1,720,971 research outputs found
New generation of fixture–abutment connection combining soft tissue design and vertical screw-retained restoration: 1-year clinical, aesthetics and radiographic preliminary evaluation
No full textImplant design factors and the abutment connection are correlated with crestal bone stability. The aim of the present study was to evaluate a new type of screw-retained prostheses delivered on tissue-level implants with conical external vertical seal and internal hexagon connection. Implants 4.25 mm in diameter and 10 mm in length (Prama, Sweden and Martina) were placed in partially edentulous patients needing at least one implant in the healed site, having sufficient bone volume. The implant neck was positioned above the bone crest. A healing abutment was placed according to a one-stage approach. Outcome measures were implant and prosthesis survival rate, any complications, marginal bone loss (MBL), periodontal parameters, and pink esthetic score (PES). Overall, 13 patients (4 women and 9 men; mean age 50 ± 22 years) with the same number of implants were treated and followed for one year after loading. At the 12-month follow up, no implant and no prosthesis failed, and no complications were experienced. The mean MBL experienced at the one year follow-up was 0.65 ± 0.48 mm. One year after loading, 2 out of 13 implants present bleeding on probing (15.4%), 4 out of 13 patients presented with plaque at the one year of follow-up (30.8%) and the PES was 10.5 ± 2.3 mm. Within the limitations of the present study, the analyzed implants seem to be a viable treatment option for the rehabilitation of a single tooth gap
Effectiveness of ball attachment systems in implant retained- And supported-overdentures: A three- And five-year retrospective examination
No full textPurpose: To evaluate implant and prosthetic survival rates, complications, patient satisfaction, and biological outcomes of patients rehabilitated with a ball attachment system for implant retained- and supported-overdentures (IOV), which was in function for 3 to 5 years. Methods: This retrospective study evaluated data collected from patients treated between April 2001 and May 2018 with IOV on splinted and non-splinted implants and a ball attachment system. Patients were followed for 36 to 206 months (mean follow-up was 128.1 ± 51.9 months). Data were collected at the 3- and 5-year follow-up examination. Outcome measures were implant and prosthetic survival rates, technical complications, marginal bone loss (MBL), oral health impact profile (OHIP), and periodontal parameters (bleeding on probing and plaque index). Results: A total of 46 patients (16 males and 30 females) with 124 implants were included in this study. Twenty-five implant-retained overdentures were delivered on 53 unsplinted implants, while the other 21 patients received an implant-supported overdentures and the implants were splinted. At the five-year follow-up examination, one implant and one prosthesis failed in the unsplinted group, resulting in a cumulative survival rate of 97.8% at the patient level. Two minor technical complications were experienced. Conclusions: Implant overdenture retained or supported by ball attachment systems showed high implant and prosthetic survival and success rates. A low number of complications, high patient satisfaction, and successful biological parameters were experienced in the mid-term follow-up. Data need to be confirmed by further randomized trials
Immediately loaded tilted implants combined with angulated screw channel zirconia abutments in atrophic maxillary patients: A three-year after loading prospective case series study
No full textPurpose. To evaluate the 3-year clinical and radiographic outcomes of partially edentulous patients treated with immediately loaded tilted implants, combined with angulated screw channel (ASC) zirconia abutments.
Materials and methods. Any patient requiring an implant-supported fixed dental prosthesis for the rehabilitation of the atrophic posterior maxilla and refusing guided bone reconstruction was considered eligible for this study. Two to three immediately loaded flapless implants, combined with immediately placed ASC abutments were placed for each patients. Six
months after implant placement/loading a definitive prosthesis was placed. Outcomes were: prosthesis and implant failures, complications, and peri-implant bone level changes. Outcomes were recorded at implant placement/loading and yearly
up to 3-year later.
Results. Twenty-three anodized implants and ASC zirconia abutments were placed in 10 consecutive participants (mean
age 57.2 years) with severe atrophy of the posterior maxilla, by using computer-guided template-assisted surgery. The
mean follow-up period was 38.2 months. No patients dropped out. The prosthesis and implant cumulative survival rate
was 100%. No biologic or technical complications were experienced during the entire follow-up. Mean marginal bone levels were 0.29±0.34 mm at implant placement and loading, 0.37±0.32 mm at the 1-year follow-up (difference 0.08±0.11
mm; p=0.002), 0.38±0.33 mm at the 2-year follow-up (difference between the 1- and 2-year follow-up 0.02±0.08 mm;
p=0.295), and 0.50±0.42 mm at the 3-year follow-up (difference from implant place-ment 0.22±0.22 mm; p=0.000).
