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Musskopf ML, Finger Stadler A, Fiorini T, Ramos UD, de Sousa Rabelo M, de Castro Pinto RN, Susin C. Performance of a new implant system and drilling protocol-A minipig intraoral dental implant model study. Clin Oral Implants Res 2024; 35:40-51. [PMID: 37855174 DOI: 10.1111/clr.14194] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2022] [Revised: 07/06/2023] [Accepted: 09/19/2023] [Indexed: 10/20/2023]
Abstract
AIM A new implant system encompassing implants with a tri-oval cross-sectional design and a simplified site preparation protocol at low speed and no irrigation has been developed. The objective of this study was to assess the safety and efficacy of the new implant system using the minipig intraoral dental implant model. METHODS Eight Yucatan minipigs were included. Twelve weeks after extractions, four implants per animal were randomly placed and allowed to heal transmucosal for 13 weeks: two Ø3.5 × 10 mm implants with a back-tapered collar and circular cross-section (control) and two Ø3.5 × 11 mm implants with tri-oval collar and cross-section (test). MicroCT and histological analysis was performed. RESULTS Thirty-two implants were placed; one implant for the control group was lost. Histologically, BIC was higher in the test compared with the control group (74.1% vs. 60.9%, p < .001). At the platform level, inflammation was statistically significantly higher albeit mild in the test compared with the control group. No other significant differences were observed between groups. MicroCT analysis showed that bone-to-implant-contact (BIC) and trabecular thickness were statistically significantly higher for the test than the control group. Test group had significantly higher first BIC distance than controls on lingual sites. CONCLUSIONS The present study results support the safety and efficacy of the new dental implant system and simplified site preparation protocol; human studies should be carried out to confirm these findings.
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Affiliation(s)
- Marta Liliana Musskopf
- Laboratory for Applied Periodontal & Craniofacial Research, Division of Comprehensive Oral Health - Periodontology, Adams School of Dentistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
| | - Amanda Finger Stadler
- Laboratory for Applied Periodontal & Craniofacial Research, Division of Comprehensive Oral Health - Periodontology, Adams School of Dentistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
| | - Tiago Fiorini
- Department of Conservative Dentistry - Periodontology, Faculty of Dentistry, Federal University of Rio Grande do Sul, Porto Alegre, Brazil
| | | | | | | | - Cristiano Susin
- Laboratory for Applied Periodontal & Craniofacial Research, Division of Comprehensive Oral Health - Periodontology, Adams School of Dentistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
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Oral Cell Lysates Reduce the Inflammatory Response of Activated Macrophages. J Clin Med 2023; 12:jcm12041701. [PMID: 36836236 PMCID: PMC9962209 DOI: 10.3390/jcm12041701] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2022] [Revised: 02/13/2023] [Accepted: 02/18/2023] [Indexed: 02/23/2023] Open
Abstract
Necrotic cell damage occurs as a consequence of invasive dental procedures. Loss of membrane integrity being the hallmark of necrotic cells leads to the release of cytoplasmic and membranous components. Macrophages are predestined to respond to lysates originating from necrotic cells. Here, we implement necrotic lysates from human gingival fibroblasts, HSC2, and TR146 oral epithelial cell lines, and RAW264.7 macrophage cell lines to be tested for their potential to modulate the inflammatory response of macrophages. To this aim, necrotic cell lysates were prepared by sonication or freezing/thawing of the respective cell suspension. Necrotic cell lysates were tested for their potential to modulate the lipopolysaccharide (LPS)-induced expression of inflammatory cytokines using RAW264.7 macrophages as a bioassay. We show here that all necrotic cell lysates, independent of the origin and the preparation way, reduced the expression of IL1 and IL6 in LPS-induced RAW264.7 macrophages, most obviously shown for TR146 cells. This finding was supported in a bioassay when macrophages were exposed to poly (I:C) HMW, an agonist of TLR-3. Consistently, all necrotic lysates from gingival fibroblasts, HSC2, TR146, and RAW264.7 cells reduced the nuclear translocation of p65 in LPS-exposed macrophages. This screening approach supports the overall concept that necrotic cell lysates can modulate the inflammatory capacity of macrophages.
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Fabbri G, Staas T, Urban I. A Retrospective Observational Study Assessing the Clinical Outcomes of a Novel Implant System with Low-Speed Site Preparation Protocol and Tri-Oval Implant Geometry. J Clin Med 2022; 11:jcm11164859. [PMID: 36013098 PMCID: PMC9410172 DOI: 10.3390/jcm11164859] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2022] [Revised: 08/09/2022] [Accepted: 08/16/2022] [Indexed: 11/16/2022] Open
Abstract
A novel, biologically friendly implant concept system introduces low-speed (50 rpm) site preparation instruments used without irrigation and a tri-oval, tapered implant designed to reduce stress on cortical bone without sacrificing mechanical stability. This retrospective, observational, multicenter study (clinicaltrials.gov NCT04736771) collected data from consecutive patients treated with at least one novel concept system implant to evaluate clinical outcomes after 1 year in function. The primary endpoint was a marginal bone level change (MBLC) from loading to 1 year, and secondary endpoints included implant survival and clinician feedback. Ninety-five patients (54 women and 41 men, mean age: 58 ± 12 years) were treated with 165 implants. For 94.5% of implants, site preparation was performed in two steps. The mean follow-up from implant insertion was 1.8 ± 0.2 years. Mean MBLC from implant loading to 1-year follow-up was +0.15 ± 0.85 mm (n = 124 implants). At the last follow-up, the implant survival rate was 98.0%. Clinician satisfaction with the novel concept system was high. The novel concept system offers an easy-to-use implant placement protocol, with most implants placed using two steps. The minimal bone remodeling and high survival rate observed across a variety of indications and treatment protocols demonstrate broad versatility and confirm the clinical benefits of this biologically friendly innovation.
