Journal of Dental Implants最新文献

{"title":"Effects of melatonin on adult human mesenchymal stem cells in osteoblastic differentiation","authors":"R. Raheja","doi":"10.4103/jdi.jdi_29_19","DOIUrl":"https://doi.org/10.4103/jdi.jdi_29_19","url":null,"abstract":"Among the numerous functions of melatonin, the control of survival and differentiation of mesenchymal stem cells (MSCs) has been recently proposed. MSCs are a heterogeneous population of multipotent elements resident in tissues such as bone marrow, muscle, and adipose tissue, which are primarily involved in developmental and regeneration processes, gaining thus increasing interest for tissue repair and restoration therapeutic protocols. Melatonin directly accelerated the differentiation of human stem cells into osteoblasts and also suggested that melatonin could be applied as a pharmaceutical agent to promote bone regeneration. Inflammatory cytokines and adipokines, proangiogenic/mitogenic stimuli, and other mediators that influence the differentiation processes may affect the survival and functional integrity of these mesenchymal precursor cells. In this scenario, melatonin seems to regulate signaling pathways that drive commitment and differentiation of MSC into osteogenic, chondrogenic, adipogenic, or myogenic lineages. Common pathways suggested to be involved as master regulators of these processes are the Wnt/β-catenin pathway, the mitogen-activated protein kinases and the, transforming growth factor-β signaling. In this respect, melatonin emerges a novel and potential modulator of MSC lineage commitment and adipogenic differentiation. This review recognizes and critically examines the available information on the effect of melatonin as a regulator of MSC differentiation and protection in different organs and tissues.","PeriodicalId":212982,"journal":{"name":"Journal of Dental Implants","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131221288","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Retention force of all-zirconia, all-polyetheretherketone, and zirconia-polyetheretherketone telescopic attachments for implant-retained overdentures: In vitro comparative study","authors":"Radwa Kamal Emera, Mohamed Elgamal, Gilan Y Altonbary","doi":"10.4103/jdi.jdi_4_20","DOIUrl":"https://doi.org/10.4103/jdi.jdi_4_20","url":null,"abstract":"Aim: The aim was to evaluate and compare retention forces of all-zirconia (ZrO2), all-polyetheretherketone (PEEK), and ZrO2-PEEK Computer-Aided-Designing computer-Aided -Manufacturing (CAD-CAM) telescopic attachments for two implant-retained mandibular overdentures. Materials and Methods: Fifteen identical acrylic resin models of the edentulous mandibular arch without alveolar undercuts were fabricated. Two implants were inserted in the canine region of each model. According to the material of telescopic attachment, models were divided into three groups: all ZrO2 (ZZ): primary and secondary crowns were made of ZrO2, all PEEK (PP): primary and secondary crowns were made of PEEK, and ZrO2-PEEK (ZP): primary crowns were made of ZrO2 and secondary ones were made of PEEK. Identical experimental overdentures were constructed for all models. For measuring the retention force, a universal testing machine was used to apply a pull-off test in presence of artificial saliva between the crowns. The achieved maximum values of retention force were recorded at the beginning of the study (initial retention) and after 540 cycles of insertion and removal simulating 6 months of the clinical service (final retention). Results were statistically analyzed, analysis of variance (P < 0.05). Results: ZP group reported the highest initial force values for all groups. The final retention values of PP and ZP groups were significantly decreased than initial values, while the insignificant loss of retention was observed with ZZ group (P = 0.06). Independent samples test showed a significant difference in both initial and final retentions between each two groups. Conclusion: Within the limitations of this study, ZrO2 is more preferred as a secondary telescopic crown against a primary ZrO2 one. Despite the loss of retention by time, PEEK can still be used as a secondary telescopic crown against ZrO2 or PEEK primary crowns regarding the acceptable initial and final retention values.","PeriodicalId":212982,"journal":{"name":"Journal of Dental Implants","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125252249","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Sinus augmentation in atrophic maxilla: Lateral window approach","authors":"Tejal Mavinkurve, P. Bhange","doi":"10.4103/jdi.jdi_19_20","DOIUrl":"https://doi.org/10.4103/jdi.jdi_19_20","url":null,"abstract":"Rehabilitation of edentulous posterior maxillary regions by means of implant placement often poses challenging situations due to inadequate alveolar ridge height and poor bone quality. Since resorption of posterior residual ridge is caused by sinus