1,721,051 research outputs found
Minimally invasive fixed rehabilitation of a totally edentulous severely atrophic mandible with 4-mm ultrashort immediately loaded implants: A case report
No full textThis case report describes the minimally invasive full fixed rehabilitation of a totally edentulous severely atrophic mandible. The patient refused to undergo any other treatment, from the reconstructive surgery to the removable prosthesis, and asked for a fixed minimally invasive solution in the shortest possible time. Considering that the posterior mandibular bone was inadequate in height and that the interforaminal bone was only 4.3 to 5 mm in height, the patient received four 4-mm-ultrashort implants in the interforaminal area that were immediately loaded. Within all the limitations of this case report this procedure in this specific case appears successful through 2 years of loading
IMMEDIATE LOADING OF 3 MM-DIAMETER IMPLANTS AS AN ALTERNATIVE TO HORIZONTAL BONE AUGMENTATION FOR PLACING NORMAL DIAMETER IMPLANTS: FOUR-MONTH POST-LOADING RESULTS FROM A MULTICENTRE RANDOMISED CONTROLLED TRIAL
No full textPURPOSE. To evaluate the effectiveness of immediately loaded 3 mm-diameter implants in alternative to horizontal bone augmentation procedures to allow placement of implants with a conventional diameter of 4 mm. MATERIALS AND METHODS. Forty-five partially edentulous patients with a bone width of between 4 and 5 mm 3 mm below the crest in areas requiring one to three adjacent implants were randomised, according to a parallel-group design, to receive one to three 3.0 mm-wide implants to be loaded immediately (23 patients) or horizontal crest augmentation with a granular bone substitute covered with a bone lamina for placing, after 6 months of healing, one to three implants at least 4 mm wide (22 patients) at two centres. Implants at augmented sites were left to heal unloaded for 4 months. Four mm-diameter implants were restored using provisional screw-retained reinforced acrylic prostheses, replaced after 4 months by definitive prostheses. Three mm-diameter implants were loaded immediately (if the insertion torque was ≥ 35 Ncm) or after 4 months with definitive metal-composite prostheses. Patients were followed-up to 4-month post-loading. Outcome measures were: prosthesis and implant failures, any complication, peri-implant marginal bone level changes, and patient satisfaction. RESULTS. No patient dropped out. In three patients, five 3 mm-diameter implants could not be inserted with a torque of 35 Ncm, so were submerged unloaded for 4 months. Two implants failed in two patients from the augmented group (P [Fisher’s exact probability test] = 0.2333; difference in proportion =-0.09; CI 95%-0.24 to 0.07) and neither patient was fitted with a definitive prosthesis. Three patients with small diameter implants were affected by three complications versus nine augmented patients with 10 complications, the difference being statistically significant (P [chi-square test] = 0.0346; difference in proportion =-0.28; CI 95%-0.50 to-0.01). Patients with 3 mm-diameter implants lost on average 0.09 mm of peri-implant bone at 4 months, while augmented patients lost 0.26 mm, a statistically significant difference (mean difference = 0.17 mm, 95% CI 0.02 to 0.31, P = 0.0235). All patients were fully satisfied with both function and aesthetics, with two exceptions: one patient from the 3-mm group was only partially satisfied with both aesthetics and function, and one patient from the augmentation group was only partially satisfied with the aesthetics. However, all patients would undergo the same procedure again. CONCLUSIONS. Four months after loading, patients treated using 3 mm-wide implants displayed better results than those horizontally augmented to receive 4 mm-wide im-plants. Three mm-wide implants might therefore be a preferable choice with respect to bone horizontal bone augmentation, the treatment being less invasive, faster, cheaper, and associated with less morbidity; however, 5-to 10-year post-loading data will be necessary before reliable recommendations can be made. CONFLICT OF INTEREST STATEMENT. Global D (Brignais, France) partially supported this trial and donated the implants and prosthetic components. OsteoBiol (Tecnoss, Giaveno, Italy) donated the biomaterials used for bone augmentation. However, the data property belonged to the authors and neither Global D nor OsteoBiol interfered in any way with the conduct of the trial or the publication of the results
FOUR-MM-LONG VERSUS LONGER IMPLANTS IN AUGMENTED BONE IN ATROPHIC POSTERIOR JAWS: THREE-YEAR POST-LOADING RESULTS FROM A MULTICENTRE RANDOMISED CONTROLLED TRIAL
