184 research outputs found
Leonardo da Vinci e il lago di Serravalle
No full textPer i principali ingegneri del Rinascimento il controllo dell’acqua era alla base delle attività agricole, commerciali, industriali e militari. Leonardo cresce e opera in un periodo, il Rinascimento, nel quale, oltre a magnifici capolavori architettonici e artistici, sono realizzate e ampliate le grandi opere idrauliche, quali la rete dei bottini dell’acquedotto sotterraneo di Siena e i Navigli di Milano. L’elemento acqua diventa una costante degli studi del Genio che approfondisce in maniera multidisciplinare vari temi tipici della meccanica dei fluidi. Riflessioni sul moto dell’acqua e sulla sua natura si risolvono in arditi progetti di ingegneria idraulica e di macchine destinate alle produzioni più varie, che sfruttano come forza motrice proprio la potenza dell’acqua. Nelle opere di Leonardo, il disegno è la chiave con cui si penetra nel mondo dei fenomeni. In tale quadro, la rappresentazione del dettaglio tecnologico costituisce il punto di contatto del piano ideale rappresentato dall’intuizione/osservazione leonardiana con quello fattuale in cui l’idea si traspone simbolicamente nell’antropizzato. Esempi di tali trasposizioni sono le “anotomie” dei corsi d’acqua, nelle quali possono ricomprendersi il progetto del lago artificiale e le planimetrie di fiumi e canali, nonché i molti dispositivi idraulici per la risoluzione di problematiche concrete ed ancora attuali. In tale quadro, possono altresì ricomprendersi le ideazioni di Leonardo relative a sistemi di pompaggio per addurre l’acqua alle abitazioni, alle vie d’acqua per il trasporto e la movimentazione di merci, alle reti fognarie a servizio delle abitazioni, nonché al progetto di deviazione del corso del fiume Arno in Toscana, mirante a dare uno sbocco al mare ai fiorentini. Per il suo territorio natio, l’unico progetto certo ideato da Leonardo da Vinci e giunto fino ai giorni nostri è quello di un lago artificiale di cui di seguito si procederà all’approfondimento
Monitoraggio della contaminazione da plastica del litorale marino e centro urbano di Marina di Carrara e Canale Lunense (Novembre 2019 – Ottobre 2020)
No full textMembranes and Bone Substitutes in a One-Stage Procedure for Horizontal Bone Augmentation: A Histologic Double-Blind Parallel Randomized Controlled Trial
No full textThe aim of this histologic, double-blind, parallel, randomized controlled trial was to compare anorganic bone mineral-collagen membranes (BB) and betatricalcium phosphate-pericardium collagen membranes (CJ) in a one-stage procedure for horizontal bone augmentation. A biopsy was performed in the regenerated area at abutment connection 6 months after surgery. Five patients were assigned and treated with the BB combination and five patients were treated with the CJ combination. At abutment connection, 6 months after grafting, no significant differences were evident in the histomorphometric comparisons, even if the percentage of residual graft, using the marrow spaces and soft tissue as a reference, tended to be greater in the CJ group (P = .0759)
Clinical Management of Facemasks for Early Treatment of Class III Malocclusion: A Survey among SIDO Members
No full textTo evaluate whether there are differences among orthodontists in the clinical management of facemask treatment for early treatment of Class III malocclusion, a survey consisting of 16 questions was conducted among members of the Italian Society of Orthodontics (SIDO). Sixty percent of the respondents were Specialists in Orthodontics (S) whereas 40% were General Dentists practicing Orthodontics (GD). Descriptive statistics were calculated to summarize the collected data. Differences in answers between S and GD were assessed with the Fisher’s exact test for dichotomous variables, chi-square test for qualitative variables, and Mann–Whitney test for ordinal variables. A total of 151 clinicians participated in this survey. As for treatment timing, about 80% of the participants reported treating Class III patients with RPE and facemask between 5 and 8 years of age. Most of the participants requested the patients to wear the facemask in the afternoon and at night for a period of 9 or 12 months with recommended forces of 500 g per side. Comparisons between S and GD showed that S preferred the Petit facemask whereas GD favored the Delaire’s type facemask (Fisher’s Exact test, p = 0.0005). S and GD also differed significantly in their judgment of the most critical time of treatment, which for the majority of GD was the initial period but for the S was the final period (Chi-square test p = 0.0188). This survey showed that the facemask is not well received by the patients who, along with their parents, express concerns regarding its tolerability
A novel piezoelectric-assisted non-surgical periodontal treatment: a prospective case series
