportionally and new element stiffness matrices are calculated. Due to the increasing external loads excessive displacements, rotations and finally change of directions of these displacements and rotations occur. The external load conditions for this phase, give us the critical buckling load of the system. Within this framework an application is presented for the critical flexural and lateral torsional buckling loads of second-degree parabolic arches. This buckling loads of arches are compared with the specifications of the Eurocode 3, Part 2, Annex D, design of steel structures ENV 1993-1-1 and given some interpretations about the linear and non-linear analysis.

Noncompliance screw supported maxillary molar distalization in a parallel manner

Nalcaci, Ruhi,Bicakci, Ali Altug,Ozan, Fatih The Korean Association Of Orthodontists 2010 대한치과교정학회지 Vol.40 No.4

상악 구치의 후방이동을 위한 구강 내 장치 중 환자의 협조를 필요로 하지 않는 방법은 제II급 부정교합의 개선에 성공적으로 널리 사용되고 있다. 본 연구는 스크류에 의해 지지되는 구강 내 후방이동 장치를 소개하고 그 효율성을 조사하고자 하였다. Angle Class II 부정교합으로 진단된 21명의 환자(여자 11명, 남자 10명; 평균 연령 14.9세)를 대상으로 하였다. 2개의 스크류를 incisive foramen 후방에 식립하고, 식립한 즉시 힘을 주어 상악 제1대구치의 후방이동에 사용하였다. 상악 구치를 후방이동시켜 제I급 구치관계를 얻기 위해 스크류에 의해 지지되는 구강 내 후방이동 장치를 사용하였다. 치료 전후 측모두부 방사선 사진과 3차원 모델 분석을 통해 골격 및 치아의 변화를 평가하였다. 연구결과 상악 구치는 평균 3.95 mm 후방이동하였고, 추가적인 고정원 소실 없이 제I급 구치관계를 확립하였다. 상악 대구치는 $1.49^{\circ}$ 후방경사 되었고, 회전된 정도는 좌우 각각 $0.74^{\circ}$, $0.54^{\circ}$으로 통계적으로 유의성 있는 변화를 보이지 않았다 (p > 0.05). 새롭게 고안된 장치는 스크류에 의해 지지되어 환자의 협조도를 요하지 않으며 특별한 고정원 소실 없이 구치의 치체이동을 통한 후방이동을 얻는 데 효과적인 것으로 판단된다. Objective: Intraoral noncompliance upper molar distalization techniques have gained in popularity and have subsequently found to be successful in Class II correction. The aim of the present study was to introduce a screw supported intraoral distalization appliance and investigate its efficiency. Methods: Twenty-one subjects (11 females, 10 males; average age of 14.9 years) with Angle Class II malocclusion participated in this study. Two screws were inserted behind the incisive foramen and immediately loaded to distalize the upper first molars. An intraoral screw supported distalization appliance was used to distalize the upper molars in order to achieve a Class I molar relationship. Skeletal and dental changes were evaluated using cephalometric and three-dimensional (3D) model analysis. Results: Upper molars were distalized 3.95 mm on average and a Class I molar relationship was achieved without any anchorage loss. The upper molars were tipped only $1.49^{\circ}$ and the upper right and left molars were rotated only $0.54^{\circ}$ and $0.74^{\circ}$ respectively which were statistically non-significant (p > 0.05). Conclusions: The newly designed screw supported noncompliance distalization appliance was found to be an effective device for achieving bodily molar distalization without any anchorage loss.

Association of +405C>G and +936C>T Polymorphisms of the Vascular Endothelial Growth Factor Gene with Sporadic Breast Cancer in North Indians

Kapahi, Ruhi,Manjari, Mridu,Sudan, Meena,Uppal, Manjit Singh,Singh, Neeti Rajan,Sambyal, Vasudha,Guleria, Kamlesh Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.1

Background: Vascular endothelial growth factor (VEGF), an endothelial cell specific mitogen, has been implicated as a critical factor influencing tumor related angiogenesis. The aim of present study was to evaluate the relationship between VEGF +936C>T and +405C>G polymorphisms of VEGF with risk of breast cancer in Punjab, India. Materials and Methods: We screened DNA samples of 192 sporadic breast cancer patients and 192 unrelated healthy, gender and age matched control individuals for VEGF +936C>T and +405C>G polymorphisms using the PCR-RFLP method. Results: For the VEGF +405C>G polymorphism, we observed significantly increased frequency of GG genotype in cases as compared to controls and strong association of +405GG genotype was observed with three fold risk for breast cancer (OR=3.07; 95%CI 1.41-6.65; p=0.003). For the +936C>T polymorphism, significant associations of CT and combined CT+TT genotypes were observed with elevated risk of breast cancer (p=0.021; 0.023). The combined genotype combinations of GG-CC and GG-CT of +405C>G and +936C>T polymorphisms were found to be significantly associated with increased risk of breast cancer (p=0.04; 0.0064). Conclusions: The findings of the present study indicated significant associations of VEGF +936C>T and +405C>G polymorphisms with increased breast cancer risk in patients from Punjab, North India.

