ClinicalTrials.gg
TerminatedNCT04255342Updated Oct 3, 2024Results posted

Azento IIS 3 Year Outcomes Implant Study

An interventional study of Implant Placement and Temporary Crown using AstraTech Implant System EV, Final Crown Delivery in Tooth Loss, sponsored by Christopher Barwacz. Terminated at 1 site in United States. Open to participants aged 18 Years to 95 Years, including healthy volunteers. Per ClinicalTrials.gov, last updated 2024-10-03.

Sponsored by Christopher Barwacz · Not applicable, Interventional, and Treatment

Why this study was terminated
Sponsor and PI mutual agreement to discontinue study early due to change in statistical analysis of data.
Phase
Not applicable
Study type
Interventional
Enrollment
25
Allocation
Not applicable
Ages
18 Years to 95 Years
Sex
All
01

Study summary

The revised purpose of this study is to compare and evaluate the stability of the implant body, survival rate, bone-level changes, and the implant's soft-tissue outcomes over a period of 1 year. Only 1 tooth is studied per participant.

In July of 2024, the revised protocol and revised Statistical Analysis plan were amended post-hoc, and the revised protocol and statistical analysis plan were approved by the IRB review committee in July of 2024.

As a result, the study has been terminated due to a change in the study's data analysis, and so the study will only analyze data up to and including the 1-year point.

02

Conditions studied

  • Tooth Loss

Keywords

  • alveolar bone
  • alveolar ridge
  • bone grafting
  • bone resorption
  • dental implant
03

In context

Tooth Loss

227 studies on the registry are indexed under Tooth Loss; 49 are open to participants now.

This study's enrollment of 25 is below the median of 30 across 169 interventional studies indexed under Tooth Loss.

Browse Tooth Loss studies →

Lead sponsor

Christopher Barwacz is the lead sponsor of 4 studies on the registry; none are open to participants now.

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

04

Who can participate

Ages eligible
18 Years to 95 Years
Sexes eligible
All
Accepts healthy volunteers
Yes

Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.

Inclusion criteria

  • Subjects may identify as either male, female, or intersex
  • Age: 18 years or older
  • Subjects with a healed, single-rooted tooth (except mandibular incisors) that has previously undergone ARP-SG with particulate allograft material within the past 2 months.
  • Subjects must have stable occlusion, with absence of caries or other known acute pathology (i.e., untreated endodontic lesion, periodontal abscess, external/internal resorption, etc.) on teeth proximal to the implant site that would negatively influence implant outcomes
  • Must be in adequate physical and mental health to undergo routine dental treatment including the surgical procedures associated tooth extraction and implant placement
  • Subjects' treatment plan must include replacement of the tooth to be extracted with dental implant supported fixed restoration
  • Subjects must have read, understood and signed an informed consent form
  • Subjects must be willing to return for the required number of visits
  • Subjects' tooth must be a permanent tooth, not a primary tooth (also known as baby tooth).

Exclusion criteria

Exclusion Criteria:

  • Mandibular incisors
  • Acute infection associated with the tooth to be extracted or with adjacent teeth
  • Unstable occlusion, presence of caries or other acute pathology on teeth adjacent to the implant site
  • History of significant heart, stomach, liver, kidney, blood, immune system disease, or other organ impairment or systemic diseases that would prevent undergoing the proposed treatment or may result in compromised healing (e.g. poorly controlled diabetes, active heavy tobacco use [>10 cigs/day]), history of head/neck radiation, history of chemotherapy within the last 5 years
  • Subjects with uncontrolled and/or severe metabolic bone diseases or disorders, such as osteoporosis, thyroid disorders or Paget's disease
  • Subjects taking any medication or supplement known to largely influence bone metabolism, such as IV bisphosphonates, long-term history of oral bisphosphonates or chronic intake of glucocorticoids
  • Pregnant women or nursing mothers
  • Subjects that are unwilling or unable to sign the informed consent
  • History of lack of compliance with dental visits
  • Subjects unwilling to return for the required number of visits
  • Subject currently undergoing orthodontic treatment
05

Study design

Phase
Not applicable
Primary purpose
Treatment
Allocation
Not applicable
Intervention model
Single group
Masking
None (open label)
Enrollment
25 participants (actual)

