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Zeitschriftenartikel zum Thema „Arch form“

Autor: Grafiati

Veröffentlicht am 4. Juni 2021

Zuletzt aktualisiert am 1. Februar 2022

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1

Al-Zubair, Nabil M. „Establishment of Yemeni Dental Arch Form“. Orthodontic Journal of Nepal 3, Nr. 2 (31.12.2013): 22–26. http://dx.doi.org/10.3126/ojn.v3i2.10073.

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Objective: To assess the dental arch forms of Yemeni adult sample. Materials & Method: The Eucledian clustering method of analysis was utilized for the determination of dental arch form. A total of 398 study models were constructed and evaluated to do measurements for both arches using a modified sliding caliper gauge. Six dental cast measurements divided into three sagittal and three transverse measurements were utilized to represent the dental arch width and length measurements. Result: Narrow form is the most prevalent arch form (30.9%) followed by wide form (23.9%), their prominence appear more in females and the least prevalent arch form was the mid form (9.3%), while flat and pointed forms were in between 18.3% and 17.6% respectively. Conclusion: Five arch forms: narrow, wide, mid, pointed and flat were distinguished as unique forms for the dental arches, with the predominance of the narrow arch form were found among Yemeni adults.

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2

UENO, Kentaro, Shunji KUMABE, Michiko NAKATSUKA und Isao TAMURA. „Factors influencing dental arch form“. Okajimas Folia Anatomica Japonica 96, Nr. 1 (2019): 31–46. http://dx.doi.org/10.2535/ofaj.96.31.

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3

Shrestha, Rabindra Man. „Polynomial Analysis of Dental Arch Form of Nepalese Adult Subjects“. Orthodontic Journal of Nepal 3, Nr. 1 (05.12.2013): 7–13. http://dx.doi.org/10.3126/ojn.v3i1.9267.

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Introduction: Human dental arch acquires stable form and dimensions with the attainment of adulthood. The orthodontic treatment regimen signifies the predetermination of the shape and type of dental arch form of a particular adult population to harmonize with their natural pattern. The use of predetermined arch form helps in diagnosis, treatment planning and stability of orthodontic treatment results. Objective: To analyze the dental arch forms of Nepalese adults and to classify them into morphological types. Materials & Method: Predetermined transverse and sagittal dimensions on dental stone models of one hundred Nepalese adults aged 17-32 years with normal occlusion and dentofacial proportion were measured using standardized Boley gauze. The analysis was done according to Raberin’s mathematical sixth degree polynomial method. The study compared the gender difference among the Nepalese samples. Result: The distribution of the Nepalese arch form types were; 26% flat arch, 24% wide arch, 19% pointed arch, 18% narrow arch and 13% mid arch. Conclusion: Considerable variation in distribution of dental arch form types found between Nepalese male and female samples and among population groups. The analysis enables the mathematical method that predetermines the dental arch form of the individual orthodontic patient.DOI: http://dx.doi.org/10.3126/ojn.v3i1.9267 Orthodontic Journal of Nepal, Vol.3, No.1, 2013: 7-13

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4

Budiman, JohanA. „Mathematical ratio in defining arch form“. Dental Hypotheses 8, Nr. 3 (2017): 70. http://dx.doi.org/10.4103/denthyp.denthyp_26_17.

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5

Lee, Robert T. „Arch width and form: A review“. American Journal of Orthodontics and Dentofacial Orthopedics 115, Nr. 3 (März 1999): 305–13. http://dx.doi.org/10.1016/s0889-5406(99)70334-3.

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6

Baluta, J., und C. L. B. Lavelle. „An analysis of dental arch form“. European Journal of Orthodontics 9, Nr. 1 (01.01.1987): 165–71. http://dx.doi.org/10.1093/ejo/9.1.165.

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7

Baluta, J., und C. L. B. Lavelle. „An analysis of dental arch form“. European Journal of Orthodontics 9, Nr. 2 (01.05.1987): 165–71. http://dx.doi.org/10.1093/ejo/9.2.165.

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8

Battagel, Joanna M. „Individualized Catenary Curves: Their Relationship to Arch Form and Perimeter“. British Journal of Orthodontics 23, Nr. 1 (Februar 1996): 21–28. http://dx.doi.org/10.1179/bjo.23.1.21.

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Study casts of the lower arches of 35 children in whom arch alignment was considered acceptable, were examined using a reflex microscope. Arch perimeter was calculated mathematically from a method which required measurement of the mesio-distal widths of the teeth only. This was described as the ‘overlap’ method. Arch perimeter was also calculated using individualized catenary curves for each subject. Two calculations were made, recording arch width either at the distal contact points of the first permanent molars or between their mesio-buccal cusps. Arch perimeter measured from the length of the catenary curves was consistently shorter than that calculted by the overlap method. The variation ranged from 0·02 to 4·58 mm. The catenary constructed using the distal molar contacts gave a better representation of the actual arch form: the mean discrepancy was 2·36 mm, compared with 2·86 mm with the second method where arch width was measured between mesio-buccal cusps. Both techniques for calculation of arch perimeter were heghly reproducible. The catenary curve only approximated arch form well when the arch was relatively narrow across the inter canine region. For square arches this method was unsatisfactory. It is suggested that alternative techniques would be more reliable and the overlap method desribed here is considered satisfactory.

