The catenometer: A reliable device for estimating dental arch perimeter

Musich, David R.; Ackerman, Jamés S.

doi:10.1016/0002-9416(73)90142-5

Cited by 46 publications

(17 citation statements)

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“…However, dental arch form and shape varies in individuals based on anatomic dimensions of the craniofacial skeleton. 1,2 Qualitative description of the dental arch use terms like elliptic, parabolic or U-shaped; whereas mathematical methods include several curve-fitting algorithms like parabola, semi ellipse, catenary's curve, conic section, cubic plane curve and second to eighth order polynomials.…”

Section: Introductionmentioning

confidence: 99%

Establishment of Yemeni Dental Arch Form

Al-Zubair

2013

Orthod J Nepal

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22 IntroductIonThe search for the elusive "ideal" arch form to suit every individual has been the focus of several reports. However, dental arch form and shape varies in individuals based on anatomic dimensions of the craniofacial skeleton. 1,2 Qualitative description of the dental arch use terms like elliptic, parabolic or U-shaped; whereas mathematical methods include several curve-fitting algorithms like parabola, semi ellipse, catenary's curve, conic section, cubic plane curve and second to eighth order polynomials.3,4 Despite the huge efforts and research works done to determine the ideal arch form, there is little agreement among investigators about the natural shape of the dental arches. 5-7Hawley; 8 based on the earlier work of Bonwill 9 described the ideal arch as being constructed upon an equilateral triangle with slight modifications. The six anterior teeth were thought to be arranged on the arc of a circle whose radius was determined by the combined width of incisors and canines, with the premolars and first permanent molars arranged in a straight line and the second and third molars turning towards the midline. Catenary arch design depends on inter-molar distance measured at central fossae, it could be described as a central core around which the teeth arrange themselves. 10Brader 3 proposed that the dental arch is best considered as a closed curve with the properties of a trifocal ellipse with the teeth occupying only the narrower end of the total curve.Raberin et al 11 examined 278 dental casts of untreated French adults with normal occlusion. Six measurements of mandibular dental arch were performed, and five independent ratios were determined. They developed an arch form guide and defined five mandibular dental arch forms (narrow, wide, mid, pointed and flat).Thus it is worthwhile to mention that determination of the dental arch form relies in the majority of the research works upon dental arch width and length dimensions. 12 MaterIals and MethodThe sample consisted of 199 adults aged between 18 to 26 years, among whom 97 were males and 102 females, selected from the clinical examination of 1703 Yemeni adults.Following criteria were used for sample selection: full complement of permanent dentition (excluding third molars); Class I molar and canine relation; Class I skeletal relationship (decided visually by using two-finger technique); free of local factors that disturb the integrity of dental arches (e.g. congenital missing teeth, retained deciduous teeth, supernumerary teeth); normal overjet and overbite relation; no heavy restorations that may affect the dental arch size and form; no previous orthodontic or facial surgical treatment; well-aligned arches with less than 2 mm of spacing or crowding in either arch.Measurements were taken from 398 maxillary and mandibular dental casts, which were made of dental stone with plaster of Paris base. The base was trimmed and numbered corresponding to the number given to the subjects. Dental arch dimensions were measured using the modified sliding calipe...

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Section: Introductionmentioning

confidence: 99%

Establishment of Yemeni Dental Arch Form

Al-Zubair

2013

Orthod J Nepal

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“…La curva catenaria fue formada simplemente por la suspensión de una cadena de largo adecuado desde dos puntos de ancho variable (por ejemplo, el ancho de los molares más distales en la forma de arco) (MacConaill & Scher, 1949). Scott (1957), Burdie & Lillie (1966) y Musich & Ackerman (1973) apoyaron la forma de curva catenaria como forma de arco ideal. Brader (1972) respecto a la geometría de la curva de la forma de arco dental dijo ser la mejor aproximación a una curva cerrada con las propiedades inherentes en la elipse trifocal, con los dientes ocupando sólo la porción del extremo estrecho de la curva.…”

Section: Introductionunclassified

Morfología del Arco Maxilar y Mandibular en Niños de Ascendencia Mapuche y no Mapuche

S¹,

Sandoval²

2011

Int. J. Morphol.

