Retrospective Study of Short and Extra-Short Implants Placed in Posterior Regions: Influence of Crown-to-Implant Ratio on Marginal Bone Loss

The aim of this retrospective study was to evaluate implant survival, marginal bone loss and peri-implant complications in 326 short and ultra-short implants. Implants were placed in the maxillary and mandibular posterior regions of 140 patients with (PP) and without (NPP) a history of periodontal disease. Clinical and radiographic examinations were performed at 3-year recall appointments. The 8.0, 6.0 and 5.0 mm-length implants placed in PP and NPP were respectively 43.75% and 38.46%, 35.10% and 34.19%, 21.15% and 27.35%; 325 implants (one early failure) were rehabilitated with single crowns in 139 patients. Overall implant survival after 3 years of follow-up was 97.55%, 98.08% and 96.61% for PP and NPP (p = 0.46). Crestal bone level variations were not statistically different among PP and NPP; 15.41% of implants presented signs of mucositis, 14.71% and 16.67% in PP and NPP (p = 0.64). Setting the threshold for bone loss at 2 mm after 36 months, peri-implantitis prevalence was 2.2%, 1.96% and 2.63% in PP and NPP (p = 0.7). Overall implant success was 82.39%, 83.33% and 80.7% for PP and NPP (p = 0.55). Short-term outcomes suggest that short and ultra-short locking-taper implants can successfully be restored with single crowns in the posterior jaws both in PP and NPP.

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Survival of Short and Ultra-Short Locking-Taper Implants Supporting Single Crowns in the Posterior Mandible: A 3-Year Retrospective Study

Journal of Oral Implantology ◽

10.1563/aaid-joi-d-19-00190 ◽

2020 ◽

Vol 46 (4) ◽

pp. 396-406 ◽

Cited By ~ 2

Author(s):

Giorgio Lombardo ◽

Annarita Signoriello ◽

Miguel Simancas-Pallares ◽

Mauro Marincola ◽

Pier Francesco Nocini

Keyword(s):

Retrospective Study ◽

Bone Loss ◽

Contact Point ◽

Implant Survival ◽

Point Position ◽

Crestal Bone Loss ◽

Short Implants ◽

Single Crown ◽

Bone To Implant Contact ◽

Single Crowns

The purpose of this retrospective study was to determine survival and peri-implant marginal bone loss of short and ultra-short implants placed in the posterior mandible. A total of 98 patients received 201 locking-taper implants between January 2014 and January 2015. Implants were placed with a 2-stage approach and restored with single crowns. Clinical and radiographic examinations were performed at 3-year recall appointments. At that time, the proportion of implant survival by length, and variations of crestal bone levels (mean crestal bone loss and mean apical shift of the “first bone-to-implant contact point” position) were assessed. Significance level was set at 0.05. The total number of implants examined 36 months after loading included: 71 implants, 8.0 mm in length; 82 implants, 6.0 mm in length; and 48 implants, 5.0 mm in length. Five implants failed. The overall proportion of survival was 97.51%, with 98.59% for the 8.0-mm implants, 97.56% for the 6.0-mm implants, and 95.83% for the 5.0-mm implants. No statistically significant differences were found among the groups regarding implant survival (P = .73), mean crestal bone loss (P = .31), or mean apical shift of the “first bone-to-implant contact point” position (P = .36). Single-crown short and ultra-short implants may offer predictable outcomes in the atrophic posterior mandibular regions, though further investigations with longer follow-up evaluations are necessary to validate our results.

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Prosthetic complications of fixed dental prostheses supported by locking-taper implants: A retrospective study with a mean follow-up of 5 years.

10.21203/rs.3.rs-228445/v1 ◽

2021 ◽

Author(s):

Wen Mo Gao ◽

Wei Geng ◽

Chen Chen Luo

Keyword(s):

Retrospective Study ◽

Bone Loss ◽

Regression Model ◽

Protective Factor ◽

Cox Regression ◽

Marginal Bone Loss ◽

Cox Regression Model ◽

Prosthetic Complications ◽

Free Rate

Abstract Background: Restoration with locking-taper implants is a widely used methodology. However, relatively few have examined conical connection systems like locking-taper implant systems. This study provides a retrospective study of locking-taper fixed restorations, mainly focused on prosthetic complications.Methods: All patients who underwent conical connected implants from 2008–2010 were examined. Preparation of the implant sites was performed according to the standard procedures for the Bicon system. The bone healing took over 6 months, and the prosthetic procedure was initiated thereafter. Integrated abutment crowns or gold porcelain crowns were used, and the prosthesis type was a single crown or a fixed dental prosthesis. Once the crown was in place, its occlusion was thoroughly checked and adjusted, and then the crown was glazed or finely polished. The Kaplan-Meier method was used to calculate the cumulative complication-free rates for 5 and 10 years. Additionally, a Cox regression model was used to identify the factors that independently influenced the results. Implant survival and marginal bone loss were also investigated.Results: A total of 392 patients who underwent 541 implants and 434 locking taper implant-based restorations from 2008–2010 were examined. The overall 5-year cumulative complication-free rate was 83.34%. The most common prosthetic complication was veneer chipping, with a frequency of 67.53%. According to the Cox regression model, the complication-free rate of integrated abutment crowns was significantly higher than gold porcelain crowns, molar regions was significantly higher than premolar regions, and females was significantly higher than males. Only three implant failures happened, and a mean marginal bone loss at 1- year, 5-year and 10- year was 0.25mm（95%CI：±0.12）, 0.40mm （95%CI：±0.03）and 0.51mm（95%CI：±0.05）, respectively.Conclusion: Veneer chipping was the most common complication with locking-taper implants supported fixed restorations. According to the result of Cox regression model, gold porcelain crowns are a protective factor relative to integrated abutment crowns, male sex is a protective factor relative to female sex, and premolar prosthetics are a protective factor relative to molar prosthetics. The long-term clinical effect of locking-taper implant is stable, and the implant success rate can meet the clinical needs. The bone tissue level around the implant can maintain long-term stability.

