In vitro study of the effect of implant position and attachment type on stress distribution of implant-assisted removable partial dentures

Naing, Sai Tun; Kanazawa, Manabu; Hada, Tamaki; Iwaki, Maiko; Komagamine, Yuriko; Miyayasu, Anna; Uehara, Yoko; Minakuchi, Shunsuke

doi:10.1016/j.jds.2021.11.018

Cited by 5 publications

(13 citation statements)

References 32 publications

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“…RPA clasps (rest, proximal plate, and Akers clasps) [ 21 , 22 ], RPI clasps (rest, proximal plate, and I-bar clasp) [ 17 , 18 ], Akers clasps, and clasp-less type (rest and bracing arms only) [ 20 ], or other types of retainers [ 18 , 19 ] were used as the direct retainers. In terms of the abutment on the implant, one study used a healing abutment predominantly as support [ 20 ], whereas others used an attachment-type abutment [ 17 – 19 , 21 , 22 ]. For the loading condition, a static load was vertically applied to the occlusal surface of the IARPD at a constant crosshead speed.…”

Section: Resultsmentioning

confidence: 99%

“…Strain gauges and piezoelectric transducers were mostly used to measure the load or stress of the supporting elements in model studies. In the included studies, the strain gauges were attached directly to the implant body [18][19][20] or the resin part around the implant [21,22]. Considering the load in the peri-implant bone, the latter might be more meaningful, because the distortion of the surrounding bone can be more related to bone damage or remodeling.…”

Section: Discussionmentioning

confidence: 99%

“…Table 1 summarizes the six selected articles [17][18][19][20][21][22]. All studies employed a mandibular free-end missing model (Kennedy Class I or II) in an improved ready-made resin model.…”

Section: Experimental Condition Of the In Vitro Model Studiesmentioning

confidence: 99%

“…Twelve strain gauges (Kyowa Electronic Instruments Co, Ltd, Tokyo, Japan) were bonded on the mesial and distal surfaces of the model adjacent to the first thread region of each dental mini-implant, 1 mm away from the implant body and perpendicular to the occlusal plane Two strain gauges were bonded on the buccal surface and parallel to the long axis of the primary abutment tooth A mesially placed implant decreased microstrains around abutment teeth compared to a distally placed dental mini-implant A distally placed implant decreased microstrains around the dental mini-implant itself Naing [22] 120 N, vertical, one point (right first molar on denture), unilateral…”

Section: Experimental Condition Of the In Vitro Model Studiesmentioning

confidence: 99%

“…Kihara investigated the effect of the loading location [20]. Strain gauges [18][19][20][21][22] and piezoelectric transducers [17] were used to measure the load to the tooth, implant, and surrounding tissues or residual ridge. A seat-type sensor was used to measure the load on the mucosa under the denture base [17].…”

Section: Experimental Condition Of the In Vitro Model Studiesmentioning

confidence: 99%

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Impact of implant location on load distribution of implant-assisted removable partial dentures: a review of in vitro model and finite-element analysis studies

Ichikawa,

Yoda,

Ogawa

et al. 2023

Int J Implant Dent

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Background Appropriate load distribution among the supporting elements is essential for the long-term success of implant-assisted removable partial dentures; however, there is little information available on load distribution. Purpose This study aimed to evaluate the effect of implant location on load distribution in implant-assisted removable partial dentures by reviewing in vitro models and finite-element analysis studies. Materials and methods English-language studies which examined the load distribution of implant-assisted removable partial dentures and were published between January 2001 and October 2022 were extracted from PubMed, ScienceDirect, and Scopus online databases, and manual searching. Two reviewers selected the articles based on the predetermined inclusion and exclusion criteria, followed by data extraction and analysis. Results Forty-seven studies were selected after evaluating the titles and abstracts of 264 articles; two were identified manually. After screening the text, 12 studies were included: six in vitro model experiments and six finite-element analysis studies. All included studies used a mandibular free-end missing model (Kennedy Class I or II). The influence of implant location on load distribution to the abutment tooth, implant, and mucosa under the denture base was summarized in three cases: implant at the premolar, first molar, and second molar region. Due to differences in the measurement method of load distribution and loading condition to the denture, the results differed among the studies. Conclusions The implant location in implant-assisted removable partial dentures can affect load distribution to the supporting elements, such as the abutment tooth, implant, and mucosa under the denture base.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Experimental Condition Of the In Vitro Model Studiesmentioning

confidence: 99%

Section: Experimental Condition Of the In Vitro Model Studiesmentioning

confidence: 99%

Section: Experimental Condition Of the In Vitro Model Studiesmentioning

confidence: 99%

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Impact of implant location on load distribution of implant-assisted removable partial dentures: a review of in vitro model and finite-element analysis studies