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Affiliation(s)
- Giacomo Fabbri
- Studio Odontoiatrico Specialistico Ban Mancini Fabbri, Via del Porto 17, 47841 Cattolica, Italy
- Correspondence:
| | - Tristan Staas
- Staas & Bergmans, Schubertsingel 32, 5216 XA ‘s-Hertogenbosch, The Netherlands
| | - Istvan Urban
- Urban Dental Center Kft, Pitypang Street 7, 1025 Budapest, Hungary
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Panahipour L, Abbasabadi AO, Kaiser V, Sordi MB, Kargarpour Z, Gruber R. Damaged Mesenchymal Cells Dampen the Inflammatory Response of Macrophages and the Formation of Osteoclasts. J Clin Med 2022; 11:jcm11144061. [PMID: 35887825 PMCID: PMC9319356 DOI: 10.3390/jcm11144061] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2022] [Revised: 06/29/2022] [Accepted: 07/11/2022] [Indexed: 01/25/2023] Open
Abstract
Damage to mesenchymal cells occurs by dental implant drills as a consequence of shear forces and heat generation. However, how the damaged mesenchymal cells can affect the polarization of macrophages and their differentiation into osteoclastogenesis is not fully understood. To simulate cell damage, we exposed suspended ST2 murine bone marrow stromal cells to freeze/thawing or sonication cycles, followed by centrifugation. We then evaluated the lysates for their capacity to modulate lipopolysaccharide-induced macrophage polarization and RANKL-MCSF-TGF-β-induced osteoclastogenesis. We report that lysates of ST2, particularly when sonicated, greatly diminished the expression of inflammatory IL6 and COX2 as well as moderately increased arginase 1 in primary macrophages. That was confirmed by lysates obtained from the osteocytic cell line IDG-SW3. Moreover, the ST2 lysate lowered the phosphorylation of p65 and p38 as well as the nuclear translocation of p65. We further show herein that lysates of damaged ST2 reduced the formation of osteoclast-like cells characterized by their multinuclearity and the expression of tartrate-resistant phosphatase and cathepsin K. Taken together, our data suggest that thermal and mechanical damage of mesenchymal cells causes the release of as-yet-to-be-defined molecules that dampen an inflammatory response and the formation of osteoclasts in vitro.
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Affiliation(s)
- Layla Panahipour
- Department of Oral Biology, University Clinic of Dentistry, Medical University of Vienna, 1090 Vienna, Austria; (L.P.); (A.O.A.); (V.K.); (M.B.S.); (Z.K.)
| | - Azarakhsh Oladzad Abbasabadi
- Department of Oral Biology, University Clinic of Dentistry, Medical University of Vienna, 1090 Vienna, Austria; (L.P.); (A.O.A.); (V.K.); (M.B.S.); (Z.K.)
| | - Viktoria Kaiser
- Department of Oral Biology, University Clinic of Dentistry, Medical University of Vienna, 1090 Vienna, Austria; (L.P.); (A.O.A.); (V.K.); (M.B.S.); (Z.K.)
| | - Mariane Beatriz Sordi
- Department of Oral Biology, University Clinic of Dentistry, Medical University of Vienna, 1090 Vienna, Austria; (L.P.); (A.O.A.); (V.K.); (M.B.S.); (Z.K.)
- Department of Dentistry, Federal University of Santa Catarina, Florianopolis 88040-900, Brazil
| | - Zahra Kargarpour
- Department of Oral Biology, University Clinic of Dentistry, Medical University of Vienna, 1090 Vienna, Austria; (L.P.); (A.O.A.); (V.K.); (M.B.S.); (Z.K.)
| | - Reinhard Gruber
- Department of Oral Biology, University Clinic of Dentistry, Medical University of Vienna, 1090 Vienna, Austria; (L.P.); (A.O.A.); (V.K.); (M.B.S.); (Z.K.)
