1,721,432 research outputs found
Minimally invasive transcrestal guided sinus lift (TGSL): A clinical prospective proof-of-concept cohort study up to 52 months
No full textpurpose
this study describes a new procedure for sinus elevation using computer-guided planning and guided surgical approach through the use of computer-aided design (CAD)/computer-aided manufacturing (CAM)-generated surgical template in combination with expander-condensing osteotomes thus providing a minimally invasive surgical technique.
materials and methods
sixty-six consecutive patients were treated with 136 implants placed by transcrestal-guided sinus floor elevation technique and the patients were followed for at least 3 years in function. the drilling protocol is customized based on the bone density of each implant site to achieve an insertion torque ranging between 45 and 55 Ncm. stitanium temporary abutments were connected to the implants with prosthetic screws tightened to 35 Ncm and an acrylic resin provisional restoration was adapted and delivered immediately. six months after initial loading, a definitive CAD/CAM-generated restoration was delivered. outcome measurements assessed were implant and prosthesis survival rate, biological or biomechanical complications, marginal bone level changes, total alveolar ridge bone height before and after procedure, periodontal parameters measured as well as patient's perception of pain levels during recovery period.
results
mean follow-up was 43.96 (range from 36 to 52) months. cumulative implant survival rate was 98.53% at 3 years. no biological or mechanical complications were encountered and no prosthetic failures occurred during the entire follow-up period. mean marginal bone loss (MBL) during the first year of function was 0.33 ± 0.36 mm, while at the 3-year follow-up, the mean MBL was 0.51 ± 0.29 mm. the mean residual bone height of the alveolar crest prior to grafting was of 6.7 ± 1.6 mm (range 5.1–9.2 mm), while, the mean bone height gained was 6.4 ± 1.6 mm (range 3.2–8.1 mm). all patients reported low levels of pain and found to have normal periodontal parameters.
conclusion
this proof-of-concept study suggests that the use of guided surgery to perform transcrestal maxillary sinus floor elevation for alveolar ridge height augmentation is a successful minimally invasive technique for the short- to medium-term follow-up, thus avoiding the extended treatment time and morbidities associated with maxillary sinus floor augmentation
LINGUAL ORTHODONTIC AND ORTHOGNATIC SURGERY: A COMBINED TREATMENT FOR THE AESTHETIC CORRECTION OF SERIOUS MALOCCLUSION
No full textClinical and radiologic experience with moderately rough oxidized titanium implants: up to 10 years of retrospective follow-up
No full textpurpose: the long-term success of machined-surface implants is well documented, whereas the reliability of the moderately rough oxidized implant surface has not been definitively assessed in the long term. the aim of this retrospective study was to assess the long-term clinical and radiologic outcomes of moderately rough oxidized implants supporting fixed prostheses.
materials and methods: seventy-three consecutive patients needing an implant-supported restoration received 1 to 11 implants each (n=167). all implants (82 cylindric and 85 tapered-body implants) had a self-tapping design and a moderately rough oxidized surface and were immediately loaded (n=48) or loaded after a delay (n=113). patients were followed for up to 10 years. outcomes were implant and prosthetic survival rates, peri-implant bone level changes, bleeding on probing, and plaque and gingival indices.
results: one patient (one implant) dropped out. seventy-two patients (166 implants) were followed for at least 8 years (mean, 8.82 years; range, 8.0 to 10.4 years. no implants or prostheses were lost, resulting in a cumulative implant and prosthetic survival rate of 100% after up to 10 years in function. at the final follow-up, the accumulated mean marginal bone loss values were -1.72±1.53 mm (n=27) and -1.27±1.67 mm (n=44) for cylindric and tapered implants, respectively, with no statistically significant difference. bleeding on probing was 12.1%. the cumulative plaque score was 19.7%; 83.8% of patients showed normal gingiva, 10.1% displayed mild inflammation, and 6.1% showed moderate inflammation.
conclusion: this retrospective study of 73 patients treated with either cylindric or tapered-body moderately rough oxidized implants and followed for up to 10 years demonstrated good treatment outcomes with regard to implant survival, marginal bone changes, and soft tissue conditions
Pianificazione, EVA e valore: relazioni e meccanismi di feed-back. Il caso Telecom Italia.
No full textL'articolo analizza le relazioni tra pianificazione, EVA e valore del capitale aziendale.
Il processo di pianificazione definisce gli obiettivi aziendali e le azioni da intraprendere per la realizzazione degli stessi. Il piano aziendale traduce gli obiettivi ed i comportamenti aziendali in termini di grandezze economiche. Assumendo che il fine dell’impresa possa essere rappresentato dalla creazione di valore per gli azionisti, occorre analizzare in che termini il piano aziendale frutto del processo di pianificazione genera valore.
L’EVA rappresenta un utile strumento per misurare i fenomeni di creazione (o distruzione) del valore aziendale. Tale strumento consente dunque di calcolare gli incrementi di valore connessi all’implementazione del piano aziendale.
Le quotazioni di borsa esprimono il valore di mercato del capitale aziendale. Esse pertanto riflettono, in linea di principio, i futuri processi di creazione di valore, misurabili anche tramite l’EVA e determinati dalle strategie codificate nel processo di pianificazione.
Da queste brevi osservazioni appare evidente come pianificazione, EVA e valore di borsa siano tra loro collegati da molteplici relazioni.
Nelle pagine che seguono si analizza come il gruppo Telecom Italia analizza, sviluppa e utilizza i citati elementi per migliorare il processo di pianificazione.
L’articolo dà per scontata la conoscenza del modello EVA e si focalizza solo su questioni applicative
Immediate loading of conical connection implants: Up-to-2-year retrospective clinical and radiologic study
No full textMechanical properties of woven natural fiber reinforced composites
Full text linkEpoxy matrix composites reinforced with woven natural fiber were studied. Composites having fiber volume fraction greater than 55% were prepared by hand lay-up technique. For reinforcement, three different natural fibers were used, jute, flax and silk. The tensile and flexural properties were investigated and the influence of the orientation of fibers on the stiffness were analyzed. It was observed that the tensile and flexural strength of silk composites is almost equal to that of flax composite and 1.98 times that of jute composite. Moreover the stiffness of the silk composites isn't influenced by orientation of fibers. Morphological examinations were carried out using scanning electron microscopy (SEM). All specimens were coated with a thin layer gold alloy prior to SEM observations. A high voltage of 20 kV was used for making the micrographs. The SEM investigation was used to study the fracture surface of the tensile specimens of the composites samples. The results of this study indicate that using silk fiber as reinforcement could successfully develop a composite material in terms of high strength and stiffness to produce a bio-composites for light applications compared to conventional composites
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
Alessandro Bosi, Prefazione, in Alessandra Pozzi, Giovani e opportunità oggi. Per una lettura critica sulle proposte del territorio di Parma e Provincia, Mup, Parma, 2013, pp. IX-XII.
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