Ichikawa,

Yoda,

Ogawa

et al. 2023

Int J Implant Dent

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Stress analysis of mandibular Kennedy class I partial overdenture submitted to different implant length and clasp designs – An in vitro study

Mahross,

Atito,

Mansour

et al. 2024

Journal of Prosthodontics

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PurposeTo analyze the distribution of stresses for mandibular Kennedy class I removable partial overdentures submitted to different implant lengths and clasp designs.Materials and MethodsTwenty‐seven heat‐cured acrylic resin casts with a uniform soft acrylic layer were constructed from models representing the mandibular Kennedy class I removable partial denture with the first premolars terminal abutment on both sides. The casts were grouped into a control group, group I, and group II with three casts of each for designing a different clasp on the last abutment with Rest, Proximal plate, Aker circumferential (RPA), Rest, Proximal plate, I‐bar (RPI), and wrought wire (WW). All casts were submitted to vertical load for stress analysis after preparing channels at the buccal/distal surface of abutments, the crest of the ridge, and the buccal/lingual of the implant for placement of uniaxial strain gauges that can convert the electro‐signals to micro‐strain by using the software. Kolmogorov–Smirnov normality test, independent t‐test, and one‐way anlysis of Variance (ANOVA) test followed by Tukey`s Post Hoc for multiple comparisons test were used for statistical analysis.ResultsThe control group results revealed more significant stresses on the ridge with RPA and RPI clasps but on the abutment with WW clasp as P < 0.05. In group I, the ridge was significantly stressed more than the implant followed by the abutment when the RPA clasp was used while there was insignificance on the implant with RPA and RPI as p > 0.05. In group II, the stresses were more on the abutment with RPA, RPI, and WW clasps followed by lower on the implant and lowest on the ridge.ConclusionsProper implant and clasp type selection are critical for stress distribution on the ridge, abutment, and implant when using removable partial overdenture. The stresses on longer implants are tolerated and more widely distributed than shorter ones.

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Incorporation of the Altered Cast Technique in the Fabrication Workflow of an Implant-Assisted Removable Partial Denture (IARPD) for an Elderly Patient

Papalexopoulos

Samartzi

Tsirogiannis

et al. 2023

Case Reports in Dentistry

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Implants are currently used to serve as abutments for implant-assisted removable partial dentures (IARPDs) to facilitate retention and support of the prosthesis. Implants are proposed in cases of posterior edentulous areas to convert Kennedy Class I or II to Class III or when the preparation of existing teeth to serve as abutments is contraindicated. The purpose of this report is to describe the protocol applied to fabricate an IARPD to restore a Kennedy Class II mandible of an elderly patient by incorporating traditional methods, such as the altered cast technique. Each step of the clinical procedure is thoroughly illustrated to document the selected appointment sequence. The patient was satisfied with the delivered prosthesis that demanded no additional implants to be placed but exploitation of an existing one. IARPDs are a viable and cost-effective solution substantiated by numerous reports with positive effects on patient satisfaction.

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In vitro study of the effect of implant position and attachment type on stress distribution of implant-assisted removable partial dentures

Cited by 5 publications

References 32 publications

Impact of implant location on load distribution of implant-assisted removable partial dentures: a review of in vitro model and finite-element analysis studies

Impact of implant location on load distribution of implant-assisted removable partial dentures: a review of in vitro model and finite-element analysis studies

Stress analysis of mandibular Kennedy class I partial overdenture submitted to different implant length and clasp designs – An in vitro study

Incorporation of the Altered Cast Technique in the Fabrication Workflow of an Implant-Assisted Removable Partial Denture (IARPD) for an Elderly Patient

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