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Gugwad, Dr R. S., Dr Savita Akki und Dr Sharanbasappa C. Nagaral. „Correlation Between Tooth form, Face Form and Arch Form Using Computer Program“. IOSR Journal of Dental and Medical Sciences 15, Nr. 07 (Juli 2016): 01–04. http://dx.doi.org/10.9790/0853-150740104.

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10

Tavares, Alana, Emanuel Braga und Telma Martins de Araújo. „Digital models: How can dental arch form be verified chairside?“ Dental Press Journal of Orthodontics 22, Nr. 6 (November 2017): 68–73. http://dx.doi.org/10.1590/2177-6709.22.6.068-073.oar.

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ABSTRACT Introduction: Plaster dental casts are routinely used during clinical practice to access maxillary dental arch form and assist on fabrication of individualized orthodontic archwires. Recently introduced, digital model technology may offer a limitation for the obtainment of a dental physical record. In this context, a tool for dental arch form assessment for chairside use is necessary when employing digital models. In this regard, paper print of the dental arch seems thus to be useful. Methods: In the present study, 37 lower arch models were used. Intercanine and intermolar widths and dental arch length measurements were performed and compared using plaster dental casts, digital models and paper print image of the models. Ortho Insight 3D scanner was employed for model digitalization. Results: No statistically significant differences were noted regarding the measurements performed on the plaster or digital models (p> 0.05). Paper print images, however, showed subestimated values for intercanine and intermolar widths and overestimated values for dental arch length. Despite being statistically significant (p< 0.001), the differences were considered clinically negligible. Conclusion: The present study suggests that paper print images obtained from digital models are clinically accurate and can be used as a tool for dental arch form assessment for fabrication of individualized orthodontic archwires.

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Ahmed, Maheen, Attiya Shaikh und Mubassar Fida. „Evaluation of conformity of preformed orthodontic archwires and dental arch form“. Dental Press Journal of Orthodontics 24, Nr. 1 (Februar 2019): 44–52. http://dx.doi.org/10.1590/2177-6709.24.1.044-052.oar.

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ABSTRACT Introduction: The alterations in the arch form during treatment are dictated by the dimensions of the archwires. Objective: This study aimed to determine the mean arch dimensions of a sample of Pakistani subjects and to evaluate the conformity of preformed archwires with mandibular arch form. Methods: The dental records of 1,500 adult subjects were evaluated. The mandibular casts of 42 subjects (males = females = 21) with balanced facial profile, Class I occlusion, ideal overjet and overbite were included. Brackets were bonded on all teeth. Arch dimensions were evaluated at canines, first premolars, second premolars, first and second molars, with digital vernier calipers. The arch widths at the level of aforementioned teeth were evaluated on the digitized archwires, using the mean arch depths of the subjects. Results: In males, the archwires were found to be wider at canines and premolars, and significantly narrower at first (p< 0.001, 95% CI = 2.03 - 5.74) and second molars (p< 0.001, 95% CI = 2.29 - 7.73) as compared to the arch dimensions of the mandibular casts. In females, the archwires were significantly narrower at canines (p< 0.001, 95% CI = 1.4 - 3.97), and first (p= 0.02, 95% CI = 0.402 - 4.41) and second molars (p< 0.001, 95% CI = 1.76 - 6.13). Conclusion: No single commercially available archwires evaluated in the present study conformed to the arch dimensions of our subjects. Utilization of the currently available archwires may result in unwarranted modification of arch form, which may lead to unstable post-treatment teeth position.

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Murshid, Zuhair. „Integrity of dental arch form: A review“. Egyptian Orthodontic Journal 43, Nr. 6 (01.06.2013): 55–67. http://dx.doi.org/10.21608/eos.2013.78879.

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13

Sekikawa, Mitsuo. „Fourier analysis of the dental arch form.“ Japanese Journal of Oral Biology 28, Nr. 1 (1986): 43–61. http://dx.doi.org/10.2330/joralbiosci1965.28.43.

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Putri, Mega Widya, Rifqi Sabita und Dzikra Nurseptiani. „Relationship between Abnormalities the Arcus Form Static and Dynamic Balance Levels In Class 1-4 Students for Primary School Muhammadiyah Ambokembang Academic 2018/2019 in Pekalongan District“. International Journal of Multicultural and Multireligious Understanding 6, Nr. 4 (30.09.2019): 522. http://dx.doi.org/10.18415/ijmmu.v6i4.1031.

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This study was conducted to determine the relationship between arch deformity with dynamic balance and static balance in students at SD Muhammadiyah Ambokembang. Arch deformity data was obtained from the pedis arch test, namely the wet footprint test, dynamic balance was obtained from the balance beam test and the static succession was obtained from a one foot stand test. This research was conducted on boys and girls at Muhammadiyah Ambokembang class 1-4 Primary School. In this study, there is a relationship between arch deformity with dynamic equilibrium (p <0.05) with value (p = 0,000) and static balance with values (p = 0,000). Many factors can affect a person's dynamic balance, namely physical, biomechanical, musculoskeletal, and somatosensory factors. However, from the results of this study it can be seen that musculoskeletal factors in the form of a pedis arch form in particular the arch form deformity turned out to greatly affect the dynamic balance in the elementary school students studied. Arche deformities can affect dynamic balance because the flat foot shape without curvature is less able to function as a rigid lever for leveraging the body when the foot will leave its footing in the walking process. This study provides the results that respondents experience impaired balance, especially when doing a static balance test that is by walking on long beams.