No full textPURPOSE. To evaluate whether 4-mm-long dental implants could be an alternative to bone augmentation with xenografts and placement of implants of length at least 10 in posterior atrophic jaws. MATERIALS AND METHODS. Forty patients with atrophic posterior (premolar and molar areas) mandibles having 5 to 6 mm bone height above the mandibular canal and 40 patients with atrophic maxillae having 4 to 5 mm bone height below the maxillary sinus were randomised according to a parallel-group design to receive one to three 4.0-mm-long implants or one to three implants of length at least 10 mm in augmented bone at two centres. All implants had a diameter of 4.0 or 4.5 mm. Mandibles were vertically augmented with interpositional equine bone blocks and resorbable barriers. Implants were placed 4 months after grafting. Maxillary sinuses were augmented with particulated porcine bone via a lateral window covered with resorbable barriers, and implants were placed simulta-neously. Implants were not submerged. Four months later, screw-retained reinforced acrylic restorations were fitted, and replaced after 4 months by definitive screw-retained metal-composite prostheses. Patients were followed up to 3 years post-loading. Outcome measures were: prosthesis and implant failures, any complications, and peri-implant marginal bone level changes. RESULTS. Nine patients dropped out, six from the augmentation group and three from the short implant group. In six augmented mandibles (30%) it was not possible to place implants of length at least 10.0 mm, so shorter implants had to be placed instead. In man-dibles, two implants from the augmentation group failed in two patients, versus two 4.0-mm-long implants in two patients from the short implant group. In maxillae, four short implants failed in three patients versus seven long implants in four patients (two long implants and one short implant dropped into the maxillary sinus). Three prostheses on short implants (one mandibular and two maxillary) failed or were placed at a later stage due to implant failure, versus eight prostheses (three mandibular and five maxil-lary) at augmented sites. There were no statistically significant differences in implant failures (P [Fisher’s exact test] = 0.159; difference in proportion = 0.05; CI 95%-0.11 to 0.21) or prostheses failures (P [Fisher’s exact test] = 0.919; difference in proportion = 0.02; CI 95%-0.14 to 0.18). There were more patients affected by complications in the augmentation group (18 patients affected by 30 complications versus 8 patients affected by 10 complications), but the difference was not statistically significant (P [Fisher’s exact test] = 0.587; difference in proportion =-0.72; CI 95%-0.29 to 0.14). At 3 years post-loading, average peri-implant bone loss was 0.62 mm at 4-mm-long mandibular implants, 0.71 mm at 10-mm or longer mandibular implants, 1.14 mm at short maxillary implants and 0.73 mm at long maxillary implants. The difference was not statistically significant in mandibles (mean difference-0.08 mm, 95% CI-0.37 to 0.20, P [ANCOVA] = 0.568), but was significant in maxillae, with greater bone loss at short implants (mean difference 0.41 mm, 95% CI-0.04 to 0.87, P [ANCOVA] = 0.037). CONCLUSIONS. Three years after loading, 4.0-mm-long implants yielded similar, if not bet-ter, results than longer implants in augmented jaws, but were affected by fewer compli-cations. Hence, short implants may be preferable to bone augmentation, especially in mandibles, since the treatment is less invasive, faster, cheaper, and associated with less morbidity. However, 5-to 10-year post-loading data will be necessary to make reliable recommendations
IMMEDIATE, EARLY (6 WEEKS) AND DELAYED (4 MONTHS) SINGLE POST-EXTRACTIVE IMPLANTS: 3-YEAR POST-LOADING DATA FROM A RANDOMISED CONTROLLED TRIAL
No full textPURPOSE. To compare the clinical outcome of single implants placed immediately after tooth extraction with those placed 6 weeks after tooth extraction (early placement), and those placed 4 months after extraction and socket healing (delayed placement). MATERIALS AND METHODS. Two hundred and ten patients requiring one single im-plant-supported crown to replace a tooth to be extracted were randomised into 3 groups of 70 patients each to receive immediate, early (at 6 weeks), or delayed (after 4 months of healing) post-extraction implants, according to a parallel-group design. When needed, patients from the immediate and early groups had bone substitute grafts in the extraction socket, covered with a resorbable membrane, at implant placement. Sockets