Marginal Fit and Fracture Resistance of Vertical Versus Horizontal Margins in Monolithic Zirconia Crowns

IF 1.7 Q3 DENTISTRY, ORAL SURGERY & MEDICINE

Clinical and Experimental Dental Research Pub Date : 2025-01-23 DOI:10.1002/cre2.70064

Mohamed A. Salama, Mohamed F. Aldamaty, Moamen A. Abdalla, Elsayed Ali Omar, Mohammed H. AbdElaziz, Ahmed Yaseen Alqutaibi

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引用次数: 0

Abstract

Objective

The use of vertical margin design in all-ceramic restoration has generated inquiries regarding its clinical efficacy under diverse dynamic oral conditions. This research aims to assess the marginal fit and fracture resistance of monolithic zirconia crowns featuring vertical margin design as opposed to those with conventional horizontal margin design.

Materials and Methods

Two metal dies were employed to generate replicated resin dies mimicking mandibular first molar preparation. The metal dies were precision-engineered with two margin designs: vertical margin design presenting a shoulderless configuration (Featheredge) and horizontal margin design (Radial Shoulder). Forty zirconia crowns were produced on the replicated resin dies using two varieties of monolithic zirconia, with twenty crowns in each category: pre-shaded and multilayered zirconia. Both sets were further subdivided into two groups based on the finish line configuration utilized (n = 10). The vertical marginal gap of the zirconia crowns was gauged before and after thermocycling (5-55oC/5000 cycles), followed by loading the crowns until fracture occurred. Statistical analysis was performed using one-way analysis of variance (ANOVA), accompanied by Bonferroni's post hoc test and independent t-test for pairwise comparisons.

Results

The Shoulder subgroup of BruxZir exhibited the highest mean marginal gap value (120.06 ± 10.15 µ), while the Featheredge subgroup of BruxZir displayed the lowest value (49.72 ± 6.53 µ). Among the BruxZir group, the Featheredge subgroup showcased the highest mean fracture resistance value (4251.57 ± 279.90 N), whereas the Shoulder subgroup recorded the lowest value (1721.60 ± 225.16 N).

Conclusion

Monolithic zirconia crowns with vertical margin design (Featheredge) demonstrated statistically enhanced performance compared to conventional horizontal margin design, as evidenced by lower marginal gap values and increased fracture resistance tolerance.

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整体氧化锆冠纵向边缘与水平边缘的边缘贴合及抗断裂性能。

目的：探讨垂直切缘设计在不同动态口腔条件下的临床疗效。本研究旨在评估采用垂直边缘设计的整体氧化锆冠与传统水平边缘设计的整体氧化锆冠的边缘配合和抗断裂能力。材料与方法：采用两种金属模具制作模拟下颌第一磨牙制备的树脂复制模具。金属模具精密设计了两种边缘设计：垂直边缘设计呈现无肩结构（羽边）和水平边缘设计（径向肩）。用两种单片氧化锆在复制树脂模具上生产了40个氧化锆冠，每一种有20个冠：预遮蔽氧化锆和多层氧化锆。两组均根据终点线配置进一步细分为两组（n = 10）。在热循环（5-55℃/5000次）前后测量氧化锆冠的垂直边缘间隙，然后加载冠直到发生断裂。统计学分析采用单因素方差分析（ANOVA），两两比较采用Bonferroni事后检验和独立t检验。结果：BruxZir肩关节亚组的平均边缘间隙值最高（120.06±10.15µ），而BruxZir羽毛边缘亚组的平均边缘间隙值最低（49.72±6.53µ）。BruxZir组中，Featheredge亚组平均骨折阻力值最高（4251.57±279.90 N），而Shoulder亚组平均骨折阻力值最低（1721.60±225.16 N）。结论：与传统的水平边缘设计相比，采用垂直边缘设计的单片氧化锆冠（Featheredge）的性能在统计学上有所提高，其边缘间隙值更低，抗骨折耐受性更高。

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来源期刊

Clinical and Experimental Dental Research DENTISTRY, ORAL SURGERY & MEDICINE-

CiteScore

3.30

自引率

5.60%

发文量

165

审稿时长

26 weeks

期刊介绍： Clinical and Experimental Dental Research aims to provide open access peer-reviewed publications of high scientific quality representing original clinical, diagnostic or experimental work within all disciplines and fields of oral medicine and dentistry. The scope of Clinical and Experimental Dental Research comprises original research material on the anatomy, physiology and pathology of oro-facial, oro-pharyngeal and maxillofacial tissues, and functions and dysfunctions within the stomatognathic system, and the epidemiology, aetiology, prevention, diagnosis, prognosis and therapy of diseases and conditions that have an effect on the homeostasis of the mouth, jaws, and closely associated structures, as well as the healing and regeneration and the clinical aspects of replacement of hard and soft tissues with biomaterials, and the rehabilitation of stomatognathic functions. Studies that bring new knowledge on how to advance health on the individual or public health levels, including interactions between oral and general health and ill-health are welcome.