Splinted and Nonsplinted Crowns with Different Implant Lengths in the Posterior Maxilla by Three-Dimensional Finite Element Analysis

Lemos, Caa; Verri, Fellippo Ramos; Santiago, Joel Ferreira; Batista, Victor Eduardo de Souza; Kemmoku, Daniel Takanori; Noritomi, Pedro Yoshito; Pellizzer, Eduardo Piza

doi:10.1155/2018/3163096

Cited by 27 publications

(41 citation statements)

References 29 publications

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“…This suggests that the overloading risk associated with NDIs under splinting conditions, specifically when connected by a dental bridge consisting of few dental units, as a FEA study already reported [15], would be comparable to that around RDIs. With this outcome, the capabilities of NDIs, which in FEA studies perform well for the replacement of single upper and lower second premolars, are extended [33].…”

Section: Discussionmentioning

confidence: 59%

“…Although splinted mini-implants (1.8 mm in diameter) compared with single miniimplants clinically show a similar bone loss [14], splinting of implants reduces the tensile stress in the posterior area of short fixed bridges [15]. Accordingly, the present study used FEA to determine whether the risks associated with NDIs could be decreased to a significant degree by the load-sharing effect resulting from the splinting concept.…”

Section: Introductionmentioning

confidence: 96%

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Finite element analysis of narrow dental implants

et al. 2020

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We resubmit the manuscript entitled "FINITE ELEMENT ANALYSIS OF NARROW DENTAL IMPLANTS" (DENTA-19-00040) after addressing your request of a major revision. We have addressed all the comments of the reviewers, which helped us to improve the manuscript. Below you will find our answers to the comments. All changes are highlighted in yellow in the final manuscript. Figures 3 and 4 have been modified as well to comply with comment 7.Comment 1: Results. The authors described that "The reason for distinguishing between minimum and maximum principal stress is to see the difference between compressive and tensile stress patterns respectively." However, the positive values of maximum/minimum principal stress mean tensile stress. The negative values of maximum/minimum principal stress mean compressive stress. Revise all related points. Answer 1: We thank you for your constructive recommendations to improve the quality of our work. Indeed, the sentence was not strictly correct since it is true that positive values of principal stress mean tension and negative ones mean compression. In the new version of the manuscript we have solved this ambiguity with a more precise sentence: "The reason for distinguishing between minimum and maximum principal stress is to identify the areas where overloading occurs due to either compressive or tensile stress, respectively, according to the maximum normal stress criterion defined above". In fact, based on this stress criterion used for brittle materials, overloading of bone occurs when the maximum principal stress exceeds its tensile strength or when the minimum principal stress exceeds its compressive strength.Comment 2: Discussion. References in the Discussion section is not enough. Ex. The last sentence in the first paragraph should be referred similar studies.Answer 2: Thanks for this observation. In the new manuscript, we have included more references supporting our discussion. Comment 3: Some results such as "3.0mm =2.20 mm³" were described in the Discussion section. These results must be moved to the Results section. Make sure and revise all related points. Answer 3: We included those data in the Discussion section since they give rise to a particular analysis from the general data provided in the Figure 3 (Results section). In any case, it is true they fit better in the Results section. We have moved this and other numerical data to the Results section while keeping their interpretation in the Discussion section. Comment 4: Also, what's the meaning of OV? Define it.Answer 4: Overloading is a major trigger for the damage and resorption of peri-implant bone. OV means overloaded volume and is related to the stress criterion we have considered to determine the areas under overloading in bone, in accordance with similar studies. It should be noted that bone can be damaged by tensile or compressive stress.Response to Reviewers (without Author Details) Answer 5: Thanks for this observation. This has been solved in the new version of the manuscript.