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Nayar, Sanjna, Aruna, Santhosh und Wasim Manzoor. „Correlation between arch form and facial form: A cross sectional study“. Journal of Pharmacy and Bioallied Sciences 7, Nr. 5 (2015): 87. http://dx.doi.org/10.4103/0975-7406.155816.

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16

Jacobson, Alex. „A longitudinal study of arch size and arch form in African American children“. American Journal of Orthodontics and Dentofacial Orthopedics 119, Nr. 3 (März 2001): 330. http://dx.doi.org/10.1067/mod.2001.111915.

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17

Hughes, Toby, Lindsay Richards und Grant Townsend. „Form, Symmetry and Asymmetry of the Dental Arch: Orthogonal Analysis Revisited“. Dental Anthropology Journal 16, Nr. 1 (03.09.2018): 3–8. http://dx.doi.org/10.26575/daj.v16i1.163.

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There have been numerous attempts to quantify the shape of the dental arch mathematically, with orthogonal polynomial curves providing a robust and versatile method for quantifying variation in both shape and asymmetry. Lu (1966) first presented the theoretical basis for fitting orthogonal polynomials to arch shape data. Whilst theoretically sound, Lu’s original paper contained several arithmetic errors and a number of incorrect assumptions. In this paper we present corrections for these errors and extrapolate the theory to unequally-spaced arch shape data using a simple recursive procedure first developed by Robson (1959).

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Ussamah Waheed Jatala, Anam Fayyaz Bashir und Nazia Yazdanie. „ASSESSMENT OF MEAN DISTANCE BETWEEN CENTRAL INCISOR AND INCISIVE PAPILLA WITH RESPECT TO STANDARDIZED ARCH FORM IN DENTATE SUBJECTS“. Journal of University Medical & Dental College 12, Nr. 1 (22.02.2021): 9–16. http://dx.doi.org/10.37723/jumdc.v12i1.489.

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BACKGROUND & OBJECTIVE: Edentulous patients require accurate positioning of artificial maxillary anterior teeth in complete dentures to recover the esthetic and phonetic characteristics. This positioning is guided by measuring distance between central incisor (CI) and incisive papilla (IP) in dentate subjects which varies according to the ovoid, square and tapered maxillary arch forms. Objectives: 1- To determine the frequency of three different arch forms in dentate patients; 2- To assess the mean distance between central incisor and incisive papilla in each of the three maxillary arch forms. METHODOLOGY: 130 cases were selected by non-probability consecutive sampling, which included both genders and age range of 20-40 years. Impressions of maxillary arches were recorded and their casts photocopied. Arch form template was used to standardize the assessment of arch forms by best-fit method on the photocopies. The distance between mesio-incisal edge of CI and posterior border of IP was measured with digital verniercalipers (SparkFun,Colorado). RESULTS: Out of 130 subjects, 54 males and 76 females were present. The ovoid arch form was the most frequent form recorded at 67% (n=87) while the tapered arch was the least at 14% (n=18). The overall mean distance between central incisor (CI) and incisive papilla (IP) was 11.34mm (7.58mm - 16.45mm). The mean distance was the highest for ovoid arch form (11.58mm) and lowest for square (10.49) with a statistically significant difference (p=0.016) between the two arch forms. CONCLUSION: The ovoid arch was the most frequent arch form found in dentate subjects. The mean distance recorded was highest for ovoid arch followed by tapering arch and least for square arches.

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Jang, Kabsoo, KyungEun Suk, Mohamed Bayome, Yoonji Kim, Seong-Hun Kim und Yoon-Ah Kook. „Comparison of arch form between Koreans and Egyptians“. Korean Journal of Orthodontics 40, Nr. 5 (2010): 334. http://dx.doi.org/10.4041/kjod.2010.40.5.334.

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20

Gandikota, Chandra Shekhar, Nemani Shivaram und Syed Amaan Husain. „A Simplified Method for Fabricating Customized Arch Form“. Journal of Indian Orthodontic Society 53, Nr. 1 (März 2019): 87–89. http://dx.doi.org/10.4103/jios.jios_266_17.

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21

Nodai, Etsuo, Kotaro Yanaru, Sakiko Yoshikawa, Naotoshi Masumoto und Kazunori Yamaguchi. „The Examination of Arch Form in Japanese Adults“. Journal of the Kyushu Dental Society 60, Nr. 2.3 (2006): 51–55. http://dx.doi.org/10.2504/kds.60.51.

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22

Kim, Sung Jae, und Tae Yong Koo. „Arch Form Pathologic Suprapatellar Plica: A Case Report“. Journal of the Korean Orthopaedic Association 33, Nr. 3 (1998): 714. http://dx.doi.org/10.4055/jkoa.1998.33.3.714.

