Fixed Rehabilitation of Severely Atrophic Jaws Using Immediately Loaded Basal Disk Implants After In Situ Bone Activation

2012 ◽  
Vol 38 (5) ◽  
pp. 611-616 ◽  
Author(s):  
Guillaume Odin ◽  
Carl E Misch ◽  
Itzak Binderman ◽  
Gerard Scortecci
Keyword(s):  
Bone Graft ◽  
Graft Failure ◽  
Implant Surgery ◽  
The Future ◽  
Basal Disk ◽  
Fixed Prosthesis ◽  
Implant Bed ◽  
Second Chance ◽  
Functional Loading

Rehabilitation of severely atrophic jaws is facilitated when basal disk implants are used after activation of the future bony implant bed with a purpose-designed instrument (Osteotensor) 45 to 90 days before implant surgery. Fabrication of a highly rigid, screw-secured fixed prosthesis that acts as an external orthopedic fixator permits immediate functional loading. This protocol also represents a second chance for patients who have experienced complete implant loss and/or bone graft failure.

scholarly journals Versatility of the pedicled buccal fat pad flap for the management of oroantral fistula: a retrospective study of 25 cases

2019 ◽  
Vol 41 (1) ◽  
Author(s):  
Jinyoung Park ◽  
Byung-do Chun ◽  
Uk-Kyu Kim ◽  
Na-Rae Choi ◽  
Hong-Seok Choi ◽  
...  
Keyword(s):  
Bone Graft ◽  
Graft Failure ◽  
Fistula Closure ◽  
Fat Pad ◽  
Buccal Fat Pad ◽  
Dental Surgery ◽  
Female Ratio ◽  
Maxillary Bone ◽  
Oroantral Fistula

Abstract Purpose Maxillary bone grafts and implantations have increased over recent years despite a lack of maxillary bone quality and quantity. The number of patients referred for oroantral fistula (OAF) due to implant or bone graft failure has increased, and in patients with an oroantral fistula, the pedicled buccal fat pad is viewed as a robust, reliable option. This study was conducted to document the usefulness of buccal fat pad grafts for oroantral fistula closure. Materials and methods We retrospectively studied 25 patients with OAF treated with a buccal fat pad graft from 2015 to 2018. Sex, age, OAF location, cause, duration, presence of systemic disease, smoking, previous dental surgery, and side effects were investigated. Results A total of 25 patients were studied. Mean patient age was 54.8 years, and the male to female ratio was 19:6. Causes of oroantral fistula were cyst enucleation, tumor resection, implant removal, bone graft failure, and extraction. Excellent results were obtained in 23 (92%) of the 25 patients. In the other two patients that both smoked, a small fistula was observed during follow-up. No recurrence of oroantral fistula was observed after 2 months to 1 year of follow-up. Conclusions The incidence of oroantral fistula is increasing due to implant and bone graft failures. Oroantral fistula closure using a pedicled buccal fat pad was found to have a high success rate.

MixAR

2019 ◽  
Vol 12 (4) ◽  
pp. 1-33 ◽  
Author(s):  
Telmo Adão ◽  
Luís Pádua ◽  
David Narciso ◽  
Joaquim João Sousa ◽  
Luís Agrellos ◽  
...  
Keyword(s):  
Environmental Conditions ◽  
Mixed Reality ◽  
The Real ◽  
Points Of Interest ◽  
Real Scene ◽  
The Future

MixAR, a full-stack system capable of providing visualization of virtual reconstructions seamlessly integrated in the real scene (e.g. upon ruins), with the possibility of being freely explored by visitors, in situ, is presented in this article. In addition to its ability to operate with several tracking approaches to be able to deal with a wide variety of environmental conditions, MixAR system also implements an extended environment feature that provides visitors with an insight on surrounding points-of-interest for visitation during mixed reality experiences (positional rough tracking). A procedural modelling tool mainstreams augmentation models production. Tests carried out with participants to ascertain comfort, satisfaction and presence/immersion based on an in-field MR experience and respective results are also presented. Ease to adapt to the experience, desire to see the system in museums and a raised curiosity and motivation contributed as positive points for evaluation. In what regards to sickness and comfort, the lowest number of complaints seems to be satisfactory. Models' illumination/re-lightning must be addressed in the future to improve the user's engagement with the experiences provided by the MixAR system.

scholarly journals In Situ Forces in the Anteromedial and Posterolateral Bundles of the Anterior Cruciate Ligament under Simulated Functional Loading Conditions

