Journal articles: 'Arch width'

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Shahid, Fazal, Mohammad Khursheed Alam, and Mohd Fadhli Khamis. "Maxillary and mandibular anterior crown width/height ratio and its relation to various arch perimeters, arch length, and arch width groups." European Journal of Dentistry 09, no. 04 (October 2015): 490–99. http://dx.doi.org/10.4103/1305-7456.172620.

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ABSTRACT Objective: To investigate the maxillary and mandibular anterior crown width/height ratio and its relation to various arch perimeters, arch length, and arch width (intercanine, interpremolar, and intermolar) groups. Materials and Methods: The calculated sample size was 128 subjects. The crown width/height, arch length, arch perimeter, and arch width of the maxilla and mandible were obtained via digital calliper (Mitutoyo, Japan). A total of 4325 variables were measured. The sex differences in the crown width and height were evaluated. Analysis of variance was applied to evaluate the differences between arch length, arch perimeter, and arch width groups. Results: Males had significantly larger mean values for crown width and height than females (P ≤ 0.05) for maxillary and mandibular arches, both. There were no significant differences observed for the crown width/height ratio in various arch length, arch perimeter, and arch width (intercanine, interpremolar, and intermolar) groups (P ≤ 0.05) in maxilla and mandible, both. Conclusions: Our results indicate sexual disparities in the crown width and height. Crown width and height has no significant relation to various arch length, arch perimeter, and arch width groups of maxilla and mandible. Thus, it may be helpful for orthodontic and prosthodontic case investigations and comprehensive management.

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Gibbs, S. L., and N. P. Hunt. "Functional Appliances and Arch Width." British Journal of Orthodontics 19, no. 2 (May 1992): 117–25. http://dx.doi.org/10.1179/bjo.19.2.117.

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A retrospective study was undertaken using treated functional appliance cases. The groups involved 27 Andresen, 19 Bionator, and 23 Fränkel cases. The reflex metrograph was used to measure arch width from study models at the start of treatment, end of treatment including retention, and at least 1 year post-treatment. The effects of each appliance on arch width are compared during and after treatment.

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Selmani, Mimoza, and Julijana Gjorgova. "Relationship among Lower Arch Length, Arch Width and Arch Perimeter in Crowding and Non-Crowding Groups." Balkan Journal of Dental Medicine 19, no. 1 (March 1, 2015): 8–12. http://dx.doi.org/10.1515/bjdm-2015-0027.

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SUMMARYCrowding is one of the causes of class I malocclusion. The purpose of the present study was to examine the relationship between arch length, arch width and arch perimeter in crowded and non-crowded arches, as well as to made comparison of the right and left sides between them and to find out the contributing factor in lower arch crowding. The study groups consisted of 60 subjects aged 16 to 21 years. First group consisted of 30 pairs of dental study models with class I normal occlusion. The second group consisted of 30 pairs of study models with class I crowding. Measurements of arch length and width were made as defined by Lavelle and Foster, using Korkhaus callipers. Arch perimeter was measured by Lundstrom method’s using manual calliper with sharp points. Differences between these measurements were made by Mann-Whitney U test (Z/U).According to our study, the arch length and arch perimeter were not associated factors in contribution to lower arch crowding. In association of contributed factors on the lower arch crowding, we could mention the width of the arch, because the differences between the two groups was significantly different.

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Kareem, Fadil Abdullah, Aras Maruf Rauf, Arass Jalal Noori, and Trefa M. Ali Mahmood. "Prediction of the Dental Arch Perimeter in a Kurdish Sample in Sulaimani City Based on Other Linear Dental Arch Measurements as a Malocclusion Preventive Measure." Computational and Mathematical Methods in Medicine 2020 (December 21, 2020): 1–6. http://dx.doi.org/10.1155/2020/8869996.

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The current study aimed to find a prediction equation to estimate the arch perimeter (AP) depending on various arch dimensions including intercanine width (ICW), intermolar width (IMW), interpremolar width (IPMW), and arch length (AL) in a sample of the Kurdish population in Sulaimani City. The study sample was 100 pairs of preorthodontic dental casts. Calculations of dental arch dimensions and perimeter were performed by a digital vernier. Statistical analysis was performed via using the SPSS version 25 software. The developed prediction equation for the upper arch was Y = + 1.3 × arch length + 1 × intermolar width , whereas the equation for the lower arch was Y = + 0.9 × intermolar width + 0.92 × intercanine width . Paired t -test revealed no statistical difference between predicted and real arch perimeters. Two separate prediction equations for upper and lower arches were developed based on the arch length (AL) and intermolar width (IMW) for the maxillary arch, intermolar (IMW), and inter canine widths (ICW) for the lower arch. The developed equations could have further beneficial impacts on orthodontic diagnosis and treatment planning.

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Hnat, William P., Stanley Braun, Antony Chinhara, and Harry L. Legan. "The relationship of arch length to alterations in dental arch width." American Journal of Orthodontics and Dentofacial Orthopedics 118, no. 2 (August 2000): 184–88. http://dx.doi.org/10.1067/mod.2000.105570.

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Lee, Robert T. "Arch width and form: A review." American Journal of Orthodontics and Dentofacial Orthopedics 115, no. 3 (March 1999): 305–13. http://dx.doi.org/10.1016/s0889-5406(99)70334-3.

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Hashim, Hayder Abdullah, and Sarah AL-Ghamdi. "Tooth Width and Arch Dimensions in Normal and Malocclusion Samples: An Odontometric Study." Journal of Contemporary Dental Practice 6, no. 2 (2005): 36–51. http://dx.doi.org/10.5005/jcdp-6-2-36.

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Abstract The purpose of this study was to establish tooth width and arch dimensions in normal and malocclusion samples and to compare tooth width and arch dimensions between males and females in normal and malocclusion samples. A total of 120 pairs of orthodontic study casts were included in the study. An electronic digital caliper was used for the measurements. Descriptive statistics and the t-test were used for the statistical analysis of the data. Tooth width and arch dimensions were established in normal and malocclusion in the present study. Significant differences were found in tooth width between normal and malocclusion samples. However, no significant difference was observed in arch dimensions. Furthermore, there was statistical significant difference in tooth width between males and females where the males showed higher mean values. The same was true when arch dimensions were compared. The results of the current investigation are of great value to the anthropologist as well as to the orthodontist in understanding dimensional arch criteria and orthodontic arch wire selection. Furthermore, it helps the prosthodontist in the selection of the correct shape and size of stock impression trays and of suitable molds of artificial teeth for fixed and removable prostheses. Citation Hashim HA, Al-Ghamdi SAF. Tooth Width and Arch Dimensions in Normal and Malocclusion Samples: An Odontometric Study. J Contemp Dent Pract 2005 May;(6)2:036-051.