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23

Gandikota, Chandra Shekhar, Nemani Shivaram und Syed Amaan Husain. „A Simplified Method for Fabricating Customized Arch Form“. Journal of Indian Orthodontic Society 53, Nr. 1 (März 2019): 87–89. http://dx.doi.org/10.1177/0974909820190117.

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24

Valiathan, Ashima, und Sumit Gandhi. „Buccal corridor spaces, arch form, and smile esthetics“. American Journal of Orthodontics and Dentofacial Orthopedics 128, Nr. 5 (November 2005): 557. http://dx.doi.org/10.1016/j.ajodo.2005.09.011.

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Lombardo, Luca, Luca Saba, Giuseppe Scuzzo, Kyoto Takemoto, Lola Oteo, Juan Carlos Palma und Giuseppe Siciliani. „A new concept of anatomic lingual arch form“. American Journal of Orthodontics and Dentofacial Orthopedics 138, Nr. 3 (September 2010): 260.e1–260.e13. http://dx.doi.org/10.1016/j.ajodo.2010.04.022.

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26

Shen, Yadong, Jianhu Feng, Xiaohan Cheng, Xuntao Wang und Changhao Zhang. „A Form Finding Method for Arch Bridges Using Parametric Level Set Method“. Advances in Civil Engineering 2018 (11.11.2018): 1–9. http://dx.doi.org/10.1155/2018/2198696.

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Topology optimization has developed rapidly in the past three decades; as a creative and efficient optimization technique, it has been applied in engineering fields of aerospace and mechanical. However, there are a few attempts in bridge form design. In this paper, the parametric level set method is utilized to solve the form finding of arch bridges. The optimization model for minimizing the structural compliance under the volume constraint is built. Three numerical examples of form finding of arch bridges are studied. Results show that the optimal structures which have well-distributed stress and smooth force transmission are almost identical with the actual forms of arch bridges. The optimal forms can be treated as alternatives in the preliminary design stage, and topology optimization has a bright prospect in form finding of arch bridges.

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Abdulhameed, Ali A., und AbdulMuttalib I. Said. „Experimental Investigation of the Behavior of Self-Form Segmental Concrete Masonry Arches“. Fibers 7, Nr. 7 (02.07.2019): 58. http://dx.doi.org/10.3390/fib7070058.

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This research aims to introduce a new technique—off-site and self-form segmental concrete masonry arches fabrication, without the need of construction formwork or centering. The innovative construction method in the current study encompasses two construction materials forms the self-form masonry arches, wedge-shape plain concrete voussoirs, and carbon fiber-reinforced polymer (CFRP) composites. The employment of CFRP fabrics was for two main reasons: bonding the voussoirs and forming the masonry arches. In addition, CFRP proved to be efficient for strengthening the extrados of the arch rings under service loadings. An experimental test was conducted on four sophisticated masonry arch specimens. The research parameters were the Keystone thickness and the strengthening of the self-form arch ring at the intrados. The major test finding was that the use of thicker Keystone alters the behavior of the self-form arch and considerably increases the load carrying capacity by 79%. Partial strengthening of the intrados with CFRP fabrics of typical arch ring Keystone resulted considerable increase in the debonding load of fabrication CFRP sheets by 81%, increase in the localized crushing load by 13% and considerably increase voussoir sliding load by 107%.

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Miyake, Hironao, Tatsuo Ryu und Toshihiko Himuro. „Effects on the Dental Arch Form Using a Preadjusted Appliance with Premolar Extraction in Class I Crowding“. Angle Orthodontist 78, Nr. 6 (01.11.2008): 1043–49. http://dx.doi.org/10.2319/062707-296.1.

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Abstract Objective: To determine the dental arch form effects of treatment with a preadjusted appliance (0.022″ slot) performed concomitantly with extraction of premolars in Class I crowding. Materials and Methods: Twenty-six patients (20.17 ± 12.15 years) with Class I crowding who attained a favorable occlusion after treatment were divided into nonextraction and extraction groups. The three-dimensional coordinates of the FA point of each tooth were determined. The dental arch form was expressed as a quartic polynomial expression with log F value used to represent the dental arch form and calculated using the quadratic and quartic coefficients. Changes in the dental arch form before and after treatment were compared between the groups. Results: In the extraction group, log F value was significantly higher after treatment, and the upper dental arch became more tapered. The U1-APo was significantly lower after treatment. No change was observed in U1-FH. The anterior teeth demonstrated posterior movement due to sliding mechanics, and torque was controlled. The anterior length of the dental arch became significantly longer after treatment for the maxilla and mandible in both groups. Results demonstrated that the upper dental arch might become tapered after treatment used concomitantly with premolar extraction, as a result of the increase in anterior length while maintaining intercanine width for dealing with crowding of the anterior teeth. Conclusion: It is necessary to anticipate that the upper dental arch form will become tapered during extraction treatment for Class I crowding and to select an appropriate arch form.

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Kitai, N., Y. Fujii, S. Murakami, S. Furukawa, S. Kreiborg und K. Takada. „Human Masticatory Muscle Volume and Zygomatico-mandibular Form in Adults with Mandibular Prognathism“. Journal of Dental Research 81, Nr. 11 (November 2002): 752–56. http://dx.doi.org/10.1177/0810752.

