252 research outputs found
Computer-assisted implant placement and full-arch immediate loading with digitally prefabricated provisional prostheses without cast: a prospective pilot cohort study
No full textBackground Immediate loading of implant-supported full-arch rehabilitations has become routine practice when treating edentulous patients. The combination of static computer-aided implant surgery (s-CAIS) and digital prosthetic workflow could eliminate several treatment steps and facilitate prostheses delivery. The aim of this study is to evaluate the 1-year results of digitally prefabricated polymethyl methacrylate (PMMA) provisional prostheses without a cast for full-arch computer-assisted immediate loading. Materials and methods A digital pre-operative treatment planning was realized for all patients: dental implants and screw-retained abutments were selected in the planning software and two surgical templates were fabricated for each patient. The first template was mucosa or teeth-supported to drill the holes for fixating pins, while the second template was placed after raising a full-thickness flap and was supported by pins as well as soft or hard tissue distal support. Furthermore, based on the surgical planning, interim prostheses were digitally designed and milled of PMMA resin blocks with subsequent pink resin veneering. Osteotomies and implant placement were performed through the surgical guides and all implants were immediately loaded with prefabricated full-arch interim prostheses directly connected to titanium copings with a flowable resin. Results A total of 55 dental implants were placed in ten patients. In all cases, interim prostheses allowed the insertion of titanium copings without the need of access hole enlargement or adaptation. All the prostheses had 1 year of functional loading to simulate the long provisional phase. No screw loosening occurred at the first removal of the prostheses after implant osseointegration. No fracture occurred during the whole period. After 1 year, the mean marginal bone loss level was 0.37 +/- 0.06 mm, while the implant survival rate was 98.18% (n=54/55), with just one implant failing but not affecting final prosthesis delivery to the patient. Conclusions Within the limitations of the present study, the authors concluded that digitally prefabricated provisional prostheses for full-arch immediate loading with s-CAIS could be a valid alternative treatment modality. Milled PMMA restorations proved to be durable enough during the long provisional phase, without prosthetic complications
Oral health related quality of life in cleft lip and palate patients rehabilitated with conventional prostheses or dental implants
No full textCleft lip and/or palate (CLP) is the most common congenital craniofacial abnormality, with a prevalence of 9.92 per 10,000 live births. In treating patients with CLP, oral rehabilitation is definitely a very important phase of the treatment in order to improve the patient's oral health related quality of life (OH-QoL). The aim of this retrospective study is to assess the OH-QoL in patients rehabilitated with different prosthetic options, thus comparing the conventional treatments, which include removable partial dentures and fixed partial dentures, with the implant-supported prostheses
Efficacy of non-surgical laser therapy for the management of peri-implantitis: A systematic review and meta-analysis
No full textObjective: This systematic review and meta-analysis aimed to evaluate the efficacy of non-surgical laser therapies compared to other treatment modalities for managing peri-implantitis and to analyze post-treatment outcomes of different interventions. Data and Sources: A comprehensive search was conducted across Medline (PubMed), Web of Science, and the Cochrane Central Register of Controlled Trials (CENTRAL), identifying 4675 studies published between January 1953 and November 2023. Study Selection: A total of 15 randomized controlled trials (RCTs) involving 540 patients and 658 implants met the inclusion criteria, with 10 studies eligible for meta-analyses. Meta-analyses revealed that Er:YAG laser therapy significantly reduced bleeding on probing (BOP) by 35.6 % (95 % CI: 17.3 % to 53.9 %; I2 = 83 %) and probing depth (PD) by 0.65 mm (95 % CI: 0.33 to 0.97; I2 = 0 %). The combination of mechanical debridement (MD) and Er,Cr:YSGG laser therapy improved PD by 1.23 mm (95 % CI: 0.76 to 1.70; I2 = 0 %) and reduced BOP by 47.3 % (95 % CI: 38.4 % to 56.1 %; I2 = 0 %). However, none of the therapies showed any significant advantage in preventing crestal bone loss (CBL). Laser therapies did not demonstrate any significant superiority over traditional therapies (p > 0.05). Conclusions: Non-surgical laser therapies, including Er:YAG, Er,Cr:YSGG, Nd:YAG and diode lasers, demonstrated effectiveness in reducing inflammation and probing depths but did not consistently outperform MD alone or in combination with other treatments. The findings emphasize the need for further research and standardized protocols, as no modality significantly prevented CBL. These results provide evidence-based insights into optimizing non-surgical management strategies for peri-implantitis. Clinical significance: Non-surgical laser therapies demonstrate significant reductions in inflammation and probing depths in peri-implantitis treatment. However, their comparable outcomes to mechanical debridement highlight the need for further studies to establish their role and develop standardized protocols for optimized clinical use
“Short term colectomy rate and mortality for severe ulcerative colitis in the last 40 years. Has something changed?”
