Long-Term Bone Dimensional Changes Following Flapless Immediate Implant Placement
2026年9月4日 更新者：International Dental Contiuing Education
Long-Term Bone Dimensional Changes Following Flapless Immediate Implant Placement With or Without Bone Grafting: A 5 Years Follow up of a Randomized Clinical Trial
Nowadays, achieving long-term hard tissue stability is the definitive goal of a successful immediate implant placement and has become the optimal challenge for clinicians over the past few decades.
It is wellestablished that the dimensional changes and remodeling of the alveolar ridge represent a physiologic sequela of tooth extraction and is inevitable especially the labial bone wall.
This creates an unfavorable labio-palatal discrepancy and produces the "fixture-socket gap" around the coronal portion of the implant, known as the labial gap especially in sockets with thin bone.Although this gap has the potential to repair spontaneously in some cases, still previous studies reported that this gap cannot be completely filled without using a regenerative material.
It has been claimed that buccal/labial gap augmentation contributes to the final esthetic success of the dental implant, where the regenerative material acts as a scaffold to maintain the blood clot, promote bone formation, compensate for the postextraction socket remodeling and maintain the buccal bone thickness and thereby preventing the buccal contour collapse.
Nevertheless, this would add an additional cost and prolong the surgical procedure.
Meanwhile, there is a controversy in the existing literature regarding the actual benefit of using bone grafts in the buccal gap.
Previous systematic reviews concluded that there is not sufficient evidence to prove that immediate implant placement with grafting the labial gap, would comprise an additional benefit in preventing alveolar ridge reduction and contour collapse.
Furthermore, previous controlled clinical trials reported that evidence for this additional treatment is still unclear.
調査の概要
詳細な説明
Patients who completed the initial trial and received a single immediate implant in a fresh extraction socket would be invited for reassessment at 5 years after implant placement.
The intervention group would comprise patients treated with flapless immediate implant placement combined with grafting of the peri-implant gap using the same bone-substitute material and protocol applied in the original study, while the control group would comprise patients treated with flapless immediate implant placement without bone grafting.
The primary outcome would be the change in peri-implant marginal bone level and three-dimensional alveolar ridge dimensions, assessed by standardized periapical radiographs and, where ethically and clinically justified, limited-field cone-beam computed tomography, compared with baseline and the earlier follow-up measurements.
Secondary outcomes would include implant survival and success, peri-implant probing depth, bleeding on probing, plaque accumulation, mucosal recession, width of keratinized mucosa, facial soft-tissue profile, biological complications, prosthetic complications, patient satisfaction, and esthetic outcomes.
Assessments should be performed by calibrated, blinded examiners using standardized imaging and clinical protocols.
The study would analyze all eligible participants according to their original randomized allocation, report reasons for loss to follow-up, and compare the long-term dimensional stability and clinical performance of grafted versus nongrafted sites.
The principal hypothesis would be that bone grafting may reduce long-term horizontal ridge resorption and improve preservation of the facial contour without adversely affecting implant survival or peri-implant health over the 5-year observation period.
研究の種類
介入
入学 (推定)
40
段階
- 適用できない
連絡先と場所
このセクションには、調査を実施する担当者の連絡先の詳細と、この調査が実施されている場所に関する情報が記載されています。
研究場所
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Cairo、エジプト
- International Dental Continuing Education (IDCE) Research Institute
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参加基準
研究者は、適格基準と呼ばれる特定の説明に適合する人を探します。これらの基準のいくつかの例は、人の一般的な健康状態または以前の治療です。
適格基準
就学可能な年齢
- 大人
健康ボランティアの受け入れ
いいえ
説明
Inclusion Criteria:
- Adult (>20 years) with nonrestorable maxillary teeth in the esthetic zone, thick gingival phenotype, intact but thin labial plate of bone extending 7 mm (≤1 mm) and intact palatal bone extending at least 6 mm apically, sufficient apical bone to attain implant primary stability (a minimum of 35 N cm insertion torque) and labio-palatal socket dimension measured from the CBCT axial cut at mid-crestal part ≥5 mm.
Exclusion Criteria:
- Smokers, pregnant women, patients with systemic disease, patients with parafunctional habits such as bruxism or clenching, infected socket, periapical pathosis and history of radiotherapy or chemotherapy within the past 2 years.
