五种家用美白凝胶和一种再矿化凝胶对牙釉质和牙本质超微结构及硬度的影响。

Influence of five home whitening gels and a remineralizing gel on the enamel and dentin ultrastructure and hardness.

作者信息

Pinheiro Helena Burlamaqui, Cardoso Paulo Eduardo Capel

机构信息

Department of Biomaterials, Dental School, University of São Paulo, São Paulo Brazil.

出版信息

Am J Dent. 2011 Jun;24(3):131-7.

PMID:21874930

Abstract

PURPOSE

To investigate the influence of calcium phosphate enhanced home whitening agents on human enamel and dentin surface microhardness and ultramorphology.

METHODS

Five intact molars crowns were used for ultrastructural analysis and five for microhardness test. Each resulting coronal structure was cut in slices. After measuring baseline Knoop Hardness Number (KHN) of the enamel and dentin, the slices were divided into six experimental groups and one control (n= 5). G1= 15% carbamide peroxide (CP); G2= 16% CP; G3= Ca and PO4 (remineralizing agent); G4= 16% CP with Ca and PO4; G5= 7.5% hydrogen peroxide (HP) with Ca and PO4; G6=7.5% HP with Ca. After each daily session of treatment, specimens were stored in distilled water (37 degrees C) until the next session. Products were applied for 2 weeks, according to manufacturers' instructions. Additional KHN weredetermined.

RESULTS

Conventional whitening agents (G1; G2) and the gel with Ca (G6), caused KHN decrease (P< 0.05).The remineralizing and whitening agents with Ca and PO4 (G3; G4; G5) did not change KHN. A change of morphology was observed on enamel and dentin surfaces in G1; G2; G5.

摘要

目的

研究磷酸钙增强型家庭美白剂对人牙釉质和牙本质表面显微硬度及超微形态的影响。

方法

使用五颗完整的磨牙冠进行超微结构分析，另外五颗用于显微硬度测试。将每个所得的牙冠结构切成薄片。在测量牙釉质和牙本质的基线努氏硬度值（KHN）后，将薄片分为六个实验组和一个对照组（n = 5）。G1 = 15% 过氧化脲（CP）；G2 = 16% CP；G3 = 钙和磷酸根（再矿化剂）；G4 = 含钙和磷酸根的16% CP；G5 = 含钙和磷酸根的7.5% 过氧化氢（HP）；G6 = 含钙的7.5% HP。每天治疗结束后，将标本储存在蒸馏水中（37摄氏度）直至下一次治疗。按照制造商的说明，产品应用2周。测定额外的KHN。