Study arms

  • Experimental
    Implant Placement and Temporary Crown using AstraTech Implant System EV, Final Crown Delivery

    Device: Implant Placement and Temporary Crown using AstraTech Implant System EV, Final Crown Delivery

Interventions

  • DeviceImplant Placement and Temporary Crown using AstraTech Implant System EV, Final Crown Delivery

    At least 3 months after tooth removal and bone grafting, a dental implant will be placed using Azento, a commercially-available product that uses computer technology to plan the dental implant placement using the AstraTech Implant System EV and an immediate implant temporary crown using Azento. After 3 months with the temporary crown, a definitive all-ceramic crown, made using a digital workflow will be placed.

06

What researchers measure

Primary outcomes

  1. Percentage of Participants That Had an Implant That Survived 1 Year After Permanent Final Crown Placement.

    For participants that had permanent restoration of the final crown performed, this outcome is determined via clinical evaluation of the percentage of participants that still had their 1 implant in place after 1 year of having the permanent final crown placement. Note: Only 1 implant was placed per participant.

    Time frame: 1 year after permanent final crown placement

07

Results

Posted Oct 3, 2024

Participant flow

Participant flow — Overall Study
MilestoneImplant Placement and Temporary Crown Using AstraTech Implant System EV, Final Crown Delivery
Started25
Completed22
Not completed3

Outcome measures

PrimaryPercentage of Participants That Had an Implant That Survived 1 Year After Permanent Final Crown Placement.

For participants that had permanent restoration of the final crown performed, this outcome is determined via clinical evaluation of the percentage of participants that still had their 1 implant in place after 1 year of having the permanent final crown placement. Note: Only 1 implant was placed per participant.

Time frame:
1 year after permanent final crown placement
Reported as:
Count of participants · Participants
Percentage of Participants That Had an Implant That Survived 1 Year After Permanent Final Crown Placement.
ParticipantsImplant Placement and Temporary Crown Using AstraTech Implant System EV, Final Crown Delivery
Percentage of Participants That Had an Implant That Survived 1 Year After Permanent Final Crown Placement.22

Adverse events

Collected over up to 1 year. Non-serious events are listed at a 0% frequency threshold.

Adverse event summary by group
GroupDeathsSeriousOther
Implant Placement and Temporary Crown Using AstraTech Implant System EV, Final Crown Delivery0/25 (0%)0/25 (0%)0/25 (0%)

Baseline characteristics

The baseline analysis population differs from the final results, because 3 subjects were lost to follow-up over the course of the study.

Age, Categorical
Age, Categorical(Participants)Implant Placement and Temporary Crown Using AstraTech Implant System EV, Final Crown Delivery
<=18 years0
Between 18 and 65 years15
>=65 years10
Sex: Female, Male
Sex: Female, Male(Participants)Implant Placement and Temporary Crown Using AstraTech Implant System EV, Final Crown Delivery
Female16
Male9
Race and Ethnicity Not Collected
Race and Ethnicity Not Collected(Participants)Implant Placement and Temporary Crown Using AstraTech Implant System EV, Final Crown Delivery
Region of Enrollment
Region of Enrollment(Participants)Implant Placement and Temporary Crown Using AstraTech Implant System EV, Final Crown Delivery
United States25
08

