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Enrico F Gherlone, Gianpaolo Sannino, Andrea Rapanelli, Roberto Crespi, Giorgio Gastaldi, Paolo Capparé
Objectives: The aim of this clinical study was to evaluate a new type of prefabricated bar system, supported by axial and tilted implants at 5-year follow-up. Materials and Methods: Twenty-nine consecutive participants (19 females, 10 males) (mean age 61.4 years), edentulous in one or both jaws, with severe atrophy of the posterior regions, were treated according to the All-on-four® protocol with immediately loaded axial (64) and tilted (64) implants supporting complete-arch screw-retained prostheses (12 maxillary, 20 mandibular) featuring a prefabricated bar as framework...
2018: BioMed Research International
G Falisi, S Bernardi, C Rastelli, D Pietropaoli, F DE Angelis, M Frascaria, C DI Paolo
Objectives: Short implants are increasing their popularity among clinicians who want to fulfill the constant demanding of fixed prosthetic solutions in edentulous jaws. The aim of this report was to propose a new possibility to project and realize an occlusal guided implant cross-arch prosthesis supported by ultra-short implants, describing it presented an edentulous mandible case report. Methods: A 61-year-old, Caucasian, female patient who attended the dental clinic of the University of L'Aquila presented with edentulous posterior inferior jaw and periodontitis and periimplantitis processes in the anterior mandible...
October 2017: Oral & Implantology
Jose Luis Calvo Guirado, Aldo Fabian Lucero-Sánchez, Ana Boquete Castro, Marcus Abboud, Sergio Gehrke, Manuel Fernández Dominguez, Rafael Arcesio Delgado Ruiz
The aim of this study was to evaluate the soft tissue thickness and marginal bone loss around dental implants with sloped micro-threaded shoulder (35° angle) in comparing with conventional design, inserted 35° degrees angulated in post extraction sockets and immediate loaded with temporary prosthesis simulating the all-on-four protocol. Materials and Methods: Six fox hound dogs received forty-eight post extraction dental implants with the same diameter and length (Medentika, Germany), but with different neck configurations...
January 12, 2018: Materials
Todd E Shatkin, Alysa Brooke Sadkin, Jared Shatkin
No abstract text is available yet for this article.
May 2017: Dentistry Today
Tsutomu Sugiura, Kazuhiko Yamamoto, Satoshi Horita, Kazuhiro Murakami, Tadaaki Kirita
BACKGROUND: Excessive micromotion may cause failure of osseointegration between the implant and bone. PURPOSE: This study investigated the effects of implant configuration, bone density, and crestal cortical bone thickness on micromotion in immediately loaded mandibular full-arch implant restorations. MATERIALS AND METHODS: A finite element model of the edentulous mandible was constructed. Four implants were inserted in two different configurations, which were four parallel implants or tilted distal implants according to the all-on-four concept...
February 2018: Clinical Implant Dentistry and related Research
P Guennal, J Guiol
Zygomatic implants can be used for dental rehabilitation in atrophic maxillae. This allows for maxillary grafts to be avoided while also permitting immediate functional use. Initially, the implants had a palatal emergence. The surgical technique has undergone continuous development and the implants are now sometimes extra-maxillary in order to better match with the prosthetic space. The main risk is vestibular exposure of the implant as a gingival recession caused by mucositis or peri-implantitis. When the first patients exhibited this problem, the authors sought a solution in order to prevent this complication from occurring...
April 2018: Journal of Stomatology, Oral and Maxillofacial Surgery
Hugo E Peixoto, Paulo R Camati, Fernanda Faot, Bruno S Sotto-Maior, Elizabeth F Martinez, Daiane C Peruzzo
OBJECTIVE: The aim of this study was to analyze whether the use of inclined short implants without lower transcortical involvement (test model - SI), thus preserving the mandibular lower cortical bone, could optimize stress distribution. MATERIALS AND METHODS: Six identical atrophic mandible models were created featuring 8mm of height at the symphysis. Two study factors were evaluated: implant length and angulation. Implant length was represented either by short implants (7mm) with preservation of the mandibular lower cortical bone or standard implants (9mm) with a bicortical approach and 3 possible implant positioning configurations: 4 distally-inclined implants at 45° (experimental model), all-on-four, 4 vertical implants...
