1,720,961 research outputs found
Ridge augmentation with mineralized block allografts: Clinical and histological evaluation of 8 cases treated with the 3-dimensional block technique
No full text10.1097/ID.0b013e31826f7a67Implant Dentistry216444-44
Posterior atrophic mandible rehabilitation with onlay allograft created with CAD-CAM procedure: a case report.
No full textAIM: Implant rehabilitation of the atrophic right posterior mandible in a 48-year-old woman using dehydrated homologous bone block, shaped with a computer aided design-computer aided manufacturing (CAD-CAM) system, to avoid harvesting of autologous bone block and to assure a perfect fitting of the block above the alveolar crest.
RESULTS: After 7 months, 6.09, 7.36, and 8.08 mm (mean, 7.18 mm) of total horizontal bone gain was observed at sites 6, 12, and 18 mm posterior to the right mental foramen, respectively.
CONCLUSIONS: The use of a bone block with CAD-CAM system for alveolar ridge augmentation is a valuable alternative to autograft because it reduces time, cost, and complications for the patients. Data from a computerized tomographic scan can be used to shape a precise 3-dimensional homologous bone block using a CAD-CAM system
Immediate loading of post-extractive versus delayed placed single implants in the anterior maxilla: Outcome of a pragmatic multicenter randomised controlled trial 1-year after loading
No full textPurpose: To compare the effectiveness of immediate post-extractive single implants with delayed implants, placed in preserved sockets after 4 months of healing. Implants that achieved an insertion torque of at least 35 Ncm were immediately non-occlusally loaded. Materials and methods: Just after tooth extraction, and in the presence of less than 4 mm of vertical loss of the buccal bone in relation to the palatal wall, 106 patients requiring a single immediate post-extractive implant in the maxilla from second to second premolar were randomly allocated to immediate implant placement (immediate group; 54 patients) or to socket preservation using anorganic bovine bone covered by a resorbable collagen barrier (delayed group; 52 patients), according to a parallel group design at three different centres. Bone-to-implant gaps were to be filled with anorganic bovine bone, however this was not carried out in 17 patients (corresponding to 40% of those who should have been grafted). Four months after socket preservation, delayed implants were placed. Implants inserted with an insertion torque of at least 35 Ncm were immediately loaded with non-occluding provisional single crowns, then replaced after 4 months by definitive crowns. Patients were followed up to 1 year after loading. Outcome measures were implant failures, complications, aesthetics assessed using the pink esthetic score (PES), peri-implant marginal bone level changes and patient satisfaction recorded by blinded assessors. Results: Nineteen (35%) implants were not immediately loaded in the immediate group versus 39 (75%) implants in the delayed placement group because an insertion torque superior to 35 Ncm could not be obtained. Six patients dropped out 4 months after loading from the delayed group versus none in the immediate group. Two implants failed in the immediate group (6%) versus none in the delayed group, with the difference showing no statistical significance (difference in proportions = 0.04; 95% CI: -0.03 to 0.11; P = 0.187). Eight minor complications occurred in the immediate group and one in the delayed group, and this was statistically significant (difference in proportions = 0.13; 95% CI: 0.03 to 0.23; P = 0.028). At delivery of definitive crowns, 4 months after loading, the mean aesthetic score was 12.8 and 12.6 in the immediate and delayed groups, respectively. At 1 year after loading, the mean aesthetic score was 13.0 and 12.8 in the immediate and delayed groups, respectively. There was no statistically significant difference at 4 months (P = 0.500) and at 1 year (P = 0.615). Marginal bone levels at implant insertion (after bone grafting) were 0.10 mm for immediate implants and 0.02 mm for delayed implants, which did not have a statistically significantly difference (mean difference = 0.08; 95% CI: 0.04 to 0.12; P < 0.001). One year after loading, patients of the immediate group lost on average 0.23 mm and those in the delayed
Immediate non-occlusal loading of immediate post-extractive versus delayed placement of single implants in preserved sockets of the anterior maxilla: 4-month post-loading results from a pragmatic multicentre randomised controlled trial.
No full textPURPOSE: To compare the effectiveness of immediate post-extractive single implants with delayed implants placed in preserved sockets after 4 months of healing. Implants that achieved an insertion torque of at least 35 Ncm were immediately non-occlusally loaded.
MATERIALS AND METHODS:
Just after tooth extraction and in the presence of a loss of the buccal plate bone less than 4 mm, compared to the palatal wall, 106 patients requiring a single immediate postextractive implant in the maxilla from second premolar to second premolar were randomly allocated to immediate implant placement (immediate group; 54 patients) or to socket preservation using anorganic bovine bone covered by a resorbable collagen barrier (delayed group; 52 patients) according to a parallel group design at three different centres. Bone-to-implant gaps were to be filled with anorganic bovine bone, however this was not done in 17 patients (corresponding to 40% of those who should have been grafted). Four months after socket preservation, delayed implants were placed. Implants placed with an insertion torque >35 Ncm were immediately loaded with non-occluding provisional single crowns, replaced, after 4 months, by definitive crowns. Outcome measures were implant failures, complications, aesthetics assessed using the pink esthetic score (PES), and patient satisfaction, recorded by blinded assessors. All patients were followed up to 4 months after loading.
