A Comparision of Two Types of Decalcified Freeze-Dried Bone Allograft in Treatment of Dehiscence Defects around Implants in Dogs
Associate Professor, Department of Periodontics and Torabinejad Dental Research Center, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran. Dental research journal
Decalcified freeze-dried bone allograft (DFDBA) may have the potential to enhance bone formation around dental implants. Our aim in this study was the evaluation and comparison of two types of DFDBA in treatment of dehiscence defects around Euroteknika(®) implants in dogs.
In this prospective clinical trial animal study, all mandibular premolars of three Iranian dogs were extracted. After 3 months of healing, fifteen SLA type Euroteknika(®) dental implants (Natea) with 4.1mm diameter and 10mm length were placed in osteotomy sites with dehiscence defects of 5mm length, 4 mm width, and 3mm depth. Guided bone regeneration (GBR) procedures were performed using Cenobone and collagen membrane for six implants, the other six implants received Dembone and collagen membrane and the final three implants received only collagen membrane. All implants were submerged. After 4 months of healing, implants were uncovered and stability (Implant Stability Quotient) of all implants was measured. Then, block biopsies of each implant site were taken and processed for ground sectioning and histomorphometric analysis. The data was analyzed by ANOVA and Pearson tests. P value less than 0.05 was considered to be significant.
All implants osseointegrated after 4 months. The mean values of bone to implant contact for histomorphometric measurements of Cenobone, Denobone, and control groups were 77.36 ± 9.96%, 78.91 ± 11.9% and 71.56 ± 5.61% respectively, with no significant differences among the various treatment groups. The correlation of Implant Stability Quotient and histomorphometric techniques was 0.692.
In treating of dehiscence defects with GBR technique in this study, adding DFDBA did not significantly enhance the percentages of bone-to-implant contact measurements; and Implant Stability Quotient Resonance Frequency Analysis appeared to be a precise technique.
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ABSTRACT: Aim The aim of the present study was to test the osteogenic potential of a synthetic hydrogel made of polyethylene glycol (PEG), loaded with adult mesenchymal stem cells, used as a biodegradable membrane for guided bone regeneration (GBR). Materials and methods Adult mesenchymal stem cells derived from adipose tissue (ADSCs) were isolated, characterized, and seeded on the hydrogel. After 15 days of culture, the scaffolds were analyzed with scanning electron microscopy (SEM) and real-time PCR to assess osteogenesis, and by means array CGH (Comparative Genomic Hybridization) to test their safety. Results The in vitro results confirmed that the ADSCs were able to attach to the hydrogel and differentiate towards the osteogenic phenotype. Furthermore, array CGH analysis detected no chromosomal abnormalities, confirming the safety of the 3D cultures. Conclusion The PEG hydrogel, loaded with adult mesenchymal stem cells, seems to have an osteogenic potential and therefore could be successfully used as a membrane in the treatment of bone defects.. osteoproperties of polyethylene glycol hydrogel material. J osseointegr 2014;6(3):XX-XX. DiegO LOpS 1 , LeTiziA FeRROni 2 , ChiARA gARDin 2 , SARA RiCCi 3 , RiCCARDO guAzzO 3 , LuCA SBRiCOLi 3 , eugeniO ROMeO 1 , JOSé L. CALvO-guiRADO 4 , eRiBeRTO BReSSAn 3 , BARBARA zAvAn 2 inTRODuCTiOn
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ABSTRACT: The primary factor causing recession is the morphology and anatomy of the dentition. The facial bony plate overlying the root is usually very thin. The complete absence of bone over the facial root surface is referred to as dehiscence. Such buccal bone defects in case of implant dentistry threaten the survival of dental implant. Many surgical techniques are introduced to enhance alveolar bone volume for placing the dental implants. Guided bone regeneration (GBR) is one such established surgical technique for correcting buccal dehiscence defects, along with the use of various barrier membranes for the same. This case report describes an implant placement in the maxillary left lateral incisor region showing dehiscence on the labial cortical plate, along with bone graft and GTR membrane.
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