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Although several investigators have reported associations between masticatory muscles and skeletal craniofacial form, there is no agreement on the association. We tested the hypothesis that masticatory muscle volume correlates with the size and form of the adjacent local skeletal sites. For this purpose, we investigated the morphological association of the cross-sectional area and volume of temporal and masseter muscles with zygomatico-mandibular skeletal structures using computerized tomography (CT) in 25 male adults with mandibular prognathism. Muscle variables significantly correlated with widths of the bizygomatic arch and temporal fossa but not with the cranium width. Masseter volume significantly correlated with cross-sectional areas of the zygomatic arch and mandibular ramus. Masseter orientation was almost perpendicular to the zygomatic arch and mandibular antegonial region. The zygomatic arch angle significantly correlated with the antegonial angle. The results of the study suggest that the masticatory muscles exert influence on the adjacent local skeletal sites.

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Baral, Prakash, Rami Shrestha, Subash Sapkota, Sapana Koju und Binod Chaudhari. „A Study of Anatomical Shape of arch projected by Alveolar Process of Maxillary and Mandibular Bone“. Journal of Gandaki Medical College-Nepal 13, Nr. 2 (25.12.2020): 164–68. http://dx.doi.org/10.3126/jgmcn.v13i2.30222.

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Introduction: Maxilla and Mandible have an alveolar process that bears socket for root of teeth. When the teeth fall or gets extracted there is resorption of alveolar process. The teeth alignment determines the shape of alveolar process. The objectives of the study was to assess the distribution pattern of anatomical shape of arch projected by alveolar process in Maxilla and Mandible and to compare the anatomy of arch amongst the population of Aryan and Mongoloid communities. Methodology: A total number of 856 people with intact anatomy of alveolar arch were included in the study. Anatomy of alveolar arches were assessed and noted for all. The brass wire was contoured according the shape of alveolar arch of patients and the shape was observed and noted down. Result: The study result showed there was significant difference in frequency distribution of ‘U’, ’V’ and ‘Ovoid’ shape alveolar arch form in maxilla and mandible. There was significant difference in distribution of ‘U’ and ‘V’ shape alveolar arch form in maxilla and ‘U’, ‘V’ and ‘Ovoid’ shape arch form in mandible between mongoloid and Aryan communities. Conclusion: ‘U’shape alveolar arch was seen more frequently in mandible where as “V” shape and ‘Ovoid’ shape arch in maxilla. ‘U’ shape alveolar arch was more frequently seen in Mongoloid communities and ‘V’ shape was more frequently seen in Aryan communities. There was no significant difference in comparison of frequency percentage of various types of arch form between the Male and Female.

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ZHANG, SHENG. „AN ASYMPTOTIC ANALYSIS ON THE FORM OF NAGHDI TYPE ARCH MODEL“. Mathematical Models and Methods in Applied Sciences 18, Nr. 03 (März 2008): 417–42. http://dx.doi.org/10.1142/s0218202508002747.

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We consider a one-dimensional model of generally curved elastic arches whose cross-sections are rectangular. The model is of Naghdi's type which is a generalization of the Timoshenko beam model, which allows bending, membrane and transverse shearing deformations. Its form is basically determined in the literature, except for the value of a shear correction factor. With this factor being set to 1, we prove that the modelling error in the interior relative energy norm is proportional to the arch thickness. This result holds for the full range of arch shapes and very general loads. Lower modelling accuracy is proven to hold up to the arch ends. Any shear correction factor other than 1 makes the model diverge from the elasticity theory when a significant shear is involved in the deformation.

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DMITRIEV, I. K. „REASURCH THE WORK OF THE TRADITIONAL CIRCULAR ARCH OF TIMBER JAMBS WITH AN OPTION OF ITS STRENGTHENING“. Building and reconstruction 90, Nr. 4 (2020): 29–37. http://dx.doi.org/10.33979/2073-7416-2020-90-4-29-37.

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The article discussesthe research of the traditional circular archs of timber jambs, designedin the 16-th century by the French architectPhilibert Delorme, with an option of its strengthening, which make this arch comparable to the glued timber one. The experimental research of a flat arch, made of small wooden bricks strung on a steel rope and prestressed from the foundationzone, was carried out in the NRU MGSU. According to the results, it was found, that the arch has a low carrying capacity and can work only on compression. However, by strengthening the arch by using a steel band along its upper face and thus moving to the truss structure, it is possible to increase significantly its carrying capacity and bring it closer to the glued timber arch. During tests, it was noted that by the character of its work this arch is close to the circular arch of timber jambs. In the LIRA-CAD PC a computer simulationwas carried out of the traditional and the strengthened by a steel band along its upper face circular arches of timber jambs, as well as the glued timber arch. The following results were obtained.During the deformation process, the deflection of the strengthened circular arch decreased by 31%, and the stresses in it decreased by 26% compared to the traditional one, and according to the carrying capacity the arch has become comparable to the glued timber one. On this basis the conclusions were obtained, that it is possible to create non-linear form constructions, inherent to the natural objects, using the strengthened circular arch.

