Journal of Osseointegration最新文献

{"title":"Influence of implant connection on the stress distribution in restorations performed with hybrid abutments","authors":"Jpm Tribst, A. D. Piva, L. Anami, A. Borges, M. Bottino","doi":"10.23805/JO.2019.11.03.08","DOIUrl":"https://doi.org/10.23805/JO.2019.11.03.08","url":null,"abstract":"Aim This study evaluated the influence of prosthetic connection type (external hexagon [EH], internal hexagon [IH] and morse taper [MT]) on the stress distribution in an implant-supported prosthesis. \u0000Materials and methods Using modeling software, three sets were formed according to the prosthetic connection composed of ceramic crown, mesostructure, abutment, abutment screw, implant, cement layers and bone tissue. Solids were imported to the analysis software and bone model was fixed in the base. All materials were considered isotropic, linearly elastic and homogeneous. The static load (500 N, 30°) was applied in the central fossa. Stress distribution data were obtained according to Von-Mises and microstrain criteria. \u0000Results The type of prosthetic connection influenced the stress distribution. The stresses for the IH and MT connections were concentrated on the implant and abutment; for EH at the implant, abutment screw, at the implant platform, and at the cement layer between abutment and mesostructure. There is lower influence for the crown and mesostructure, with more promising results for the MT connection. For the bone tissue, all connections showed the same strain pattern. Stress peaks of 148, 142 and 138 MPa in the implant, 134, 129 and 62 MPa in the screw, and 86, 118 and 131 MPa were observed respectively for EH, IH and MT. \u0000Conclusions The morse taper connection showed promising performance with lower stress concentration in the abutment screw, implant platform and cement layers.","PeriodicalId":42724,"journal":{"name":"Journal of Osseointegration","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2019-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80843772","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":"Surgical procedures performed to improve the prosthetic prognosis in case of maxillary defects: a review of the literature","authors":"G. Ruggiero, N. Bocca, G. Magrini, A. D'addona, M. Carossa, G. Gassino","doi":"10.23805/JO.2019.11.03.09","DOIUrl":"https://doi.org/10.23805/JO.2019.11.03.09","url":null,"abstract":"Aim The purpose of this review is to address the surgical procedures that need to be followed to obtain a maxillary defect that can be suitable to receive a prosthesis. \u0000Methods An extensive search of the literature was performed, on the databases of PubMed/Medline and Scopus, in addition to congress proceedings and books, written in English or Italian. Literature search was performed using combinations of the following keywords: (“obturator prognosis” OR “palatal obturator” OR “obturator prosthesis” OR “prosthetic prognosis”) AND (“maxillectomy” OR “maxillary defect”). \u0000Results 35 articles, 2 books and 3 congress proceedings were included. After the study of the records included in this review, it was found that surgeon must preserve the anterior maxilla as much as possible, because it is the most suitable site for the placement of implants. Furthermore, if the implant site is involved in post-operative radiotherapy, it is advisable to know the x-ray dose of such an exposition. The surgical cut should preserve mucosa and bone support around the tooth adjacent to the defect, and keratinized mucosa should cover the palatal margin of the defect Equally important is to prepare an adequate access to the defect, because the turbinates and the bands of oral mucosa may prevent the prosthesis from engaging key areas of the defect, impairing function. \u0000Conclusion A complete knowledge about the construction techniques and biological/mechanical principles of maxillofacial prosthesis is essential to perform surgical interventions that enhance the prosthetic prognosis.","PeriodicalId":42724,"journal":{"name":"Journal of Osseointegration","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2019-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81944943","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 literature review on progressive loading","authors":"A. Buenaventura, M. Villanueva, J. Montoya, G. M. Azpur","doi":"10.23805/JO.2019.11.03.07","DOIUrl":"https://doi.org/10.23805/JO.2019.11.03.07","url":null,"abstract":"Aim The planning of implant-supported dentures can become complex when the patient has low or poor quality of bone. Some studies suggest that excessive functional load or traumatic occlusion over dental implants placed in bone of poor quality and density  may cause marginal bone loss and increase implant failure rate. In 1980, Misch proposed the progressive loading of a dental implant. A protocol that may produce a lower crestal bone loss compared to the conventional loading protocol, as well it may increase bone density in poor quality areas.  