Relationship Between Upper Dental Arch Shape and Second Molar Rotation in Primary Dentition

Hung-Huey Tsai

doi:10.6558/MTJM.2003.8(4).2

Relationship Between Upper Dental Arch Shape and Second Molar Rotation in Primary Dentition

貢獻的翻譯標題: 乳齒列上顎第二乳臼齒旋轉度與牙弓型態之關係

Hung-Huey Tsai

研究成果: 雜誌貢獻 › 文章 › 同行評審

摘要

目的　由於第二乳臼齒在決定牙弓型態與大小上扮演重要角色，本研究比較了A、B、C三種不同牙弓型態群(A群牙弓寬大、B群牙弓適中、C群牙弓狹窄)間上顎第二乳臼齒的大小與旋轉度之差異。
方法　使用116個正常咬合兒童之上顎乳齒列牙弓石膏模型咬合面照片，測量11個直線與5個角度項目。
結果　三群間第二乳臼齒的大小無統計上之差異。A群與C群的比較顯示；A群牙弓長度較小、牙弓寬度較大、第二乳臼齒向近心顎側的旋轉度較大。B群的所有測量項目之平均值皆介於A與C群的平均值之間。三群的上顎第二乳臼齒的近心顎側咬頭的平均位置大部分位於上顎第二乳臼齒遠心面中心點至切齒乳頭中心點的連線上。
結論　本研究的結果有利於了解正常乳齒列上顎第二乳臼齒旋轉度之變異性並判斷各種牙弓形態的上顎第二乳臼齒旋轉度是否在於正常範圍內。

貢獻的翻譯標題	乳齒列上顎第二乳臼齒旋轉度與牙弓型態之關係
原文	英語
頁（從 - 到）	192-198
頁數	7
期刊	Mid-Taiwan Journal of Medicine
卷	8
發行號	4
DOIs	https://doi.org/10.6558/MTJM.2003.8(4).2
出版狀態	已發佈 - 2003
對外發佈	是

Keywords

牙弓型態
上顎第二乳臼齒
旋轉
乳齒列

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10.6558/MTJM.2003.8(4).2

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@article{8153bdd3c268440bb4d8c96bdb4f3fa2,

title = "Relationship Between Upper Dental Arch Shape and Second Molar Rotation in Primary Dentition",

abstract = "Objectives. Because the primary second molars play such an important role in determining dental arch type and size, the author compared the size and rotation of the upper primary second molars among three groups of children.Methods. The occlusal surfaces of the upper primary dental casts of 116 children with untreated normal occlusions were measured from standardized photographs (11 linear measurements of tooth size and 5 angular measurements of primary second molar rotation). The children were divided into groups according to their upper dental arch shape: group A, a wide arch, group B, a round arch, and group C, a slender arch.Results. There were few significant differences in the sizes of the upper primary second molars among the three groups. Children in group A had significantly smaller arch lengths, larger arch widths, and more mesiopalatal rotation of the upper primary second molars compared with children in group C. The arch lengths, arch widths, size of the upper primary second molars, and degree of mesiopalatal rotation of the upper primary second molars in children in group B were between those in group A and those in group C. The mean positions of the mesiopalatal cusp of the upper primary second molars were almost on the lines connecting the midpoint of the distal surface of the upper primary second molar to the midpoint of the incisive papilla in each group.Conclusions. These findings may be helpful in understanding the variations in upper primary second molar rotation in normal primary dentition and in determining whether the teeth are in ideal rotations in their dental arch shapes.",

keywords = "dental arch shape, primary dentition, rotation, upper primary second molar, 牙弓型態, 上顎第二乳臼齒, 旋轉, 乳齒列",

author = "Hung-Huey Tsai",

year = "2003",

doi = "10.6558/MTJM.2003.8(4).2",

language = "English",

volume = "8",

pages = "192--198",

journal = "Mid-Taiwan Journal of Medicine",

issn = "1029-3507",

publisher = "中臺灣醫學科學雜誌社",

number = "4",

}

TY - JOUR

T1 - Relationship Between Upper Dental Arch Shape and Second Molar Rotation in Primary Dentition

AU - Tsai, Hung-Huey

PY - 2003

Y1 - 2003

N2 - Objectives. Because the primary second molars play such an important role in determining dental arch type and size, the author compared the size and rotation of the upper primary second molars among three groups of children.Methods. The occlusal surfaces of the upper primary dental casts of 116 children with untreated normal occlusions were measured from standardized photographs (11 linear measurements of tooth size and 5 angular measurements of primary second molar rotation). The children were divided into groups according to their upper dental arch shape: group A, a wide arch, group B, a round arch, and group C, a slender arch.Results. There were few significant differences in the sizes of the upper primary second molars among the three groups. Children in group A had significantly smaller arch lengths, larger arch widths, and more mesiopalatal rotation of the upper primary second molars compared with children in group C. The arch lengths, arch widths, size of the upper primary second molars, and degree of mesiopalatal rotation of the upper primary second molars in children in group B were between those in group A and those in group C. The mean positions of the mesiopalatal cusp of the upper primary second molars were almost on the lines connecting the midpoint of the distal surface of the upper primary second molar to the midpoint of the incisive papilla in each group.Conclusions. These findings may be helpful in understanding the variations in upper primary second molar rotation in normal primary dentition and in determining whether the teeth are in ideal rotations in their dental arch shapes.

AB - Objectives. Because the primary second molars play such an important role in determining dental arch type and size, the author compared the size and rotation of the upper primary second molars among three groups of children.Methods. The occlusal surfaces of the upper primary dental casts of 116 children with untreated normal occlusions were measured from standardized photographs (11 linear measurements of tooth size and 5 angular measurements of primary second molar rotation). The children were divided into groups according to their upper dental arch shape: group A, a wide arch, group B, a round arch, and group C, a slender arch.Results. There were few significant differences in the sizes of the upper primary second molars among the three groups. Children in group A had significantly smaller arch lengths, larger arch widths, and more mesiopalatal rotation of the upper primary second molars compared with children in group C. The arch lengths, arch widths, size of the upper primary second molars, and degree of mesiopalatal rotation of the upper primary second molars in children in group B were between those in group A and those in group C. The mean positions of the mesiopalatal cusp of the upper primary second molars were almost on the lines connecting the midpoint of the distal surface of the upper primary second molar to the midpoint of the incisive papilla in each group.Conclusions. These findings may be helpful in understanding the variations in upper primary second molar rotation in normal primary dentition and in determining whether the teeth are in ideal rotations in their dental arch shapes.

KW - dental arch shape

KW - primary dentition

KW - rotation

KW - upper primary second molar

KW - 牙弓型態

KW - 上顎第二乳臼齒

KW - 旋轉

KW - 乳齒列

U2 - 10.6558/MTJM.2003.8(4).2

DO - 10.6558/MTJM.2003.8(4).2

M3 - Article

SN - 1029-3507

VL - 8

SP - 192

EP - 198

JO - Mid-Taiwan Journal of Medicine

JF - Mid-Taiwan Journal of Medicine

IS - 4

ER -

Relationship Between Upper Dental Arch Shape and Second Molar Rotation in Primary Dentition

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