Study locations

1 site
  • University of Iowa
    Iowa City, Iowa 52242, United States
09

References and documents

Publications

  • Alkan EA, Parlar A, Yildirim B, Senguven B. Histological comparison of healing following tooth extraction with ridge preservation using enamel matrix derivatives versus Bio-Oss Collagen: a pilot study. Int J Oral Maxillofac Surg. 2013 Dec;42(12):1522-8. doi: 10.1016/j.ijom.2013.06.002. Epub 2013 Jul 8. PubMed 23845297 ↗
  • Araujo M, Linder E, Wennstrom J, Lindhe J. The influence of Bio-Oss Collagen on healing of an extraction socket: an experimental study in the dog. Int J Periodontics Restorative Dent. 2008 Apr;28(2):123-35. PubMed 18546808 ↗
  • Araujo MG, da Silva JCC, de Mendonca AF, Lindhe J. Ridge alterations following grafting of fresh extraction sockets in man. A randomized clinical trial. Clin Oral Implants Res. 2015 Apr;26(4):407-412. doi: 10.1111/clr.12366. Epub 2014 Mar 12. PubMed 24621203 ↗
  • Araujo MG, Liljenberg B, Lindhe J. Dynamics of Bio-Oss Collagen incorporation in fresh extraction wounds: an experimental study in the dog. Clin Oral Implants Res. 2010 Jan;21(1):55-64. doi: 10.1111/j.1600-0501.2009.01854.x. PubMed 20070748 ↗
  • Arora H, Khzam N, Roberts D, Bruce WL, Ivanovski S. Immediate implant placement and restoration in the anterior maxilla: Tissue dimensional changes after 2-5 year follow up. Clin Implant Dent Relat Res. 2017 Aug;19(4):694-702. doi: 10.1111/cid.12487. Epub 2017 Apr 21. PubMed 28429394 ↗
  • Avila-Ortiz G, Elangovan S, Kramer KW, Blanchette D, Dawson DV. Effect of alveolar ridge preservation after tooth extraction: a systematic review and meta-analysis. J Dent Res. 2014 Oct;93(10):950-8. doi: 10.1177/0022034514541127. Epub 2014 Jun 25. PubMed 24966231 ↗
  • Barone A, Aldini NN, Fini M, Giardino R, Calvo Guirado JL, Covani U. Xenograft versus extraction alone for ridge preservation after tooth removal: a clinical and histomorphometric study. J Periodontol. 2008 Aug;79(8):1370-7. doi: 10.1902/jop.2008.070628. PubMed 18672985 ↗
  • Barwacz, C. & Hernandez, M. (2013) Maximizing Esthetics of Fixed Interim Restorations via Direct Extrinsic Characterization. Journal of Cosmetic Dentistry 29, 122-131.
  • Barwacz CA, Pantzlaff E, Allareddy V, Avila-Ortiz G. Graduate Periodontics Programs' Integration of Implant Provisionalization in Core Curricula: Implementation of CODA Standard 4-10.2.d. J Dent Educ. 2017 Jun;81(6):696-706. doi: 10.21815/JDE.016.033. PubMed 28572416 ↗
  • Barwacz CA, Stanford CM, Diehl UA, Cooper LF, Feine J, McGuire M, Scheyer ET. Pink Esthetic Score Outcomes Around Three Implant-Abutment Configurations: 3-Year Results. Int J Oral Maxillofac Implants. 2018 Sep/Oct;33(5):1126-1135. doi: 10.11607/jomi.6659. PubMed 30231101 ↗
  • Cooper LF, Reside G, Stanford C, Barwacz C, Feine J, Nader SA, Scheyer T, McGuire M. Three-Year Prospective Randomized Comparative Assessment of Anterior Maxillary Single Implants with Different Abutment Interfaces. Int J Oral Maxillofac Implants. 2019 Jan/Feb;34(1):150-158. doi: 10.11607/jomi.6810. PubMed 30695089 ↗
  • Cooper LF, Tarnow D, Froum S, Moriarty J, De Kok IJ. Comparison of Marginal Bone Changes with Internal Conus and External Hexagon Design Implant Systems: A Prospective, Randomized Study. Int J Periodontics Restorative Dent. 2016 Sep-Oct;36(5):631-42. doi: 10.11607/prd.2433. PubMed 27560668 ↗
  • Crespi R, Cappare P, Crespi G, Gastaldi G, Romanos GE, Gherlone E. Tissue Remodeling in Immediate Versus Delayed Prosthetic Restoration in Fresh Socket Implants in the Esthetic Zone: Four-Year Follow-up. Int J Periodontics Restorative Dent. 2018;38(Suppl):s97-s103. doi: 10.11607/prd.3123. Epub 2018 Mar 7. PubMed 29513776 ↗
  • De Rouck T, Collys K, Wyn I, Cosyn J. Instant provisionalization of immediate single-tooth implants is essential to optimize esthetic treatment outcome. Clin Oral Implants Res. 2009 Jun;20(6):566-70. doi: 10.1111/j.1600-0501.2008.01674.x. Epub 2009 Mar 3. PubMed 19302238 ↗
  • Furhauser R, Florescu D, Benesch T, Haas R, Mailath G, Watzek G. Evaluation of soft tissue around single-tooth implant crowns: the pink esthetic score. Clin Oral Implants Res. 2005 Dec;16(6):639-44. doi: 10.1111/j.1600-0501.2005.01193.x. PubMed 16307569 ↗
  • Heberer S, Al-Chawaf B, Hildebrand D, Nelson JJ, Nelson K. Histomorphometric analysis of extraction sockets augmented with Bio-Oss Collagen after a 6-week healing period: a prospective study. Clin Oral Implants Res. 2008 Dec;19(12):1219-25. doi: 10.1111/j.1600-0501.2008.01617.x. No abstract available. PubMed 19040436 ↗