The aim of this review of the literature was to update and summarize the progressive loading protocol and to describe its benefits and its possible effect on dental implant success. \u0000Methods The following combinations of controlled terms (MeSH) and keywords were used: (“progressive loading”[All Fields] OR “progressive bone loading”[All Fields] OR “progressive bone load”[All Fields] OR “progressive load”[All Fields]) AND (“dental implants”[MeSH Terms] OR “dental implant”)  \u0000Conclusion Within the limitations of this study, all authors concluded that PL produces less crestal bone loss and trends to high bone density around dental implants. Authors also support the idea that PL may stimulate bone growth and maturation and offer benefits in bone quality and density and suggest the use of gradual loading especially in bones with low density.","PeriodicalId":42724,"journal":{"name":"Journal of Osseointegration","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2019-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88336323","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":"Use of monolithic lithium disilicate for implant abutment and crown: a clinical report","authors":"N. Mobilio, S. Catapano","doi":"10.23805/JO.2019.11.03.06","DOIUrl":"https://doi.org/10.23805/JO.2019.11.03.06","url":null,"abstract":"Background Lithium disilicate is usually used for producing prosthetic crowns to be cemented on teeth or implant abutments. On the contrary, its use for producing implant abutment is not reported. This report describes the use of monolithic lithium disilicate to realize implant abutment and crown. \u0000Case report A 60-year-old male patient required dental implant restoration for replacing the upper right central incisor. A lithium disilicate abutment and crown were realized by pressing. \u0000Conlusion Lithium disilicate may be a valid alternative to zirconia for producing implant abutments in the esthetic area.","PeriodicalId":42724,"journal":{"name":"Journal of Osseointegration","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2019-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88028909","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":"Effects of bioactive additions on the physical properties of glass polyalkenoate cement","authors":"A. Qutieshat, A. Salem","doi":"10.23805/JO.2019.11.03.05","DOIUrl":"https://doi.org/10.23805/JO.2019.11.03.05","url":null,"abstract":"Aim Conventional glass ionomer cements are clinically attractive materials and have unique properties that make them useful dental restorative materials. The glass ionomer cements however are slightly brittle materials though they deform a little under load. They display high compressive strengths but slightly weak flexural strengths. Collagen type I and RGD peptides (Arg-Gly-Asp) are the most effective and widely used bioactive molecules to promote cell adhesion on a synthetic surface. This study investigates the effect of chairside addition of bioactive molecules (Collagen type I and RGD) into glass polyalkenoate cement on improving the physical properties. \u0000Materials and methods Mechanical properties of the glass polyalkenoate cement (ChemFil Superior, Dentsply De Trey, Konstanz, Germany) were investigated both at baseline and after incorporating bioactive additions made at the time of mixing the material. The properties that are of potential significance for clinical durability were determined namely; compressive strength, diametral compressive strength, three-point flexural strength, diametral compressive fatigue limit, and biaxial flexural strength. Results: Additions of Type I Collagen and RGD to ChemFil Superior improved all physical properties measured except shear bond strength where no detriment was observed. \u0000Conclusion Chairside additions of bioactive molecules to conventional glass ionomer restorations have potential clinical applications and represent a new paradigm in dentistry that can be utilized to improve biocompatibility, mechanical properties, and therefore, clinical durability. Improving the mechanical strength of glass ionomer restorations by optimized reinforcement strategy requires further investigation. Clinical significance: the methodology of mixing conventional glass ionomer with bioactive molecules for superior biocompatibility and reinforcement, developed in the present study, should be applicable to chairside dental procedures. The increase in physical properties of the glass polyalkenoate, achieved in the present study, may help extend its dental applications to the restoration of stress-bearing cavities.","PeriodicalId":42724,"journal":{"name":"Journal of