Pancreatic Islet Cell Amyloidosis Manifesting as a Large Pancreas

Mehmet Ruhi Onur,Mehmet Yalnız,Ahmet Kursad Poyraz,Ibrahim Hanifi Özercan,Yusuf Ozkan 대한영상의학회 2012 Korean Journal of Radiology Vol.13 No.1

A 39-year-old female patient presented to our hospital with epigastric pain lasting for two months. Laboratory results showed impaired glucose tolerance. Ultrasonography of the patient showed a hypoechoic, diffusely enlarged pancreas. CT revealed a large pancreas, with multiple calcifications. On MRI, a diffusely enlarged pancreas was seen hypointense on both T1- and T2-weighted images with heterogeneous enhancement after gadolinium administration. A biopsy of the pancreas revealed primary amyloidosis of islet cells. Decreased signal on T1-weighted images without inflammation findings on CT and MRI were clues for the diagnosis.

Intensity and temperature dependence of photocurrent of a-Si:H Schottky diodes

Mehmet ?ahin,Ruhi Kaplan 한국물리학회 2006 Current Applied Physics Vol.6 No.1

The photocurrent of hydrogenated amorphous silicon (a-Si:H) Schottky diode has been studied as a function of light intensityfrom a HeNe laser, applied electric bias, and temperature, by using a constant photocurrent method. TheIVcharacteristics andthus ll factor (FF) values were also obtained over the temperature range 173297 K. The FF increases very little as the temperatureis decreased. The exponentc in the power relationshipIph . Gc between photocurrent and light intensity was found to be temper-ature and electric eld dependent, and peaked around 260 K measured. The activation energy obtained from thermally activatedphotocurrent was also found to be electric eld dependent. These experimental results are discussed by means of the inuence ofthe trapping of charge carriers on the electric eld prole.

Gene and protein expression of epithelial to mesenchymal transition for intestinal and anal fistula: a systematic review

Osman Nadila Haryani,Jailani Ruhi Fadzlyana,Rahman Hayati Abd,Hamid Nazefah Abdul 대한대장항문학회 2023 Annals of Coloproctolgy Vol.39 No.2

Purpose: Intestinal fibrosis is a common complication of inflammatory bowel diseases. However, the possible involvement of epithelial-mesenchymal transition (EMT) has been scarcely investigated. This systematic review aims to search through research papers that are focusing on messenger RNA (mRNA) and protein expression profile in EMT in fistula or in intestinal fibrosis.Methods: Electronic exploration was performed until April 24, 2019 through PubMed, Ovid, Science Direct, and Scopus databases with the terms of “fistula” OR “intestinal fibrosis” AND “epithelial-mesenchymal transition”. Two independent reviewers scrutinized the suitability of the title and abstract before examining the full text that met the inclusion criteria. For each study, the sample types that were used, methods for analysis, and genes expressed were identified. The list of genes was further analyzed using DAVID (Database for Annotation, Visualization, and Integrated Discovery) and KEGG (Kyoto Encyclopedia of Genes and Genomes) pathway.Results: There were 896 citations found; however, only 3 studies fulfilled the requirements. Among the EMT-related genes, 5 were upregulated genes at mRNA level while 6 were at protein level. However, only 2 downregulated genes were found at each mRNA and protein level. Of the 4 inflammation-related genes found, 3 genes were upregulated at mRNA level and 1 at protein level. These genes were confirmed to be involved in the development of inflammatory induced fibrosis and fistula through EMT. Results from quantitative real-time polymerase chain reaction analysis were consistent with the process of EMT, confirmed by the western blot protein analysis.Conclusion: Many significant genes which are involved in the process of EMT in fistula and intestinal fibrosis have been identified. With high-end technology many more genes could be identified. These genes will be good molecular targets in the development of biomarkers for precision drug targeting in the future treatment of intestinal fibrosis and fistula.

Comparison of retention characteristics of Essix and Hawley retainers

Abdullah Demir,Hasan Babacan,Ruhi Nalcacı,Tolga Topcuoglu 대한치과교정학회 2012 대한치과교정학회지 Vol.42 No.5

Objective: We aimed to compare the retention characteristics of Essix and Hawley retainers. Methods: Adolescents undergoing fixed appliance treatment at 2 centers were recruited for this study. Twenty-two patients (16 women and 6 men) wore Essix retainers (Essix group) while 20 (14 women and 6 men) wore Hawley retainers (Hawley group). The mean retention time was 1 year, and the mean follow-up recall time for both groups was 2 years. Two qualified dental examiners evaluated the blind patient data. Maxillary and mandibular dental casts and lateral cephalograms were analyzed at 4 stages: pretreatment (T1), post-treatment (T2), post-retention (T3), and follow-up (T4). Results: The results revealed that Essix appliances were more efficient in retaining the anterior teeth in the mandible during a 1-year retention period. The irregularity index increased in both arches in both groups after a 2-year post-retention period. The mandibular arch lengths increased during treatment and tended to return to their original value after retention in both groups; however, these changes were statistically significant only in the Hawley group. Cephalometric variables did not show any significant differences. Conclusions: The retention characteristics of both Essix and Hawley retainers are similar.