No full textThe purpose of this study was to evaluate the clinical efficacy of a non-surgical periodontal treatment using a piezoelectric power-driven device with a novel insert. Plaque index (PlI), bleeding on probing (BoP), probing depth (PD), recession depth (Rec) and clinical attachment level (CAL) were assessed at 6 weeks, 3 months and 6 months. Furthermore, tooth mobility and furcation involvement were recorded and chewing discomfort and dental hypersensitivity were evaluated. Eighteen stage I to IV periodontitis patients providing 437 teeth and 2622 sites in total were analyzed. At six weeks, CAL gain (0.4; p < 0.0001), PD reduction (0.4; p < 0.0001) and Rec increase (0.1; p = 0.0029) were statistically significant. Similarly, the mean number of sites with PD > 4 mm and absence of BoP significantly decreased between baseline and 6 weeks (−12.7; p < 0.0001). At this time point, the patient’s chewing discomfort was also significantly diminished (1.4; p = 0.0172). Conversely, no statistically significant changes were observed between 6 weeks and 3 months and between 3 months and 6 months for any of the clinical variables evaluated. In conclusion, within the limitation of this study, mechanical piezo-assisted non-surgical periodontal treatment in conjunction with an innovative tip resulted significantly efficacious to reduce pathological periodontal pockets, to gain clinical attachment and to reduce gingival inflammation
Traduzione e (auto)commento nei volgarizzamenti italiani antichi
No full textIl contributo si propone di censire e passare in rassegna i volgarizzamenti italiani antichi che presentano, nella propria tradizione manoscritta, un corredo esegetico coevo in volgare. Si propongono quindi riflessioni su alcuni aspetti di tale tipologia testuale, quali il ruolo dell'autore (o degli autori), le fonti dei commenti, la mise en page di testo e commento nei manoscritti, le dinamiche di trasmissione del paratesto, il trattamento editoriale di quest'ultimo nelle edizioni critiche dei volgarizzamenti.
This contribution surveys early Italian vernacular translations whose manuscript tradition preserves a contemporary vernacular exegetical apparatus. It examines key features of this textual typology, including the role of the author (or authors), the sources of the commentaries, the mise en page of text and commentary in the manuscripts, the transmission of paratextual material, and its treatment in modern critical editions of vernacular translations
Significance of a simplified method for periodontal risk assessment in predicting periodontitis recurrence during supportive periodontal therapy: a retrospective cohort study
No full textAim: To evaluate whether patient-related risk scores generated with a simplified method for periodontal risk assessment (UniFe; Trombelli et al. 2009) may predict periodontitis recurrence during supportive periodontal therapy (SPT).
Material and Methods: At 2 clinical centers, data were retrospectively obtained from the record charts of 109 patients (age range: 22–62 years). According to the individual treatment plan, patients had undergone active periodontal therapy (APT) and had been enrolled in a SPT program for a mean of 5.6 2.2 years. Patient-related risk scores referred to the first visit following APT were calculated on a scale from 1 (low risk) to 5 (high risk) according to UniFe. Patients were grouped according to risk scores and compared for tooth loss as well as
changes in radiographic bone levels and pocket probing depth (PPD) occurred during SPT.
Results: After APT, 5, 6, 20, 65, and 13 patients showed a risk score of 1, 2, 3, 4 and 5, respectively. The mean number of teeth lost during SPT ranged from 0 to 1.8 2.5 teeth in patients with a risk score of 1 and 5, respectively (p = 0.041), with a mean yearly rate between 0 (risk score 1) and 0.32 0.51 teeth/year (risk score 5) (p = 0.053). Mean bone loss and PPD increase during SPT were both ≤0.50 mm in all
risk groups, without inter-group differences.
Conclusion: Within its limits, the present study indicate that risk assessment according to the UniFe method may help to identify patients at risk for tooth loss during SPT
The Multilayer GBR Technique: An Alternative Approach for One-Stage Transmucosal Implant Placement in the Presence of Horizontal Defects. A Case Series
No full textThis study presents a one-stage technique for horizontal guided bone regeneration and transmucosal implant placement in the presence of hard and soft tissue defects. The proposed technique uses autologous bone particles, deproteinized bovine bone matrix, collagen membranes, and concentrated growth factor membranes to create a multilayer barrier and enhance tissue regeneration. Four patients were treated with a total of seven implants. Digital analyses of intraoral scan data taken at baseline and at 6 months postsurgery showed a mean increase in tissue volume of 157.4 mm(3). The patient satisfaction was high, and no complications were observed
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