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Sahin, Hakan, and Paul Stark. "Diagnostic Utility of Chest Radiography in Predicting Long-Standing Systemic Arterial Hypertension." AORTA 05, no. 06 (December 2017): 168–72. http://dx.doi.org/10.12945/j.aorta.2017.17.092.

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Purpose: To investigate the association between aortic arch width on frontal chest radiography and systemic hypertension. Methods: A total of 200 consecutive patients were included. Relationships between aortic arch width measurement on chest radiography and blood pressure measurement were investigated using Student’s t -tests and Fisher’s exact tests. Results: Twenty-five patients were normotensive (< 130/90 mmHg), and 175 were hypertensive. Using cut-off values, 136 patients had an aortic arch width ≥ 3.5 cm, and 65 had an aortic arch width ≥ 4 cm. We found a significant relationship between aortic arch width and hypertension (p < 0.001) as well between aortic arch width cut-off values of 3.5 cm and 4 cm and hypertension (p < 0.001 and p < 0.005, respectively). An aortic arch width ≥ 3.5 cm was associated with a positive likelihood ratio (LR) of 2.3, negative LR of 0.39, sensitivity of 73, specificity of 68, positive predictive value of 94, negative predictive value of 26.6, pretest odds of 7, posttest odds of 16, and posttest probability of 94%. An aortic arch width ≥ 4 cm was associated with a positive LR of 4.50, negative LR of 0.70, sensitivity of 36, specificity of 92, positive predictive value of 97, negative predictive value of 17, pretest odds of 7, posttest odds of 31.5, and posttest probability of 97%. Conclusions: Aortic arch width measurement on chest radiography can be used to predict the presence of long-standing systemic arterial hypertension.

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Huang, Chiung-Shing, Hsin-Chung Cheng, Yu-Ray Chen, and M. Samuel Noordhoff. "Maxillary Dental Arch Affected by Different Sleep Positions in Unilateral Complete Cleft Lip and Palate Infants." Cleft Palate-Craniofacial Journal 31, no. 3 (May 1994): 179–84. http://dx.doi.org/10.1597/1545-1569_1994_031_0179_mdaabd_2.3.co_2.

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The development of the dental arch is well designed for adaptive and compensatory growth. In this study, the relationship between the sleep position and dental arch development was Investigated. A group of 42 infants with unilateral complete cleft lip and palate with either prone (16) or supine (26) sleep position were seen in the craniofacial center. All infants were less than 1 month of age at the initial visit. Dental impressions of the maxillary arch were taken at the initial visit and just before cheiloplasty. Ten arch dimensions were measured in each dental cast and the longitudinal change in each dimension was compared between the prone sleep group and the supine sleep group. Statistically significant changes were detected in the growth rate of the following dimensions: intercanine width, intertuberosity width, alveolar cleft width, anterior cleft width, and posterior cleft width. This study indicated that sleep position affected maxillary arch development. Infants sleeping in the prone sleep position tended to have narrower arch width and cleft width.

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Heidbuchel, Kiki L. W. M., Anne M. Kuijpers-Jagtman, Gem J. C. Kramer, and Birte Prahl-Andersen. "Maxillary Arch Dimensions in Bilateral Cleft Lip and Palate from Birth until Four Years of Age in Boys." Cleft Palate-Craniofacial Journal 35, no. 3 (May 1998): 233–39. http://dx.doi.org/10.1597/1545-1569_1998_035_0233_madibc_2.3.co_2.

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Objective To describe the development of maxillary arch dimensions in children with bilateral cleft lip and palate (BCLP) during the first 4 years of life and to compare it with that in noncleft children. Design This was a retrospective, mixed-longitudinal study. Setting The study was conducted at the Cleft Palate Center of the University Hospital of Nijmegen. Subjects The sample consisted of 26 boys with BCLP who were born between 1976 and 1990 and treated at the University Hospital of Nijmegen. Data for a control group of 34 noncleft boys were collected at the University Hospital of Amsterdam. Method Palatal arch dimensions were digitized on dental casts. A comparison between BCLP and noncleft dimensions was made at fixed time intervals. Results At birth, anterior and posterior arch widths as well as arch depths were significantly larger in children with BCLP. After 7 months (lip closure), anterior arch width and arch depth diminished considerably in the cleft group. After 12 months (palatoplasty), a slight decrease in posterior arch width was observed, and arch depths showed slight catch-up growth. At 4 years of age, anterior arch width was significantly narrower and anterior arch depth was shorter in children with BCLP than in control subjects. Posterior arch width was significantly wider. Conclusions During the first 4 years of life, maxillary arch dimensions in children with BCLP show a unique development that is significantly different from that in noncleft children.

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McWade, Ronald A., Antonios H. Mamandras, and W. Stuart Hunter. "The effects of Fränkel II treatment on arch width and arch perimeter." American Journal of Orthodontics and Dentofacial Orthopedics 92, no. 4 (October 1987): 313–20. http://dx.doi.org/10.1016/0889-5406(87)90332-5.

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Majeed, Omair, Tabassum Ahsan Quadeer, Maria Habib, and Muhammad Faisal Fahim. "Lack of Association of Palataly Impacted Canines with Maxillary Arch Width and Lateral Incisor Anomalies." Journal of the Pakistan Dental Association 29, no. 03 (July 15, 2020): 110–13. http://dx.doi.org/10.25301/jpda.293.110.

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Raucci, Gaetana, Camila Pachêco-Pereira, Vincenzo Grassia, Fabrizia d’Apuzzo, Carlos Flores-Mir, and Letizia Perillo. "Maxillary arch changes with transpalatal arch treatment followed by full fixed appliances." Angle Orthodontist 85, no. 4 (October 6, 2014): 683–89. http://dx.doi.org/10.2319/070114-466.1.