pneumatization or traumatic extractions, maxillary sinus floor elevation (SFE) and bone augmentation with graft materials remains the method of choice. This scientific, evidence-based, preprosthetic procedure is a corrective technique available for almost two decades in such surgically compromised cases. In this article, we will discuss and review instrumentation by lateral window approach for SFE in conjunction with bone augmentation for delayed implant placement postgraft maturation in the healing period.","PeriodicalId":212982,"journal":{"name":"Journal of Dental Implants","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121616846","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Customized healing abutment: An alternative technique for maintain peri-implant soft tissue and create implant crown emergence profile","authors":"R. Anchieta, W. Assunção, Isis Almela Endo Hoshino, E. Rocha","doi":"10.4103/jdi.jdi_7_20","DOIUrl":"https://doi.org/10.4103/jdi.jdi_7_20","url":null,"abstract":"The immediate load procedures in immediate implants have become routine in dental offices because of high esthetics demand by clients. Nevertheless, in some cases, it is not possible to perform immediate load procedures. The purpose of this article was describing the technique for creating a customized healing abutment to preserve the contours of peri-implant soft tissues and maximize peri-implant esthetics in immediate implants when it is not possible to place provisional crowns directly onto the implant. This technique is simple and easily performed and is an interesting alternative treatment for maintaining the stability of the peri-implant tissues while the osseointegration time.","PeriodicalId":212982,"journal":{"name":"Journal of Dental Implants","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129420743","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A comparative evaluation of changes in microbial flora in delayed and immediate placed implants: An in vivo study","authors":"Keerthi Hiremath, Viraj Patil, Zarir Ruttonji, Preethi Kusugal, K. Sushma, P. Astagi","doi":"10.4103/jdi.jdi_19_19","DOIUrl":"https://doi.org/10.4103/jdi.jdi_19_19","url":null,"abstract":"Background: Dental implants provide a unique opportunity for the observation of initial bacterial colonization and also for the estimation of time needed for the establishment of complex microflora. While many factors are important in determining the long-term success or failure of dental implants, very little is known about the relative importance of the subgingival bacterial populations around implants. Aim: The aim of the study was to estimate peri-implant microbial colonization in patients with immediate and delayed implants and the differences in peri-implant microflora between immediate and delayed implants. Materials and Methods: In the current study, the organisms found in the oral cavity prior to placing the implants and during the various stages of implant treatment in both the categories were assessed. Results: In the current study, organisms such as Streptococci are consistently seen. The presence of organisms such as Porphyromonas gingivalis and Fusobacterium, which have pathogenic potential, is of importance. Conclusion: In this study, the following conclusions were made; the mode of implant placement either immediate or delayed does not alter the peri-implant microflora. Organisms present preoperatively were consistently present during the entire phase of the treatment. This study suggests that regular microbial evaluation along with clinical and radiographic monitoring could help in recognizing the potential for peri-implantitis and in the prevention of the same for better prognosis.","PeriodicalId":212982,"journal":{"name":"Journal of Dental Implants","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116294188","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dental Implant Practice in the Post COVID-19 Era: Wading the Realities","authors":"S. Shetty","doi":"10.4103/jdi.jdi_15_20","DOIUrl":"https://doi.org/10.4103/jdi.jdi_15_20","url":null,"abstract":"","PeriodicalId":212982,"journal":{"name":"Journal of Dental Implants","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115789732","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Design and analysis of tooth abutment implant","authors":"S. Awasthi, V. Singh","doi":"10.4103/jdi.jdi_8_19","DOIUrl":"https://doi.org/10.4103/jdi.jdi_8_19","url":null,"abstract":"In human being, tooth loss is a common problem which may be due to various disease and trauma. Dental implants are used to provide support for the replacement of missing teeth. Research on dental implant designs, materials, and techniques is continuously increasing. There is still a lot of work involved in the use of better biomaterials, implant design, surface modification, and functionalization of surfaces to improve the long-term benefits of implant treatment. This paper provides