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CompletedNCT03958448Updated May 22, 2019

Comparison of Extra-short (4 mm) Implants Used as Distal Support of a Maxillary Full-arch Fixed Dental Prosthesis vs. 10 mm Implants Installed After Sinus Floor Elevation.

An interventional study of Placement of extra short implants and maxillary sinus lift, maxillary sinus elevation, maxillary sinus augmentation in Alveolar Bone Loss, sponsored by ARDEC Academy. Completed. Open to participants aged 18 Years to 75 Years, including healthy volunteers. Per ClinicalTrials.gov, last updated 2019-05-22.

Sponsored by ARDEC Academy · Not applicable, Interventional, and Treatment

From the registry’s dates

  • Registered 3 years 7 months after the study started (first participant enrolled Oct 2015, registered May 2019).
Phase
Not applicable
Study type
Interventional
Enrollment
20
Allocation
Randomized
Ages
18 Years to 75 Years
Sex
All
01

Study summary

Recently, 4 mm long implants with a standard diameter have been used for the restoration of the posterior edentulous mandible with favorable results. However, randomized clinical trials reporting the results from full-arch fixed dental prosthesis that included 4 mm long implants placed in the posterior regions of the maxilla have not been published yet. The aim of the present study will be to compare the survival and success rates of 4 mm implants used as distal support of a maxillary full-arch fixed dental prosthesis with standard (10 mm) implants placed in association with a bilateral sinus floor augmentation procedure

Read the detailed description

Two groups will be randomly prepared, the Short group and the Standard group. In the Short group, one 4 mm long and 4.1 mm in diameter implant (extra-short implant) will be installed in each side of the posterior region of the maxilla. In the Standard group, bilateral sinus floor elevations will be performed. After 4 months of healing, one 10 mm long and 4.1 mm in diameter implant (standard implant) will be installed into each augmented sinus. In the frontal region, four 10 mm long implants will be installed in both groups. Clinical assessments and x-rays will be taken at prosthesis delivering (6-8 weeks after implant installation), and after 6, 12, 18 and 24 months.

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Conditions studied

  • Alveolar Bone Loss

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03

In context

Alveolar Bone Loss

297 studies on the registry are indexed under Alveolar Bone Loss; 76 are open to participants now.

This study's enrollment of 20 is below the median of 25 across 254 interventional studies indexed under Alveolar Bone Loss.

Browse Alveolar Bone Loss studies →

Lead sponsor

ARDEC Academy is the lead sponsor of 9 studies on the registry; none are open to participants now.

Counted across the registry records on this site, refreshed daily.

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Who can participate

Ages eligible
18 Years to 75 Years
Sexes eligible
All
Accepts healthy volunteers
Yes

Inclusion criteria

  • Edentulous maxilla
  • Willing to receive a full arch fixed restoration in the maxilla.
  • Latest extraction at least 8 weeks before implant insertion
  • Sinus floor height included between 4 to 6 mm
  • Bone width in the distal segments sufficient to allow the insertion of a 4 mm long implant of standard diameter.
  • In the anterior maxilla (from first premolar to first premolar) bone width sufficient to allow the insertion of 10 mm long implants of standard diameter. Minor horizontal augmentations with guided bone regeneration procedures was allowed in the anterior maxilla.

the opposing arch have to present one of the following conditions:

  • natural dentition (at least 10 elements from 3.5 to 4.5)
  • Fixed dental prosthesis of at least 10 elements (from 3.5 to 4.5) supported by teeth or implants
  • Implant supported or teeth supported overdentures
  • Adequate partial removable prostheses.

Exclusion criteria

Exclusion Criteria:

  • Presence of conditions requiring prophylactic use of antibiotics (e.g., history of rheumatic heart disease, bacterial endocarditis, cardiac valvular anomalies, prosthetic joint replacements).
  • Major systemic diseases, or medical conditions requiring prolonged use of steroids, or alcoholism or chronically drug abuse.
  • Current pregnancy or breastfeeding women
  • Smokers > 10 cigarettes per day
  • Physical handicaps that would interfere with the ability to perform adequate oral hygiene
  • Immunocompromised patients including patients infected with HIV
  • Conditions or circumstances, in the opinion of the investigator, which would prevent completion of study participation or interfere with analysis of study results, such as history of non-compliance, or unreliability.
  • Patients with an ongoing or previous treatment with bisphosphonates (for at least 2 months for oral therapy or 6 months for IV injection)