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ABSTRACT Objective: To evaluate short- and long-term maxillary dental arch dimensional changes in patients treated with a transpalatal arch (TPA) during mixed dentition followed by full fixed appliances in the permanent dentition compared with an untreated sample. Materials and Methods: Dental casts and lateral cephalograms obtained from 36 consecutively treated patients before TPA treatment (T0), after TPA treatment (T1), after fixed appliance treatment (T2), and a minimum of 3 years after fixed appliance treatment (T3) were analyzed. The control group was matched as closely as possible. Arch widths, perimeter, and length, as well as crowding and incisor proclination, were evaluated. Results: In the treated group, intercanine, interpremolar, and intermolar widths and arch perimeter increased significantly at T1. At T2, only the intercanine width increase was still significant. At T3 all arch dimensions decreased, remaining larger than they were at T0. The arch length increased after T1, significantly decreased at T2, and slightly decreased at T3. The crowding decreased significantly at T1, was eliminated at T2, and increased at T3. At T3, 50% of the patients showed relapse with crowding ranging from 0.5 to 2 mm. In the control group at T1, only slight changes were noted but crowding increased. At T2, crowding and upper incisor inclination increased but arch length decreased. At T3, intercuspid width, arch perimeter, and arch length continued to decrease, thereby increasing crowding. Conclusion: Maxillary dental arch dimensions changed significantly after TPA followed by treatment with fixed appliances. Relapse occurred to some extent, especially in intercanine width and arch perimeter, but most of the dental arch changes remained stable.

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Li, Weiran, and Jiuxiang Lin. "Dental Arch Width Stability after Quadhelix and Edgewise Treatment in Complete Unilateral Cleft Lip and Palate." Angle Orthodontist 77, no. 6 (November 1, 2007): 1067–72. http://dx.doi.org/10.2319/070506-272.1.

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Abstract Objective: To evaluate the transverse stability of the dental arch in unilateral cleft lip and palate (UCLP) patients after orthodontic treatment with quadhelix and edgewise appliances. Materials and Methods: Twenty repaired complete UCLP patients with posterior crossbites were chosen as the study subjects. All had ceased retention at least 15 months previously. Measurements were carried out directly on the pretreatment, posttreatment, and postretention study models using a three-dimensional dental cast analyzer. The interdental widths were measured for the canines, first premolars, second premolars, first molars, basal bone, and the alveolar arch. Two-way analysis of variance and Fisher's LSD was performed in comparing the difference between intervals. Results: Lower inter-first-premolar width and upper arch widths of each region increased significantly (P < .05) after orthodontic treatment. The expansion was greater in the anterior than the posterior region in the upper arch, and the greatest increase was in the upper first premolar region. The upper arch width decreased after retention, with the decrease of the arch width in the upper canine (1.3 ± 0.8 mm) and first premolar (1.5 ± 0.8 mm) regions being statistically significant. The increased upper arch width in each region and the lower inter-first-premolar width maintained significant expansion after retention. Conclusions: The widths of the dental arch increased significantly after expansion with a quadhelix followed by preadjusted edgewise treatment. Relapse occurred, especially in the upper canine and first premolar region, but most of the treatment effect on the upper arch remained after retention.

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Hamdan, Abdul-Latif, Mohannad Khandakji, and Anthony Tannous Macari. "Maxillary arch dimensions associated with acoustic parameters in prepubertal children." Angle Orthodontist 88, no. 4 (April 18, 2018): 410–15. http://dx.doi.org/10.2319/111617-792.1.

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ABSTRACT Objectives: To evaluate the association between maxillary arch dimensions and fundamental frequency and formants of voice in prepubertal subjects. Materials and Methods: Thirty-five consecutive prepubertal patients seeking orthodontic treatment were recruited (mean age = 11.41 ± 1.46 years; range, 8 to 13.7 years). Participants with a history of respiratory infection, laryngeal manipulation, dysphonia, congenital facial malformations, or history of orthodontic treatment were excluded. Dental measurements included maxillary arch length, perimeter, depth, and width. Voice parameters comprising fundamental frequency (f0_sustained), Habitual pitch (f0_count), Jitter, Shimmer, and different formant frequencies (F1, F2, F3, and F4) were measured using acoustic analysis prior to initiation of any orthodontic treatment. Pearson's correlation coefficients were used to measure the strength of associations between different dental and voice parameters. Multiple linear regressions were computed for the predictions of different dental measurements. Results: Arch width and arch depth had moderate significant negative correlations with f0 (r = −0.52; P = .001 and r = −0.39; P = .022, respectively) and with habitual frequency (r = −0.51; P = .0014 and r = −0.34; P = .04, respectively). Arch depth and arch length were significantly correlated with formant F3 and formant F4, respectively. Predictors of arch depth included frequencies of F3 vowels, with a significant regression equation (P-value < .001; R2 = 0.49). Similarly, fundamental frequency f0 and frequencies of formant F3 vowels were predictors of arch width, with a significant regression equation (P-value < .001; R2 = 0.37). Conclusions: There is a significant association between arch dimensions, particularly arch length and depth, and voice parameters. The formant most predictive of arch depth and width is the third formant, along with fundamental frequency of voice.

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Ling, John Y. K., and Ricky W. K. Wong. "Dental Arch Widths of Southern Chinese." Angle Orthodontist 79, no. 1 (January 1, 2009): 54–63. http://dx.doi.org/10.2319/092007-452.1.

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Abstract Objective: To investigate the dental arch width of the Southern Chinese across buccal cusps, central fossae, or lingual cusps and compare these values with study findings in different populations and using different definitions. Materials and Methods: The dental arch dimensions of study casts of an unselected sample from a 12-year-old Hong Kong Oral Health Survey of 12-year-old children (n = 358; 210 boys and 148 girls) were measured. Results: When compared with Caucasians, the Southern Chinese were characterized by a wider dental arch width. However, variations were great. All maxillary and mandibular male arch widths were significantly larger than female arch widths, except at the incisor regions. Conclusion: This study yielded a database about dental arch widths by which different studies on these widths can be compared.

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Lubis, Hilda Fitria, and Tiopan Beltsazar Sinurat. "Howe’s dental cast analysis of students at the University of Sumatera Utara." Dental Journal (Majalah Kedokteran Gigi) 53, no. 3 (September 15, 2020): 149. http://dx.doi.org/10.20473/j.djmkg.v53.i3.p149-152.

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Background: Cast analysis is the measurement of the upper and lower arch in a 3-dimensional occlusal relationship. Howe’s Analysis can be used to observe total tooth material, arch length, and basal arch width. Howe’s Analysis was conducted to analyse abnormalities of both teeth and the jaw to help diagnose and plan dental care. Purpose: To analyse the difference in total tooth material, arch length, basal arch width, and Howe’s Index between male and female undergraduate students from the University of Sumatera Utara who are of Proto-Malay origin. Methods: Ninety-six samples comprised of 48 male and 48 female students were recruited through the purposive sampling method. All samples were undergraduate students at the University of Sumatera Utara and of Proto-Malay origin, aged between 18 to 26, and have met the exclusion and inclusion criteria. We measured the variables using a digital caliper to measure basal arch width and arch length and Moorrees’ method to measure total tooth material. Data were analysed statistically using an independent t-test to compare means between groups (p<0.05). Results: The male samples’ average value of total tooth material 98.49 mm±3.79, arch length 45.55 mm±2.28, basal arch width 41.07 mm±2.83, and Howe’s Index were 41.71 %±2.63, respectively. The female samples had a lower value compared to the male samples, 94.51 mm, 43.27 mm, 36.89 mm, and 39.05 % respectively. There was a significant difference in the total tooth material, arch length, basal arch width, and Howe’s Index between male and female undergraduate students from the University of Sumatera Utara of Proto-Malay origin (p=0.001; p<0.05). Conclusion: The average measurement of total tooth material, arch length, basal arch width, and Howe’s Index was higher in male than female undergraduate students from the University of Sumatera Utara of Proto-Malay origin.