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Cao, Yi Shan. „Research on Development of Arch Tower Cable-Stayed Bridge“. Applied Mechanics and Materials 361-363 (August 2013): 1245–50. http://dx.doi.org/10.4028/www.scientific.net/amm.361-363.1245.

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In recent years, the arch tower cable-stayed bridge were widely used. 19 arch tower cable-stayed bridges built or under construction at home and abroad were investigated and summarized in design technology. Involves mainly include: span arrangement form, ratio between side span and main span, height-span ratio, the form of arch axis, structure form of tower and main girder. Research results can provide reference for the engineering designers.

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Ishikawa, Hiroyuki, Shinji Nakamura, Kouichi Misaki, Motonori Kudoh, Hiroshi Fukuda und Shigemitsu Yoshida. „Scar Tissue Distribution on Palates and its Relation to Maxillary Dental Arch Form“. Cleft Palate-Craniofacial Journal 35, Nr. 4 (Juli 1998): 313–19. http://dx.doi.org/10.1597/1545-1569_1998_035_0313_stdopa_2.3.co_2.

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Objective This study investigated the relationship between maxillary dental arch form and distribution of postsurgical scar tissue on previously denuded bone in isolated cleft palate patients. Method The palatal blood flow of 21 Japanese isolated cleft palate patients (6 males, 15 females) was examined by laser doppler flowmetry to determine the scar tissue areas. All had undergone pushback operations for palatal repair at around 18 months of age. Tissue blood flow was examined at a time ranging from 11 years, 5 months to 19 years, 9 months of age. To evaluate the maxillary dental arch form, dental casts obtained at the start of orthodontic treatment (a mean age of 8 years, 4 months) were analyzed. Results/Conclusions Scar tissue distribution in the 21 cases was classified into five types. Characteristic features in the maxillary dental arch form were found in each of the five types according to the extent of the scar tissue. It was evident that the severity of the maxillary dental arch constriction was closely related to the scar tissue distribution on palates.

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Saeed, Hashim K., und Adil O. Mageet. „Dental Arch Dimensions and Form in a Sudanese Sample“. Journal of Contemporary Dental Practice 19, Nr. 10 (2018): 1235–41. http://dx.doi.org/10.5005/jp-journals-10024-2410.

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36

Budiman, Johan Arief. „Neural Network in Developing Software for Indentifying Arch Form“. International Journal of Artificial Intelligence & Applications 4, Nr. 3 (31.05.2013): 1–11. http://dx.doi.org/10.5121/ijaia.2013.4301.

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37

Luini, Gianluca, Anna Hille, Piero Zecca, Aldo Macchi, Bartlomiej Loster und Alberto Caprioglio. „Innovative virtual set-up to evaluate arch form effects“. Journal of Stomatology (Czasopismo Stomatologiczne) 66, Nr. 5 (01.09.2013): 685–92. http://dx.doi.org/10.5604/00114553.1065053.

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Maniklal Khatri, Jeevan, und Jyoti Bhagwandass Madaan. „Evaluation of Arch Form among Patients Seeking Orthodontic Treatment“. Journal of Indian Orthodontic Society 46 (15.10.2012): 325–28. http://dx.doi.org/10.5005/jp-journals-10021-1114.

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BeGole, Ellen A., Deborah L. Fox und Cyril Sadowsky. „Analysis of change in arch form with premolar expansion“. American Journal of Orthodontics and Dentofacial Orthopedics 113, Nr. 3 (März 1998): 307–15. http://dx.doi.org/10.1016/s0889-5406(98)70302-6.

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40

Kasai, Kazutaka, Shinichi Negishi, Ryosuke Hayashi, Katsuhiko Saitoh und Eisaku Kanazawa. „Growth change of dental arch form in mixed dentition“. Orthodontic Waves 70, Nr. 1 (01.03.2011): 44–45. http://dx.doi.org/10.1016/j.odw.2010.11.006.

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41

Khatri, Jeevan Maniklal, und Jyoti Bhagwandass Madaan. „Evaluation of Arch Form among Patients Seeking Orthodontic Treatment“. Journal of Indian Orthodontic Society 46, Nr. 4_suppl2 (Dezember 2012): 325–28. http://dx.doi.org/10.1177/0974909820120606s.

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42

Kirillov, Yu V. „Optimization of the form of a concrete arch dam“. Hydrotechnical Construction 24, Nr. 5 (Mai 1990): 338–46. http://dx.doi.org/10.1007/bf01434340.

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43

Jorquera-Lucerga, Juan. „Form-Finding of Funicular Geometries in Spatial Arch Bridges through Simplified Force Density Method“. Applied Sciences 8, Nr. 12 (10.12.2018): 2553. http://dx.doi.org/10.3390/app8122553.