Conclusions. Guided surgery and immediate loading of ASC zirconia abutment is an effective and reliable treatment option for the treatment of the partially edentulous posterior atrophic maxilla. Further RCT studies are needed to better understand the gold standard approach in such patients
Immediately loaded tilted implants combined with angulated screw channel zirconia abutments in atrophic maxillary patients: A three-year after loading prospective case series study
No full textPurpose. To evaluate the 3-year clinical and radiographic outcomes of partially edentulous patients treated with immediately loaded tilted implants, combined with angulated screw channel (ASC) zirconia abutments. Materials and methods. Any patient requiring an implant-supported fixed dental prosthesis for the rehabilitation of the atrophic posterior maxilla and refusing guided bone reconstruction was considered eligible for this study. Two to three immediately loaded flapless implants, combined with immediately placed ASC abutments were placed for each patients. Six months after implant placement/loading a definitive prosthesis was placed. Outcomes were: prosthesis and implant failures, complications, and peri-implant bone level changes. Outcomes were recorded at implant placement/loading and yearly up to 3-year later. Results. Twenty-three anodized implants and ASC zirconia abutments were placed in 10 consecutive participants (mean age 57.2 years) with severe atrophy of the posterior maxilla, by using computer-guided template-assisted surgery. The mean follow-up period was 38.2 months. No patients dropped out. The prosthesis and implant cumulative survival rate was 100%. No biologic or technical complications were experienced during the entire follow-up. Mean marginal bone levels were 0.29±0.34 mm at implant placement and loading, 0.37±0.32 mm at the 1-year follow-up (difference 0.08±0.11 mm; p=0.002), 0.38±0.33 mm at the 2-year follow-up (difference between the 1-and 2-year follow-up 0.02±0.08 mm; p=0.295), and 0.50±0.42 mm at the 3-year follow-up (difference from implant place-ment 0.22±0.22 mm; p=0.000). Conclusions. Guided surgery and immediate loading of ASC zirconia abutment is an effective and reliable treatment option for the treatment of the partially edentulous posterior atrophic maxilla. Further RCT studies are needed to better understand the gold standard approach in such patients
CRESTAL VERSUS LATERAL SINUS LIFT: ONE-YEAR RESULTS FROM A WITHIN-PATIENT RANDOMISED CONTROLLED TRIAL
No full textPURPOSE. To compare the effectiveness of and patient preference for crestal versus lateral sinus lift. MATERIALS AND METHODS. Fifteen partially edentulous patients missing bilateral maxillary molars and/or premolars and having 2 to 6 mm of residual crestal height below the maxillary sinuses were randomised to receive one to three implants placed in sinuses crestally or laterally lifted with bone substitutes according to a split-mouth design. Implants were submerged and loaded after 6 months with definitive screw-retained me-tal-ceramic prostheses, and patients were followed-up to 1 year after loading. RESULTS. Twenty crestal implants were placed versus 23 lateral ones. One patient dropped out and one lateral implant failed (n = 14; difference = 0.07, 95% CI from-0.28 to 0.13; P = 0.99). No prosthesis failed. Three patients were affected by three complications at crestal versus three patients by four complications at lateral sites. The difference was not statistically significant (n = 14; Diff = 0.07; 95% CI-0.24 to 0.38; P-value = 0.99). Statistically significantly less time was required to place crestal implants (28.2 versus 62.2 minu-tes on average; Diff = 33.4; SD = 12.1; 95% CI-40.4 to 26.4; P = 0.001). Eight patients preferred the crestal procedure and six had no preference. Crestal implants lost 0.99 mm (SD = 0.55) of peri-implant bone height versus 1.02 mm (SD = 0.57) for lateral ones, the difference being not statistically significant (0.03 mm; 95% CI of difference-0.52 to 0.59; P = 0.89) CONCLUSIONS. Both techniques produced successful outcomes, but the crestal technique required less surgical time and was preferred by patients
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
The Use of Vacuum Plasma Surface Treatment to Improve the Hydrophilicity and Wettability of Bone Graft Substitutes and Resorbable Membranes: An In Vitro Study
No full textBackground/Objectives: We wished to evaluate in vitro whether vacuum plasma surface treatment of bone graft substitutes and resorbable membranes could improve the hydrophilicity and wettability of the tested materials. Methods: A total of 28 sterilized samples were considered for this research and divided into three groups. Six samples were used for the SEM-EDS analysis. The other 22 samples were randomly assigned into the test (plasma-treated, n = 11) and control (no treatment, n = 11) groups. Vacuum plasma surface treatment was performed in the test group before the SEM-EDS analysis using the ACTILINK reborn with a material holder (Plasmapp Co., Ltd., Daejeon, Republic of Korea). Plasmatreat (Plasmatreat, Steinhagen, Germany) inks were used to evaluate the differences in the hydrophilicity between the test and control groups. The outcome measures were the absorption time, wettability grade, and grade of decontamination after different time cycles. Results: After the vacuum plasma surface treatment, the absorption time of the inks statistically decreased in all of the subgroups (p < 0.05), while the wettability grade increased. The SEM-EDS analyses showed an increased reduction rate of carbon impurities after up to three vacuum plasma surface treatment cycles. Furthermore, the SEM-EDS analysis did not reveal any areas of damage caused by the multiple treatments. Conclusions: Within the limitations of this in vitro study, the vacuum plasma surface treatment increased the hydrophilicity and wettability of the tested biomaterials. Particle bone graft and bone blocks should be treated using longer time programs. Further well-conducted randomized clinical trials with sample size calculations are needed to confirm these preliminary results
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