Impact of endodontic access cavity preparation on the fracture resistance of CAD-CAM crowns.

IF 2.6 2区医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE

BMC Oral Health Pub Date : 2025-07-11 DOI:10.1186/s12903-025-05934-2

Abdelazim Gamal, Mohamed F Aldamaty, Hussein R Mohamed, Hesham I Othman

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引用次数: 0

Abstract

Purpose: The present research aimed to assess the impact of endodontic access cavity preparation on the fracture resistance of CAD-CAM crowns.

Materials and methods: A total of 40 extracted human upper first premolars were utilized in present research. All premolars were affixed in epoxy resin blocks, prepared by utilizing a CNC milling machine to receive full coverage ceramic crowns, and evenly split into two primary groups based on the type of ceramic; Group LD: teeth restored with lithium-disilicate (LD) crowns, and Group PIC: teeth restored with polymer-infiltrated ceramic (PIC) crowns. Every group was subdivided into 2 subgroups (n=10); Subgroup LDI: Intact LD crowns, Subgroup LDR: Repaired LD crowns, Subgroup PICI: Intact vita PIC crowns, and Subgroup PICR: Repaired PIC crowns. Crowns were cemented using Calibra Universal resin cement. The repaired subgroups received a standardized access cavity at the center of the occlusal surface and then repaired with direct composite resin. All samples were exposed to thermo-mechanical loading in a chewing simulator for 118,000 cycles, loaded until failure, and then statistically analyzed.

Results: For intact control subgroups, the greatest mean scores were showed in PICI (1308.71±244.15 N) compared to LDI (1154.38±133.83 N), and the variation was not statistically significant (P=0.097). For repaired subgroups, the highest mean values were recorded for PICR (727.84±240.52 N) compared to LDR (707.03±298.28 N), and the variation was not statistically significant (P=0.866).

Conclusions: Both LD and PIC crowns perform the same after exposure to an endodontic access cavity, suggesting their repairability and useability.

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根管通道预备对CAD-CAM冠抗折断性的影响。

目的：研究根管通道预备对CAD-CAM冠抗折性的影响。材料与方法：采用40颗拔除的人类上颌第一前磨牙进行研究。所有的前磨牙都固定在环氧树脂块中，利用数控铣床制备全覆盖陶瓷冠，并根据陶瓷类型均匀分成两组；LD组：用二硅酸锂（LD）冠修复牙齿，PIC组：用聚合物渗透陶瓷（PIC）冠修复牙齿。每组再分为2个亚组（n=10）；LDI亚组：完整的LD冠，LDR亚组：修复的LD冠，PICI亚组：完整的vita PIC冠，PICR亚组：修复的PIC冠。冠用Calibra通用树脂胶结。修复后的亚组在咬合面中心放置标准化的通道腔，然后直接使用复合树脂修复。所有样品在咀嚼模拟器中进行热机械加载118,000次，加载至失效，然后进行统计分析。结果：在完整对照亚组中，PICI（1308.71±244.15 N）比LDI（1154.38±133.83 N）的平均评分最高，差异无统计学意义（P=0.097）。修复亚组PICR平均值（727.84±240.52 N）高于LDR平均值（707.03±298.28 N），差异无统计学意义（P=0.866）。结论：LD和PIC冠暴露于根管通道腔后表现相同，表明它们具有可修复性和可用性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

BMC Oral Health DENTISTRY, ORAL SURGERY & MEDICINE-

CiteScore

3.90

自引率

6.90%

发文量

481

审稿时长

6-12 weeks

期刊介绍： BMC Oral Health is an open access, peer-reviewed journal that considers articles on all aspects of the prevention, diagnosis and management of disorders of the mouth, teeth and gums, as well as related molecular genetics, pathophysiology, and epidemiology.