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All-on-four

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https://www.readbyqxmd.com/read/27767256/digital-evaluation-of-three-splinting-materials-used-to-fabricate-verification-jigs-for-full-arch-implant-prostheses-a-comparative-study
#1
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...
October 21, 2016: Journal of Esthetic and Restorative Dentistry
https://www.readbyqxmd.com/read/27615425/biomechanical-analysis-of-immediately-loaded-implants-according-to-the-all-on-four-concept
#2
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...
September 5, 2016: Journal of Prosthodontic Research
https://www.readbyqxmd.com/read/27612765/comparison-between-all-on-four-and-all-on-six-treatment-concepts-and-framework-material-on-stress-distribution-in-atrophic-maxilla-a-prototyping-guided-3d-fea-study
#3
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
https://www.readbyqxmd.com/read/27339242/the-all-on-four-concept-may-be-a-viable-treatment-option-for-edentulous-rehabilitation
#4
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...
June 2016: Evidence-based Dentistry
https://www.readbyqxmd.com/read/27183073/marginal-bone-stability-around-tapered-platform-shifted-implants-placed-with-an-immediately-loaded-four-implant-supported-fixed-prosthetic-concept-a-cohort-study
#5
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
https://www.readbyqxmd.com/read/27148987/comparison-of-different-impression-techniques-when-using-the-all-on-four-implant-treatment-protocol
#6
COMPARATIVE STUDY
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
https://www.readbyqxmd.com/read/27148979/straight-versus-angulated-abutments-on-tilted-implants-in-immediate-fixed-rehabilitation-of-the-edentulous-mandible-a-3-year-retrospective-comparative-study
#7
COMPARATIVE STUDY
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
https://www.readbyqxmd.com/read/27041017/in-vitro-evaluation-of-the-flexural-properties-of-all-on-four-provisional-fixed-denture-base-resin-partially-reinforced-with-fibers
#8
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
https://www.readbyqxmd.com/read/27004280/conventional-versus-digital-impressions-for-all-on-four-restorations
#9
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
https://www.readbyqxmd.com/read/26885923/-clinical-evaluation-of-all-on-four-provisional-prostheses-reinforced-with-carbon-fibers
#10
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
https://www.readbyqxmd.com/read/26848820/cantilever-lengths-and-anterior-posterior-spreads-of-interim-acrylic-resin-full-arch-screw-retained-prostheses-and-their-relationship-to-prosthetic-complications
#11
Carl Drago
PURPOSE: To retrospectively record the distal cantilever lengths (CL) of full-arch interim, all-acrylic resin prostheses used in an immediate occlusal loading protocol. Anterior/posterior (A/P) spreads were measured on master casts associated with the interim prostheses. Ratios were calculated (CL/AP). Prosthetic complications were recorded. The ratios and prosthetic complications were statistically compared and analyzed for statistical and clinical significance. MATERIALS AND METHODS: One hundred twenty-eight patients with 192 edentulous arches (109 maxillary; 83 mandibular; 190 arches were restored with 4 implants; 2 maxillary arches were restored with 5 implants) were treated...
February 5, 2016: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/26809594/maxillary-all-on-four-treatment-using-zygomatic-implants-a-mechanical-analysis
#12
P H de Moraes, S Olate, M de Arruda Nóbilo, L Asprino, M de Moraes, J de Albergaría Barbosa
OBJECTIVE: Zygomatic implants may be used for dental rehabilitation in atrophic maxillae. The aim of this study was to establish experimentally the areas of stress distribution using 2 kinds of "All-On-Four" maxillary procedures. STUDY DESIGN: The best position to insert the implants was selected using polyurethane craniomaxillary models and surgical guides were made. Group 1 was designed with two posterior zygomatic implants and two conventional anterior implants, and group 2 with two posterior zygomatic implants and two anterior zygomatic implants...
April 2016: Revue de Stomatologie, de Chirurgie Maxillo-faciale et de Chirurgie Orale
https://www.readbyqxmd.com/read/26619306/a-retrospective-2-year-clinical-study-of-immediate-prosthetic-rehabilitation-of-edentulous-jaws-with-four-implants-and-prefabricated-bars
#13
Gianpaolo Sannino, Patrizio Bollero, Alberto Barlattani, Enrico Gherlone
PURPOSE: The purpose of this retrospective investigation was to evaluate the use of a prefabricated bar system for immediately loaded implants placed and restored according to the All-on-Four concept with up to 24-month follow-up. MATERIALS AND METHODS: A total of 51 patients (31 males and 20 females; mean age 63.4 years) presented with edentulous or partially edentulous jaws with severe atrophy of the posterior regions. All patients were treated with full-arch fixed prostheses (28 maxillary, 34 mandibular) each supported by four implants (two vertical, two distally tilted)...
November 30, 2015: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/26393141/role-of-cytochrome-modulators-in-altering-the-occurrence-of-cataract-in-rats
#14
Kanchan Gupta, Shivani Juneja, G S Bajwa, Sandeep Kaushal
BACKGROUND: Cataract is one of the primary causes of blindness all over the world. It indicates the onset of secondary complications of diabetes. The only treatment available is surgery as there are no satisfactory drugs which can prevent or retard the initiation and maturation of cataract. It was hypothesized that cytochrome P 450 (CYP) inducers or inhibitors can modify the cataract occurrence by accelerating or delaying the occurrence of cataract respectively. OBJECTIVE: To study the effect of two commonly used drugs, phenytoin (CYP inducer) and ciprofloxacin (CYP inhibitor) on the initiation and maturation of cataract with the galactose- induced cataract model...
