Montalvan Ericka, Vaidyanathan Tritala K, Shey Zia, Janal Malvin N, Caceda Jorge H
Department of Pediatric Dentistry, University of Medicine and Dentistry of New Jersey, Newark, USA.
Pediatr Dent. 2006 Nov-Dec;28(6):531-6.
The purpose of this in vitro study was to evaluate the: (1) shear bond strength (SBS) of acetone and ethanol-based bonding agents to composite resin 24 hours after being bleached with 35% hydrogen peroxide; and (2) interface morphology and mode of fracture (IMMF) between composite resin and enamel.
Forty extracted teeth were randomly assigned into 4 groups: (1) group 1: 35% H2O2 + acetone; (2) group 2: H2O2 + ethanol; (3) group 3: acetone; (4) group 4: ethanol. All teeth were acid etched, bonding agents were applied, and a composite resin stub was bonded and stored again in saline for 24 hours. SBS was determined, and scanning electron microscopy (SEM) was used for IMMF evaluation.
SBS was significantly lower in bleached than unbleached teeth (P < .001), but SBS did not differ between the acetone-based or ethanol-based adhesives (P = .55) and bleaching did not interact with adhesive treatment (P = .39). IMMF analysis of the unbleached teeth showed a continuous interface between the resin and enamel. By contrast, bleached teeth showed sparse contact between the resin and enamel and the resin was poorly infiltrated into the enamel surface.
Morphologic changes in human tooth enamel, 24 hours after bleaching, were associated with a reduction in the shear bond strength of adhesives.
本体外研究的目的是评估：（1）用35%过氧化氢漂白24小时后，丙酮基和乙醇基粘结剂与复合树脂之间 的剪切粘结强度（SBS）；以及（2）复合树脂与牙釉质之间的界面形态和断裂模式（IMMF）。
40颗拔除的牙齿随机分为4组：（1）第1组：35% H₂O₂ + 丙酮；（2）第2组：H₂O₂ + 乙醇；（3）第3组：丙酮；（4）第4组：乙醇。所有牙齿均进行酸蚀，应用粘结剂，粘结复合树脂桩并再次置于盐水中保存24小时。测定SBS，并使用扫描电子显微镜（SEM）评估IMMF。
漂白牙齿的SBS显著低于未漂白牙齿（P <.001），但丙酮基或乙醇基粘结剂之间的SBS无差异（P = 0.55），且漂白与粘结剂处理之间无相互作用（P = 0.39）。未漂白牙齿的IMMF分析显示树脂与牙釉质之间有连续界面。相比之下，漂白牙齿显示树脂与牙釉质之间接触稀疏，且树脂向牙釉质表面的渗透较差。
漂白24小时后，人牙釉质的形态学变化与粘结剂的剪切粘结强度降低有关。
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