研究計画
このセクションでは、研究がどのように設計され、研究が何を測定しているかなど、研究計画の詳細を提供します。
研究はどのように設計されていますか？
デザインの詳細
- 主な目的：他の
- 割り当て：ランダム化
- 介入モデル：並列代入
- マスキング：独身
武器と介入
参加者グループ / アーム |
介入・治療 |
|---|---|
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アクティブコンパレータ：IIP + Bone graft + CHA
For patients assigned to receive a graft, demineralized bovine bone graft (Bio-Oss, Geistlich Pharma AG, Wolhusen, Switzerland) was placed in the gap labial to the implant to the level of the implant platform.
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A tapered screw-vent bone level implant (Zimmer implant TSV, IN, USA) was inserted into the extraction socket in a flapless manner, engaging 3-4 mm of the sound intact apical and palatal bone to achieve primary stability using the motor and manual torque wrench which was set to be at least 35 N cm to allow nonfunctional immediate loading.
The implant platform was located 1.5 mm subcrestal or equicrestal to the labial bone and the implant diameter was selected to leave a labial gap of at least 1.5 mm.
Following implant placement, randomization sequence with allocation to either graft or no graft group was revealed.
For patients assigned to receive a graft, demineralized bovine bone graft (Bio-Oss, Geistlich Pharma AG, Wolhusen, Switzerland) was placed in the gap labial to the implant to the level of the implant platform.
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実験的：IIP + CHA only
A tapered screw-vent bone level implant (Zimmer implant TSV, IN, USA) was inserted into the extraction socket in a flapless manner, engaging mm of the sound intact apical and palatal bone to achieve primary stability using the motor and manual torque wrench which was set to be at least 35 N cm to allow nonfunctional immediate loading.
The implant platform was located 1.5 mm subcrestal or equicrestal to the labial bone and the implant diameter was selected to leave a labial gap of at least 1.5 mm.
Following implant placement, patients received an immediate anatomical customized healing abutment fabricated by adding flowable composite to the temporary cylindrical abutment mimicking the shape of the socket at the marginal gingiva (Filtek™ Supreme Ultra Flowable Restorative, 3M Corporate Headquarters, MN, USA).
It was then screwed to the implant
|
A tapered screw-vent bone level implant (Zimmer implant TSV, IN, USA) was inserted into the extraction socket in a flapless manner, engaging 3-4 mm of the sound intact apical and palatal bone to achieve primary stability using the motor and manual torque wrench which was set to be at least 35 N cm to allow nonfunctional immediate loading.
The implant platform was located 1.5 mm subcrestal or equicrestal to the labial bone and the implant diameter was selected to leave a labial gap of at least 1.5 mm.
Following implant placement, randomization sequence with allocation to either graft or no graft group was revealed.
For patients assigned to receive no graft an immediate anatomical customized healing abutment fabricated by adding flowable composite to the temporary cylindrical abutment mimicking the mimicking the shape of the socket at the marginal gingiva was screwed to the implant
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この研究は何を測定していますか？
主要な結果の測定
結果測定 |
メジャーの説明 |
時間枠 |
|---|---|---|
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Labial bone formed labial to the implant
時間枠：5 years follow up
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Measure using the CBCT, the amount of bone formed labial to the implant
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5 years follow up
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協力者と研究者
ここでは、この調査に関係する人々や組織を見つけることができます。
研究記録日
これらの日付は、ClinicalTrials.gov への研究記録と要約結果の提出の進捗状況を追跡します。研究記録と報告された結果は、国立医学図書館 (NLM) によって審査され、公開 Web サイトに掲載される前に、特定の品質管理基準を満たしていることが確認されます。
主要日程の研究
研究開始 (推定)
2026年10月1日
一次修了 (推定)
2026年11月1日
研究の完了 (推定)
2026年12月1日
試験登録日
最初に提出
2026年9月4日
QC基準を満たした最初の提出物
2026年9月4日
最初の投稿 (実際)
2026年9月10日
学習記録の更新
投稿された最後の更新 (実際)
2026年9月10日
QC基準を満たした最後の更新が送信されました
2026年9月4日
最終確認日
2026年9月1日
詳しくは
本研究に関する用語
キーワード
その他の研究ID番号
- IDCE-4292026
個々の参加者データ (IPD) の計画
個々の参加者データ (IPD) を共有する予定はありますか?
いいえ
医薬品およびデバイス情報、研究文書
米国FDA規制医薬品の研究
いいえ
米国FDA規制機器製品の研究
いいえ
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