Osseointegration","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2019-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76740829","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":"Feline dental implants: new paradigm shift in maxillary alveolar osteitis treatment planning with osseodensification","authors":"Rocco E Mele, G. Kurtzman","doi":"10.23805/JO.2019.11.03.04","DOIUrl":"https://doi.org/10.23805/JO.2019.11.03.04","url":null,"abstract":"Background Felines are obligate carnivores and use their teeth for prehending as well as tearing and dissecting their food. Mastication is the first step of digestion, aiding in the lubrication of the food and the formation of a bolus. Mastication also increases the surface area of the food to be initially digested by salivary enzymes before being more easily swallowed. The teeth are specialized structures which play an important role in mastication, grooming, supporting the lips and the tongue, as well as being used as weapons for hunting and for self-defense. Although some mammals can still survive with few or no teeth at all, cats included, losing teeth can influence the types of foods that can be eaten, and will affect the ability to masticate and processing of the food prior to swallowing. Dental implants have become an option for replacement of lost canines in these animals. Although cats appear to manage well after a canine extraction, complications such as lip entrapment can occur, especially after maxillary canine tooth extraction. \u0000Even cats with a complicated crown fracture of the maxillary canine tooth that have had root canal therapy to preserve the tooth, can still suffer from lip entrapment. This can lead to painful lip ulcers and the need for further dental treatment. Today, canine tooth replacement with a dental implant/crown is a predictable option that can be offered to clients who would like to replace a lost canine tooth. \u0000Case report  Two long term cases and follow up of lost maxillary canines caused by alveolar osteitis and replacement by dental implants, to restore normal function in feline subjects are reported. \u0000Conclusion Dental implants proved to be a viable long-term treatment option in the 2 cats described.Immediate implant placement at the time of extraction helps to maintain the surrounding bone structures and prevent collapse of the labial buccal plate. So far, the authors have placed 30 implants in 15 feline subjects up to a 3-year follow-up and no integration failures have been observed to date.","PeriodicalId":42724,"journal":{"name":"Journal of Osseointegration","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72735711","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 mechanical complications of platform switching connection on implant supported restorations: A systematic review and meta-analysis","authors":"A. Salama, H. Katamish, C. Halim, K. Farid","doi":"10.23805/JO.2019.11.03.03","DOIUrl":"https://doi.org/10.23805/JO.2019.11.03.03","url":null,"abstract":"Aim Platform implant abutment connection proved success in preserving crestal bone around implants, but the increased stress concentration on the prosthetic components is still a question.The primary aim of this systematic review was to evaluate the available evidence on the mechanical effect of implant platform switching concept on implant prosthetic components. \u0000Methods A protocol of electronic and hand research was performed for English based researches comparing one or more PS groups with one or more PM groups to develop an answer for the following question: “Will the platform switching technique affect the amount of stresses generated within implant prosthetic components causing mechanical complications? A meta-analysis was performed to evaluate the impact of implant-abutment platform mismatch on implant prosthetic components. \u0000Results Eleven publications from twenty research studies were included. Results from the meta-analysis demonstrated the odds of survival in the Platform matching connection arm are 2.13 times more compared to the Platform switching arm.  (P-value= 0.0316) For the random effects model, the odds of survival in the PS arm is not statistically significantly different compared to the PM arm (p-value= 0.2224) due to substantial heterogeneity of the included studies results in regards to implant prosthetic components mechanical complications. \u0000Conclusion This systematic review showed higher stress concentration in the implant prosthetic components regarding using platform switched implants, more randomized controlled clinical trials with bigger samples are needed to confirm our findings, but the current evidence demonstrates that non-significant differences between platform switching concept and platform matching. It is recommended to further investigate the mechanical complications