Comparative stress analysis of delayed and immediate loading of a single implant in an edentulous maxilla model

Gao, Jie; Matsushita, Yasuyuki; Esaki, Daisuke; Matsuzaki, Tatsuya; Koyano, Kiyoshi

doi:10.1177/1758736014533982

Cited by 7 publications

(4 citation statements)

References 14 publications

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“…A major advantage of this program is that the 3D FE model can be moved and parts can be added or deleted at will comparatively easily. This functionality means that MF has wide applicability, not just in the field of research but also in clinical practice [ 23 , 24 ]. Further, the program can calculate the shape and material property data needed to assess bone strength [ 15 , 19 ] from 3D X-ray CT scans, so that highly reliable results can be obtained.…”

Section: Discussionmentioning

confidence: 99%

The Effect of Implant Length and Diameter on Stress Distribution around Single Implant Placement in 3D Posterior Mandibular FE Model Directly Constructed Form In Vivo CT

et al. 2021

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A three-dimensional (3D) finite element (FE) model of the mandibular bone was created from 3D X-ray CT scan images of a live human subject. Simulating the clinical situation of implant therapy at the mandibular first molar, virtual extraction of the tooth was performed at the 3D FE mandibular model, and 12 different implant diameters and lengths were virtually inserted in order to carry out a mechanical analysis. (1) High stress concentration was found at the surfaces of the buccal and lingual peri-implant bone adjacent to the sides of the neck in all the implants. (2) The greatest stress value was approximately 6.0 MPa with implant diameter of 3.8 mm, approx. 4.5 MPa with implant diameter of 4.3 mm, and approx. 3.2 MPa with implant diameter of 6.0 mm. (3) The stress on the peri-implant bone was found to decrease with increasing length and mainly in diameter of the implant.

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Section: Discussionmentioning

confidence: 99%

The Effect of Implant Length and Diameter on Stress Distribution around Single Implant Placement in 3D Posterior Mandibular FE Model Directly Constructed Form In Vivo CT

et al. 2021

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“…1 This technique eliminates the necessity to wait during a healing time, permits the use of a provisional prosthesis after the implant insertion, and keeps the implants in function during healing.…”

Section: Introductionmentioning

confidence: 99%

“…The stress levels around implants used in immediate loading are dramatically higher than for delayed loading. 1 Considering that all implants are available to support a denture, the presence of overload conditions can compromise the overall osseointegration process. Therefore, the best adaptation between the implant and the prosthesis is always clinically desirable.…”

Section: Introductionmentioning

confidence: 99%

Stress on external hexagon and Morse taper implants submitted to immediate loading

Odo

Pimentel

Mesquita

et al. 2015

Journal of Oral Biology and Craniofacial Research

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a b s t r a c tBackground/Aims: This study aimed to evaluate the stress distribution around external hexagon (EH) and Morse taper (MT) implants with different prosthetic systems of immediate loading (distal bar (DB), casting technique (CT), and laser welding (LW)) by using photoelastic method. Methods: Three infrastructures were manufactured on a model simulating an edentulous lower jaw. All models were composed by five implants (4.1 mm Â 13.0 mm) simulating a conventional lower protocol. The samples were divided into six groups. G1: EH implants with DB and acrylic resin; G2: EH implants with titanium infrastructure CT; G3: EH implants with titanium infrastructure attached using LW; G4: MT implants with DB and acrylic resin; G5:MT implants with titanium infrastructure CT; G6: MT implants with titanium infrastructure attached using LW. After the infrastructures construction, the photoelastic models were manufactured and a loading of 4.9 N was applied in the cantilever. Five pre-determined points were analyzed by Fringes software. Results: Data showed significant differences between the connection types ( p < 0.0001), and there was no significant difference among the techniques used for infrastructure. Conclusion: The reduction of the stress levels was more influenced by MT connection (except for CT). Different bar types submitted to immediate loading not influenced stress concentration.

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“…However, there is no evidence about whether immediate loading causes increased failure rates of short implants. Biomechanical finite element analysis revealed that an increased implant length caused a decrease in bone stresses in immediate loading models, which indicated that short dental implants under immediate loading will suffer from higher bone stresses, and this may affect the failure rates and the marginal bone level change 27 . Despite growth in the number of studies on these problems, the sample size of related studies is limited, and the findings of these studies are not completely consistent 28,29 …”

mentioning

confidence: 99%

Failure Risk of Short Dental Implants Under Immediate Loading: A Meta‐Analysis

Shi

Huang

et al. 2021

Journal of Prosthodontics

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Purpose: Currently, there is no clear clinical evidence that short implants are suitable for immediate loading. Therefore, this meta-analysis aims to evaluate whether immediate loading increases the failure risk of short dental implants. Materials and Methods: This meta-analysis was registered at PROSPERO (CRD 42020195890). PubMed, Embase, and Cochrane Library databases were searched to collect all clinical studies comparing the failure rates of short dental implants (<10 mm) and standard implants (≥10 mm) under the condition of immediate loading and studies comparing the failure rates of short dental implants under immediate loading versus early or delayed loading. All of the clinical studies with available relevant data were eligible for inclusion. The Cochrane Risk of Bias tool was adopted to evaluate the risk of bias for the randomized controlled trial (RCT), while Newcastle-Ottawa Quality Assessment Scale (NOS) was used for the observational studies (OS). The OR value of each included study and its 95% CI were pooled to estimate the failure risk of short dental implants under immediate loading. The heterogeneity among studies was evaluated through Cochran's Q test and I 2 . Results: Seventeen studies, 5 RCTs and 12 OS studies, with a total of 2461 dental implants were analyzed. Four of the RCT studies were of low risk of bias and one was of unclear risk, while all of the OS studies were of moderate or high quality. Compared with standard implants, short implants did not have an increased failure risk under immediate loading (OR: 1.38, 95% CI: 0.67-2.84, p = 0.997, fixed model). In addition, the OR value of implant failure for short implants under immediate loading compared to that for short implants under early or delayed loading was 1.22 (95% CI: 0.33-4.55, p = 0.104, random model), which was also not significantly different. Conclusions: There is not enough evidence to show that short dental implants under immediate loading may have higher implant failure risk compared to standard implants under immediate loading and short implants under early or delayed loading. Therefore, an immediate loading protocol may not increase the failure risk of short dental implants.

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Comparative stress analysis of delayed and immediate loading of a single implant in an edentulous maxilla model

Cited by 7 publications

References 14 publications

The Effect of Implant Length and Diameter on Stress Distribution around Single Implant Placement in 3D Posterior Mandibular FE Model Directly Constructed Form In Vivo CT

The Effect of Implant Length and Diameter on Stress Distribution around Single Implant Placement in 3D Posterior Mandibular FE Model Directly Constructed Form In Vivo CT

Stress on external hexagon and Morse taper implants submitted to immediate loading

Failure Risk of Short Dental Implants Under Immediate Loading: A Meta‐Analysis

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