The predictability of arch expansion with the Invisalign First system in children with mixed dentition: a retrospective study

The predictability of arch expansion with the Invisalign First system in children with mixed dentition: a retrospective study.

抄録

この研究は、インビザライン・ファースト®システムで治療した早期混合歯列の小児におけるアーチ拡大の予測可能性を定量化し、アーチ拡大の予測可能性の臨床的要因を評価することを目的とした。アーチ拡大を計画した平均（標準偏差）年齢8.42歳（0.93歳）の小児90名について、インビザラインのClinCheck®ソフトウェアから治療前、予測、治療後のデジタルモデルを入手した。アーチ幅の測定は、インビザラインのアーチ幅表を使用して収集しました。The predictability of expansion was calculated by comparing the amount of expansion achieved with the predicted expansion.拡大予測可能性に関連する臨床因子を評価するために線形回帰分析を使用した。上顎歯の拡大予測率は以下の通りであった：乳犬歯71.1％（n=55）、第一大臼歯67.5％（n=46）、第二大臼歯65.2％（n=79）、第一大臼歯53.4％（n=90）であり、下顎歯の拡大予測率は乳犬歯81.1％（n=31）、第一大臼歯81.2％（n=51）、第二大臼歯77.8％（n=80）、第一大臼歯69.4％（n=90）であった。下顎弓は下顎弓の下顎弓の下顎弓の下顎弓の下顎弓の下顎弓の下顎弓の下顎弓、下顎弓の下顎弓の下顎弓の下顎弓の下顎弓を下顎弓を下顎弓の下顎弓を下顎弓を下顎弓を下顎弓の下顎弓を下顎弓の下顎弓を下顎弓を下顎弓を下顎弓を上下顎永久歯第一大臼歯、第一大臼歯第二大臼歯、上顎第一犬歯では、アライナーごとの予測拡大量が増加するにつれて予測可能性が有意に低下した。、、、ー上顎第一大臼歯、、ー下顎第二大臼歯のー上顎第一大臼歯、ー下顎第二大臼歯のー上顎第一大臼歯のー上顎第一大臼歯のー下顎第二大臼歯エイ上顎第一大臼歯の学会の学弓の学弓の学弓拡大予測能は学弓と学歯牙の学歯牙の学歯牙の学歯牙学歯牙学The amount of predicted expansion per aligner and the number of attachments to the maxillary teeth are potential clinical factors that can affect the predictability of expansion.

This study aimed to quantify the predictability of arch expansion in children with early mixed dentition treated with the Invisalign First® system and evaluate the clinical factors for the predictability of arch expansion. Pretreatment, predicted and posttreatment digital models from Invisalign's ClinCheck® software were obtained for 90 children with mean (standard deviation) age of 8.42 (0.93) who planned arch expansion. Arch width measurements were collected using Invisalign's arch width table. The predictability of expansion was calculated by comparing the amount of expansion achieved with the predicted expansion. Linear regression analysis was used to evaluate clinical factors associated with predictability of expansion. The predictability of the expansion of the maxillary teeth was as follows: 71.1% primary canines (n = 55), 67.5% first primary molars (n = 46), 65.2% second primary molars (n = 79), and 53.4% first permanent molars (n = 90); the predictability of the expansion of the mandibular teeth was 81.1% primary canines (n = 31), 81.2% first primary molars (n = 51), 77.8% second primary molars (n = 80), and 69.4% first permanent molars (n = 90). The predictability of arch expansion was significantly higher in the mandibular arch compared to the maxillary arch and significantly lower in the permanent first molar than in the other primary teeth. Predictability decreased significantly as the amount of predicted expansion per aligner increased in the upper and lower permanent first molars, primary second molars, and upper primary canines. Predictability significantly increased when buccal or palatal attachments were placed on the bilateral side compared to cases without attachment at the upper permanent first and primary second molars. The predictability of arch expansion using the Invisalign First® system varies according to arch and tooth type. The amount of predicted expansion per aligner and the number of attachments to the maxillary teeth are potential clinical factors that can affect the predictability of expansion.