- Department of Periodontology, School of Dental Medicine, University of Bern, 3010 Bern, Switzerland
- Austrian Cluster for Tissue Regeneration, 1200 Vienna, Austria
- Correspondence: ; Tel.: +43-(0)-1-40070-2660
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Ticha P, Pilawski I, Helms JA. Multiscale analysis of craniomaxillofacial bone repair: A preclinical mini pig study. J Periodontol 2022; 93:1701-1711. [PMID: 35194780 DOI: 10.1002/jper.21-0426] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2021] [Revised: 01/23/2022] [Accepted: 01/24/2022] [Indexed: 11/08/2022]
Abstract
BACKGROUND The rate of reparative osteogenesis controls when an implant is sufficiently stable as to allow functional loading. Using a mini pig model, the rate of reparative osteogenesis in two types of implant sites e.g., an osteotomy versus a fresh extraction socket were compared. METHODS Eight adult mini pigs were used for the study. In Phase I, three premolars were extracted on one side of the oral cavity; 12 weeks later, in Phase II, osteotomies were produced in healed extraction sites, and contralateral premolars were extracted. Animals were sacrificed 1, 5, and 12 weeks after Phase II. Bone repair and remodeling were evaluated using quantitative micro-computed tomographic imaging, histology, and histochemical assays coupled with quantitative dynamic histomorphometry. RESULTS One week after surgery, extraction sockets and osteotomy sites exhibited similar patterns of new bone deposition. Five weeks after surgery, mineral apposition rates were elevated at the injury sites relative to intact bone. Twelve weeks after surgery, the density of new bone in both injury sites was equivalent to intact bone but quantitative dynamic histomorphometry and cellular activity assays demonstrated bone remodeling was still underway. CONCLUSION(S) The mechanisms and rates of reparative osteogenesis were equivalent between fresh extraction sockets and osteotomies. The volume of new bone required to fill a socket, however, was significantly greater than the volume required to fill an osteotomy. These data provide a framework for estimating the rate of reparative osteogenesis and the time to loading of implants placed in healed sites versus fresh extraction sockets. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- Pavla Ticha
- Division of Plastic and Reconstructive Surgery, Department of Surgery, Stanford University School of Medicine, Stanford, CA, 94305, USA.,Department of Plastic Surgery, 3rd Faculty of Medicine and University Hospital Kralovske Vinohrady, Charles University in Prague, Srobarova 50, Prague 10, 10034, Czech Republic
| | - Igor Pilawski
- Division of Plastic and Reconstructive Surgery, Department of Surgery, Stanford University School of Medicine, Stanford, CA, 94305, USA
| | - Jill A Helms
- Division of Plastic and Reconstructive Surgery, Department of Surgery, Stanford University School of Medicine, Stanford, CA, 94305, USA
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Pan J, Pilawski I, Yuan X, Arioka M, Ticha P, Tian Y, Helms JA. Interspecies comparison of alveolar bone biology: Tooth extraction socket healing in mini pigs and mice. J Periodontol 2020; 91:1653-1663. [PMID: 32347546 DOI: 10.1002/jper.19-0667] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2019] [Revised: 02/24/2020] [Accepted: 03/10/2020] [Indexed: 12/29/2022]
Affiliation(s)
- Jie Pan
- West China School of Stomatology Sichuan University Chengdu China
- Department of Plastic and Reconstructive Surgery School of Medicine Stanford University Palo Alto California USA
| | - Igor Pilawski
- Department of Plastic and Reconstructive Surgery School of Medicine Stanford University Palo Alto California USA
| | - Xue Yuan
- Department of Plastic and Reconstructive Surgery School of Medicine Stanford University Palo Alto California USA
| | - Masaki Arioka
- Department of Plastic and Reconstructive Surgery School of Medicine Stanford University Palo Alto California USA
- Department of Clinical Pharmacology Kyushu University Fukuoka Japan
| | - Pavla Ticha
- Department of Plastic and Reconstructive Surgery School of Medicine Stanford University Palo Alto California USA
| | - Ye Tian
- West China School of Stomatology Sichuan University Chengdu China
- Department of Plastic and Reconstructive Surgery School of Medicine Stanford University Palo Alto California USA
| | - Jill A. Helms
- Department of Plastic and Reconstructive Surgery School of Medicine Stanford University Palo Alto California USA
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Preoperative Evaluation of V-Y Flap Design Based on Computer-Aided Analysis. COMPUTATIONAL AND MATHEMATICAL METHODS IN MEDICINE 2020; 2020:8723571. [PMID: 32411287 PMCID: PMC7201642 DOI: 10.1155/2020/8723571] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/15/2019] [Revised: 12/09/2019] [Accepted: 12/16/2019] [Indexed: 11/18/2022]
Abstract
V-Y flap is widely used in plastic surgery as an important technique for reconstructing deformities and improving appearance. In this paper, a geometrical parameter model and finite element analysis were used to study the rationale of the proposed V-Y flap design and the preoperative evaluation of the V-Y flap design. First, a geometric parameter model of the V-Y flap was established to analyze the five key geometric relationships affecting the flap structure and obtain a reasonable plan for the V-Y flap design through the crossing constraint relationship. Second, in order to verify the effectiveness of the V-Y flap design, the suture and release states of the V-Y flap during surgery were evaluated based on a simulation model of the V-Y flap generated by finite element analysis software. The results revealed that the approach proposed in this paper provides a feasible method for clinical V-Y flap design.
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