Evaluation of polymerization shrinkage stress and cuspal strain in natural and typodont teeth.

IF 1.5 4区 医学 Q3 DENTISTRY, ORAL SURGERY & MEDICINE Brazilian oral research Pub Date : 2024-08-05 eCollection Date: 2024-01-01 DOI:10.1590/1807-3107bor-2024.vol38.0061
Luiza Santos Cardoso, Amanda Alves de Oliveira, Gabrielly D'Paula Muniz Barbosa, Maria Luisa Prazeres Ribeiro, Tainah Costa Firmiano, Crisnicaw Veríssimo
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Abstract

To evaluate the polymerization shrinkage stress and cuspal strain (CS) generated in an artificial (typodont) and in a natural tooth using different resin composites. Twenty artificial and 20 extracted natural molars were selected. Each tooth was prepared with a 4x4 mm MOD cavity. The natural and typodont teeth were divided into four experimental groups (n=10), according to the resin composite used: Filtek Z100 (3M Oral Care) and Beautifil II LS (Shofu Dental). The cavities were filled using two horizontal increments and the CS (µS) was measured by the strain gauge method. Samples were sectioned into stick-shaped specimens and the bond strength (BS) (MPa) was evaluated using a microtensile BS test. Shrinkage stress and CS were analyzed using 3D finite element analysis. No difference was found between the type of teeth for the CS as shown by the pooled averages: Natural tooth: 541.2 A; Typodont model: 591.4 A. Filtek Z100 CS values were higher than those obtained for Beautifil II LS, regardless of the type of teeth. No statistical difference was found for the BS data. Adhesive failures were more prevalent (79.9%). High shrinkage stress values were observed for Filtek Z100 resin, regardless of tooth type. The CS of typodont teeth showed a shrinkage stress effect, generated during restoration, equivalent to that of natural teeth.

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评估天然牙齿和矫正牙齿的聚合收缩应力和牙尖应变。
评估使用不同树脂复合材料在人工牙(类型牙)和天然牙中产生的聚合收缩应力和牙尖应变(CS)。选择 20 颗人工臼齿和 20 颗拔出的天然臼齿。每颗牙齿都准备了一个 4x4 毫米的 MOD 牙洞。根据所用树脂复合材料的不同,天然牙和类型牙被分为四个实验组(n=10):Filtek Z100(3M 口腔护理公司)和 Beautifil II LS(尚福齿科)。用两个水平增量填充龋洞,并用应变计法测量 CS(µS)。将样品切成棒状试样,使用微拉伸 BS 测试评估粘接强度 (BS) (兆帕)。采用三维有限元分析法对收缩应力和 CS 进行了分析。从集合平均值来看,不同类型的牙齿在 CS 方面没有差异:天然牙自然牙:541.2 A;暴牙模型:591.4 A:无论牙齿类型如何,Filtek Z100 的 CS 值都高于 Beautifil II LS 的 CS 值。BS 数据没有统计差异。粘合剂失效更普遍(79.9%)。Filtek Z100 树脂的收缩应力值较高,与牙齿类型无关。类型牙的 CS 在修复过程中产生的收缩应力效应与天然牙相当。
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来源期刊
CiteScore
3.70
自引率
4.00%
发文量
107
审稿时长
12 weeks
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