The influence of different cement spaces on the marginal gap of lithium disilicate crowns constructed by two scanner and milling unit combinations

IF 1.9 4区医学 Q2 DENTISTRY, ORAL SURGERY & MEDICINE Australian dental journal Pub Date : 2024-03-12 DOI:10.1111/adj.13014

J Dudley, J Xu

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Abstract

Background

This study compared the marginal gaps of CAD/CAM lithium disilicate (LDS) crowns constructed using a contemporary and older scanner/milling unit combination at three different cement spaces.

Methods

Twenty-four undergraduate students prepared a Columbia model lower left first molar for an LDS crown in a simulated environment. From each crown preparation, one LDS crown was constructed using an E4D scanner/E4D milling unit (E4DS/E4DM) and TRIOS 3 scanner/Sirona inLab MC X5 milling unit (TRIO/MCX5) at cement space settings of 50, 100 and 200 μm. Each LDS crown was positioned onto the original crown preparation, and then a stereomicroscope was used to make three vertical marginal gap measurements at four locations (mid-buccal, mid-lingual, mid-mesial and mid-distal). The mean marginal gap (MMG) was calculated for each crown and each individual tooth surface.

Results

The MMGs of CAD/CAM LDS crowns constructed by TRIO/MCX5 were 72.31 at 50, 63.73 at 100 μm and 46.23 μm at 200 μm, which were smaller than E4DS/E4DM at each cement space.

Conclusions

Increasing the cement space decreased the MMG in both scanner/milling unit combinations. The smallest MMG was found using the newer scanner/milling unit at the 200 μm cement space. © 2024 Australian Dental Association.

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使用两种扫描仪和铣削装置组合制作的二硅酸锂冠，不同的粘接剂空间对边缘间隙的影响。

背景：本研究比较了在三种不同的粘接间隙下使用当代和老式扫描仪/铣削装置组合制作的CAD/CAM二硅酸锂（LDS）牙冠的边缘间隙：二十四名本科生在模拟环境中为哥伦比亚模型左下第一磨牙制作 LDS 牙冠。使用 E4D 扫描仪/E4D 铣削装置（E4DS/E4DM）和 TRIOS 3 扫描仪/Sirona inLab MC X5 铣削装置（TRIO/MCX5），在 50、100 和 200 μm 的骨水泥间隙设置下，为每个牙冠制备一个 LDS 牙冠。将每个 LDS 牙冠放置在原始牙冠制备体上，然后使用体视显微镜在四个位置（颊中、舌中、趾中和趾间）进行三次垂直边缘间隙测量。计算出每个牙冠和每个牙面的平均边缘间隙（MMG）：TRIO/MCX5制作的CAD/CAM LDS牙冠在50μm、100μm和200μm时的平均边缘间隙分别为72.31μm、63.73μm和46.23μm：结论：在两种扫描仪/铣削单元组合中，增大水门汀间隙都会降低MMG。在 200 μm 骨水泥间隙时，使用较新的扫描仪/铣削装置发现的 MMG 最小。© 2024 澳大利亚牙科协会。

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来源期刊

Australian dental journal 医学-牙科与口腔外科

CiteScore

4.20

自引率

4.80%

发文量

审稿时长

6-12 weeks

期刊介绍： The Australian Dental Journal provides a forum for the exchange of information about new and significant research in dentistry, promoting the discipline of dentistry in Australia and throughout the world. It comprises peer-reviewed research articles as its core material, supplemented by reviews, theoretical articles, special features and commentaries.

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