that might arise when platform switching concept is used.","PeriodicalId":42724,"journal":{"name":"Journal of Osseointegration","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2019-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73171994","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":"Alternative solution for mandible rehabilitation: fixed full arch prosthesis on short implant, a randomized cohort study","authors":"G. Petroni, A. Passaretti, M. Marincola, G. Pompa, A. Cicconetti","doi":"10.23805/JO.2019.11.03.02","DOIUrl":"https://doi.org/10.23805/JO.2019.11.03.02","url":null,"abstract":"Aim The aim of this study was to evaluate a surgical/prosthetic protocol for the rehabilitation of edentulous mandible with four short implants and a metal-free fixed prosthesis. \u0000Materials and methords Study design: ten patients with mandibular edentulism were enlisted into the study. Four short implants (4x5 mm) were inserted. After four months, the implants were uncovered and a metal-free prosthesis was designed using a substructure made from a fiber-reinforced composite (Trinia TM, Bicon LLC, Boston, MA) and denture teeth. Follow-up visits were scheduled at 6, 12, 24, and 36 months after prosthetic loading. \u0000Results At the end of follow-up, an implant success rate of 95% was recorded. No significant effect over time on mean bone level variation (expressed as percentage of variation compared to  baseline value) was observed, with an average bone loss of -0,47 mm ± 0.64 mm. In addition, no worsening of periodontal indexes examined and prosthetic complications were noted. Parameters of patient perception examined revealed a good level of satisfaction (score range 6-9, out of a 0-10 score scale). \u0000Conclusions These data highlight the potential of the technique as an alternative solution to limit additional preprotesic surgery and to perform atraumatic and conservative treatment in case of atrophic jaws.","PeriodicalId":42724,"journal":{"name":"Journal of Osseointegration","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2019-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79094900","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":"Implant-supported prosthesis for marginal mandibulectomy: a case report","authors":"Ruchi Kalra, R. Hegde, M. Shetty","doi":"10.23805/JO.2019.11.03.01","DOIUrl":"https://doi.org/10.23805/JO.2019.11.03.01","url":null,"abstract":"Background. This case report describes the prosthetic rehabilitation of a patient who underwent mandibulectomy, with the help of osseointegrated dental implants. \u0000Case report. A 22-year old female patient came to the observation following segmental resection of the mandible owing to an odontogenic myxoma requesting implant-suppoterd prosthetic rehabilitation. \u0000Conclusion.  The use of endosseous implants for supporting the prosthesis is viable treatment plan when the residual anatomy is not capable of fulfilling the functions of retention, stability and support.","PeriodicalId":42724,"journal":{"name":"Journal of Osseointegration","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2019-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81299293","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":"Surgical-prosthetic rehabilitation of patients with aggressive periodontitis and immediately loaded implants: a report of two cases","authors":"J. Collins, R. Lalane, G. Ogando, M. Nasser, G. Romanos","doi":"10.23805/JO.2019.11.02.06","DOIUrl":"https://doi.org/10.23805/JO.2019.11.02.06","url":null,"abstract":"Background Treatment with dental implants is demonstrated to be a predictable procedure to replace lost or defective teeth in patients with a history of chronic and aggressive periodontitis. Although the dental implants are less successful in compromised patients compared to uncompromised patients. \u0000Case report In this report, two  cases are described of Generalized Aggressive Periodontitis (GAgP) treated with multidisciplinary management and a two-year follow-up. The two patients received periodontal and prosthetic treatment with immediately loaded implants using a supported surgical computer-planned guide. Dental implants were inserted by means of a flapless procedure, and immediate provisionalizations were put into place. The survival of the implants was evaluated by clinical and radiographic means after two years. Minimal pain and edema on the surgical site were observed. \u0000Conclusion The 2 case reports support the benefits of immediate loading with provisional implant-retained fixed prostheses in patients with GAgP.","PeriodicalId":42724,"journal":{"name":"Journal of Osseointegration","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2019-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80557614","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}