CORDLESS TISSUE RETRACTION FOR IMPRESSIONS FOR FIXED PROSTHESIS
CORDLESS TISSUE RETRACTION FOR IMPRESSIONS FOR FIXED PROSTHESIS
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DOI：
10.1016/0022-3913(67)90009-1
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发表时间：
1967-01-01
影响因子：
4.6
通讯作者：
LAFORGIA, A
中科院分区：
文献类型：
--
作者：
LAFORGIA, A
随着许多新的印模材料的出现，用于固定假体印模的组织回缩的新方法应运而生。使用了脐带组织回缩，LE3，但化学物质进入全身循环是一个问题。电外科组织回缩‘+产生了沟，但仍需要脐带回缩。许多类型的丙烯酸树脂*的开发使化学浸渍绳索的使用变得不再必要。仅适用于多硫化物和硅橡胶印模材料的无绳组织回缩可分为四个步骤：(1)重新打印初步印模，(2)在冷固化的丙烯酸树脂托盘上打珠，(3)纠正不可接受的最终印模，以及(4)在铝壳中制作印模。重新给人留下初步印象。一块湿石棉垫片被放在一个诊断石膏上，这个石膏上有缺失的牙齿。这种垫片被放置在要准备的牙齿和任何要修复的“蜡化”无牙区。制作了丙烯酸树脂托盘，用重型橡胶基印模材料制作了初步印模。在将托盘放入适当位置以制作印模之前，将基牙部分干燥。初步印模被取出(图1)，并准备成为最终印模的印模托盘。取出多余的橡胶，并修剪托盘。橡胶基材是用毛刺修剪的，所以边缘的印记将是托盘最上面的部分(图2)。在橡胶底座印模的外表面上画出神奇的标记线，作为指引线。这个初步印模的所有切牙和咬合部分都被穿孔，以产生多余印模材料的逃逸通风口。将常规车身橡胶基材混合装入初步印模中。然后，填充的印模托盘被放置到位，如魔术标记参考线所示。基牙的排气孔永远不会
A long with the many new impression materials, new methods of tissue retraction for fixed prosthetic impressions were developed. Cord tissue retraction was used, le3 but chemical absorption into the general circulation was a problem. Electrosurgical tissue retraction’+ produced the sulcus, but it still required cord retraction. The development of many types of acrylic resins* has made the use of chemically impregnated cords unnecessary. Cordless tissue retraction, which is applicable only to polysulfide and silicone rubber base impression materials, may be divided into four procedures:(1) Relining a preliminary impression,(2) beading a coldcuring acrylic resin tray,(3) correcting an unacceptable final impression, and (4) making an impression in an aluminum shell. Relining a preliminary impression. A spacer of wet asbestos is placed on a diagnostic cast which has the missing teeth waxed in. This spacer is placed over the teeth to be prepared and any “waxed-in” edentulous regions to be restored. An acrylic resin tray is made.A preliminary impression is made of the complete preparation with heavy body rubber base impression material. The abutment teeth are partially dried before placing the tray into position to make the impression. The preliminary impression is removed (Fig. 1) and prepared to become the impression tray for the final impression. The surplus rubber is removed and the tray is trimmed. The rubber base material is trimmed with burs so that the impression of the margins will be the most superior part of the tray (Fig. 2). Magic marker lines are made on the external surface of the rubber base impression to serve as guide lines. All of the incisal and the occlusal portions of this preliminary impression are perforated to create escape vents for excess impression material. Regular body rubber base material is mixed and loaded into the preliminary impression. The filled impression tray is then placed into position as indicated by the magic marker guide lines. The vent holes of the abutment teeth are never