Biomechanical effects of titanium alloy removable partial denture framework designs fabricated by selective laser melting in mandibular Kennedy class II partial edentulism: A finite element study.
{"title":"Biomechanical effects of titanium alloy removable partial denture framework designs fabricated by selective laser melting in mandibular Kennedy class II partial edentulism: A finite element study.","authors":"Min-Chieh Chang, Ping-Ching Wu, Wei-Shao Lin, Yung-Chung Chen","doi":"10.1016/j.jds.2025.07.3501","DOIUrl":null,"url":null,"abstract":"<p><strong>Background/purpose: </strong>The biomechanical effects of framework design and material interactions in mandibular free-end saddle removable partial dentures remain unclear. This study evaluated framework variables using finite element analysis.</p><p><strong>Materials and methods: </strong>A mandibular Kennedy Class II model was digitized to create a cobalt-chromium (CoCr) and sixteen Ti-6Al-4V (Ti64) frameworks varying by major connector dimension, clasp configuration, and lingual reciprocal assembly (LRA). Periodontal ligament (PDL) and mucosa layers were incorporated. Contacts were defined, and materials were assumed homogeneous and isotropic. Vertical and oblique loads were applied, and von Mises stresses were analyzed. Model validation was performed using digital image correlation.</p><p><strong>Results: </strong>Ti64 frameworks reduced overall stress by 21%-43% compared with CoCr. Under vertical loading, PDL stress decreased by 40% and framework stress by 32%-46%. Under oblique loading, direct retainer, PDL, and mucosal stresses increased by 3%, 6%, and 13%, respectively. Framework stress distribution was governed by clasp-LRA interaction, whereas increasing connector rigidity reduced stress magnitude and variability rather than peak stress. Supporting tissue responses were primarily determined by major connector dimension, with LRA and clasp effects being design- and loading-dependent.</p><p><strong>Conclusion: </strong>Ti64 frameworks improved load distribution with limited supporting tissue stress increases under oblique loading. Framework behavior was primarily governed by clasp-LRA interaction, while connector dimension determined supporting tissue response. Increasing major connector dimension attenuated LRA-related stress variations, particularly under oblique loading. Coordinated control of clasp configuration, LRA incorporation, and major connector dimension is required for biomechanical optimization.</p>","PeriodicalId":15583,"journal":{"name":"Journal of Dental Sciences","volume":"21 3","pages":"1469-1479"},"PeriodicalIF":3.6000,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13536343/pdf/","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Dental Sciences","FirstCategoryId":"3","ListUrlMain":"https://doi.org/10.1016/j.jds.2025.07.3501","RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"2026/1/1 0:00:00","PubModel":"eCollection","JCR":"Q1","JCRName":"DENTISTRY, ORAL SURGERY & MEDICINE","Score":null,"Total":0}
引用次数: 0
Abstract
Background/purpose: The biomechanical effects of framework design and material interactions in mandibular free-end saddle removable partial dentures remain unclear. This study evaluated framework variables using finite element analysis.
Materials and methods: A mandibular Kennedy Class II model was digitized to create a cobalt-chromium (CoCr) and sixteen Ti-6Al-4V (Ti64) frameworks varying by major connector dimension, clasp configuration, and lingual reciprocal assembly (LRA). Periodontal ligament (PDL) and mucosa layers were incorporated. Contacts were defined, and materials were assumed homogeneous and isotropic. Vertical and oblique loads were applied, and von Mises stresses were analyzed. Model validation was performed using digital image correlation.
Results: Ti64 frameworks reduced overall stress by 21%-43% compared with CoCr. Under vertical loading, PDL stress decreased by 40% and framework stress by 32%-46%. Under oblique loading, direct retainer, PDL, and mucosal stresses increased by 3%, 6%, and 13%, respectively. Framework stress distribution was governed by clasp-LRA interaction, whereas increasing connector rigidity reduced stress magnitude and variability rather than peak stress. Supporting tissue responses were primarily determined by major connector dimension, with LRA and clasp effects being design- and loading-dependent.
Conclusion: Ti64 frameworks improved load distribution with limited supporting tissue stress increases under oblique loading. Framework behavior was primarily governed by clasp-LRA interaction, while connector dimension determined supporting tissue response. Increasing major connector dimension attenuated LRA-related stress variations, particularly under oblique loading. Coordinated control of clasp configuration, LRA incorporation, and major connector dimension is required for biomechanical optimization.
期刊介绍：
he Journal of Dental Sciences (JDS), published quarterly, is the official and open access publication of the Association for Dental Sciences of the Republic of China (ADS-ROC). The precedent journal of the JDS is the Chinese Dental Journal (CDJ) which had already been covered by MEDLINE in 1988. As the CDJ continued to prove its importance in the region, the ADS-ROC decided to move to the international community by publishing an English journal. Hence, the birth of the JDS in 2006. The JDS is indexed in the SCI Expanded since 2008. It is also indexed in Scopus, and EMCare, ScienceDirect, SIIC Data Bases.
The topics covered by the JDS include all fields of basic and clinical dentistry. Some manuscripts focusing on the study of certain endemic diseases such as dental caries and periodontal diseases in particular regions of any country as well as oral pre-cancers, oral cancers, and oral submucous fibrosis related to betel nut chewing habit are also considered for publication. Besides, the JDS also publishes articles about the efficacy of a new treatment modality on oral verrucous hyperplasia or early oral squamous cell carcinoma.
求助内容：
应助结果提醒方式：
京公网安备 11010802042870号