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Naoumova, Julia, Gabriel Edgardo Alfaro, and Sheldon Peck. "Space conditions, palatal vault height, and tooth size in patients with and without palatally displaced canines: A prospective cohort study." Angle Orthodontist 88, no. 6 (August 13, 2018): 726–32. http://dx.doi.org/10.2319/120717-843.1.

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ABSTRACT Objectives: To assess palatal vault height, tooth size, and dental arch dimensions in patients with unilateral and bilateral palatally displaced canines compared with a control group. Materials and Methods: A sample of 66 patients (mean age: 11.5 ± 1.0 years) with 22 unilateral palatally displaced canines (UPDCs), 22 bilateral palatally displaced canines (BPDCs), and 22 controls (C) were consecutively recruited. All three groups had dental casts that were scanned digitally using the OrthoX three-dimensional model scanner. Tooth size, palatal vault height, dental arch width, dental arch depth, dental arch length, and dental arch space were measured by the same examiner using the GOM software. Remeasurements were made in 10 randomly identified patients. Results: The palatal vault height was significantly lower in the BPDC group compared with controls. A significantly smaller mesial-distal crown width and, in general, more spacing in the maxilla were found in the UPDC and BPDC groups. No differences in arch length or arch width at the molar region were seen between the groups, while the arch length at the canine region was smaller in the UPDC and BPDC groups. However, this was observed in BPDC patients with both deciduous canines present and in most UPDC patients where the deciduous canine was present, compared with the control group, who had more permanent canines present. Conclusions: Patients with PDC had greater reduction in tooth size compared with the control group. The arch length and arch width were similar in patients with and without PDC.

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Hasegawa, Kahei. "Mandibular Arch width Changes during Mandibular Movement." Nihon Hotetsu Shika Gakkai Zasshi 37, no. 2 (1993): 284–95. http://dx.doi.org/10.2186/jjps.37.284.

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Gianelly, Anthony A. "Arch width after extraction and nonextraction treatment." American Journal of Orthodontics and Dentofacial Orthopedics 123, no. 1 (January 2003): 25–28. http://dx.doi.org/10.1067/mod.2003.57.

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Parameshwaran, V. N., and Chandralekha B. "Masseter Activity, Arch Width and Facial Type." Journal of Indian Orthodontic Society 44, no. 1 (March 2010): 91–95. http://dx.doi.org/10.1177/0974909820100115.

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Moin, Kambiz, and Samir E. Bishara. "An Evaluation of Buccal Shield Treatment." Angle Orthodontist 77, no. 1 (January 1, 2007): 57–63. http://dx.doi.org/10.2319/120405-423r.1.

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Abstract Objective: To evaluate the short-term effects of the buccal shield modification of the lip-bumper design and on various mandibular dental arch parameters and to determine whether the changes in arch widths are due to the tipping or bodily movements of the teeth involved. Materials and Methods: This study included 45 consecutively treated patients (29 girls and 16 boys) from a private orthodontic practice. Student's and paired t-tests were used to test the null hypothesis of no change over time for the various measurements. Linear regression analyses were used to determine whether treatment time was a significant predictor of arch width expansion. Significance for all statistical tests was predetermined at P ≤ .05. Results: Student's t-test results indicated the presence of a significant (P < .0001) increase in all the arch parameters measured. The greatest mean expansion was observed at the first (5.0 ± 2.2 mm) and second (3.4 ± 2.2 mm) premolar width measurements. The changes in arch width parameters were significantly (P < .0001) greater than the normal age-related changes in the corresponding parameters. There was no significant difference between arch width expansion of the occlusal vs gingival levels, indicating a bodily and not tipping movement. Only 30% of the lower incisors demonstrated an increase in their proclination beyond normal values. Conclusion: When using the buccal shield appliance, the mandibular arch width parameters can be expanded in the mixed dentition with bodily movement of teeth. The expanded arch width dimensions are greater than what would be expected as a result of normal growth.

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Su, Qing Tian, and Wei Wang. "Studies on Effective Width of Continuous Composite Beam of Arch Bridge." Advanced Materials Research 255-260 (May 2011): 1181–86. http://dx.doi.org/10.4028/www.scientific.net/amr.255-260.1181.

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Steel and concrete composite girder began to be used in arch bridge. For the existing of shear lag, the concrete deck in same cross section did not bear identical stress completely. No stipulations for effective width of concrete deck of composite beam in arch bridge are given in current design specifications and codes, which causes difficulties in analyzing the mechanical behavior of composite arch bridge by beam-column method. In this paper, the mechanics calculation for a multi-span arch bridge with continuous composite beam is conducted. Stresses distribution pattern of concrete deck in transverse direction and the variation of effective width of concrete in longitudinal direction are studied. The degree of impact of effective width caused by varying loads on structure and by varying some details on structure is discussed.

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Sabarinath, VP, Pallavi Thombare, PV Hazarey, Vasant Radhakrishnan, and Sushil Agrekar. "Changes in Maxillary Alveolar Morphology with Nasoalveolar Molding." Journal of Clinical Pediatric Dentistry 35, no. 2 (December 1, 2010): 207–12. http://dx.doi.org/10.17796/jcpd.35.2.f80u21362566qr34.

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Aim: To evaluate the changes in maxillary alveolar morphology in unilateral cleft lip palate infants treated with nasoalveolar molding(NAM). Setting and Design: Study was carried out in the orthodontic department associated with a operating cleft unit in a rural region of central India. Ten UCLP (unilateral cleft lip palate) infants less than 6 weeks of age were treated with NAM prior to surgical repair. Materials and Methods:Pre NAM and Post NAM study models of the UCLP infants were analyzed. Critical linear dimensions including inter- canine width, inter-tuberosity width, arch length and midline deviation were recorded at the different stages using a digital vernier caliper and compared. Statistical analysis were performed using SPSS 13.00 statistical software. Results: Results from this study showed that the width of the alveolar cleft showed a significant decrease with NAM. The arch length and width of the arch in the anterior region also showed a reduction with NAM. The intertuberosity width showed a statistically significant increase during treatment. The arch perimeter showed a significant increase with NAM. Conclusion: NAM was effective in reducing the severity of the initial cleft deformity mainly at the anterior portion of the maxillary arch.

