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歯エナメル質の硬度，表面粗さ，色調に及ぼす漂白剤の影響
Effect of bleaching agents on hardness, surface roughness and color parameters of dental enamel.
PMID: 32905007 PMCID: PMC7462371. DOI: 10.4317/jced.56913.
抄録
背景:
本研究では、異なる濃度の過酸化カルバミド（CP）と過酸化水素（HP）が、牛歯の硬さ、粗さ、色のパラメータ（色の変化-ΔE、明るさ-ΔL、黄-青軸-Δb）に及ぼす影響を評価した。
Background: In this study was evaluated the effect of carbamide peroxide (CP) and hydrogen peroxide (HP) in different concentrations on hardness, roughness, and color parameters (color change - ΔE, lightness - ΔL, and yellow-blue axis - Δb) of bovine teeth.
材料と方法:
50個の正方形のデンタルブロック（7×7×2mm）を、Knoop硬度、表面粗さ（Ra）、および色のパラメータの初期測定に供した。対照群は実験期間中，人工唾液で保管し，CP 20%は14日間毎日2時間，HP 9.5%は14日間毎日30分間漂白し，HP 38%は漂白用ゲルを15分間塗布した後，ゲルを除去して再度塗布することを2回繰り返し，7日ごとに2回，計3回の漂白を行い，CP 45%は30分ずつ3回，7日間で7回の漂白を行った．漂白処置後のすべてのグループは、漂白用ジェルを除去して洗浄し、人工唾液で保管した。漂白処置の終了時に，硬さ，粗さ，および色のパラメータ（ΔE，ΔL，Δb）を再評価した。データはANOVA，Tukey，Dunnett検定で解析した（α＝0.05）。
Material and Methods: Fifty square dental blocks (7 x 7 x 2 mm) were submitted to initial readings of Knoop hardness, surface roughness (Ra), and color parameters. Specimens were divided into 5 groups (n = 10): control group was kept in artificial saliva during the experimental period; CP 20% was bleached for 2 h daily for 14 days, HP 9.5% was bleached for 30 min daily for 14 days, HP 38% the bleaching gel was applied for 15 min, gel was removed and it was reapplied for two more times, the bleaching session was repeated for another 2 times every 7 days, totaling three sessions, and in CP 45% three sessions of 30 min each were performed of 7 in 7 days. All groups after the bleaching procedures had the bleaching gel removed, washed, and kept in artificial saliva. At the end of bleaching treatment, the hardness, roughness, and color parameters (ΔE, ΔL, and Δb) were re-evaluated. Data were analyzed by ANOVA, Tukey, and Dunnett tests (α = 0.05).
結果:
漂白により硬度の低下が促進され，CP 45%が最も低く，CP 20%が最も高く，HP 9.5%とHP 38%は中間的な硬度を示した。漂白剤は粗さに影響を与えなかった。CP 20%とHP 38%はΔEの値が最も高く，歯の黄ばみの軽減効果が高かった．漂白処理後には，すべてのグループで明度が上昇した．
Results: Bleaching promoted a reduction in hardness, the CP 45% showed the lowest hardness and the CP 20% the highest, the HP 9.5% and HP 38% showed intermediate values of hardness. Bleaching agents did not affect the roughness. CP 20% and HP 38% promoted the highest values of ΔE and higher reduction of yellowish tone of tooth. Lightness increase after bleaching treatment for all groups.
結論:
試験したすべての漂白剤は効果を示したが，歯の硬さは低下した。過酸化カルバミド、過酸化水素、歯のホワイトニング、硬さ、粗さ
Conclusions: All the bleaching agents tested showed effectiveness, but with reduced hardness. Carbamide peroxide, hydrogen peroxide, tooth whitening, hardness, roughness.
Copyright: © 2020 Medicina Oral S.L.