2010 ◽  
Vol 38 (3) ◽  
pp. 558-563 ◽  
Author(s):  
Jia-Lin Wu ◽  
Jong Keun Seon ◽  
Hemanth R. Gadikota ◽  
Ali Hosseini ◽  
Karen M. Sutton ◽  
...  
Keyword(s):  
Anterior Cruciate Ligament ◽  
Cruciate Ligament ◽  
Loading Conditions ◽  
Anterior Cruciate ◽  
Functional Loading

scholarly journals Immediate Implant Placement in Infected Sockets: A Consecutive Cohort Study

2020 ◽  
Vol 11 (2) ◽  
pp. 167-173 ◽  
Author(s):  
Ashish Kakar ◽  
Kanupriya Kakar ◽  
Minas D. Leventis ◽  
Gaurav Jain
Keyword(s):  
Bone Graft ◽  
Clinical Results ◽  
Bone Graft Substitute ◽  
Graft Material ◽  
Success Rates ◽  
Implant Surface ◽  
Implant Placement ◽  
Immediate Placement ◽  
Immediate Implant

Introduction: Immediate placement of implants in a fresh post-extraction socket is an increasingly popular and established treatment option. However, active infection in the extraction site may adversely affect the outcome of this procedure. This study was designed to assess the clinical results of immediate placement of dental implants in infected extraction sockets using a standardized protocol, which included (a) the use of an Er,Cr:YSGG laser for the decontamination of the infected socket prior to implant insertion, and (b) the utilization of an in situ hardening alloplastic bone graft substitute to augment the gap between the implant surface and the labial plate of bone. Patients and Methods: A retrospective record review was used to identify 68 patients who had implants placed as per the described protocol. A total of 126 implants were placed in 68 patients (65 implants in the maxilla, 61 implants in the mandible). The implants were loaded 136 ± 73 days (mean ± standard deviation; range: 37–400 days) after implant placement. Eight patients (16 implants) were subsequently lost to follow up. Results: 105 of the 110 implants (95.45%) placed immediately in the infected sites using the described protocol survived after prosthetic loading. Conclusion: Immediate implant placement in previously infected sites using the protocols mentioned in our study with laser decontamination of the socket, grafting with an in situ hardening alloplastic bone graft material and non-submerged healing shows a similar survival rate to the published success rates for immediate implants placed in non-infected sites.

Development of hydroxyapatite-mediated synthesis of collagen-based copolymers for application as bio scaffolds in bone regeneration

2014 ◽  
Vol 1621 ◽  
pp. 53-58
Author(s):  
Didarul Bhuiyan ◽  
John Middleton ◽  
Rina Tannenbaum
Keyword(s):  
Mechanical Properties ◽  
Bone Graft ◽  
In Situ Polymerization ◽  
Bone Graft Substitute ◽  
The Body ◽  
Graft Material ◽  
Novel Approach ◽  
Absorbable Polymers ◽  
Biocomposite Material

ABSTRACTHydroxyapatite (HAP) is a biocompatible bio-ceramic whose structure and composition is similar to bone. However, its lack of strength and toughness have seriously hampered its applications as a bone graft substitute material. Attempts have been made to overcome these mechanical properties deficiencies by combining HAP bioceramic material with absorbable polymers in order to improve its mechanical properties. However, poor interfacial bonding between the HAP and the polymers has limited the benefits of such biocomposite structures. At the other end of the biomaterials spectrum is collagen, which constitutes the most abundant proteins in the body and exhibits properties such as biodegradability, bioadsorbability with low antigenicity, high affinity to water, and the ability to interact with cells through integrin recognition. These favorable properties renders collagen as a natural candidate for the modification and compatibilization of the polymer-HAP biocomposite. In this study, we developed a novel approach to the synthesis of a potential bone graft material, where the HAP moiety acts not only as a bioceramic filler, but also constitutes the initiator surface that promotes the in-situ polymerization of the adsorbable polymer of choice. The synthesis of poly(D,L-lactide-co-glycolide) (PLGA) polymer was catalyzed by nano-hydroxyapatite (nHAP) particles and upon reaction completion, the biocomposite material was tethered with collagen. The synthesis was monitored by 1H NMR and FTIR spectroscopies and the products after each step were characterized by thermal analysis to probe both thermal stability, morphological integrity and mechanical properties.

The Future of Sustainable utilization of resources on the Moon: a new international legal regime?