Local exclusion criteria

  • Local inflammation, including untreated periodontitis
  • Pre-cancerous oral lesions
  • History of local irradiation therapy
  • Severe bruxism or clenching habits
  • Patients with inadequate oral hygiene or unmotivated for adequate oral home care
  • Previous Guided bone regeneration or Guided tissue regeneration treatment at the implant site
  • Total removable prosthesis in the lower arch
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Study design

Phase
Not applicable
Primary purpose
Treatment
Allocation
Randomized
Intervention model
Parallel assignment
Masking
Triple (Care provider, Investigator, Outcomes assessor)
Enrollment
20 participants (actual)

Study arms

  • Experimental
    Short Group

    In each side of the posterior region of the maxilla, one tissue level implant, 4 mm long and 4.1 mm in diameter, will be installed

    Procedure: Placement of extra short implants

  • Experimental
    Standard group

    sinus floor elevation with will be performed using natural bovine bone graft as filler material and porcine dermis collagen membrane to cover the antrostomy. After 4 months of healing, one bone level implant, 10 mm long and 4.1 mm in diameter, will be installed into each augmented sinus.

    Procedure: maxillary sinus lift, maxillary sinus elevation, maxillary sinus augmentation · Procedure: placement of standard implant

Interventions

  • ProcedurePlacement of extra short implants

    placement of an extra short implant in the posterior edentulous ridge

  • Proceduremaxillary sinus lift, maxillary sinus elevation, maxillary sinus augmentation
  • Procedureplacement of standard implant

    placement of standard implant in the posterior edentulous ridge after maxillary sinus augmentation

06

What researchers measure

Primary outcomes

  1. survival rate of 4 mm implants used as distal support

    To compare the survival rates of 4 mm implants used as distal support of a maxillary full-arch fixed dental prosthesis with standard (10 mm) implants placed in association with a bilateral sinus floor augmentation procedure.

    Time frame: 24 months

  2. Crestal bone level

    Change of crestal bone level measured on intraoral x-ray applying a parallel technique from baseline (definitive prosthesis delivering) and 2-year follow-up. The distance between the implant margin and the first bone to implant contact will be measured in millimeters at the mesial and distal aspects of the Short and Standard implants.

    Time frame: 24 months

Secondary outcomes

  1. Technical complications

    Any technical complications related to implants, abutments, screw loosening, prosthetic fracture or chipping of the veneer material expressed in number of occurrence.

    Time frame: 24 months

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Study locations

No study locations are listed for this record.

