Does an incremental filling technique reduce polymerization shrinkage stresses?
Does an incremental filling technique reduce polymerization shrinkage stresses?
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增量填充技术是否可以降低聚合收缩应力？
DOI：
10.1177/00220345960750030301
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发表时间：
1996
影响因子：
7.6
通讯作者：
Sakaguchi,RL
中科院分区：
文献类型：
--
作者：
Versluis,A;Douglas,WH;Cross,M;Sakaguchi,RL
人们普遍认为，在修复复合材料聚合过程中的体积收缩和固化与硬组织的结合导致修复牙齿的腔壁的应力传递和向内变形。在填充过程中，壁的变形减小了腔的尺寸。这一事实有着深远的影响，在本文中提出和讨论，即增量充填技术减少了牙齿上的复合收缩的应力效应。对不同增量充填工艺的应力场进行了数值模拟。分析表明，在一个修复与牙齿建立良好的债券，因为通常需要增量填充技术增加了变形的修复牙齿。该增加是由制备物的增量变形引起的，其有效地减少了填充腔体所需的复合物的总量。这导致更高应力的齿复合结构。该研究还表明，牙尖间距离测量的评估以及基于收缩应力状态概括的简化不足以表征牙齿修复复合体中聚合收缩的影响。出于致密化、适应性、固化彻底性和粘结形成等原因，可能需要保留增量填充方法。然而，很难证明由于缩减效应的减少而需要保留递增。
It is widely accepted that volumetric contraction and solidification during the polymerization process of restorative composites in combination with bonding to the hard tissue result in stress transfer and inward deformation of the cavity walls of the restored tooth. Deformation of the walls decreases the size of the cavity during the filling process. This fact has a profound influence on the assumption-raised and discussed in this paper-that an incremental filling technique reduces the stress effect of composite shrinkage on the tooth. Developing stress fields for different incremental filling techniques are simulated in a numerical analysis. The analysis shows that, in a restoration with a well-established bond to the tooth-as is generally desired-incremental filling techniques increase the deformation of the restored tooth. The increase is caused by the incremental deformation of the preparation, which effectively decreases the total amount of composite needed to fill the cavity. This leads to a higher-stressed tooth-composite structure. The study also shows that the assessment of intercuspal distance measurements as well as simplifications based on generalization of the shrinkage stress state cannot be sufficient to characterize the effect of polymerization shrinkage in a tooth-restoration complex. Incremental filling methods may need to be retained for reasons such as densification, adaptation, thoroughness of cure, and bond formation. However, it is very difficult to prove that incrementalization needs to be retained because of the abatement of shrinkage effects.