  • Heinemann F, Hasan I, Schwahn C, Bourauel C, Mundt T. Bone level change of extraction sockets with Bio-Oss collagen and implant placement: a clinical study. Ann Anat. 2012 Nov;194(6):508-12. doi: 10.1016/j.aanat.2011.11.012. Epub 2011 Dec 23. PubMed 22244384 ↗
  • Iasella JM, Greenwell H, Miller RL, Hill M, Drisko C, Bohra AA, Scheetz JP. Ridge preservation with freeze-dried bone allograft and a collagen membrane compared to extraction alone for implant site development: a clinical and histologic study in humans. J Periodontol. 2003 Jul;74(7):990-9. doi: 10.1902/jop.2003.74.7.990. PubMed 12931761 ↗
  • Jung RE, Philipp A, Annen BM, Signorelli L, Thoma DS, Hammerle CH, Attin T, Schmidlin P. Radiographic evaluation of different techniques for ridge preservation after tooth extraction: a randomized controlled clinical trial. J Clin Periodontol. 2013 Jan;40(1):90-8. doi: 10.1111/jcpe.12027. Epub 2012 Nov 19. PubMed 23163915 ↗
  • Kan JY, Rungcharassaeng K, Lozada J. Immediate placement and provisionalization of maxillary anterior single implants: 1-year prospective study. Int J Oral Maxillofac Implants. 2003 Jan-Feb;18(1):31-9. PubMed 12608666 ↗
  • Kan JY, Rungcharassaeng K, Umezu K, Kois JC. Dimensions of peri-implant mucosa: an evaluation of maxillary anterior single implants in humans. J Periodontol. 2003 Apr;74(4):557-62. doi: 10.1902/jop.2003.74.4.557. PubMed 12747463 ↗
  • Lekovic V, Kenney EB, Weinlaender M, Han T, Klokkevold P, Nedic M, Orsini M. A bone regenerative approach to alveolar ridge maintenance following tooth extraction. Report of 10 cases. J Periodontol. 1997 Jun;68(6):563-70. doi: 10.1902/jop.1997.68.6.563. PubMed 9203100 ↗
  • Nart J, Barallat L, Jimenez D, Mestres J, Gomez A, Carrasco MA, Violant D, Ruiz-Magaz V. Radiographic and histological evaluation of deproteinized bovine bone mineral vs. deproteinized bovine bone mineral with 10% collagen in ridge preservation. A randomized controlled clinical trial. Clin Oral Implants Res. 2017 Jul;28(7):840-848. doi: 10.1111/clr.12889. Epub 2016 Jun 22. PubMed 27335267 ↗
  • Nevins M, Camelo M, De Paoli S, Friedland B, Schenk RK, Parma-Benfenati S, Simion M, Tinti C, Wagenberg B. A study of the fate of the buccal wall of extraction sockets of teeth with prominent roots. Int J Periodontics Restorative Dent. 2006 Feb;26(1):19-29. PubMed 16515093 ↗
  • Noelken R, Oberhansl F, Kunkel M, Wagner W. Immediately provisionalized OsseoSpeed() Profile implants inserted into extraction sockets: 3-year results. Clin Oral Implants Res. 2016 Jun;27(6):744-9. doi: 10.1111/clr.12651. Epub 2015 Aug 24. PubMed 26300062 ↗
  • Ponsi J, Lahti S, Rissanen H, Oikarinen K. Change in subjective oral health after single dental implant treatment. Int J Oral Maxillofac Implants. 2011 May-Jun;26(3):571-7. PubMed 21691604 ↗
  • Raes F, Cooper LF, Tarrida LG, Vandromme H, De Bruyn H. A case-control study assessing oral-health-related quality of life after immediately loaded single implants in healed alveolar ridges or extraction sockets. Clin Oral Implants Res. 2012 May;23(5):602-8. doi: 10.1111/j.1600-0501.2011.02178.x. Epub 2011 Apr 19. PubMed 21504481 ↗
  • Roccuzzo M, Gaudioso L, Lungo M, Dalmasso P. Surgical therapy of single peri-implantitis intrabony defects, by means of deproteinized bovine bone mineral with 10% collagen. J Clin Periodontol. 2016 Mar;43(3):311-8. doi: 10.1111/jcpe.12516. Epub 2016 Mar 9. PubMed 26800389 ↗
  • Scheyer ET, Heard R, Janakievski J, Mandelaris G, Nevins ML, Pickering SR, Richardson CR, Pope B, Toback G, Velasquez D, Nagursky H. A randomized, controlled, multicentre clinical trial of post-extraction alveolar ridge preservation. J Clin Periodontol. 2016 Dec;43(12):1188-1199. doi: 10.1111/jcpe.12623. Epub 2016 Oct 21. PubMed 27617409 ↗
  • Spyropoulou PE, Razzoog M, Sierraalta M. Restoring implants in the esthetic zone after sculpting and capturing the periimplant tissues in rest position: a clinical report. J Prosthet Dent. 2009 Dec;102(6):345-7. doi: 10.1016/S0022-3913(09)60189-X. PubMed 19961991 ↗
  • Stanford CM, Barwacz C, Raes S, De Bruyn H, Cecchinato D, Bittner N, Brandt J. Multicenter Clinical Randomized Controlled Trial Evaluation of an Implant System Designed for Enhanced Primary Stability. Int J Oral Maxillofac Implants. 2016 Jul-Aug;31(4):906-15. doi: 10.11607/jomi.4869. PubMed 27447160 ↗
  • Strietzel FP, Neumann K, Hertel M. Impact of platform switching on marginal peri-implant bone-level changes. A systematic review and meta-analysis. Clin Oral Implants Res. 2015 Mar;26(3):342-58. doi: 10.1111/clr.12339. Epub 2014 Jan 20. PubMed 24438506 ↗
  • Su H, Gonzalez-Martin O, Weisgold A, Lee E. Considerations of implant abutment and crown contour: critical contour and subcritical contour. Int J Periodontics Restorative Dent. 2010 Aug;30(4):335-43. PubMed 20664835 ↗