November 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
Lin Ye
The development of clinical implant dentistry was intensively affected by dental implant design improvement and innovation, which brought about new concept, even milestone-like changes of clinical protocol. The current improvements of dental implant design and their clinical importance could be highlighted as followings: 1) The implant apical design influences the implant preliminary stability in immediate implant. The apical 3-5 mm design of implant makes implant stable in immediate implant, because this part would be screwed into alveolar bone through fresh socket, the other part of implant could not be tightly screwed in the socket because of smaller implant diameter...
February 1, 2017: Hua Xi Kou Qiang Yi Xue za Zhi, Huaxi Kouqiang Yixue Zazhi, West China Journal of Stomatology
Mustafa Ayna, Aydin Gülses, Yahya Acil
The study aims to document the clinical outcomes over a 7-year period of two techniques used for the rehabilitation of edentulous mandibles according to the "All-on-Four™" concept: (1) fixed complete-arch prostheses fabricated with metal-ceramic implant-supported fixed prosthesis with a titanium framework and all-ceramic crowns and (2) bar-retained implant-supported removable prosthesis with acrylic resin prosthetic teeth. The study was performed on 32 patients who received immediately loaded "All-on-Four™" fixed mandibular prostheses...
January 2018: Odontology
David Soto-Penaloza, Regino Zaragozí-Alonso, María Penarrocha-Diago, Miguel Penarrocha-Diago
OBJECTIVES: To systematically review the literature on the "all-on-four" treatment concept regarding its indications, surgical procedures, prosthetic protocols and technical and biological complications after at least three years in function. STUDY DESIGN: The three major electronic databases were screened: MEDLINE (via PubMed), EMBASE, and the Cochrane Library of the Cochrane Collaboration (CENTRAL). In addition, electronic screening was made of the 'grey literature' using the System for Information on Grey Literature in Europe - Open Grey, covering the period from January 2005 up to and including April 2016...
March 2017: Journal of Clinical and Experimental Dentistry
Panos Papaspyridakos, Yong-Jeong Kim, Matthew Finkelman, Khaled El-Rafie, Hans-Peter Weber
PURPOSE: The primary aim of this study was to assess the accuracy of different splinting materials to make implant cast verification jigs. The secondary aim was to assess the effect of 20° implant angulation on the accuracy of casts. MATERIALS AND METHODS: An edentulous mandibular arch with five internal connection tissue level implants served as control. The three implants in the anterior region were parallel to each other and the two implants in the posterior region were distally tilted 20° bilaterally...
April 2017: Journal of Esthetic and Restorative Dentistry
Satoshi Horita, Tsutomu Sugiura, Kazuhiko Yamamoto, Kazuhiro Murakami, Yuichiro Imai, Tadaaki Kirita
PURPOSE: The purpose of this study was to investigate the biomechanical behavior of immediately loaded implants in an edentulous mandible according to the "All-on-Four" concept. METHODS: A 3D-finite element model of an edentulous mandible was constructed. Four implants were placed between the bilateral mental foramen according to "All-on-Four" concept. A framework made of titanium or acrylic resin between the bilateral first molars was modeled. Immediate loading and a delayed loading protocol were simulated...
April 2017: Journal of Prosthodontic Research
Cláudia Lopes Brilhante Bhering, Marcelo Ferraz Mesquita, Daniel Takanori Kemmoku, Pedro Yoshito Noritomi, Rafael Leonardo Xediek Consani, Valentim Adelino Ricardo Barão
We evaluated two treatment concepts for the rehabilitation of moderate atrophic maxilla with dental implants (all-on-four and all-on-six) and the effect of framework material on the stress distribution of implant-support system. A three-dimensional finite element model based on a prototype was built to simulate an entirely edentulous maxilla with moderate sinus pneumatization that was rehabilitated with a full-arch fixed dental prosthesis. Four standard implants were positioned according to the all-on-four concept and four standard implants and two short implants were placed according to the all-on-six concept...