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Section: Discussionmentioning

confidence: 59%

Section: Introductionmentioning

confidence: 96%

Finite element analysis of narrow dental implants

et al. 2020

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“…Such restorations offer a more comfortable prosthetic approach with better emergence profiles and better oral hygiene access than other fixed partial restorations . However, a recent finite element analysis study recommends splinting of prostheses that favors better stress distribution . In a recent 3‐year prospective clinical study, short and standard implants supporting single and splinted crowns showed equal implant survival rates, peri‐implant conditions, and PBL .…”

Section: Introductionmentioning

confidence: 99%

Clinical and radiographic peri‐implant health status around narrow diameter implant‐supported single and splinted crowns

Al‐Aali

ArRejaie

Alrahlah

et al. 2019

Clin Implant Dent Rel Res

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Background Studies assessing and comparing clinical and radiographic peri‐implant status around narrow diameter implant‐supported single crowns (NDISCs) and splinted crowns (NDISPs) are scarce. Objective The aim of this retrospective study was to estimate and compare complication rates, patient satisfaction, peri‐implant status and peri‐implant bone loss (PBL) of NDISCs and NDISPs. Materials and Methods Patients receiving narrow diameter implants (NDIs) in the posterior mandible were assessed. Technical complication and patient satisfaction were recorded. Clinical peri‐implant plaque index (PI), bleeding on probing (BoP), probing depth (PD) and PBL were assessed. Technical complications and patient satisfaction were recorded. Log‐rank test was computed to evaluate the influence of prostheses type and NDIs location on technical complications. P‐value less than 0.05 was regarded as significant. Results Seventy‐eight patients (43 male and 35 females) agreed to follow up. The mean follow‐up duration of the patients was 3.6 years. A total of 102 (43 NDISCs and 59 NDISPs) NDIs with moderately rough surfaces were included. No significant differences in PI, BoP, or PD were observed between NDISCs and NDISPs. The average PBL score was 1.17 (range: 0.03‐4.15) at implant level and 1.14 (range: 0.03‐4.14) at patient level. Seven implants and three patients showed peri‐implantitis. The rates of technical complication of single crowns were significantly higher than those of splinted crowns (P = 0.036). PBL was significantly higher in molar sites than those in premolar sites (P = 0.041). A total of 67 patients (85.9%) were satisfied with the esthetics of the crowns, while a total of 59 patients (75.6%) were satisfied with the function of the crowns. Conclusion NDISCs and NDISPs offer high patient satisfaction and tolerable complication rates. Peri‐implant conditions and peri‐implant bone levels were comparable around NDISCs and NDISPs. However, bone loss of implants was higher in molar sites than those implants in premolar sites.

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“…As mentioned before, these results must be interpreted with caution, since FEA cannot accurately predict the tissue response and adaptation mechanisms. Other studies suggest that different implant lengths are not relevant when evaluating the stress transmitted to the surrounding bone, if axial forces are applied [21,22]. The increased implant length translates into increased insertion torque value, higher Periotest values and theoretically significantly affected bone-to-implant contact (BIC) area.…”

Section: Discussionmentioning

confidence: 99%

Principles of biomechanics in oral implantology

Manea

Bran

Dinu

et al. 2019

Medicine and Pharmacy Reports

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Background and aims. The principles of biomechanics comprise all the interactions between the body (tissues) and the forces acting upon it (directly or via different medical devices). Besides the mechanical aspects, the tissues response is also studied. Understanding and applying these principles is vital for the researchers in the field of oral implantology, but they must be equally known by the practitioners. From the planning stages to the final prosthetic restoration, they are involved in each and every aspect. Ignoring them inevitably leads to failure.Methods. The first part of this paper includes a review of our current research in oral implantology (mechanical, digital and biological testing), while the second part includes a review of the available literature on certain biomechanical aspects and their implications in everyday practice.Results. Our research opens new study directions and provides increased chances of success for dental implant therapy. The practical aspects of our findings, combined with the available literature (from the basic principles described more than 40 years ago to the most recent studies and technologies) can serve as a guide to practitioners for increasing their success rate. Conclusion.While no therapy is without failure risk, a good understanding of the biomechanics involved in oral implantology can lead to higher success rates in implant supported prosthetic restorations.

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Splinted and Nonsplinted Crowns with Different Implant Lengths in the Posterior Maxilla by Three-Dimensional Finite Element Analysis

Cited by 27 publications

References 29 publications

Finite element analysis of narrow dental implants

Finite element analysis of narrow dental implants

Clinical and radiographic peri‐implant health status around narrow diameter implant‐supported single and splinted crowns

Principles of biomechanics in oral implantology

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