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Shu, Rui, Xianglong Han, Yating Wang, Hui Xu, Dongqing Ai, Lufei Wang, Yeke Wu, and Ding Bai. "Comparison of arch width, alveolar width and buccolingual inclination of teeth between Class II division 1 malocclusion and Class I occlusion." Angle Orthodontist 83, no. 2 (September 4, 2012): 246–52. http://dx.doi.org/10.2319/052412-427.2.

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ABSTRACT Objective: To compare the arch width, alveolar width, and buccolingual inclination of maxillary and mandibular posterior teeth between Class II division 1 malocclusion and Class I occlusion. Materials and Methods: Forty-five subjects with Class I occlusion and 45 subjects with Class II division 1 malocclusion were selected to measure the maxillary and mandibular arch width and alveolar width of premolars and first molars with digital caliper. Buccolingual inclination of maxillary and mandibular premolars and first molars were measured with a modified universal bevel protractor. Results: All of the posterior teeth in both groups were lingually tilted. The maxillary premolars and first molars were significantly more lingually tilted (P < .05) in Class II division 1 malocclusion than in Class I occlusion. Mandibular first premolars were significantly less lingually tilted in Class II division 1 malocclusion than in Class I occlusion. No significant difference of buccolingual inclination was found in mandibular second premolars and first molars between the two groups. No significant difference in maxillary and mandibular arch width and alveolar width was found between the two groups. Conclusions: Buccolingual inclination rather than arch width and alveolar width plays an important role in transverse discrepancy of Class II division 1 malocclusion.

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Othman, Rawand J., and Hiwa S. Khidir. "Differences in Dental Arch Dimensions in a Sample of Kurdish Population among Different Occlusal Categories." Polytechnic Journal 10, no. 1 (June 30, 2020): 51–55. http://dx.doi.org/10.25156/ptj.v10n1y2020.pp51-55.

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It is essential to know dental arch dimensions to provide accurate diagnosis and treatment planning to ensure the satisfactory outcome of orthodontic treatment. The aim of the present study was to measure and compare dental arch dimensions of a Kurdish sample in Erbil city with normal and different classes of malocclusion. Arch width and length were measured by an electronic digital caliper on a total of 150 orthodontic models of school students aged 16–20 years of different occlusal relationships (Class I normal occlusion, Class I, Class II division I, Class II Division II, and Class III malocclusions). The results showed that (1) girls have smaller arch parameters than boys; (2) Class II division II malocclusion showed a significantly smaller upper inter canine width, arch length, incisor molar distance, and incisor canine distance when compared to all other groups; (3) the upper inter premolar and inter molar width were significantly narrower in Class II division I malocclusion than of normal occlusions and Class III malocclusion and also narrower in Class I malocclusion than in normal occlusions for both arches; (4) the arch length was significantly longer in Class II division I when compared to Class II division II, Class I malocclusions (P < 0.01), Class III malocclusion and Class I normal occlusion (P < 0.05), and (5) no statistically significant differences were found in all the arch dimensions for Class III malocclusion when compared with the normal occlusion. In conclusion, girls had smaller arch dimension than boys and Class II Division II malocclusion showed smaller arch in all dimensions while Class II division I malocclusion revealed narrower arch width and longer arch length.

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Zhang, Yang, Ai Qing Wu, and Zhi Hong Dong. "Simulation of Kinematic Movement for Invert Arch Floor of Plunge Pool with Numerical Manifold Method." Advanced Materials Research 295-297 (July 2011): 2511–14. http://dx.doi.org/10.4028/www.scientific.net/amr.295-297.2511.

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The invert arch floor of large plunge pool is composed of some discrete arch blocks divided by construction joints. The joint is only 1 mm wide. Under the uplift pressure, the mechanical behavior belongs to highly nonlinear problem, which is difficult to simulate by finite element method. Based on NMM (numerical manifold method), the kinematic motion process of the invert arch floor is simulated under the different uplift pressure. Calculation results show that: as the uplift pressure increasing, each arch block gradually rises, rotates, contacts with adjacent blocks and the expansion joint width between adjacent blocks reduces. When uplift pressure reaches 85Kpa, the mutation of expansion joint width emerges and the invert arch floor finishes self-lock process which indicating the invert arch floor start playing statically indeterminate role to keep stable. The bearing capacity of the floor is determined by concrete compressive strength and anchoring strength of two arch abutments.

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Shukla, Priti, Danish UZ Zama Khan, Amit Nagar, Shruti Singh, Nishi Grover, and Juhi Yadav. "The verisimilitude of damon brackets versus damon archwires– The real hero." IP Indian Journal of Orthodontics and Dentofacial Research 7, no. 2 (July 15, 2021): 160–66. http://dx.doi.org/10.18231/j.ijodr.2021.027.

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: The Damon passive self-ligating system introduced broad archwires and a passive clip with posterior expansion and with minimal tipping of the teeth. To evaluate and compare the effectiveness of Damon brackets and Damon arch wires in maxillary arch dimensional changes with that of conventional brackets and conventional archwires. A total of 20 patients were selected for the study and randomly divided into 4 Groups with 5 patients in each group. Records (Study models) were taken before starting the treatment (T0) and at the end of leveling and alignment (T1) for all the 20 subjects. Pre-treatment (T0) and at the end of leveling and alignment (T1) study models were assessed for inter canine width, inter first premolar width and inter first molar width. There was statistically significant increase in maxillary arch width in Damon system and conventional bracket with Damon archwires when compared to conventional bracket system and Damon brackets with conventional archwires. The use of conventional or self-ligating brackets does not seem to be an important predictor of change in maxillary arch width in non-extraction patients. The amount of increase in arch width was due to Damon archwires and not because of Damon brackets.

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Shahid, Fazal, Mohammad Khursheed Alam, Mohd Fadhli Khamis, Saeka Matsuda, Masahito Shoumura, and Naoto Osuga. "Crown Dimension in relation to Arch Perimeter, Arch Length and Arch Width in Ideal Occlusion: A Digital Model Study." Journal of Hard Tissue Biology 24, no. 3 (2015): 289–98. http://dx.doi.org/10.2485/jhtb.24.289.

