1,721,081 research outputs found
Rimodellamento osseo perimplantare:background scientifico e implicazioni cliniche
No full textIl nuovo libro dei Dottori Canullo, Cocchetto e Loi è un manuale scritto assieme a più di dieci collaboratori.
Il contenuto esamina gli aspetti fondamentali dell'implantologia odontoiatrica per poi passare ai più moderni concetti del platform switching, del carico immediato e della piezochirurgia .
Il primo capitolo, corredato da ben 186 referenze bibliografiche, analizza i vari aspetti riguardanti il modellamento ed il rimodellamento dell'osso e i rischi ad esso collegati.
I fattori locali e sistemici inerenti al paziente sono identificati e valutati.
Sono altresi descritte le tre condizioni che maggiormente influiscono sul rimodellamento dell'osso peri-implantare, vale a dire i fattori chirurgici, sistemici e locali .
Il secondo capitolo verte maggiormente sugli aspetti clinici: il disegno del lembo e la stabilità del tessuto peri-implantari sono discussi alla luce dei concetti di biotipo e di ampiezza biologica.
Il terzo capitolo introduce il nuovo concetto della preaparazione minimamente invasiva del sito dell'impianto applicando le tecniche piezochirurgiche.
I due capitoli successivi sono dedicati al concetto di platform switching, che viene trattato sia da un punto di vista teorico che da un punto di vista pratico.
Grande enfasi è posta sulle conseguenze istologiche di questo concetto.
Molta attenzione è stata data agli stuid sull'analisi degli elementi finiti (FEA). Questi dovrebbero descrivere gli effetti del platform switching sui livelli marginali ossei attorno agli impianti. Bisogna comunque ricordare che la FEA non può descrivere perfettamente qusto tipo di fenomeni biologici dal momento che l'osso, essendo un tessuto vivente, non segue le regole matematiche applicate alla FEA.
Il sesto capitolo è incentrato sugli aspetti protesici dell'implantologia odontoiatrica .
Lo schema delle preparazioni, gli aspetti delle finishing lines ed i profili d'emergenza sono presentate in maniera dettagliata e le problematiche a loro collegate sono discusse.
Il capitolo successivo è incentrato sul ruolo dei protocolli protesici riguardanti la stabilità peri-implantare.
Gli aspetti biologici, tecnici e clinici sono discussi conseguentemente.
Molta attenzione è data alla protesizzazione provvisoria ed agli aspetti concernenti il paziente come la pianificazione e la riduzione del fastidio durante la riabilitazione protesica .
Infine l'ultimo capitolo si dedica al titanio, in qualità di materiale principe per l'implantologia odontoiatrica. Particolare enfasi è data alla pulizia delle superfici in titanio quale prerequisito per un'ottima funzionalità.
Per riassumere, il nuovo libro del Dottor Canullo e dei suoi co-autori fornisce una idea di trattamento di implantologia odontoiatrica che include platform switching ed una precisa assistenza protesica affinchè l'esito raggiunto sia un trattamento ottimale del paziente.
Il libro è scritto in maniera chiara e può essere raccomandato a tutti i colleghi di implantologia odontoiatrica.The new book of Dr Canullo, Cocchetto and Loi as an editor is a multi-author textbook with more than 10 contributing authors. The content stretches from basic aspects of implant dentistry all the way to the most modern concepts of platform switching, immediate implant placement and the application of piezo-surgery.
A well-documented (186 references) first basic chapter discusses the various aspects and risks affecting bone modeling and remodeling. Patient related systemic and local factors are identified and evaluated. Three conditions that definitely affect peri-implant bone remodeling, namely systemic, local and surgical factors are described.
In a more clinical, second chapter, flap design and peri-implant tissue stability are discussed in the light of the concept of the biotype and the biologic width.
The third chapter presents the novel concept of minimally invasive implant site preparation applying piezo-surgical techniques.