No full textAortic rupture of acute aortic dissection type treated with thoracic endovascular aortic repair (TEVAR)
No full textAcute aortic dissection (AAD) is one of the most frequent aortic emergencies, which occurs to the vascular specialist. Endovascular reconstruction of the true lumen using minimally invasive stent grafting or stenting has become increasingly popular and widespread among institutions. The aim of this paper is to report a case series composed by twenty-eight patients, who underwent endovascular intervention for acute type B aortic dissections complicated by rupture using thoracic endovascular aortic repair (TEVAR)
Prosthetic rehabilitation with partial removable and aesthetic dentures (Valplast) in a patient with recurrent right TMJ ankylosis: a case report
No full textA fixed mandibular full-arch supported by two different fully tapered dental implant systems: a RCT.
No full textThe aim of this study is to compare the primary stability and the
marginal bone loss (MBL) of fixed mandibular full-arch restorations
supported by two different fully tapered dental implant systems. A non-
inferiority RCT was conducted treating fully edentulous mandibles with
6 implants. Mean MBL levels at the 1 year assessment were 0.47 ±
0.03 mm vs 0.68 ± 0.07 mm in the BLX and NA groups, respectively
(p<0.001). ISQ values were similar among the two groups after 1 year,
with no statistically significant differences
Convex orderings in affine root systems II
No full textAbstractThis paper contains several results concerning convex orderings in root systems. These results complete the analysis developed in earlier papers by the author. We obtain, in the finite case, a combinatorial characterization of reflections, longest elements in standard parabolic subgroups of the Weyl group of the root system, and of Coxeter elements. In the affine case, a refinement of the main construction done earlier by the author (J. Algebra172, 1995, 613–623) is described; moreover, infinite periodic compatible sets are classified
Franciscans and Mathematics. The Case of Mariotto Guiducci, Friar Minor and Abacus Master (1427- Post 1496
No full textIl contributo intende tracciare un profilo del fiorentino Mariotto Guiducci, frate minore e maestro d’abaco del XV secolo, autore di un trattato matematico conservato alla Biblioteca Nazionale di Firenze. Attraverso risultanze archivistiche e bibliografiche edite e inedite, il caso di studio può offrire ulteriori spunti per una riflessione intorno al tema, recentemente ripreso, dei rapporti tra francescanesimo e scienze matematiche fra medioevo e rinascimento. L’indagine proposta si articola in due parti: la prima parte apre uno squarcio sulla famiglia Guiducci e l’insegnamento della matematica pratica a Firenze e a Prato, accennando alla vita conventuale e all’esperienza di insegnante di fra Mariotto; la seconda è dedicata al codice autografo e al Libro d’arismetricha in esso contenuto, espressione di una cultura matematica tipica della tradizione abacistica.The paper focuses on the figure of Mariotto Guiducci, a Florentine franciscan friar and abacus master from the 15th century, author of a mathematical treatise preserved in the National Library of Florence. By archival and bibliographical records, the case study may offer further insights about the topic, recently revived, on the relationship between Franciscanism and the mathematical sciences between the Middle Ages and the Renaissance. The article is divided in two parts: the first opens a glimpse into the Guiducci family and the teaching of practical mathematics in Florence and Prato, hinting at the convent life and experience of Mariotto; the second part is dedicated to the autograph codex and the Libro d’arismetricha, expression of a mathematical culture typical of the abacus tradition
Il fiore e i frutti delle corti. Dal ‘Cortegiano’ ai ‘Ricordi’ guicciardiniani
No full textBaldassar Castiglione e Francesco Guicciardini, che appartenevano alla stessa generazione, si sono con certezza conosciuti di persona, almeno nel periodo in cui hanno servito i papi Leone X e Clemente VII – tra il 1524 e il 1529 (data della morte di Castiglione). Il saggio illustra le differenze radicali di origine e di orientamento dei due, anche rileggendo e rettificando su alcuni punti studi come quello classico del Cian (1940), utile ancora ma di vecchia ispirazione etico-storica. Si esaminano infine alcune tracce della ipotizzata lettura del Cortegiano da parte dell’autore dei Ricordi
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