2020 ◽  
Author(s):  
Diego De Blasi
Keyword(s):  
Natural Resources ◽  
Outer Space ◽  
Critical Issue ◽  
Sustainable Utilization ◽  
The Moon ◽  
The Future ◽  
Celestial Bodies ◽  
Lunar Environment ◽  
Space Activities

<p>Outer space activities are increasingly bringing the international (scientific) community to upper stages of knowledge and awareness. With particular reference to <strong>Lunar exploration</strong>, general involvement of all States (also within a context of public-private partnerships initiatives) towards <strong>the principle of sustainable utilization of lunar resources</strong> shall represent an important requirement for the future of all Mankind</p><p><br>Thus, the <strong>safeguarding of lunar environment</strong> (the equitable/intragenerational utilization of its resources) shall represent a critical issue for the whole evolutionary framework of the <em>Corpus Iuris Spatialis</em></p><p>Firstly, the principle herein shall be taken into examination under the provisions laid down in the A<em>greement governing the Activities of States on the Moon and other Celestial Bodies.</em> Accordingly, article 11 states <em>“the moon and its natural resources are the common heritage of mankind”[..]; as well, “The moon is not subject to national appropriation by any claim of sovereignty, by means of use or occupation, or by any other means..” (paragraph 2)</em></p><p><em> </em><br>Secondly, other concerns may also take into account: a)<strong> the perspective of ISRU (in situ resources utilization) processes</strong>, which shall take place towards sustainability means b) the undertaking of well balanced measures in exploring and using natural resources <em>vis-à-vis</em> adverse changes in lunar environment <em>(article 7, par. 1, Moon Treaty)</em>. In addition, besides the terms pursuant to the establishment of peaceful use of (space) lunar activities, an adequate <em>consensus</em> shall be called upon States beyond the <em>status quo</em></p><p>  <br>In conclusion, the aferomentioned background shall also consider the adoption of a comprehensive <em><strong>Additional Protocol to the Moon Treaty</strong></em> concerning <em>the sustainable utilization of lunar resources</em>. Arguably, this progressive framework may also be welcomed as milestones towards <em>further legal developments in international space law </em></p><p> </p><p> </p>

Evaluating model-simulated and satellite-derived SM using in situ observations under different environment conditions in China

2020 ◽  
Author(s):  
Yuanyuan Wang ◽  
Guicai Li
Keyword(s):  
Land Surface ◽  
Large Scale ◽  
Microwave Remote Sensing ◽  
Ground Truth ◽  
Original Data ◽  
Observation Data ◽  
Monitoring Networks ◽  
The Future ◽  
In Situ Observations

<p>Soil moisture (SM) is a key variable in understanding the climate system through its controls on the land surface energy and water budget. Large scale SM products have become increasingly available thanks to development in microwave remote sensing and land surface modeling. Comprehensive assessments on the reliability of satellite-derived and model-simulated SM products are essential for their improvement and application. In this research, the active, passive and combined Climate Change Initiative (CCI V04.2) SM products and the China Land Data Assimilation System (CLDAS V2.0) SM products were evaluated by comparing with in situ observed data over three networks in China: Hebi, Naqu and Heihe. The three sites have different environmental conditions and sensor densities, providing observations covering more than 2 years. Four statistic scores were calculated: <em>R</em> (considering both original data and anomalies), <em>Bias</em>, <em>RMSE</em>, <em>ubRMSE</em>. TC (Triple Collocation) analysis was also carried out in which uncertainties in observations are taken into account. Results indicate that the performance of the two SM products varies between the monitoring networks. For Naqu site, both products show good performance, with CCI-SM showing slightly higher <em>R</em> and lower <em>ubRMSE</em>. For Hebi site, CLDAS-SM performs better than CCI-SM, whereas for Heihe site, CLDAS-SM performs worse than CCI-SM. The expected uncertainty (0.04 m<sup>3</sup>/m<sup>3</sup>) can be achieved in Naqu and Heihe site by CCI-SM, and in Hebi and Naqu site by CLDAS-SM, which is quite encouraging. The two products agree in terms of sign of the <em>Bias</em> value, which is positive in Hebi and negative in Naqu and Heihe. Among all the three networks, Heihe site exhibits the lowest accuracy due to its complicated terrain and heterogeneous land surface.<em> R<sub>anom</sub></em> of CLDAS-SM in Heihe is close to 0, indicating its inability to capture short term variability. TC results reveal that for Naqu site the observation data have quite good qualities, while for Hebi site CLDAS-SM is more approximate to ‘ground truth’ than in situ observations, suggesting a refinement of network maybe needed in the future. Overall, the two products are complementary. CLDAS-SM performs better in populated area (e.g., Hebi) where meteorological forcing is more accurate and CCI-SM performs better in remote areas (Naqu, Heihe) where RFI is usually low. More reliable validation networks are needed in the future to comprehensively understand the advantages and disadvantage of the two SM products in China.</p>

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