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Clinical outcomes of dental implants placed in the same region where previous implants failed due to peri-implantitis: a retrospective study

International Journal of Implant Dentistry ◽

10.1186/s40729-021-00392-1 ◽

2021 ◽

Vol 7 (1) ◽

Author(s):

Eduardo Anitua ◽

Adriana Montalvillo ◽

Asier Eguia ◽

Mohammad Hamdan Alkhraisat

Keyword(s):

Retrospective Study ◽

Survival Rate ◽

Bone Loss ◽

Clinical Outcomes ◽

Dental Implants ◽

Demographic Data ◽

High Survival ◽

Implant Survival ◽

Marginal Bone Loss ◽

Bone Level

Abstract Purpose There is paucity in the studies that assess dental implants replacing failed dental implants due to peri-implantitis. This study aims to evaluate the clinical outcomes of these implants in terms of implant survival and marginal bone loss. Methods Patients in this retrospective study were selected if having one or more implants removed due to peri-implantitis and the placement and loading of dental implants in the same region from April 2010 to December 2019. Information was collected about the patient's demographic data, implant dimensions, surgical and prosthetic variables. Changes in peri-implant bone level, cumulative implant survival rate and technical complications were assessed. Results Three hundred and eighty one dental implants in 146 patients that were placed in the same position or one-tooth position mesially/distally to the site of explantation were included. The patients' mean age was 63 ± 10 years. Ninety seven patients were females and 49 were males. After a mean follow-up of 34 ± 17 months, two implants failed. The cumulative survival rate was 99%. The marginal bone loss was −0.1 ± 0.6. Immediate or delay replacement of the failed implant did not affect implant survival or marginal bone stability. All the prostheses were screw-retained and presented the following complications: ceramic chipping (3 events), resin tooth fracture (1 event) and prosthetic screw loosening (1 event). Conclusions Dental implants replacing failed implants due to peri-implantitis would be an option in the management of peri-implantitis. They showed high survival rate and marginal bone stability.

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Factors influencing marginal bone loss at a hydrophilic implant design placed with or without GBR procedures: A 5‐year retrospective study

Clinical Oral Implants Research ◽

10.1111/clr.304_13509 ◽

2019 ◽

Vol 30 (S19) ◽

pp. 348-348

Author(s):

Silvio Schütz ◽

Thomas Zumstein ◽

Lars Sennerby

Keyword(s):

Retrospective Study ◽

Bone Loss ◽

Implant Design ◽

Marginal Bone Loss ◽

Factors Influencing

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Influence of crown-to-implant ratio on periimplant marginal bone loss in the posterior region: a five-year retrospective study

Journal of Periodontal & Implant Science ◽

10.5051/jpis.2012.42.6.231 ◽

2012 ◽

Vol 42 (6) ◽

pp. 231 ◽

Cited By ~ 16

Author(s):

Kyung-Jin Lee ◽

Yong-Gun Kim ◽

Jin-Woo Park ◽

Jae-Mok Lee ◽

Jo-Young Suh

Keyword(s):

Retrospective Study ◽

Bone Loss ◽

Posterior Region ◽

Marginal Bone Loss

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Short Dental Implants (≤7mm) Versus Longer Implants in Augmented Bone Area: A Meta-Analysis of Randomized Controlled Trials

The Open Dentistry Journal ◽

10.2174/1874210601812010354 ◽

2018 ◽

Vol 12 (1) ◽

pp. 354-365 ◽

Cited By ~ 7

Author(s):

Priscila N. Uehara ◽

Victor Haruo Matsubara ◽

Fernando Igai ◽

Newton Sesma ◽

Marcio K. Mukai ◽

...

Keyword(s):

Survival Rate ◽

Bone Loss ◽

Randomized Controlled Trials ◽

Meta Analysis ◽

Statistical Significance ◽

Controlled Trials ◽

Bone Area ◽

Marginal Bone Loss ◽

Randomized Controlled ◽

Short Implants

Aim: The aim of this systematic review was to compare the survival rate and the marginal bone loss between short implants (≤7 mm) placed in the atrophic area and longer implants placed in the augmented bone area of posterior regions of maxillaries. Methods: Electronic search using three databases was performed up to May 2017 to identify Randomized Controlled Trials (RCT) assessing short implants survival with a minimal follow-up of 12 months post-loading. For the meta-analysis, a Risk Difference (RD) with the 95% Confidence Interval (CI) was used to pool the results of implant failure rate for each treatment group. For the marginal bone changes, Mean Differences (MD) with 95% CI were calculated. Results: Seven randomized controlled trials met the inclusion criteria, being included in qualitative and quantitative analyses. The RD between the short implant group and the control group was -0.02 (95% CI: -0.04 to 0.00), I2=0 and Chi2=3.14, indicating a favorable survival rate for short implant, but with no statistical significance (p=0.09). Discussion: For marginal bone loss, the mean difference was -0,13 (95%CI: -0.22 to -0.05), favoring the test group with statistical significance (p=0.002). The studies showed more heterogeneity for bone loss compared to survival rate. Short and longer implants showed similar survival rates after one year of loading, however the marginal bone loss around short implants was lower than in longer implants sites. Conclusion: Placement of implants ≤7 mm of length was found to be a predictable alternative for the rehabilitation of atrophic posterior regions, avoiding all the disadvantages intrinsic to bone augmentation procedures.

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