Histologic and histomorphometric analysis of three types of dental implants following 18 months of occlusal loading: a preliminary study in baboons

The aim of this study was to evaluate the soft tissue thickness and marginal bone loss around dental implants with sloped micro-threaded shoulder (30° angle) in comparing with conventional design, inserted 30° degrees angulated in post extraction sockets and immediate loaded with temporary prosthesis simulating the all-on-four protocol. Materials and Methods: Six fox hound dogs received forty-eight post extraction dental implants with the different diameter and length (Medentika, Germany), but with different neck configurations. Two group of implants were inserted 1mm subcrestal. Control group has a micro-threaded neck and the Test group has a sloped microthreaded neck. Immediate loading was applied using a constructed metallic structure. After three months, soft and hard tissue levels were assessed by histomorphometric analysis. Results: The mean soft tissue thickness (STT) was 2.5 ± 0.2 mm for the Control group and 3.3 ± 0.3 mm for Test group (p = 0.036), meanwhile the mean marginal bone loss (MBL) was 1.53 ± 0.34 mm for Control group and, 1.62 ± 0.22 mm for Test group (p > 0.05). Conclusions: Within the limitations of this experimental model in dogs, the findings showed that dental implants with microthreaded and microthreaded sloped necks installed in immediate post extraction sites with immediate load, presented a comparable perimplant tissue behavior.

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A comparative study of the effectiveness of early and delayed loading of short tissue-level dental implants with hydrophilic surfaces placed in the posterior section of the mandible—A preliminary study

Annals of Anatomy - Anatomischer Anzeiger ◽

10.1016/j.aanat.2017.02.009 ◽

2017 ◽

Vol 212 ◽

pp. 61-68 ◽

Cited By ~ 7

Author(s):

Arkadiusz Makowiecki ◽

Ute Botzenhart ◽

Julia Seeliger ◽

Friedhelm Heinemann ◽

Peter Biocev ◽

...

Keyword(s):

Comparative Study ◽

Dental Implants ◽

Tissue Level ◽

Hydrophilic Surfaces ◽

Posterior Section ◽

Preliminary Study

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Association between Bone Density Values, Primary Stability and Histomorphometric Analysis of Dental Implant Osteotomy Sites on the Upper Jaw

Folia Medica ◽

10.3897/folmed.62.e49424 ◽

2020 ◽

Vol 62 (3) ◽

pp. 563-571

Author(s):

Vasilena Ivanova ◽

Ivan Chenchev ◽

Stefan Zlatev ◽

Dimitar Atanasov

Keyword(s):

Bone Density ◽

Dental Implants ◽

Bone Quality ◽

Mechanical Stability ◽

Primary Stability ◽

Bone Allograft ◽

Histomorphometric Analysis ◽

Socket Preservation ◽

Density Values ◽

Protein Rich

Introduction: Sufficient bone volume, as well as the bone quality characteristics are necessary prerequisites to ensure optimal mechanical stability of the implants and subsequent osseointegration. Aim: The aim of the present study was to assess the correlation between bone density values obtained by cone-beam computed tomography (CBCT), the primary stability of dental implants and the histomorphometric analysis of bone quality. Materials and methods: Following tooth extraction, socket preservation with frieze-dried bone allograft or protein-rich fibrin (PRF) was performed on 30 patients with 30 maxillary teeth in the region from second premolar to second premolar. Four months after the procedure, CBCT was used to assess the bone density (Hounsfield units) in the area of extraction. Thirty bone samples were harvested from implant sites using a trephine drill. They were analyzed with Image J software. Immediately after placing the implant, the implant stability quotient was measured using the Osstell Idx device. Results: The results revealed significant correlations between bone density and primary stability along the vestibulo-oral (r=0.392, p=0.032) and mesiodistal axes (r=0.407, p=0.026). Bone density also correlated strongly with the percentage of newly formed bone (r=0.776, p<0.001). Conclusion: Bone quality, in terms of bone density measured in CBCT and new bone formation are correlated to the primary stability of the dental implants and vice versa.

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Guiding Bone Regeneration with a Novel Biodegradable Polymeric Membrane and Bioceramic Bone Grafts around Dental Implants

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.330-332.1417 ◽

2007 ◽

Vol 330-332 ◽

pp. 1417-1420

Author(s):

L. Li ◽

C.Y. Bao ◽

Guo Min Ou ◽

W.C. Chen ◽

X.J. Zhang ◽

...

Keyword(s):

Bone Graft ◽

Bone Regeneration ◽

Dental Implants ◽

Polymeric Membrane ◽

Collagen Membrane ◽

Graft Material ◽

The Novel ◽

Histomorphometric Analysis ◽

Mongrel Dog ◽

Collagen Membranes

The aim of this study is to evaluate treatment effects of novel GBR membranes (PDLLA membranes) applied to bony defects around dental implants on new bone regeneration alone or in combination with bioceramic bone graft (BIO-OSS®) on the mongrel dog model in comparison with collagen membrane (BIO-GIDE®) and therefore to assess the clinical values of the novel GBR membranes and bioceramic bone graft material in dental implantology. 6 implants were placed in bilateral mandibular of each mongrel dog after preparation of mid- crestal defects. The defects on one side were covered with PDLLA membranes alone or with bone graft, while the contra-lateral sides received collagen membranes alone or with bone graft. These animals were sacrificed at 2, 4, 8,12 weeks post the GBR-operation. And gross sample examination, standardized radiographs, 99mTc-MDP SPECT and histomorphometric analysis were taken. All examinations showed similar amounts of newly formed bone beneath both types of barriers. The PDLLA or collagen membrane with bone graft groups showed better results than the membrane used alone groups. The results indicated that PDLLA membranes especially with bioceramic bone graft presented an improved response in dealing with bony defects around implants.

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