randomised to delayed implants were grafted in the same manner if poorly preserved, or in the “aesthetic” areas (from second upper premolar to second upper premolar). Implants inserted with at least 25 Ncm torque were left to heal unloaded for 4 months, whereas those inserted with less than 25 Ncm were left to heal unloaded for 6 months. Temporary crowns were delivered, and were to be replaced by definitive ones after 4 months. Outcome measures were crown and implant failures; complications; peri-im-plant marginal bone level changes; aesthetics, as assessed using the pink aesthetic score (PES); and patient satisfaction, recorded by blinded assessors. Patients were fol-lowed-up for 3 years post-loading. RESULTS. Three years after loading, drop-outs were: five (7.1%) patients from the imme-diate, nine (12.9%) from the early, and eight (11.4%) from the delayed group. Five implants (9.2%) failed in the immediate, four (6.6%) in the early, and one (1.6%) in the delayed group (P [Freeman-Halton] = 0.282). Apart from the crowns that failed due to implant losses, no other definitive crown had to be remade. Complications affected eleven patients from the immediate group, 12 from the early, and eight from the delayed group (P [chi-square test] = 0.596). Mean peri-implant marginal bone loss after 3 years was-0.33 ± 0.22 mm at immediate,-0.43 ± 0.26 mm at early, and-0.49 ± 0.30 at delayed implants; (P [Kruskal Wallis test] <0.001); there were significant pairwise differences between immediate and early (0.10 mm; CI 95%-0.02; 0.22; P [Dunn-Bonferroni post-hoc] = 0.0391) and immediate and delayed implants (0.16 mm; CI 95% 0.04; 0.27; P [Dunn-Bonferroni post-hoc] = 0.0004), but no difference between early and delayed implants (0.06 ± 0.05 mm; CI 95%-0.06; 0.18; P [Dunn-Bonferroni post-hoc] = 0.6015). Three years after loading, the mean overall PES were 12.25, 11.98 and 11.17 in the immediate, early and delayed groups, respectively (P [Kru-skal Wallis test] <0.001); there were significant pairwise differences between immediate and delayed (1.08 ± 0.27 mm; CI 95% 0.45; 1.72; P [Dunn-Bonferroni post-hoc] = 0.0006), and early and delayed implants (0.81 ± 0.27 mm; CI 95% 0.17; 1.46; P [Dunn-Bonferroni post-hoc] = 0.0099), but no difference between immediate and early implants (0.27 ± 0.27 mm; CI 95%-0.37; 0.90; P [Dunn-Bonferroni post-hoc] = 1.0000). There were no significant diffe-rences in patient satisfaction regarding function (P = 0.353) or aesthetics (P=0.531), and all patients would undergo the same procedure again. CONCLUSIONS. No statistically significant differences in failure, complications or patient satisfaction were observed when placing single implants immediately, 6 weeks or four months after tooth extraction, even though failures were more frequent in immediate and early implants. Bone loss was significantly smaller at immediate implants, and aesthetic evaluation scores were higher for immediate and early implants
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
Guided Bone Regeneration with Nonresorbable Membranes in the Rehabilitation of Partially Edentulous Atrophic Arches: A Retrospective Study on 122 Implants with a 3- to 7-Year Follow-up
No full textThe aim of this retrospective study was to evaluate clinical and radiographic outcomes of guided bone regeneration (GBR) procedures in the rehabilitation of partially edentulous atrophic arches. A total of 58 patients were included with a follow-up of 3 to 7 years after loading. Data seem to indicate that GBR with nonresorbable membranes can be a good clinical choice and suggest that it could be used to vertically reconstruct no more than 6 mm of bone in the posterior mandible. However, this technique remains difficult and requires expert surgeons
Super-short (4-mm) postextractive, immediately provisionalized implant in a minimally invasive rehabilitation approach avoiding extraction of the impacted maxillary canine: A 2-year follow-up case report
No full textThis case report describes an alternative minimally invasive fixed rehabilitation to approach an impacted maxillary canine (IMC) and the residual deciduous teeth. The patient refused any orthodontic treatment or surgical extraction of the IMC, asking for a fixed and fast option. Considering the available bone was about 5 mm in height, an immediately provisionalized postextractive 4-mm super-short implant was placed. Healing was uneventful. Two years after loading, the result was stable and the patient was fully satisfied. Within all the limitations of this case report, this approach could reduce rehabilitative times, possible complications, and costs
- …