December 1, 2016: Materials Science & Engineering. C, Materials for Biological Applications
Kelvin I Afrashtehfar
Data sourcesMedline, the Cochrane Library, Google and hand-searches of systematic reviews and bibliographies from related journals in English and German up to August 2012.Study selectionThree reviewers independently searched for clinical trials that assessed the success rates of placing two anterior and two posterior tilted dental implants in humans either in the maxilla or mandible according to the all-on-four treatment concept. Inclusion limited studies with a minimum follow-up period of one year.Data extraction and synthesisThe primary outcome measure was the failure rate of implants...
2016: Evidence-based Dentistry
Charles A Babbush, Ali Kanawati, Georgios A Kotsakis
PURPOSE: To longitudinally evaluate marginal bone remodeling around tapered, platform-shifted implants placed for total arch rehabilitation with fixed hybrid prostheses. MATERIALS AND METHODS: A retrospective cohort study was designed that evaluated radiographic data from patients undergoing implant surgical procedures with an immediately loaded four-implant-supported fixed prosthetic concept in a single clinic setting during a 36-month period. The primary outcome variable was the change in marginal bone levels during a 12- to 36-month follow-up postloading with the definitive prosthesis...
May 2016: International Journal of Oral & Maxillofacial Implants
Hakimeh Siadat, Marzieh Alikhasi, Elaheh Beyabanaki, Susan Rahimian
PURPOSE: The aim of this in vitro study was to compare the accuracy of two different impression techniques for the All-on-Four implant therapy protocol. MATERIALS AND METHODS: An acrylic resin analog for an edentulous maxilla with four internal connection implants (Replace Select, Nobel Biocare) was fabricated according to the All-on-Four protocol. A total of 40 impressions were made with different techniques (open and closed tray) at abutment and implant levels and poured in type IV dental stone...
May 2016: International Journal of Prosthodontics
Gianpaolo Sannino, Alberto Barlattani
PURPOSE: The aim of this study was to evaluate and compare the use of straight versus angulated abutments on tilted implants in the All-on-Four immediate function protocol. MATERIALS AND METHODS: A total of 85 patients (36 men and 49 women; mean age 56.5 years) with edentulous mandibles were treated according to the All-on-Four concept using computer-guided implant placement. All patients received immediate interim prostheses screwed onto distal tilted implants by means of angulated (control group, n = 42) or straight abutments (test group, n = 43) and were followed for at least 3 years...
May 2016: International Journal of Prosthodontics
Bei Bei Li, Jia Bin Xu, Hong Yan Cui, Ye Lin, Ping Di
The aim of this study was to assess the effects of partial carbon or glass fiber reinforcement on the flexural properties of All-on-Four provisional fixed denture base resin. The carbon or glass fibers were woven (3% by weight) together in three strands and twisted and tightened between the two abutments in a figure-of-"8" pattern. Four types of specimens were fabricated for the three-point loading test. The interface between the denture base resin and fibers was examined using scanning electron microscopy (SEM)...
2016: Dental Materials Journal
Enrico Gherlone, Paolo Capparé, Raffale Vinci, Francesco Ferrini, Giorgio Gastaldi, Roberto Crespi
PURPOSE: This study aimed to evaluate the most accurate impression technique for "All on Four" restoration, comparing conventional (CIG) and digital impressions (DIG). MATERIALS AND METHODS: Patients randomly selected for this study were required to be edentulous in at least one arch, presenting with severe posterior mandibular or maxillary atrophy. All patients underwent full-arch immediate-load rehabilitations, which were fixed to a total of four implants (two axial and two tilted)...
March 2016: International Journal of Oral & Maxillofacial Implants
Bei-bei Li, Ye Lin, Hong-yan Cui, Qiang Hao, Jia-bin Xu, Ping Di
OBJECTIVE: To assess the clinical effects of carbon fiber reinforcement on the "All-on-Four" provisional prostheses. METHODS: Provisional prostheses were divided into control group and carbon fiber reinforcing group according to whether carbon fiber reinforcement was used in the provisional prostheses base resin. In our study, a total of 60 patients (32 males and 28 females) with 71 provisional prostheses(28 maxilla and 43 mandible)were enrolled between April 2008 and December 2012 for control group; a total of 23 patients (13 males and 10 females) with 28 provisional prostheses (9 maxillas and 19 mandibles) were enrolled between January 2013 and March 2014 for carbon fiber reinforcing group...
February 18, 2016: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
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