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INTRODUCCIÓN La forma de arco ideal se ha tratado de determinar desde los inicios de la ortodoncia. Existen variaciones interindividuales asociadas a género, raza, influencias am-bientales, entre otros, y a lo largo del crecimiento en un mis-mo individuo. En 1885, Bonwill notó la forma trípode de la mandíbula, que forma un triángulo equilátero con la base extendida de cóndilo a cóndilo y los lados de cada cóndilo a la línea media de los incisivos centrales (Bonwill, 1984-1985). Hawley (1905), usó algunos de los principios de Bonwill, proponiendo un método geométrico para la cons-trucción de la forma ideal de arco. Black (1902) estableció que los dientes superiores están ordenados en una semi-elipse y que los dientes inferiores están ordenados similarmente en una pequeña curva. Broomell (1902), en el mismo año dijo que "los dientes están ordenados en los maxilares en la forma de dos curvas parabólicas". En 1907, Angle discutió en detalle la "línea de oclu-sión", que él definió como "la línea con la cual, de acuerdo al tipo en forma y posición, los dientes deben estar en armonía aunque en oclusión normal". Dijo, que la forma de ésta línea se parecía a una curva parabólica, pero una que varía muchí-simo debido a raza, tipo, temperamento, etc. (Angle, 1907). El texto Gray's Anatomy en 1942, estableció: "El arco dental maxilar forma una curva elíptica y el arco dental mandibular forma una curva parabólica" (Johnston & Whillis, 1942). En 1934, Chuck destacó la variación en la forma de arco humano y fue el primero en clasificar las formas de arco como cuadrada, redonda, oval y estrecha (Chuck, 1934). Así, a través de los años las formas de arco de Bonwill-Hawley han sido las formas de arco más consistentemente usadas como plantilla de inicio para los ortodoncistas de arco de canto. En 1949, MacConaill & Scher establecieron que considerando la línea de oclusión, sería imposible para una elipse y una pará-bola encontrarse en uno o cualquier punto. El concluyó, que la descripción elipse-parábola de los dos arcos dentales, aun-que elegante, no tiene relación inmediata a la función. Esta-bleció, que una buena y bien sabida curva, la curva catenaria, calza en muchos casos con exactitud por lo que podía ser con

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“…Um erro de considerável magnitude na estimativa do perímetro do arco dental pode drasticamente alterar o plano de tratamento (5).…”

Section: Resultados Discussãounclassified

“…Nesta análise de modelos para se obter a discrepância do perímetro do arco necessita-se fazer a medição do espaço presente, que é a base óssea disponível para o alinhamento dos dentes e a mensuração do espaço requerido, que constitui a soma dos diâmetros mésio-distais dos dentes (3)(4)(5).…”

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Análise da Confiabilidade de Métodos Utilizados na Medição do Espaço Presente

Tenório¹,

Omena²,

Matta³

2012

Pesqui. bras. odontopediatria clín. integr.

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Objetivo: Avaliar um método digital de mensuração de espaços, MBRuler (MBR), para a medição do espaço presente na discrepância de modelos em Ortodontia em relação aos métodos tradicionais, assim como também avaliar a confiabilidade destes métodos. Método: Foram reproduzidos 20 modelos inferiores de desdentados totais sobre os quais foram montadas bases de prova de cera onde foram fixados dentes de estoque. O espaço presente foi mensurado por um único avaliador, utilizando-se o método da segmentação do arco, fio de latão e MB-Ruler. Em seguida, os dentes foram removidos da cera e realizada a medição dos seus diâmetros mésio-distais, cujo somatório dos mesmos constituiu o controle. Os valores médios do espaço presente mensurado pelos três métodos foram comparados entre si e em relação ao controle pelo teste "t" de Student a 5% com o auxílio do programa SPSS (Statistical Package for Social Sciences), versão 15.0. Resultados: Os valores médios encontrados de 64,23 mm, 65,25 mm e 60,31 mm para os diferentes métodos utilizados, segmentação do arco, fio de latão e MBR, respectivamente, apresentaram diferenças estatisticamente significativas (p<0,05). Todos os métodos, quando comparados com o controle de 63,81 mm, apresentaram diferenças significativas entre as médias (p< 0, 001), sendo a menor diferença entre segmentação do arco e controle e a maior entre MBR e controle. Conclusão: O método MB-Ruler apresentou valores médios com maiores discrepâncias em relação ao controle, enquanto o método de segmentação do arco obteve valores médios mais próximos, seguido do fio de latão. Nenhum dos métodos avaliados expressou com exatidão o espaço presente no cálculo da discrepância de modelos.Modelos dentários; Ortodontia; Arco dental.Objective: To evaluate a digital method for space measurement, MBRuler (MBR), for measuring the space in the discrepancy of models in Orthodontics in relation to the traditional methods, as well as evaluate the reliability of these methods. Method: Twenty total edentulous mandibular models were reproduced and received wax bases in which were fixed artificial teeth. The present space was measured by a single examiner using the arch segmentation method, brass wire and MB-Ruler. Next, the teeth were removed from the wax and their mesiodistal diameters were measured, and their sum was the control. The mean values of the space measured by the three methods were compared among each other and with the control by the Student's t-test at 5% significance level using the SPSS software (Statistical Package for Social Sciences), version 15.0. Results:The mean values obtained were 64.23 mm, 65.25 mm and 60.31 mm for arch segmentation, brass wire and MBR, respectively, with statistically significant differences (p<0.05) among them. All methods differed significantly (p<0.001) from the control (63.81 mm), with the lowest difference between arch segmentation and the control and the highest between MBR and the control. Conclusion: The MB-Ruler method presented mean values with higher discrepancies in relation to the c...

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The catenometer: A reliable device for estimating dental arch perimeter

Cited by 46 publications

References 12 publications

Establishment of Yemeni Dental Arch Form

Establishment of Yemeni Dental Arch Form

Morfología del Arco Maxilar y Mandibular en Niños de Ascendencia Mapuche y no Mapuche

Análise da Confiabilidade de Métodos Utilizados na Medição do Espaço Presente

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