Risk factors for single crowns supported by short (6‐mm) implants in the posterior region: A prospective clinical and radiographic study

Villarinho, Eduardo Aydos; Triches, Diego Fernandes; Alonso, Fernando Rizzo; Mezzomo, Luís André; Teixeira, Eduardo Rolim; Shinkai, Rosemary Sadami Arai

doi:10.1111/cid.12494

Cited by 31 publications

(71 citation statements)

References 24 publications

(102 reference statements)

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“…According to the established success criteria MBL should not exceed 1.5 mm after the first year of loading and not 0.2 mm in the subsequent years . Thus, a MBL of 0.71 mm and a survival rate of 97.3% is considered to be satisfactory and comparable to other studies also investigating short dental implants (Table ). Two implants in the posterior mandibular region of one patient had to be explanted after 2 months following insertion due to implant loosening as a consequence of failed osseointegration.…”

Section: Discussionsupporting

confidence: 84%

“…Peri-implant MBL plays a key role for long-term implant stability. 25,31 According to the established success criteria MBL should not exceed 32 Thus, a MBL of 0.71 mm and a survival rate of 97.3% is considered to be satisfactory and comparable to other studies also investigating short dental implants 9,12,[33][34][35][36] (Table 5) insertion results in ischemic conditions that seriously inhibit the process of osseointegration. 31,37 Consequently, complications and early implant failures are commonly described in this poor vascularized region.…”

Section: Discussionsupporting

confidence: 59%

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The influence of crown‐to‐implant ratio on marginal bone levels around splinted short dental implants: A radiological and clincial short term analysis

Hingsammer

Watzek

Pommer

2017

Clin Implant Dent Rel Res

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Background The amount of marginal bone resorption around dental implants is considered to have a significant impact on implant stability as well as implant survival rates. Purpose The aim of this prospective study was to investigate the influence of prosthetic as well as patient specific factors on marginal bone loss around short dental implants. Materials and methods Seventy‐six implants, which supported splinted crowns were included for investigation. All implants were from the same type and had an intraosseous length of 6.5 mm and a diameter of 4.0 mm. Twenty implants were additionally splinted onto longer ones. Measurements of marginal bone loss were performed at a mean of 12.38 months after prosthetic loading and the mean follow‐up for clinical evaluation was 20.52 months. Results Overall two implant failures were recorded, revealing a survival rate of 97.3%. Marginal bone resorption around 72 short implants measured 0.71 mm (SD: 0.74 mm) and was found to have a strong correlation with calculated Crown‐to‐Implant ratio (r = .71; P < .001). Age, gender, insertion torque, implant surface area, location, position, bone quality, and insertion torque did not influence peri‐implant bone loss after one year of loading. Conclusion Within the limitations of the study, it is suggested that Crown‐to‐Implant ratios should not exceed 1.7 to avoid increased early marginal bone loss.

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Section: Discussionsupporting

confidence: 84%

Section: Discussionsupporting

confidence: 59%

The influence of crown‐to‐implant ratio on marginal bone levels around splinted short dental implants: A radiological and clincial short term analysis

Hingsammer

Watzek

Pommer

2017

Clin Implant Dent Rel Res

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“…(2017) which mentioned a survival rate of 91.3% for implants as well as crowns after a follow‐up of 45 months. This percentage is rather low compared to an expected implant survival rate of more than 97% after 5 years as stated in the systematic review of Doornewaard et al.…”

Section: Discussionmentioning

confidence: 99%

“…One exception is again the study of Villarinho et al. (2017) which mentioned screw loosening being 28.3% after a follow‐up of 45 months. This is in strong contrast to other studies and can best be compared with the study of Rossi et al.…”

Section: Discussionmentioning

confidence: 99%

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Is there an effect of crown‐to‐implant ratio on implant treatment outcomes? A systematic review

Meijer

Boven

Delli

et al. 2018

Clinical Oral Implants Res

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ObjectivesHigh crown‐to‐implant ratios may lead to complications due to unfavorable occlusal forces, including nonaxial forces, on the bone surrounding the neck of the implant and within the connection of the crown and implant itself. The aim of this study was to perform a systematic review on the influence of crown‐to‐implant ratio of single‐tooth, nonsplinted, implants on biological and technical complications.Materials and Methods MEDLINE (1950–January 2018), EMBASE (1966–January 2018), and Cochrane Central Register of Controlled Trials database (1800–January 2018) were searched to identify eligible studies. Inclusion criteria were as follows: crown‐to‐implant ratio of single‐tooth, nonsplinted, implant‐supported restorations in the posterior maxilla or mandible and follow‐up of at least 1 year. Main outcome measures were as follows: implant survival rate, marginal bone level changes, biological complications, and technical complications. Two reviewers independently assessed the articles. A meta‐analysis was carried out for implant survival rate and peri‐implant bone changes.ResultsOf 154 primarily selected articles, eight studies fulfilled the inclusion criteria. Study groups presented a mean crown‐to‐implant ratio varying from 0.86 (with 10‐mm implants) to 2.14 (with 6‐mm implants). The meta‐analysis showed an implant survival of more than 99% per year and mean peri‐implant bone changes of <0.1 mm per year. Limited biological and technical complications were reported.ConclusionData reviewed in the current manuscript on crown‐to‐implant ratio, ranging from 0.86 to 2.14, of single‐tooth, nonsplinted, implants did not demonstrate a high occurrence of biological or technical complications.

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Outcomes of Short Implants in Bone Deficiency

FarrellIV

2021

Innovative Perspectives in Oral and Maxillofacial Surgery

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Risk factors for single crowns supported by short (6‐mm) implants in the posterior region: A prospective clinical and radiographic study

Abstract: The 6-mm implants supporting single crowns performed well, but the mandible shows a higher risk of failure. The time and clinical C/I ratio are predictors for bone loss.

Cited by 31 publications

References 24 publications

The influence of crown‐to‐implant ratio on marginal bone levels around splinted short dental implants: A radiological and clincial short term analysis

The influence of crown‐to‐implant ratio on marginal bone levels around splinted short dental implants: A radiological and clincial short term analysis

Is there an effect of crown‐to‐implant ratio on implant treatment outcomes? A systematic review

Outcomes of Short Implants in Bone Deficiency

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