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Laine, T., and L. Alvesalo. "Size of the Alveolar Arch of the Mandible in Relation to that of the Maxilla in 45,X Females." Journal of Dental Research 65, no. 12 (December 1986): 1432–34. http://dx.doi.org/10.1177/00220345860650121101.

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Length and width of the alveolar arch of the mandible and maxilla were determined from hard stone casts of 45,X females (Turner syndrome), female first-degree relatives, and population control females. Adjusted mean values (covariance adjusted for age, previous orthodontic treatment, and number of lost permanent teeth) for mandibular arch width were larger in 45,Xfemales than in normal controls, both absolutely and, more clearly, in relation to the maxillary arch. The total absolute length of the mandibular arch was slightly reduced in 45,X females. The broader and shorter alveolar arch of the mandible in relation to the narrower but normal-length maxillary arch reflects imbalanced facial growth in subjects with one X-chromosome instead of the normal two.

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Barbosa, Flávia Rabelo, Massaru Yokoyama, Pedro Antônio Arraes Pereira, and Francisco José Pfeilsticker Zimmermann. "Effect of arcelin protein on the biology of Zabrotes subfasciatus (Boheman 1833), in dry beans." Pesquisa Agropecuária Brasileira 34, no. 10 (October 1999): 1805–10. http://dx.doi.org/10.1590/s0100-204x1999001000006.

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Arcelin is a seed protein found in wild beans (Phaseolus vulgaris) which gives resistance to Mexican bean weevil, Zabrotes subfasciatus (Boheman 1833) (Coleoptera: Bruchidae). Studies were carried out with the objective of estimating the effect of four alleles of protein arcelin (Arc1, Arc2, Arc3 and Arc4) on the biology of Z. subfasciatus. The experiment was carried out in laboratory at Embrapa-Centro Nacional de Pesquisa de Arroz e Feijão, in Santo Antônio de Goiás, GO, Brazil, under non controlled conditions. The highest levels of antibiosis to Z. subfasciatus were observed in Arc1, with reduction in the number of eggs, number of emerged adults, adults longevity. In the line Arc2 only reduction in the number of emerged adults was observed. The lines Arc3 and Arc4 showed low efficiency on the reduction of progeny of Z. subfasciatus and effects in the longevity and egg-adult cycle were not detected. Insect sexual ratio was not altered by the presence of Arc1, Arc2, Arc3 and Arc4 in the seeds.

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Battagel, Joanna M. "Individualized Catenary Curves: Their Relationship to Arch Form and Perimeter." British Journal of Orthodontics 23, no. 1 (February 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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Hemanth, M., Baswaraj LNU, Jayasudha LNU, Chandrashekhargouda Patil, P. Sunilkumar, HP Raghuveer, and B. Chandralekha. "An Experimental Study of Arch Perimeter and Arch Width Increase with Mandibular Expansion: A Finite Element Method." Journal of Contemporary Dental Practice 14, no. 1 (2013): 104–10. http://dx.doi.org/10.5005/jp-journals-10024-1280.

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ABSTRACT Aims The objective of this study was to estimate the increase in arch perimeter associated with mandibular lateral expansion, To estimate the increase in intermolar width with mandibular lateral expansion and to find out the changes of tooth inclination with mandibular expansion. Materials and methods The mandibular bone with dentition of indian skeletal specimen was obtained. The computer tomogram (CT) slices of the mandible were taken. Finite element model (FEM): Numerical representation of the geometry was created by dividing the geometry into finite number of elements and the elements were connected together with nodes at the junction. Results The result of the study showed when 10° of lateral expansion was applied to the lower buccal segment at the center of rotation found at 4.3 mm below the root apex of first molar, a space of 1.3 mm between the canine and first premolar, and thus an increase in arch perimeter of 2.6 mm. Conclusion The tip of the mesiolingual cusp of the first molar moved 4.2 mm laterally, resulting in a change in intermolar width by 8.4 mm. Three-dimensional simulation showed that 1 mm of intermolar expansion increased the arch perimeter by 0.30 mm. Clinical significance As the finite element method evolves and scientists are able to more clearly define physical properties of biological tissues, more accurate information can be generated at the level that other analytical methods cannot fully provide data. This result would be of value clinically for prediction of the effects of mandibular expansion. How to cite this article Baswaraj, Hemanth M, Jayasudha, Patil C, Sunilkumar P, Raghuveer HP, Chandralekha B. An Experimental Study of Arch Perimeter and Arch Width Increase with Mandibular Expansion: A Finite Element Method. J Contemp Dent Pract 2013;14(1):104-110.

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Zúñiga, Manuel, Marie Champomier-Verges, Monique Zagorec, and Gaspar Pérez-Martínez. "Structural and Functional Analysis of the Gene Cluster Encoding the Enzymes of the Arginine Deiminase Pathway ofLactobacillus sake." Journal of Bacteriology 180, no. 16 (August 15, 1998): 4154–59. http://dx.doi.org/10.1128/jb.180.16.4154-4159.1998.

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ABSTRACT Lactobacillus sake can use arginine via the arginine deiminase (ADI) pathway. We designed degenerate primers based on an alignment of known sequences of ornithine transcarbamoylase (OTC)-encoding genes in order to amplify the L. sakecounterpart sequences by PCR. Screening a genomic library of L. sake in λEMBL3 allowed us to isolate a clone containing a 10-kbL. sake genomic DNA insert. Sequence analysis revealed that the genes involved in arginine catabolism were clustered and encoded ADI (arcA), OTC (arcB), carbamate kinase (arcC), and a putative carrier with high similarity to the arginine/ornithine antiporter of Pseudomonas aeruginosa(arcD). Additionally, a putative transaminase-encoding gene (arcT) was located in this region. The genes followed the order arcA arcB arcC arcT arcD, which differs from that found in other microorganisms. arcA, arcB,arcC, and arcD mutants were constructed, and the ADI pathway was impaired in all of them. Transcriptional studies indicated that arcA gene is subject to catabolite repression, and under the conditions used, several transcripts could be detected, suggesting the existence of different initiation sites or processing of a larger mRNA.

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Claro, Cristiane Aparecida de Assis, Jorge Abrão, Silvia Augusta Braga Reis, and Solange Mongelli de Fantini. "Correlation between transverse expansion and increase in the upper arch perimeter after rapid maxillary expansion." Brazilian Oral Research 20, no. 1 (March 2006): 76–81. http://dx.doi.org/10.1590/s1806-83242006000100014.

