静岡も梅雨明けでしょうか？

いよいよ本格的な暑さがやってきました。

さて、今回は矯正治療によって生じる外部吸収を

既根管治療歯と生活歯とで比較した論文です。

対象者の根管治療は矯正治療開始前に終了し

既根管治療歯を対象歯、反対側同名生活歯をコントロールとしました。

吸収量の計測は1年以上の矯正治療終了の後

デジタルパノラマX線写真上で行われました。

To determine whether root filled teeth and those with vital pulps exhibit a similar degree of external root resorption (ERR) as a consequence of orthodontic treatment.

The study sample consisted of 77 patients, with a mean age of 32.7 +/- 10.7 years, who had one root filled tooth before completion of multiband/bracket orthodontic therapy for at least 1 year. For each patient, digital panoramic radiographs taken before and after orthodontic treatment were used to determine the proportion of external root resorption (PRR), defined as the ratio between the root resorption in the root filled tooth and that in its contralateral tooth with a vital pulp. The student’s t-test, anova and logistic regression analysis were used to determine statistical significance.

The mean PRR was 1.00 +/- 0.13, indicating that, in the total sample, there were no significant differences in root resorption in the root filled teeth and their contralateral teeth with vital pulps. Multivariate logistic regression analysis suggested that PRR was significantly greater in incisors (P = 0.0014; odds ratio = 6.2885, C.I. 95% = 2.0-19.4), compared to other teeth, and in women (P = 0.0255; odds ratio = 4.2, C.I. 95% = 1.2-14.6), compared to men.

There was no significant difference in the amount or severity of external root resorption during orthodontic movement between root filled teeth and their contralateral teeth with vital pulps.

つまり

全調査対象歯について、既根管治療歯と生活歯の外部吸収の程度に

有意差は無かったとのことです。

引用文献

Llamas-Carreras JM, Amarilla A, Solano E, Velasco-Ortega E, Rodríguez-Varo L, Segura-Egea JJ.

Study of external root resorption during orthodontic treatment in root filled teeth compared with their contralateral teeth with vital pulps.

Int Endod J. 2010 Aug;43(8):654-62.