Quite a number of paragraphs in two comprehensive chapters are devoted to the platform switching concept. This is dealt with both from a theoretical as well as a practical point of view. Emphasis is placed on the histological consequences of this concept. A lot of attention, perhaps too much, is given to the studies on finite element analysis (FEA). These are supposed to describe the effects of platform switching on the marginal bone levels around implants. It has to be kept in mind, however, that FEA cannot reflect such biological phenomena owing to the fact that bone as a living tissue does not follow the mathematical rules that are applied with FEA.
Chapter six is devoted to the prosthetic aspects of implant dentistry. Design of preparations, aspects of finishing lines and emergence profiles are presented in a comprehensive way and pertinent issues are addressed. The clinical concept of a “shoulderless” abutment is discussed. The chapter is illustrated with a few relevant clinical cases to support single issues.
Another chapter presents the role of prosthetic protocols on peri-implant stability. Biological, technical and clinical aspects are discussed in harmony. A lot of attention is given to the temporarisation and to patient-centred aspects such as scheduling and reduction of discomfort during prosthetic rehabilitation.
Finally, the last chapter is devoted to titanium as a material of choice for implant dentistry. Emphasis is given to the cleaning of titanium surfaces as a prerequisite for optimal function.
In summary, the new book by Luigi Canullo and his co-workers provides a implant dentistry treatment concept that includes platform switching and strict prosthetic guidance to reach optimal treatment outcomes. The book is written in a lucid way and may be recommended to all colleagues who are involved in implant dentistry
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
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Mr.Wolf: An Energy-Precision Scalable Parallel Ultra Low Power SoC for IoT Edge Processing
Full text linkThis paper presents Mr. Wolf, a parallel ultra-low power (PULP) system on chip (SoC) featuring a hierarchical architecture with a small (12 kgates) microcontroller (MCU) class RISC-V core augmented with an autonomous IO subsystem for efficient data transfer from a wide set of peripherals. The small core can offload compute-intensive kernels to an eight-core floating-point capable of processing engine available on demand. The proposed SoC, implemented in a 40-nm LP CMOS technology, features a 108-mu W fully retentive memory (512 kB). The IO subsystem is capable of transferring up to 1.6 Gbit/s from external devices to the memory in less than 2.5 mW. The eight-core compute cluster achieves a peak performance of 850 million of 32-bit integer multiply and accumulate per second (MMAC/s) and 500 million of 32-bit floating-point multiply and accumulate per second (MFMAC/s) -1 GFlop/s-with an energy efficiency up to 15 MMAC/s/mW and 9 MFMAC/s/mW. These building blocks are supported by aggressive on-chip power conversion and management, enabling energy-proportional heterogeneous computing for always-on IoT end nodes improving performance by several orders of magnitude with respect to traditional single-core MCUs within a power envelope of 153 mW. We demonstrated the capabilities of the proposed SoC on a wide set of near-sensor processing kernels showing that Mr. Wolf can deliver performance up to 16.4 GOp/s with energy efficiency up to 274 MOp/s/mW on real-life applications, paving the way for always-on data analytics on high-bandwidth sensors at the edge of the Internet of Things
Energy-Efficient Two-level Instruction Cache Design for an Ultra-Low-Power Multi-core Cluster
No full textHigh Energy efficiency and high performance are the key regiments for Internet of Things (IoT) edge devices. Exploiting cluster of multiple programmable processors has recently emerged as a suitable solution to address this challenge. However, one of the main power bottlenecks for multi-core architectures is the instruction cache memory. We propose a two-level structure based on Standard Cell Memories (SCMs) which combines a private instruction cache (L1) per-core and a low-latency (only one cycle latency) shared instruction cache (L1,5). We present a detailed comparison of performance and energy efficiency for different instruction cache architectures. Our system-level analysis shows that the proposed design improves upon both state-of-the art private and shared cache architectures and balances well performance with energy-efficacy. On average, when executing a set of real-life IoT applications, our multi-level cache improves performance and energy efficiency both by 10% with respect to the private instruction cache system, and improves energy efficiency by 15% and 7% with a performance loss of only 2% with respect to the shared instruction cache. Besides, relaxed timing makes two-level instruction cache an attractive choice for aggressive implementation, with more slack for convergence in physical design
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