Finite Element Analysis of Novaloc Attachments at Extreme Angulations and Arch Forms: A Specification Study

IF 4 2区医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE

Clinical Implant Dentistry and Related Research Pub Date : 2025-08-20 DOI:10.1111/cid.70082

Sultan Merve Uçar, Rafat Sasany, Hanan Al-Johani

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引用次数: 0

Abstract

Statement of Problem

Due to its biomechanical advantages, the Novaloc attachment system with angulated abutments has gained popularity in two-implant-supported mandibular overdentures. However, limited data are available on how implant position, angulation, and arch form affect stress and strain distribution within the attachment system. Understanding these factors is essential for optimizing prosthetic longevity and clinical outcomes.

Purpose

This finite element analysis (FEA) study aimed to evaluate the impact of implant position, angulation, and mandibular arch form on stress and strain distribution in Novaloc overdenture attachment systems.

Materials and Methods

A computed tomography (CT) scan of an edentulous mandible was segmented using 3D Slicer software, and three mandibular arch forms (ovoid, tapered, square) were modeled in a three-dimensional FEA environment (ANSYS Workbench, ANSYS Inc.). Implants and the Novaloc attachment system were designed and integrated using ANSYS SpaceClaim software. Finite element models were generated with implant angulations of 0°, 15°, 40°, and 60°, positioned at three locations: lateral incisor region, midpoint between lateral incisor and canine, and canine region. Vertical and oblique loads were applied in the first molar region to simulate masticatory forces. Von Mises stress distribution and dislocation forces were recorded and analyzed.

Results

The highest stresses were observed in canine-positioned implants within tapered arches under 30° oblique loading. Stresses in Novaloc abutments (36.85–40.27 MPa) and inserts (13.89–15.31 MPa) approached their mechanical limits. Increasing implant angulation up to a total of 60° between implants increased stresses on the abutments while reducing stresses and displacement in the inserts. Oblique forces (30°) generated higher stresses compared to vertical and 45° oblique forces. Among mandibular arch forms, stress distribution followed the pattern: tapered > ovoid > square.

Conclusions

Anterior implant positioning in two-implant-supported overdentures resulted in more favorable stress distribution within the Novaloc attachment system. Implant angulations up to 60° had a minimal effect on stress patterns, suggesting that angulated abutments may be a viable alternative in cases with anatomical limitations. These findings provide biomechanical insights that may aid in optimizing implant placement and attachment selection in clinical practice.

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极限弯角和拱型新valoc附件的有限元分析：规范研究

由于其生物力学上的优势，带角度基牙的Novaloc附着系统在双种植体支持的下颌覆盖义齿中得到了广泛的应用。然而，关于种植体位置、角度和弓形如何影响附着系统内应力和应变分布的数据有限。了解这些因素对于优化假肢寿命和临床结果至关重要。目的通过有限元分析（FEA）研究种植体位置、角度和下颌弓形态对Novaloc覆盖义齿附着体应力应变分布的影响。材料与方法采用3D Slicer软件对无牙下颌骨进行CT扫描，并在三维有限元分析环境（ANSYS Workbench, ANSYS Inc.）中对三种下颌弓形态（卵形、锥形、方形）进行建模。利用ANSYS spacecclaim软件对植入物和Novaloc附着系统进行了设计和集成。生成种植体角度为0°、15°、40°、60°的有限元模型，分别定位于侧切牙区、侧切牙与犬齿中点、犬齿区三个位置。在第一磨牙区施加垂直和斜向载荷来模拟咀嚼力。记录并分析了Von Mises应力分布和位错力。结果在30°斜向载荷下，犬位种植体在锥形弓内的应力最大。Novaloc基台（36.85 ~ 40.27 MPa）和镶块（13.89 ~ 15.31 MPa）的应力接近其力学极限。将种植体的角度增加到种植体之间总共60°，增加了基台的应力，同时减少了植入物的应力和位移。与垂直和45°倾斜力相比，倾斜力（30°）产生更高的应力。在不同的下颌弓形态中，应力分布呈锥形>；卵形>；方形。结论双种植覆盖义齿采用前位种植体定位时，Novaloc附着体系统内的应力分布更有利。种植体成角达60°对应力模式的影响最小，这表明成角基牙可能是解剖限制病例的可行选择。这些发现提供了生物力学的见解，可能有助于在临床实践中优化种植体的放置和附着体的选择。

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

Clinical Implant Dentistry and Related Research 医学-牙科与口腔外科

CiteScore

6.00

自引率

13.90%

发文量

103

审稿时长

4-8 weeks

期刊介绍： The goal of Clinical Implant Dentistry and Related Research is to advance the scientific and technical aspects relating to dental implants and related scientific subjects. Dissemination of new and evolving information related to dental implants and the related science is the primary goal of our journal. The range of topics covered by the journals will include but be not limited to: New scientific developments relating to bone Implant surfaces and their relationship to the surrounding tissues Computer aided implant designs Computer aided prosthetic designs Immediate implant loading Immediate implant placement Materials relating to bone induction and conduction New surgical methods relating to implant placement New materials and methods relating to implant restorations Methods for determining implant stability A primary focus of the journal is publication of evidenced based articles evaluating to new dental implants, techniques and multicenter studies evaluating these treatments. In addition basic science research relating to wound healing and osseointegration will be an important focus for the journal.