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The purpose of the present study was to assess the correlation between transverse expansion and the increase in upper arch perimeter, after maxillary expansion. Dental casts of eighteen patients were obtained before treatment and again five months after maxillary expansion. Measurements of intermolar width, intercanine width, arch length and arch perimeter were made with a digital caliper on photocopies taken from the dental casts. After assessment of the method error, a multiple regression model was developed following the identification of the best subset of variables. The resulting equation led to the conclusion that the increase in arch perimeter is approximately given by the addition of 0.54 times the intercanine expansion, and 0.87 times the arch length alteration.

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Al-Gunaid, Talat, Toshikazu Asahito, Masaki Yamaki, Kooji Hanada, Ritsuo Takagi, Kazuhiro Ono, and Isao Saito. "Relapse Tendency in Maxillary Arch Width in Unilateral Cleft Lip and Palate Patients with Different Maxillary Arch Forms." Cleft Palate-Craniofacial Journal 45, no. 3 (May 2008): 278–83. http://dx.doi.org/10.1597/07-053.

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Objective: The aim of this study was to investigate the relapse tendency in the maxillary dental arch widths in unilateral cleft lip and palate patients with different types of maxillary arch form. Subjects: Thirty-two unilateral cleft lip and palate patients treated by one-stage surgical palatal closure were included. The subjects were divided into three groups according to the types of the maxillary arch forms: group A, symmetrical arch form; group B, collapse of minor segment; group C, collapse of both segments. Methods: Using dental casts obtained at three different times, relapse in the intercanine, interpremolar, and intermolar widths in each group was assessed and differences between groups were investigated. Results: Patients in group A showed stable results in all measurements. Patients in group B showed posttreatment relapse in the intercanine width only, whereas patients in group C demonstrated significant posttreatment relapses in the interpremolar and intermolar widths. Comparison between groups showed more significant relapse in the interpremolar and intermolar widths of group C than in those of group B. Conclusion: The types of the maxillary arch forms in unilateral cleft lip and palate patients might play a stronger role in the stability of the maxillary dental arch widths after orthodontic treatment in patients with collapse of both segments and a severe degree of maxillary narrowness.

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Alkadhi, Omar Hamad, Sarah Fahad Almahfouz, Hana Abdulmajeed Tokhtah, and Lamia Abdulaziz Binhuwaishel. "Dental Arch Dimensions in Saudi Adults." International Journal of Dentistry 2018 (2018): 1–10. http://dx.doi.org/10.1155/2018/2190250.

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Objective. The aim of this study was to investigate the arch dimensions (width, length, and depth) in Saudi Arabia.Materials and Methods. 169 orthodontic models (73 males and 96 females) made of white stone were selected according to inclusion criteria. Measurement of arch dimensions was taken including width, length, and depth at different reference points. Differences between males and females were tested using independent samplest-test.Results. The sample comprised subjects aged 18–33 years old. Most measurements showed higher values for males compared to females. Saudi males showed smaller intercanine widths compared to Caucasians and Southern Chinese but larger widths in females compared to Caucasians and smaller widths compared to Southern Chinese. Saudi males and females showed larger intermolar widths compared to Caucasians but smaller intermolar widths compared to Southern Chinese. For arch length, Saudis showed longer arches compared to Yemenis for both males and females but smaller palatal depths compared to Yemenis.Conclusions. Differences in intercanine width, intermolar width, and palatal length and depth were found between Saudis and other nationalities. Male and female participants had differences in most of the measurements.

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Xu, Liang, and Ya Ping Wu. "Nonlinear Stability Analysis of Qijiadu Long-Span Deck-Type CFST Arch Bridge." Advanced Materials Research 163-167 (December 2010): 1685–91. http://dx.doi.org/10.4028/www.scientific.net/amr.163-167.1685.

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With the application of the composition material-concrete-filled-steel-tube (CFST) in civil engineering, the crossing ability of arch bridge gets advanced development. Therefore, it is of interesting to study the stability of such long-span arch bridges, especially which have small width, for the bridge’s safety under long term operation. The present study focuses on studies the transverse stability of long-span arch bridges with small width. To this purpose, a deck type CFST arch-bridge in Gansu Province is adopted as an example. The arch bridge has a span of 180 m, and its width-span ratio is 1/25.7. The finite element method with a special beam element is employed to analyze the stability. The analyses are carried out for the transverse stability of the bridge during construction and under service, respectively. Furthermore, the influence of the spandrel structure and deck elastic restraints to the stability is investigated taking account of geometrical and material nonlinearity.

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Latief, B. S., C. Lekkas, and A. M. Kuijpers Jagtmant. "Transversal arch width in unoperated adult BCLA patients." International Journal of Oral and Maxillofacial Surgery 36, no. 11 (November 2007): 1000. http://dx.doi.org/10.1016/j.ijom.2007.08.143.

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Jacobson, Alex. "Masseter muscle thickness and maxillary dental arch width." American Journal of Orthodontics and Dentofacial Orthopedics 124, no. 5 (November 2003): 603. http://dx.doi.org/10.1016/j.ajodo.2003.08.015.

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Kiliaridis, S. "Masseter muscle thickness and maxillary dental arch width." European Journal of Orthodontics 25, no. 3 (June 1, 2003): 259–63. http://dx.doi.org/10.1093/ejo/25.3.259.

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Paulino, V., V. Paredes, J. L. Gandia, and R. Cibrian. "Prediction of arch length based on intercanine width." European Journal of Orthodontics 30, no. 3 (February 8, 2008): 295–98. http://dx.doi.org/10.1093/ejo/cjm115.

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Rahman, MM, and MZ Hossain. "Estimation of Arch Width in first Permanent Molar Tooth in the Normal Occlusion in Bangladeshi Population." Bangladesh Journal of Orthodontics and Dentofacial Orthopedics 1, no. 2 (July 31, 2013): 5–8. http://dx.doi.org/10.3329/bjodfo.v1i2.15983.

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Objective: To estimate the arch width in first permanent molar tooth in the normal occlusion of Bangladeshi population. Method: This cross sectional study was conducted among the students of Dhaka Dental College & Hospital, Mirpur- 14, Dhaka-1206. Total number of subjects were hundred, among them fifty were male and fifty were female .Mean age was 23.3 years. The study was conducted from October-2004 to September -2007. Results: The inter molar arch width in male upper jaws were 36.15mm, 43.45mm, 53.82mm respectively and in lower jaw these were 27.2mm, 36.01mm and 46.55mm. The transverse values in female upper jaw were 34.01mm, 41.26mm 51.43mm respectively and in lower jaw these were 26.12mm, 33.84mm and 44.31mm. Conclusion: The idea of a single arch width could not be substantiated in the study. But the result of the study might help clinicians to define normal arch width and their variations more precisely. However, there are scopes left for the researchers to work further over the issue. DOI: http://dx.doi.org/10.3329/bjodfo.v1i2.15983 Ban J Orthod & Dentofac Orthop, April 2011; Vol-1, No.2, 5-8

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Celebi, Ahmet Arif, Enes Tan, and Ibrahim Erhan Gelgor. "Determination and Application of Pont's Index in Turkish Population." Scientific World Journal 2012 (2012): 1–5. http://dx.doi.org/10.1100/2012/494623.