Study documents

  • Protocol and statistical analysis plan · Aug 9, 2024

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

Individual participant data

Plan to share: No

10

Updates

Tracking since Sep 25, 2026
No changes since tracking began. The registry record was last updated on Oct 3, 2024, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
11

Registry details

Key details

Study ID
NCT04255342
Lead sponsor
Christopher Barwacz
Responsible party
Christopher Barwacz (Principal Investigator, University of Iowa) — Sponsor-investigator
First posted
Feb 5, 2020
Start date
Jan 29, 2020
Primary completion
Jan 30, 2024
Completion
Jan 30, 2024
Results posted
Oct 3, 2024
Last update
Oct 3, 2024

Study contacts

Christopher Barwacz, DDS
principal investigator · University of Iowa

Oversight

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

Not currently enrolling

This study is terminated, as verified in Sep 2024. You cannot join it, but the record below documents what was studied.

Follow this study

Get an email when the registry record changes — status, dates, results — or when someone posts here.

Sign in to follow

Discussion

Questions and observations about this study, from anyone following it. Not medical advice, and not a channel to the study team — their contact details are on the registry record.

Sign in to join the discussion. Reading takes no account; posting does. You choose a display name, and a pseudonym is the default.

Nothing here yet. If you are running this trial, taking part in it, or weighing whether to, this is the place to say so.

Start the discussion