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References and documents

Publications

  • Pjetursson BE, Tan WC, Zwahlen M, Lang NP. A systematic review of the success of sinus floor elevation and survival of implants inserted in combination with sinus floor elevation. J Clin Periodontol. 2008 Sep;35(8 Suppl):216-40. doi: 10.1111/j.1600-051X.2008.01272.x. PubMed 18724852 ↗
  • Barone A, Ricci M, Grassi RF, Nannmark U, Quaranta A, Covani U. A 6-month histological analysis on maxillary sinus augmentation with and without use of collagen membranes over the osteotomy window: randomized clinical trial. Clin Oral Implants Res. 2013 Jan;24(1):1-6. doi: 10.1111/j.1600-0501.2011.02340.x. Epub 2011 Dec 12. PubMed 22151577 ↗
  • Masuda K, Silva ER, Botticelli D, Apaza Alccayhuaman KA, Xavier SP. Antrostomy Preparation for Maxillary Sinus Floor Augmentation Using Drills or a Sonic Instrument: A Microcomputed Tomography and Histomorphometric Study in Rabbits. Int J Oral Maxillofac Implants. 2019 July/August;34(4):819-827. doi: 10.11607/jomi.7350. Epub 2019 Feb 15. PubMed 30768660 ↗
  • Lundgren S, Andersson S, Gualini F, Sennerby L. Bone reformation with sinus membrane elevation: a new surgical technique for maxillary sinus floor augmentation. Clin Implant Dent Relat Res. 2004;6(3):165-73. PubMed 15726851 ↗
  • Cricchio G, Sennerby L, Lundgren S. Sinus bone formation and implant survival after sinus membrane elevation and implant placement: a 1- to 6-year follow-up study. Clin Oral Implants Res. 2011 Oct;22(10):1200-1212. doi: 10.1111/j.1600-0501.2010.02096.x. PubMed 21906186 ↗
  • Moon YS, Sohn DS, Moon JW, Lee JH, Park IS, Lee JK. Comparative histomorphometric analysis of maxillary sinus augmentation with absorbable collagen membrane and osteoinductive replaceable bony window in rabbits. Implant Dent. 2014 Feb;23(1):29-36. doi: 10.1097/ID.0000000000000031. PubMed 24445918 ↗
  • Omori Y, Ricardo Silva E, Botticelli D, Apaza Alccayhuaman KA, Lang NP, Xavier SP. Reposition of the bone plate over the antrostomy in maxillary sinus augmentation: A histomorphometric study in rabbits. Clin Oral Implants Res. 2018 Aug;29(8):821-834. doi: 10.1111/clr.13292. Epub 2018 Jun 7. PubMed 29876969 ↗
  • Corbella S, Taschieri S, Weinstein R, Del Fabbro M. Histomorphometric outcomes after lateral sinus floor elevation procedure: a systematic review of the literature and meta-analysis. Clin Oral Implants Res. 2016 Sep;27(9):1106-22. doi: 10.1111/clr.12702. Epub 2015 Oct 10. PubMed 26452326 ↗
  • Caneva M, Lang NP, Garcia Rangel IJ, Ferreira S, Caneva M, De Santis E, Botticelli D. Sinus mucosa elevation using Bio-Oss(R) or Gingistat(R) collagen sponge: an experimental study in rabbits. Clin Oral Implants Res. 2017 Jul;28(7):e21-e30. doi: 10.1111/clr.12850. Epub 2016 Apr 15. PubMed 27080163 ↗
  • De Santis E, Lang NP, Ferreira S, Rangel Garcia I Jr, Caneva M, Botticelli D. Healing at implants installed concurrently to maxillary sinus floor elevation with Bio-Oss(R) or autologous bone grafts. A histo-morphometric study in rabbits. Clin Oral Implants Res. 2017 May;28(5):503-511. doi: 10.1111/clr.12825. Epub 2016 Mar 10. PubMed 26969193 ↗
  • Riachi F, Naaman N, Tabarani C, Aboelsaad N, Aboushelib MN, Berberi A, Salameh Z. Influence of material properties on rate of resorption of two bone graft materials after sinus lift using radiographic assessment. Int J Dent. 2012;2012:737262. doi: 10.1155/2012/737262. Epub 2012 Jul 31. PubMed 22899930 ↗
  • Shanbhag S, Shanbhag V, Stavropoulos A. Volume changes of maxillary sinus augmentations over time: a systematic review. Int J Oral Maxillofac Implants. 2014 Jul-Aug;29(4):881-92. doi: 10.11607/jomi.3472. PubMed 25032768 ↗
  • Zijderveld SA, van den Bergh JP, Schulten EA, ten Bruggenkate CM. Anatomical and surgical findings and complications in 100 consecutive maxillary sinus floor elevation procedures. J Oral Maxillofac Surg. 2008 Jul;66(7):1426-38. doi: 10.1016/j.joms.2008.01.027. PubMed 18571027 ↗

Study documents

  • Protocol and statistical analysis plan · Jan 18, 2017

Documents are hosted by the registry — open the source record to download them.

Individual participant data

Plan to share: No

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Updates

Tracking since Sep 25, 2026
No changes since tracking began. The registry record was last updated on May 22, 2019, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
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Registry details

Key details

Study ID
NCT03958448
Lead sponsor
ARDEC Academy
Collaborators
University of Bologna, ITI International Team for Implantology, Switzerland
Responsible party
Sponsor
First posted
May 22, 2019
Start date
Oct 1, 2015
Primary completion
Dec 2, 2018
Completion
Apr 2, 2019
Last update
May 22, 2019

Oversight

Data monitoring committee
Yes
FDA-regulated drug
No
FDA-regulated device
No
View the source record on ClinicalTrials.gov ↗

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