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对象和方法 1.适应症:牙冠唇面无严重缺损,经严密根管充填的变色前牙。 2.漂白前准备:(1)从冠舌面取出窝洞及髓室的充填物,保留根管充填物。(2)清理髓室,去尽髓角处残髓,显露洞内牙本质。(3)在根管口以下2mm处,用磷酸锌水门汀密封。 3.器械与药物:(1)1141型高频电刀(上海手术器械八厂生产)。(2)漂白剂:30％双氧水与等量的过硼酸钠,临用时调拌成糊剂。(3)酸处理液:50％磷酸。(4)无水酒精。(5)凡士林等。 4.漂白方法:(1)髓室内用无水酒精涂擦,脱脂。(2)酸处理液涂髓室壁2分钟,水冲洗。(3)凡士林涂龈缘。(4)隔湿,涂无水酒精,吹干。(5)浸漂白剂棉球置入髓室,高频电刀工作头接近棉球(图1),间
Objects and methods 1. Indications: no serious dental crown defects, the root canal after filling the discoloration of tight root canal. 2. Preparation before bleaching: (1) Remove the filling of the cavity and pulp chamber from the crown tongue surface and keep the filling of the root canal. (2) to clean the pulp chamber, to make the marrow of the marrow, reveal the dentin cave. (3) 2mm below the root canal mouth, sealed with zinc phosphate cement. 3. Instruments and Drugs: (1) 1141-type high-frequency electric knife (Shanghai surgical instruments eight plant production). (2) bleach: 30% hydrogen peroxide and the same amount of sodium perborate, temporary mix into a paste. (3) Acid treatment solution: 50% phosphoric acid. (4) anhydrous alcohol. (5) Vaseline and so on. Bleaching methods: (1) pulp chamber rubbed with anhydrous alcohol, degreasing. (2) acid treatment solution tartar wall 2 minutes, water rinse. (3) Vaseline gingival margin. (4) Moisture, coated with anhydrous alcohol, dry. (5) Baptist bleaching agent into the pulp chamber cotton chamber, high frequency electric knife work head close to the cotton ball (Figure 1), between