RESULTS:
Nineteen (35%) implants were not immediately loaded in the immediate group versus 39 (75%) implants in the delayed placement group because an insertion torque >35 Ncm could not be obtained. No patient dropped out. Two implants failed in the immediate group (4%) versus none in the delayed group. More minor complications occurred in the immediate group (8) than the in the delayed group (1) and this was statistically significant (P = 0.032). At delivery of definitive crowns, 4 months after loading, aesthetics were scored as 12.8 and 12.6 in the immediate and delayed groups, respectively. There was no statistically significant difference (P = 0.5). Patients of both groups were equally satisfied.
CONCLUSIONS:
There were more complications at immediate post-extractive implants when compared to delayed implants. The aesthetic outcome appears to be similar for both groups and it seems more difficult to obtain a high insertion torque in sockets preserved with anorganic bovine bone
Impianti singoli post-estrattivi immediati verso dilazionati a carico immediato in mascellari superiori anteriori: risultati di uno studio clinico controllato randomizzato pragmatico multicentrico ad un anno dal carico.
No full textOBIETTIVO: Confrontare l’efficacia di impianti singoli post-estrattivi immediati con impianti dilazionati a 4 mesi posizionati in alveoli preservati. Gli impianti con un torque di inserimento di almeno 35 Ncm sono stati sottoposti a carico immediato non occlusale.
MATERIALI E METODI: Immediatamente dopo l’estrazione dentale, e in presenza di meno di 4 mm di perdita di osso verticale buccale in relazione alla parete palatale, 106 pazienti che necessitavano di un impianto singolo post-estrattivo immediato nel mascellare superiore dal secondo al secondo premolare, sono stati randomizzati al gruppo degli impianti immediati (gruppo impianti immediati; 54 pazienti) o al gruppo sottoposto alla preservazione dell’alveolo mediante osso bovino anorganico coperto da barriera di collagene riassorbibile (gruppo impianti dilazionati; 52 pazienti), secondo uno studio a gruppi paralleli presso tre centri. Il protocollo prevedeva di riempire lo spazio osso-impianto con osso di bovino anorganico, tuttavia questo non è stato fatto per 17 dei pazienti (ovvero il 40% di coloro che avrebbero dovuto ricevere l’innesto). 4 mesi dopo la procedura di preservazione dell’alveolo, sono stati posizionati gli impianti dilazionati. Gli impianti con un torque di inserimento di almeno 35 Ncm sono stati caricati immediatamente con corone provvisorie singole non in occlusione, sostituite dopo 4 mesi con corone definitive. I pazienti sono stati seguiti per 1 anno dopo il carico. I parametri di valutazione presi in considerazione sono stati: fallimenti implantari, complicazioni, valutazione estetica realizzata mediante PES (pink esthetic score, punteggio di valutazione dell’estetica della gengiva), livelli ossei marginali peri-implantari e soddisfazione del paziente, registrati da valutatori in cieco.
RISULTATI: 19 impianti (35%) non sono stati caricati immediatamente nel gruppo degli impianti immediati verso 39 (75%) nel gruppo a posizionamento dilazionato perché non era stato possibile raggiungere un torque superiore a 35 Ncm. Sei pazienti hanno lasciato lo studio dopo 4 mesi dal carico nel gruppo degli impianti dilazionati verso nessuno nel gruppo degli impianti immediati. Ci sono stati 2 fallimenti implantari nel gruppo degli impianti immediati (3,7%) verso nessuno nel gruppo dilazionato, ma la differenza non è statisticamente significativa (differenza delle proporzioni = 0,04; 95% IC da -0,03 a 0,11; P = 0,187). Si sono verificate 8 complicazioni minori nel gruppo degli impianti immediati e una nel gruppo degli impianti dilazionati e la differenza è statisticamente significativa (differenza delle proporzioni = 0,13; IC 95% da -0,03 a 0,23; P= 0,028). Alla consegna delle corone definitive, 4 mesi dopo il carico, la media del punteggio relativo all’estetica era di 12,8 e 12,6, rispettivamente nel gruppo degli impianti immediati e dilazionati. A 1 anno dal carico, la media del punteggio relativo all’estetica era di 13,0 e 12,8, rispettivamente per il gruppo degli impianti immediati e dilazionati. Le differenze a 4 mesi e a 1 anno non erano statisticamente significative, rispettivamente P = 0,500 e P = 0,615. I livelli ossei marginali all’inserimento degli impianti (dopo l’innesto osseo) erano di 0,10 mm per gli impianti immediati e 0,02 mm per gli impianti dilazionati, ma ciò non comporta una differenza staticamente significativa (differenza media = 0,08; IC 95%: da 0,04 a 0,12; P < 0,001). Un anno dopo il carico, i pazienti del gruppo degli impianti immediati hanno perso in media 0,23 mm verso 0,29 mm per quelli del gruppo degli impianti dilazionati, per una differenza statisticamente significativa (differenza media = -0,06; IC 95%: da -0,11 a -0,01; P = 0,036). I pazienti di entrambi i gruppi si sono dimostrati soddisfatti allo stesso modo,sia a 4 mesi che a 1anno dal carico.
CONCLUSIONI: Si riscontra un maggior numero di complicazioni per gli impianti post-estrattivi immediati rispetto a quelli dilazionati. Sembra che sia più difficile ottenere un torque di inserimento superiore a 35 Ncm negli alveoli preservati con osso bovino anorganico dopo 4 mesi di guarigione rispetto ai siti post-estrattivi. Il risultato estetico è simile per entrambi i gruppi
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
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