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Disharmony between tooth size and dental arch size induces orthodontic problems. So, dental indices were identified by various authors. One of these is Pont who determined a method of prediction of the ideal dental arch width which has become known as Pont's Index. The purpose of this study was to assess the applicability of Pont's Index to a Turkish population and to compare the results with those obtained from studies of different ethnic subjects. The sample comprised 64 male subjects and 78 female subjects with age range from 14 to 15 years. Measurements were obtained directly from plaster casts; they included mesiodistal crown diameters of the four maxillary incisors, as well as interpremolar and intermolar maxillary arch widths as specified by Pont. Correlation coefficients determined between the measured arch width values and those calculated according to Pont's Index were low in all cases, withrvalues ranging from 0.02 to 0.36. It was concluded that Pont's Index should not be used to predetermine ideal arch width values in Turkish individuals.

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Li, Ding Shi, Qing Tian Su, and Yuan Wei Liu. "Mechanical Behavior of Steel Arch Bridge with Outward Inclined Ribs." Applied Mechanics and Materials 275-277 (January 2013): 1127–31. http://dx.doi.org/10.4028/www.scientific.net/amm.275-277.1127.

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Steel tied arch bridge with outward rib was adopted in Aixihu bridge in Nanchang city, in which steel girder width was 73 m. Outstanding features, such as large ratio of width to length, outward inclined ribs, four groups arrangement of spatial suspender existed in this bridge. Beam-column finite element model (FEM) and shell-beam FEM for the arch bridge are established respectively. The mechanical behaviors of the arch ribs and the girder analyzed by two different models are compared. The calculation results show that both beam-column FEM and shell-beam FEM can be used in the analyzing the mechanical behavior of arch ribs, while for the wide girder mechanical character analysis should not depend on beam-column FEM but shell-beam FEM.

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Aggarwal, Isha, Sumit Chhatwalia, Sanjay Mittal, Mandeep Bhullar, and Divya Singla. "Evaluation in Arch Width Variations among Different Skeletal Patterns in District Solan Population." Dental Journal of Advance Studies 6, no. 02/03 (December 2018): 112–17. http://dx.doi.org/10.1055/s-0039-1677890.

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Abstract Introduction The facial growth pattern differs from individual to individual, and the variations in it are quite high. The assessment of relationship of dental arch dimensions with the facial growth pattern is essential for proper diagnosis and treatment planning. Aim The purpose of this study was to evaluate and compare the dental and alveolar arch widths in patients with varying facial growth patterns in Distt. Solan population. Materials and Methods Pretreatment lateral cephalograms and dental study models of 45 patients with age group between 16 and 30 years were included in the study. Patients were divided into three groups: group I (normodivergent), group II (hypodivergent), and group III (hyperdivergent) on the basis of y-axis, Jarabak ratio, and SN-MP (Sella-Nasion–mandibular plane) angle. Interpremolar and intermolar dental and alveolar arch widths were measured and compared for all the three groups. Results The results showed that the dental and alveolar arch widths were increased in hypodivergent patients and decreased in hyperdivergent patients, which was not statistically significant. Conclusion It was concluded that the dental and alveolar arch dimensions increased as the facial pattern became horizontal.

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Kareem, Fadil A., Aras Maruf Rauf, Tara Ali Rasheed, and 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, no. 6 (June 17, 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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Xiang, Guang-Heng, Chong Wang, Chao Lou, Ming-Qiao Fang, Nai-Feng Tian, and Hua-Zi Xu. "Computed tomography morphometric analysis for C-1 posterior arch crossing screw placement in the pediatric cervical spine." Journal of Neurosurgery: Pediatrics 15, no. 5 (May 2015): 475–79. http://dx.doi.org/10.3171/2014.11.peds14191.

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OBJECT The goal of this study was to evaluate the feasibility of the C-1 posterior arch crossing screw fixation technique in the pediatric age group. METHODS One hundred twenty-three pediatric patients were divided into 6 age groups. Computed tomography morphometric analysis of the C-1 posterior arch was performed. Measurements included height, width, and length. Statistical analysis was performed using the Student t-test and linear regression analysis. RESULTS The mean measurement of the posterior arch was height (6.35 ± 1.80 mm), width (Width 1: 4.48 ± 1.25 mm; Width 2: 4.42 ± 0.68 mm; Width 3: 4.42 ± 0.50 mm), and length (14.48 ± 1.67 mm). Seven (6.93%) of the 101 children in Groups 1–4 and 13 (59.1%) of the 22 children in Groups 5 and 6 could safely accommodate placement of C-1 posterior arch crossing screws. CONCLUSIONS This investigation found that a C-1 posterior arch crossing screw was feasible in this group of Chinese pediatric patients, particularly in those 13 years and older. Preoperative thin-cut CT is essential for identifying children in whom this technique is applicable and for planning screw placement.

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Zhang, Shuang Yang, Qian Hui Pu, Ren Da Zhao, and Zhou Shi. "Load Test Design and Stability Analysis of Basket Handle Arch Bridge with Reinforced Concrete." Advanced Materials Research 838-841 (November 2013): 1009–13. http://dx.doi.org/10.4028/www.scientific.net/amr.838-841.1009.

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Basket handle arch bridge with reinforced concrete shortens the distance between the arch rib compared with parallel arch rib bridge, improves the lateral stability, predecessors have done a lot of research on basket handle narrow arch bridge, but the study of wide span arch bridge is insufficient, conduct load test on a wide basket handle arch bridge which 33m wide and mainspan is 90m, the test results show that the large width-span ratio arch bridge has higher bearing capacity, but vertical bearing capacity is not improved, the dynamic coefficient increases when the speed is higher than 30km/h, the measured dynamic coefficient at jumpy driving is relatively large, the dynamic coefficient is significant when jumpy driving speed is 10~15km/h.

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Yan, Yinqiu, and Zeyun Tian. "Maxillary arch width and buccal corridor changes with orthodontic treatment." American Journal of Orthodontics and Dentofacial Orthopedics 146, no. 2 (August 2014): 135–36. http://dx.doi.org/10.1016/j.ajodo.2014.05.012.

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Journal articles on the topic 'Arch width'

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