Zirconia endocrown with intracanal extension and zirconia posts on maxillary molars: in silicio study.

IF 1.3 4区 医学 Q3 DENTISTRY, ORAL SURGERY & MEDICINE Quintessence international Pub Date : 2024-10-25 DOI:10.3290/j.qi.b5798352
İrfan Akpınar, Deniz Yanık
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Abstract

Objective: The study aims to evaluate the stress distribution on tooth and restoration of zirconia endocrowns with pulp chamber or intracanal extension and zirconia post performed maxillary first molar using finite element analysis.

Method and materials: Three three-dimensional endodontically treated maxillary molars were modeled. Cortical bone and cementum were modeled 2 mm and 200 μm in thickness. Periodontal ligament at 250 μm thickness was constructed. Zirconia endocrown with pulp chamber extension of 2 mm (Model E+PCE), zirconia endocrown with intracanal extension of 4 mm (Model E+ICE), and zirconia post of 4 mm and crown (ZP) were modeled using software. All restoration models were placed on the maxillary molars. Models were subjected to 400 N loading from the three occlusal contact points. Von Mises stress was recorded.

Results: Expectingly, points where the stress was applied showed high stress compared to other regions of the models. The stress did not occur at the trifurcation in any of the models. For the stresses occurring in the restoration material, there were 14.67 MPa, 57.79 MPa, and 155.56 MPa, in Models E+PCE, E+ICE, and ZP, respectively. At the remaining dentin, these values were 47.04 MPa, 32.85 MPa, and 33.42 MPa in Models E+PCE, E+ICE, and ZP, respectively.

Conclusions: Within the limitation of the study, zirconia endocrowns with intracanal extension exhibit more favorable stress distribution in both restoration material and dentin compared to zirconia posts and pulpal extension endocrowns. These findings suggest that endocrown with intracanal extension may be a better restorative option for reducing stress.

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上颌磨牙的氧化锆内冠与牙槽内扩展和氧化锆柱:硅胶研究。
研究目的该研究旨在使用有限元分析法评估上颌第一磨牙中带有牙髓腔或根管内延伸的氧化锆内冠和氧化锆桩的牙齿和修复体的应力分布:对三颗经过牙髓治疗的上颌磨牙进行三维建模。皮质骨和骨水泥的厚度分别为 2 毫米和 200 微米。牙周韧带的厚度为 250 微米。使用软件制作了牙髓腔延伸 2 毫米的氧化锆内冠(E+PCE 型)、牙髓腔内延伸 4 毫米的氧化锆内冠(E+ICE 型)以及 4 毫米的氧化锆柱和牙冠(ZP 型)。所有修复模型都放置在上颌磨牙上。从三个咬合接触点对模型施加 400 N 的负荷。记录冯米斯应力:结果:与模型的其他区域相比,受力点的应力较高。在所有模型中,三叉点都没有出现应力。修复材料中的应力在 E+PCE、E+ICE 和 ZP 模型中分别为 14.67 兆帕、57.79 兆帕和 155.56 兆帕。在剩余牙本质上,模型 E+PCE、E+ICE 和 ZP 的这些值分别为 47.04 兆帕、32.85 兆帕和 33.42 兆帕:在研究的限制条件下,与氧化锆桩和牙髓延伸内冠相比,具有牙髓内延伸的氧化锆内冠在修复材料和牙本质中都表现出更有利的应力分布。这些研究结果表明,带有牙髓内扩展的内冠可能是减少应力的更好的修复选择。
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来源期刊
Quintessence international
Quintessence international 医学-牙科与口腔外科
CiteScore
3.30
自引率
5.30%
发文量
11
审稿时长
1 months
期刊介绍: QI has a new contemporary design but continues its time-honored tradition of serving the needs of the general practitioner with clinically relevant articles that are scientifically based. Dr Eli Eliav and his editorial board are dedicated to practitioners worldwide through the presentation of high-level research, useful clinical procedures, and educational short case reports and clinical notes. Rigorous but timely manuscript review is the first order of business in their quest to publish a high-quality selection of articles in the multiple specialties and disciplines that encompass dentistry.
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