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In a “classical” vertical planar arch bridge subjected only to in-plane loads, its funicular geometry (which is the geometry that results in an equilibrium state free from bending stresses, i.e., simply under axial forces) is contained within a vertical plane. In the so-called “spatial arch bridges,” their structural behavior extends from the essentially vertical in-plane behavior of the “classical” arch bridges to a three-dimensional behavior. The paper presents how the Force Density Method, which is a form-finding method originally developed for cable meshes, can be simplified to easily obtain three-dimensional funicular arches. The formulation and flow chart of the method is presented and discussed in detail within this paper. Additionally, some case studies illustrate its scope. This paper intends to be useful at the conceptual stage of bridge design when the three-dimensional geometry for the spatial arch bridge typology is considered either because of functional requirements, structural efficiency, or for aesthetical purposes.

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Bell, D. „A lost aesthetic: traditional architectural form in wood and its neglect“. Architectural Heritage 15, Nr. 1 (November 2004): 1–19. http://dx.doi.org/10.3366/arch.2004.15.1.1.

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45

Saze, Naomi, und Kazuhito Arai. „Variation in form of mandibular, light, round, preformed NiTi archwires“. Angle Orthodontist 86, Nr. 5 (18.03.2016): 796–803. http://dx.doi.org/10.2319/090315-593.1.

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ABSTRACT Objective: To evaluate the variation in form of nickel-titanium (NiTi) archwires by comparing them with the dental arch form of normal Japanese subjects before and after placing them in the first molar tubes. Materials and Methods: The mandibular dental casts of 30 normal subjects were scanned, and the dental arch depths and widths from the canine to the first molar were measured. Standardized images of 34 types of 0.016-inch preformed NiTi archwires were also taken in a 37°C environment, and the widths were measured and then classified by cluster analysis. Images of these archwires placed in a custom jig with brackets attached at the mean locations of the normal mandibular central incisors and first molar were additionally taken. The widths of the pooled and classified archwires were then compared with the normal dental arch widths before and after placement in the jig and among the groups (P < .05). Results: The archwires were classified into three groups: small, medium, and large. The archwire widths in the small and medium groups were narrower than those at all examined tooth widths, except in the case of the premolars of the medium group. After placement in the jig, the pooled archwire widths were found to be significantly narrower and wider at the canine and second premolar, respectively, than at the dental arch, but not in the individual comparisons between groups. Conclusion: The variation observed in the mandibular NiTi archwire forms significantly decreased following fitting into the normal positions of the first molars.

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Kareem, Fadil A., Aras Maruf Rauf, Tara Ali Rasheed und Falah Abdullah Hussain. „Correlation of Three Dimensions of Palate with Maxillary Arch Form and Perimeter as Predictive Measures for Orthodontic and Orthognathic Surgery“. Children 8, Nr. 6 (17.06.2021): 514. http://dx.doi.org/10.3390/children8060514.

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Hard palate is regarded as an important part of the human skull, which contributes to the separation of the oral and nasal cavities. The aims of the study were to investigate the morphology of the hard palate in order to create a general guideline of three-dimensional values of the palate in a Kurdish sample in the city of Sulaimani as well as determining the possible correlations between different palatal parameters in class I malocclusion with the maxillary arch form and perimeter. A retrospective study design was adopted by collecting 100 study models of orthodontic patients aged 16–24 years old attending different private dental clinics in the city of Sulaimani seeking orthodontic management. In this study, three-dimensional palatal measurements including depth, length, and width were measured in an attempt to discover their correlation with each maxillary arch form and perimeter. Additionally, measurements of inter-molar width, inter-canine width, and arch perimeter were carried out. About two-thirds of those seeking orthodontic treatment were females. Nearly 80% of the study sample had narrow palate followed by 15 and 5% of intermediate palate and broad palate, respectively. In regard to arch form, almost 90% of subjects were with tapered maxillary arch form and 10% of them with oval arch form. Males had increased dimensions compared to females, with significant differences, except in palatal depth in the molar area, and palatine height index, in which females showed increased dimensions than males but the differences were statistically non-significant. A strong positive correlation was observed between arch form and canine depth. In regard to arch perimeter, a strong negative correlation was found with molar depth and a medium positive correlation with each of canine depth, palatal width, and palatal length.

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Ren, Zhen. „Finite Element Simulation Analysis of Concrete Hyperbolic Arch Dam“. Applied Mechanics and Materials 488-489 (Januar 2014): 581–84. http://dx.doi.org/10.4028/www.scientific.net/amm.488-489.581.

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Arch dam is a water retaining structure which has beautiful bodily form and reasonable structure form, in recent years, arch dam has been widely used. This paper adopts finite element method to carry out three-dimensional finite element simulation analysis for Haierwa reservoir concrete hyperbolic arch dam, researching variation law of the dams stress and displacement in operating process. Research results show that, Haierwa reservoir concrete hyperbolic arch dam is reasonable structure, good mechanical performance, every index meets the requirements for design.

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Тruba, Ya P., А. А. Dovhaliuk, І. V. Dzyurii, P. А. Danchenko, О. S. Golovenko und V. V. Lazoryshynets. „Correction of the aortic arch hypoplasia in newborn babies, suffering complete form of atrio-ventricular septal defect“. Klinicheskaia khirurgiia 87, Nr. 7-8 (30.09.2020): 29–32. http://dx.doi.org/10.26779/2522-1396.2020.7-8.29.