a brief history of dental implants and its parts. This describes the new designs and conventional design of tooth abutment implant and stress distribution using finite element analysis method on the surface of the whole system under various loading conditions. It describes the suitable materials and its properties which can be used for making tooth abutment implant. This also describes how to remove complexities which is associated with tooth abutment implants such as its motion, complex design of screw, and high cost. Background: The attempts to overcome the problem of tooth loss and to find out a way of replacing missing teeth date back to as old as the history of human beings. Many materials, many geometric forms, surgical and prosthetic methods have been tried till now for the dental implants. Scarcely existing archeological reports demonstrate the attempts of different prosthetic devices used as natural and functional replacements. It is found that transplantation procedures and devices are used by Egyptians, Greeks, Romans, Chinese, Indians and Arabs. Furthermore naive artificial units such as shaped stone, wood, cast iron and carved sea shells, bone and natural teeth taken from various animals and even teeth sold by the poor or slaves have been tried as implantation material. A tooth shaped piece of shell is found by an archeologists which is placed into the socket of missing teeth of a women in 1931. Later, in 1970, a Brazilian dental academic, Amadeo Bobbio, investigated that mandibular specimen and in the radiographs he took, he observed bone formation around the implant-like structures. In 18th century, humans donated their teeth in exchange for some fee but human's body precluded the adaptation of foreign materials. Le Mayeur implanted one hundred and seventy donated teeth in 1785 and 1786 but he was not able to get successful results. In 19th century, predicating on a false assumption that precious materials would be well tolerated by biological tissues, gold, silver, platinum and some other metal alloys were used as implant materials, which resulted in extremely poor long-term results. The human's body reject these type of material basically because they were not inert. Venable et al. (1937) found that the metals that are not inert they tend to ionize when they come into contact with body resulting in producing metallic salts causing excessive proliferation of some tissues whereas inhibiting bone formation. The prevention of bone formation around the imp","PeriodicalId":212982,"journal":{"name":"Journal of Dental Implants","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122232471","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"An in vitro evaluation of microleakage in platform-switched implants at implant–abutment interface by contamination assessment of implant wells and respective abutment surfaces","authors":"V. Yamuna, R. Meshramkar, R. Kulkarni, M. Hosamani, K. Lekha, R. Nadiger, N. Chidambaram","doi":"10.4103/jdi.jdi_12_19","DOIUrl":"https://doi.org/10.4103/jdi.jdi_12_19","url":null,"abstract":"Background and Objectives: In contemporary implant dentistry, the success of implant treatment is assessed by measuring the crestal bone level apart from osseointegration. Peri-implant bone plays a vital role in the esthetics of implant restorations. With loss of peri-implant bone, soft tissue loss happens which eventually compromises the esthetics and mechanical properties of restorations. To prevent marginal bone loss, many inventions are made by modifying the implant designs, implant–abutment connections, and techniques. Platform-switched concept is one such invention evolved to prevent peri-implant bone loss. This beneficial effect of platform-switched implants was studied by many researchers. However, few studies were reported in the literature on microleakage in platform-switched implants. Thus, the purpose of this study is to evaluate microleakage at implant–abutment interface in platform-switched implants. Materials and Methods: Fifteen in-built platform-switched implants and corresponding abutments with internal hexagonal design were connected using screws. After the confirmation of the sterility of the implants and abutments, the assemblies were incubated in brain–heart infusion broth inoculated with Staphylococcus aureus for 14 days at 37°C. After 14 days, the implants and abutments were disassembled. Samples were collected from three different sites, i.e., walls of the wells of the implants, the deepest portion of the wells of the implants, and the surface of the abutments with help of paper points. Using the samples, colony counting and Gram staining were done to evaluate the microleakage at the implant–abutment interface. Results: Microbial contamination was found to be present at all the sites from which samples were collected.P < 0.05 was found when the different sites were compared with each other. The abutment surface found to have the least