July 2015: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/26392913/a-study-on-the-single-dose-oral-toxicity-of-super-key-in-sprague-dawley-rats
#15
Jinhee Kim, Jongcheol Lee, Sungchul Kim
OBJECTIVES: This study was performed to analyze the single-dose oral toxicity of the super key (processed sulfur). METHODS: All experiments were conducted at Medvill, an institution authorized to perform non-clinical studies, under the Good Laboratory Practice (GLP) regulations. In order to investigate the oral toxicity of super key We administered it orally to Sprague-Dawley (SD) rats. The SD rats were divided into four groups of five male and five female animals per group: group 1 being the control group and groups 2, 3, and 4 being the experimental groups...
September 2015: Journal of Pharmacopuncture
https://www.readbyqxmd.com/read/26392903/clinical-abnormalities-in-working-donkeys-and-their-associations-with-behaviour
#16
F H Regan Nee Ashley, J Hockenhull, J C Pritchard, A E Waterman-Pearson, H R Whay
INTRODUCTIONS: Working donkeys are at risk of developing multiple, acute and chronic health problems. The ability to recognise and assess pain in donkeys associated with these health problems is important for people responsible for their care and treatment, including owners and veterinary or animal health workers. AIMS AND OBJECTIVES: The aims of this study were firstly to quantify the prevalence of a range of clinical abnormalities within a sample of working donkeys; and secondly to find out whether these abnormalities were associated with potential behavioural indicators of pain...
2015: Veterinary Record Open
https://www.readbyqxmd.com/read/26392890/determination-of-the-minimum-infusion-rate-of-alfaxalone-during-its-co-administration-with-midazolam-in-goats
#17
T B Dzikiti, P S Ndawana, G Zeiler, L Bester, L N Dzikiti
INTRODUCTION: The minimum infusion rate (MIR) of alfaxalone when co-administered with midazolam in goats was evaluated. MATERIALS AND METHODS: Eight goats (four does and four wethers) were anaesthetised, on separate occasions, with alfaxalone at an initial dose of 9.6 mg/kg/hour combined with one of three midazolam treatments: a bolus of 0.1 mg/kg followed by constant rate infusion (CRI) of 0.1 mg/kg/hour (treatment LMID), 0.3 mg/kg followed by CRI of 0...
2015: Veterinary Record Open
https://www.readbyqxmd.com/read/26392685/evaluation-of-serum-interleukin-10-levels-as-a-predictor-of-glycemic-alteration-in-chronic-periodontitis-and-type-2-diabetes-mellitus
#18
Anirudh Balakrishna Acharya, Srinath Thakur, Mahadevayya Veerayya Muddapur
AIM: Chronic periodontal disease (CPD) and type 2 diabetes mellitus (T2DM) share common pathogenic pathways. This study aimed to estimate levels of serum interleukin (IL-10), an anti-inflammatory cytokine also associated with T2DM and evaluate its association with hyperglycemia. MATERIALS AND METHODS: This investigation involved sixty participants divided into four groups comprising 15 participants each: Group 1 (healthy controls), Group 2 (CPD patients), Group 3 (T2DM patients with CPD) and Group 4 (T2DM patients)...
July 2015: Journal of Indian Society of Periodontology
https://www.readbyqxmd.com/read/26390722/-clinical-and-epidemiological-characteristics-of-acute-myeloid-leukemias-in-adults-according-to-the-data-of-municipal-hematology-departments-in-moscow
#19
MULTICENTER STUDY
S V Semochkin, T N Tolstykh, N V Arkhipova, V L Ivanova, O V Kliueva, V V Lunin, E N Misiurina, M V Tumanova, N K Khuazheva
AIM: To estimate the incidence of acute myeloid leukemias (AML) in Moscow adults and to evaluate the efficiency of their treatment. SUBJECTS AND METHODS: Data on Moscow residents who were first diagnosed with AML in 2010 were retrospectively collected. The efficiency of their treatment was evaluated from the rates of complete remissions (CR), recurrences, deaths, and 4-year overall (OS) and relapse-free survival (RFS). The data as of September 1, 2013, were analyzed...
2015: Terapevticheskiĭ Arkhiv
https://www.readbyqxmd.com/read/26390663/-study-on-effect-of-scutellarin-in-resisting-liver-fibrosis-in-rats
#20
Yin-hui Wang, Ling Geng, Hui Li
Totally 80 rats were randomly divided into the control group, the model group, low, middle and high dose (25, 50, 100 mg x kg(-1)) scutellarin( SC) groups and the colchicine ( Col) group. Apart from the blank group, all of the remaining groups were intraperitoneally injected with 0.5 mL pig serum twice every week for consecutively 13 weeks and orally administered with the corresponding drugs since the 9th week. The blank group and the model group were orally given equal volume of normal saline once every for consecutively four weeks...
May 2015: Zhongguo Zhong Yao za Zhi, Zhongguo Zhongyao Zazhi, China Journal of Chinese Materia Medica
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