歯の大きさとアーチの長さの関係および特定のセファロパラメータに基づく上顎および下顎アーチの混合歯列で生じる歯の叢生の評価

Assessment of Dental Crowding Occurring in Mixed Dentition in Maxillary and Mandibular Arches Based on Tooth Size-Arch Length Relationships and Certain Cephalometric Parameters.

抄録

目的:

本研究の目的は、乳歯列および混合歯列における叢生の指標を見つけることであり、将来的な歯列における歯列叢生の発生につながる可能性がある。

AIM: The aim of the study is to find indicators of crowding in primary and mixed dentition that may lead to occurrence of dental crowding in future dentition using dental measurements.

材料と方法:

300名の小児をサンプルとし、年齢により乳歯列群と混合歯列群に分けた。歯列弓の印象を作成し、模型を製作した。その後、Little's irregularity index(LII)による叢生の程度と、歯の大きさと歯列弓の長さの不一致の測定による叢生の程度を評価するために、研究を2つの段階に分けた。適切な統計分析により、叢生群と非叢生群における測定値の相関を評価した。

MATERIALS AND METHODS: A sample of 300 children was selected and divided into two groups based on their age primary dentition and mixed dentition. Dental arch impressions were made and casts were poured. The study was then divided into two phases for assessment of degree of crowding by Little's irregularity index (LII) and by measurement of tooth size-arch length discrepancies. Appropriate statistical analysis was used to assess the correlation of measurements in crowded and noncrowded groups.

結果:

リトル指数は前歯部叢生の指標としては信頼性が低いことがわかった。乳歯列では、下顎非叢生と叢生歯列の犬歯間幅に有意差が認められた。混合歯列では、上顎の非混和歯列と叢生歯列の臼歯間幅、両顎弓の非混和歯列と叢生歯列の切歯合計に有意差が認められた。

RESULTS: It was found that Little's index is less dependable as an indicator of anterior crowding. In the primary dentition, there is significant difference in inter-canine width between lower noncrowded and crowded dentition. In the mixed dentition, there is significant difference in Intermolar width between upper noncrowded and crowded dentition and in sum of incisors between noncrowded and crowded dentition in both the arches.

結論:

リトル指数は、乳歯列と混合歯列の両方において、叢生の信頼できる指標ではない。下顎弓の犬歯間幅は、乳歯列における叢生の指標とみなすことができる。混合歯列では、上顎弓の臼歯間幅、上下顎弓の切歯の合計、上下顎弓の犬歯間幅が叢生の指標と考えられる。

CONCLUSION: Little's index is not a reliable indicator of crowding in both primary and mixed dentition. Inter-canine width of lower arch can be considered as an indicator of crowding in primary dentition. The intermolar width of upper arch, sum of incisors in upper and lower arch and the intercanine width of upper and lower arch can be considered indicators of crowding in the mixed dentition.

引用方法:

Kandakkeel FN, Nagar P, Saseendran A, 歯の大きさとアーチの長さの関係および特定のセファロパラメータに基づく上顎弓と下顎弓の混合歯列で生じる歯の叢生の評価.Int J Clin Pediatr Dent 2023;16(2):357-362.

HOW TO CITE THIS ARTICLE: Kandakkeel FN, Nagar P, Saseendran A, Assessment of Dental Crowding occurring in Mixed Dentition in Maxillary and Mandibular Arches based on Tooth Size-Arch Length Relationships and Certain Cephalometric Parameters. Int J Clin Pediatr Dent 2023;16(2):357-362.