contamination, and the walls of the implant wells found to have the highest contamination. Conclusion: Within the limitations of this study, it was concluded that microleakage is present in the platform-switched implants with screw-retained internal hexagonal connections at the implant–abutment interface.","PeriodicalId":212982,"journal":{"name":"Journal of Dental Implants","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126975800","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comparative clinical evaluation of esthetic parameters of immediately provisionalized implants in the esthetic zone with their natural counterparts","authors":"V. Mahajan, R. Kshirsagar, Vikram Singh, S. Pawar","doi":"10.4103/jdi.jdi_18_19","DOIUrl":"https://doi.org/10.4103/jdi.jdi_18_19","url":null,"abstract":"Background: An anterior single implant-supported crown restoration in the maxillary anterior region must meet a particularly high standard of esthetic quality. The standard of care for edentulous space in esthetic zone therefore would be the placement of an implant with immediate provisionalization. Aims and Objecectives: The aim of this study is to evaluate the esthetic parameters of immediately provisionalized implants in the esthetic zone and compare patients opinion with blinded clinicians opinion of the outcome of esthetics of implant in esthtic zone. Materials and Methods: In our study, we placed 10 maxillary anterior single-tooth implants in fully healed maxillary anterior sites in esthetic zone. All the implants were provisionalized within 24 hours. Zirconia prosthesis was delivered as definitive prosthesis after three months of implant placement. The esthetic zone was photographed three months after delivering the definitive prosthesis. The esthetic outcome was then evaluated objectively using Pink Esthetic Score (PES) and White Esthetic Score (WES) by a blinded clinician. In addition, we used a triple score technique Visual Analogue Scale(VAS) wherein the patients commented on the soft tissue, prosthetic as well as the overall esthetic outcome. Results: A mean PES of 9.2± 1.03 and a mean WES of 8.7± 1.16 recorded showed an acceptable peri-implant soft tissue outcome and an acceptable prosthetic outcome respectively. The statistical analysis revealed statistically significant correlation between patients' esthetic perception and dentists' perception of the anterior tooth. Conclusion: The PES/WES is an objective tool in rating the esthetics of implant supported single crowns and adjacent soft tissues. Orthodontists were the most critical observers, while periodontists were more generous than other observers. The statistical analysis revealed a statistically significant correlation between patients' esthetic perception and dentists' perception of the anterior tooth.","PeriodicalId":212982,"journal":{"name":"Journal of Dental Implants","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126452263","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The effect of two regenerative surgical treatments for peri-implantitis defect using porous titanium granules alone and a combination of bovine bone mineral with collagen membrane: A systematic review","authors":"M. Qureshi, Nayana Anasane, Amit K Jagtap","doi":"10.4103/jdi.jdi_20_19","DOIUrl":"https://doi.org/10.4103/jdi.jdi_20_19","url":null,"abstract":"Implant success has broad definitions in clinical practice. Dental implant is becoming a common option for the replacement of lost teeth; there are various reasons for implant failure; one of them is peri-implantitis. This systematic review compares the two regenerative surgical treatment options for peri-implantitis. This systematic review was conducted to compare the effect of porous titanium granules and bovine bone mineral with the collagen membrane as a regenerative surgical treatment for peri-implantitis. A systematic search was performed in the PubMed database, Google Scholar, Institutional Library, and manual search of various journals. Cross-references were checked from relevant articles. Filters were put for the dates of publication from January 2000 to December 2016. Language restriction was put to English only. A total number of 367 articles were identified through the electronic search. Only six articles were included on the basis of inclusion and exclusion criteria. All the six articles were reviewed for the study characteristic. All the articles have shown good results when porous titanium granules and combination bovine bone mineral with collagen material was used to treat peri-implantitis. Porous titanium granules can be used as a regenerative surgical treatment for peri-implantitis; however, bovine bone mineral along with collagen membrane is a better regenerative treatment.","PeriodicalId":212982,"journal":{"name":"Journal of Dental Implants","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131588712","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}