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Protesi dentale fissa con cantilever supportata da impianti (PDFIC) ultracorti: nostra esperienza clinica
No full textIn questo studio siti edentuli mandibolari posteriori con osso alveolare molto riassorbito di tre pazienti sono stati riabilitati con Protesi dentale fissa con cantilever supportata da impianti (PDFIC) ultracorti e ne è stata valutata la sopravvivenza a due anni (T2) dalla protesizzazione.
MATERIALI E METODI
L'osteointegrazione degli impianti è stata valutata radiograficamente con l'utilizzo di radiografie periapicali, eseguite al tempo 0 (T0 applicazione della protesi), al tempo 1 (T1 a sei mesi) ed al tempo 2 (T2 a due anni), secondo la tecnica del cono lungo con centratore di Rinn e l’ausilio di una griglia millimetrata in rame di dimensioni 31x41 mm, applicata sulla pellicola radiografica , al fine di misurare in mm l'eventuale riassorbimento di osso crestale.
RISULTATI
In tutti e tre i pazienti si è osservato un riassorbimento medio (mesio-distale) della cresta ossea di 0.5 mm a T1; non ci sono state modifiche fra T1 e T2.
CONCLUSIONI
L’utilizzo di impianti corti e ultracorti si è dimostrato essere un’interessante opzione terapeutica e alternativa agli interventi di aumento verticale della cresta ossea, più rapida, più economica e con una ridotta morbilità (1) (2) (3) (4). Nonostante ciò, spesso ci si trova di fronte all'impossibilità di inserire un impianto nel sito edentulo. L'ausilio del cantilever in protesi implantare si è dimostrata essere una buona opzione per sopperire a tali problematiche. (5) (6). L'utilizzo di impianti corti per supportare una protesi con cantilever ha mostrato risultati simili a quelli degli impianti con lunghezze tradizionali (7). Nonostante il numero limitato di pazienti, in questo studio abbiamo osservato come, nei casi di pazienti con quantità di osso alveolare molto limitate, l'utilizzo di impianti ultracorti per supportare protesi dentale fisse con cantilever è da considerarsi una valida opzione terapeutica.Posterior mandibular edentulous ridges with extreme residual bone
resorption within three patients have been rehabilitated using ultrashort implant-supported cantilever fixed dental prostheses (ICFDPs)(one5.0x5.0, three4.5x6, two4.0x5.0 Bicon Dental Implants, Boston, MA, USA) and 2 years survival rate since prosthetic rehabilitation (T2) has been evaluated.
MATERIALS AND METHODS
Implants’ osseointegration has been evaluated at T0 (prostheses insertion) T1 (12 months after prostheses insertion) and T2 (24 months after prostheses insertion) using Periapical x-rays performed accordingly to the long cone paralleling technique and using both a Rinn positioning system and a radiographic template in order to evaluate in millimetres the amount of marginal bone loss in both mesial and distal point.
RESULTS
We have observed an average mesio-distal bone-loss of 0,5 mm at T1 within all the three patients while there hasn’t been any modification between T1 and T2, so as in accordance with other literature works (4).
CONCLUSIONS
Short and ultrashort implants rehabilitation have proven to be a valuable alternative therapy when compared to surgical vertical bone ridge augmentation procedures, the former being more inexpensive, more rapid and presenting less morbidity (1) (2) (3) (4); yet, it could still be impossible to insert an implant on the edentulous ridge. Implant-supported cantilever fixed dental prosthesis is a good option in order to provide such cases (5) (6).The choice of short implants instead of traditional ones as prosthesis’ support has proven to give similar results (7). Despite the limited number of patients, it’s been possible to show that ultrashort implant-supported cantilever fixed dental prosthesis (ICFDPs) is a valuable therapeutic option for patients with reduced amount of bone left.
1 Carl E. Misch, Jennifer Steigenga, Eliane Barboza, Francine Misch-Dietsh, Louis J. Cianciola, Christopher Kazor Short Dental Implants in Posterior Partial Edentulism: A Multicenter Retrospective 6-Year Case Series Study J Periodontol 2006;77:1340-1347.
2 Douglas Deporter, Bunnai Ogiso,Dong-Seok Sohn,Kevin Ruljancich, Michael PharoahUltrashort Sintered Porous-Surfaced Dental Implants Used To Replace Posterior Teeth J Periodontol 2008;79:1280-1286.
