title: [The establishment and analysis of expending dental arch]
abstract: Expending dental-arch is one of the methods being used popularly in orthodontics.but there are few researches on its basical laws.In this paper,we used mathematic methods to discuss the relationship of the arch-length(S),the width(A),and the length of dental-arch(H).We devised a mathematic model,hoping it could be useful to orthodontic therapy.
authors.affiliation: College of Stomatology, Hubei University. Hubei 430070, China.
authors.forename: X M
authors.initials: XM
authors.lastname: Zhang
authors.forename: K Y
authors.initials: KY
authors.lastname: He