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Objective. Tactics of treatment and results of the hypoplasia of the aortic arch correction in newborn babies with complete form of atrio-ventricular septal defect were studied. Маterials and methods. During period from 2011 tо 2019 yrs in 21 patients correction of hypoplasia of aortic arch and atrio-ventricular septal defect were performed. The investigated group consisted of patients with a two-ventricular physiology. The patients, suffering imbalanced form of atrio-ventricular septal defect and with variants of hypoplasia in left parts of the heart, were excluded from the investigation. There were 9 (42.9%) boys and 12 (57.1%) girls. Average age of the patients have constituted (2.3 ± 1.1) mo (from 0.06 до 7.7 mo). Average body mass of the patients have constituted (3.8 ± 1.0) kg (from 2.0 до 5.9 kg). The aortic arch segment was considered a hypoplastic one if a Z-score (Standard Score - standard estimation) shift have constituted lesser than 2.0. Results. Hospital lethality have constituted 14.2%. Three newborn babies died: 2 - after first stage of correction, and 1 - after second stage of correction. All the patients, to whom a one-staged correction was done, have survived. The causes of lethality were not connected with method of the aortic arch reconstruction. While performance of echocardiography before discharge from the hospital the pressure gradient on place of the aortic arch plasty have constituted (13.6 ± 6.8) mm Hg at average. Average follow-up period have constituted (2.6 ± 2.1) yrs (from 2 mo tо 8.1 yr). In late follow-up period lethality was absent. In 2 (9.5%) patients in postoperative period reoperations on aortic arch and mitral valve were performed. Tracheal compression as well as the main bronchi compression, neurological complications in late follow-up period were absent. Conclusion. For the patients, suffering complete form of atrio-ventricular septal defect in conjunction with hypoplasia of aortic arch the staged correction constitutes a more favorable option, owing good immediate and late results. A staged approach in the treatment is indicated for newborn babies, suffering hypoplasia of distal aortic arch and competent atrio-venticular valves or with small regurgitation. Оne-stage correction is indicated in hypoplasia of aortic arch, pronounced regurgitation on common atrio-ventricular valve and pronounced heart failure.

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Mishra, Srijana, und S. RB Mathema. „Determining the Position of Tip of Maxillary Canines in Relation to Commissure of Mouth and Midpupillary Line and its Correlation with Square, Ovoid and Tapering Arch Form“. Journal of Nepalese Prosthodontic Society 2, Nr. 1 (23.12.2019): 11–16. http://dx.doi.org/10.3126/jnprossoc.v2i1.26807.

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Introduction: Selection of appropriately sized maxillary denture teeth in various types of arch form is often a challenging aspect during complete denture rehabilitation. The correlation of facial anatomical landmarks may serve as a reliable predictor for the selection of teeth. Materials and methods: The maxillary arch impression of 113 dentate subjects were made, casts poured and divided into square, ovoid and tapering arch form. The position of tip of maxillary canines in relation to commissure of mouth and midpupillary line were determined by using vacuum formed template and pupillometer respectively. Results: The result showed the significant difference in mean distance from commissural to canine tip (p<0.001) and IPD (p<0.017) among square, ovoid and tapering arch form. Conclusion: The commissure of lip may serve as a reliable guideline for selection of anterior teeth according to arch form and IPD/ICW can similarly be used to determine anterior teeth width.

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Sofyanti, Ervina, Trelia Boel, Denny Satria, Zuriyah Fionita Ritonga und Indah Hafniar Hasibuan. „Evaluation of dental arches in orthodontic patients with condylar hyperplasia in a North Sumatra subpopulation: a cross-sectional study“. F1000Research 9 (16.04.2020): 263. http://dx.doi.org/10.12688/f1000research.22780.1.

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Background: Condylar Hyperplasia (CH) is a self-limiting mandibular condyle disorder that shows asymmetry progress conjunction with associated occlusal changes as long as condylar growth is still active and leads to facial asymmetry. This study aimed to evaluate dental arches by analyzing dental arch asymmetry and form in orthodontic patients with CH in a North Sumatra subpopulation. Methods: This is a retrospective study of suspected CH patient’s clinical records who sought for the initial orthodontic treatment between January 2015 to March 2019. Patient with facial asymmetry (based on photography, posterior cross bite and midline deviation), positive temporomandibular joint disorder in functional analysis, and no history of facial trauma were included in the study. Dental arch asymmetry was based on the measurement of dental midline deviation, canine tip in the dental arch, distance of the upper canines from the palatal suture, and inter canine distance. The evaluation of dental arch was achieved by comparing arch width and length. Results: There was a significant difference (p<0.05) of upper canine distance from the palatal suture in female patients when evaluating upper dental arch asymmetry. There was a moderate correlation (r=0.379) in midline deviation between upper and lower dental arch. The dimension and dental arch form was mid and flat, and there was moderate correlation (r=0.448) between the upper and lower dental arch form in these CH patients. Conclusion: The evaluation of dental arch symmetry and arch form showed asymmetric occlusal characteristics in orthodontics patient with CH in North Sumatera subpopulation. In treating these patients, we recommend the plaster cast evaluation as essential and routine procedure in order to understand the complexity of occlusal change due to active growth of condylar and limitation in radiography evaluation.

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