3 M. Esposito, G. Cannizarro, E. Soardi, G. Pellegrino, R. Pistilli, and P. Felice, “A 3-year post-loading report of a randomised controlled trial on the rehabilitation of posterior atrophic mandibles: Short implants or longer implants in vertically ugmented bone?” European Journal of Oral Implantology, vol. 4, no. 4, pp. 301–311, 2011).
4 Eduardo Anitua, MD, DDS, PhD, Laura Piñas, Degree of Dentistry; Gorka Orive, PhDRetrospective Study of Short and Extra-Short Implants Placed in Posterior Regions: Influence of Crown-to-Implant Ratio on Marginal Bone LossClinical Implant Dentistry and Related Research 2013
5 Marco Aglietta Vincenzo Iorio Siciliano Marcel Zwahlen Urs Bragger Bjarni E. Pjetursson Niklaus P. Lang Giovanni E. Salvi A systematic review of the survival and complication rates of implant supported fixed dental prostheses with cantilever extensions after an observation period of at least 5 years Clin. Oral Impl. Res. 20, 2009 / 441–451
6 Aglietta M, Iorio Siciliano V, Blasi A, Sculean A, Bragger U, Lang NP, Salvi GE. Clinical and radiographic changes at implants supporting single-unit crowns (SCs) and fixed dental prostheses (FDPs) with one cantilever extension. A retrospective study.Clin. Oral Impl. Res. 23, 2012, 550–555
7 Anka k Ipikcioglu H Finite element stress analysis of the effect of short implants usage in place of cantilever exension in mandibular posterior edentulism Jornal of oral rehabilitation 2002 29; 350-35
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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
STABILITA’ DIMENSIONALE DEL TESSUTO OSSEO PERIMPLANTARE E MANTENIMENTO DELLA PAPILLA: STUDIO RETROSPETTIVO
No full textThe purpose of this study is the retrospective evaluation of DIB value (peri-implant bone tissue dimensional stability) and Jemt Index (papilla preservation) of 47 IAC (Integrated Abutment Crown) over Bicon implants (Bicon Dental Implant, Boston, MA, USA) inserted in 23 patients between October 2009 and January 2013.
MATERIALS AND METHODS: T0 and T1 periapical x-rays performed accordingly to the long cone paralleling technique using a Rinn positioning system and a radiographic template in order to compensate possible distortions have been used in order to evaluate and assess the distance between the implant shoulder and both the first mesial (mDIB) and distal (dDIB) bone contact.(1)
Average values for each implant between T1 and T0 have been calculated, while the Jemt Index has been evaluated from photographs taken at T0 and T1.(2)
RESULTS: IACs of this study have been monitored for an average period of 24,6 month (6 to 48 months) with a survival percentage of 100%; 85% of IACs involved the restoration of posterior sectors.(3) Within 8 cases we could register excessive plaque accumulation(mPLI 1,4) with colour alteration due to technical failure of the initial composite resin polishing; the composite resin, once properly polished, showed to be less irregular than ceramic material(4). Within 3 cases we experienced the failure of the connection, most likely due to the lack of connection itself for the presence of too much soft tissue: 2 stealth abutment of 2mm diameter within frontal sectors restoration and the third one being a 4.4 restoration with a 2mm diameter standard abutment. In all of the three cases the problem has been solved by cleaning the gingival sulcus with the use of a sulcus reamer and by successfully reactivating the connection.
The presence of exudate has been observed in 5 cases; 3 of these cases showed clinical and radiographic evidence of peri-implantitis.
Average Jemt index (both distal and mesial) at T0 resulted to be 0 within 3 cases, 1 within 3 cases, 2 within 29 cases, 3 within 11 cases e 4 in 1 case while we assisted a spontaneous regeneration of the papilla in more than 50% of the cases at T1. We could also assess optimal marginal fit with only 5 cases affected by gingival recession; 2 of these cases regarded frontal sector and have been addressed correcting the IAC to the new marginal position while 3 cases were associated with peri-implantitis of the posterior sector.
CONCLUSIONS: This study shows how IAC system represents a valuable option for the prosthodontics rehabilitation. Optimal marginal fit, bone tissue stability within the bone ridge and papilla preservation are supported thanks to the particular design of the implant neck (sloping shoulder) the emispherical base design and the taper locking connection; thanks to the precision of the crown, the mechanical stability and performance of the bacterial seal and the construction of an individualized profile we are able to realize a highly valuable prosthetic restoration with optimal aesthetics, avoiding cement-induced misfit problems and optimizing every operational time.(5
uprighting pre-protesico con miniviti ortodontiche: un caso clinico con ancoraggio monocorticale
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