200,242 research outputs found
Coronally advanced flap: a modified surgical approach for isolated recession-type defects: three-year results.
No full textVarious modifications of the coronally displaced flap have been proposed in the literature with the attempt of treating gingival recession with uneven predictable results. The goal of the present study was to evaluate the effectiveness with respect to root coverage of a modification of the coronally advanced flap procedure for the treatment of isolated recession-type defects in the upper jaw. Methods: Forty isolated gingival recessions with at least 1 mm of keratinized tissue apical to the defects were treated with a modified approach to the coronally advanced flap. The main change in the surgical procedure consisted in the modification of flap thickness and dimension of surgical papillae during flap elevation. All recessions fall into Miller class I or II. The clinical re-evaluation was performed 1 year and 3 years after the surgery. Results: At the 1-year examination, the average root coverage was 3.72 ± 1.0 mm (98.6% of the pre-operative recession depth) and 3.64 ± 1.1 mm (96.7%) at 3 years. The gain in probing attachment amounted to 3.65 ± 1.10 mm at 1 year and to 3.70 ± 1.09 mm at 3 years. The average increase of keratinized tissue between the baseline and the 3-year follow-up amounted to 1.78 ± 0.90 mm. All changes of keratinized tissue (difference between baseline and 1 year, baseline and 3 years, and between 1 and 3 years) were statistically significant. Conclusion: The modified coronally advanced surgical technique is effective in the treatment of isolated gingival recession in the upper ja
Palatal graft harvesting techniques: A narrative review
No full textOBJECTIVES According to the American Acade my of Periodontology, soft tissue grafting consists of harvesting soft tissue that is completely detached from the donor site and placed in a properly prepared recipient bed. The harvesting of soft tissue from the palate is a technique used in periodontics for over fifty years and still in continuous evolution. From free gingival grafting to bilaminar techniques with connective tissue only or free gingival grafts disepithelized extra-orally, several techniques have been proposed over the years, some of which are now part of today’s periodontal plastic surgery. These techniques are designed to increase periodontal soft tissue thickness, restore a proper keratinized tissue width, correct muco-gingival deformities, improve aesthetics, allow correction of peri-implant de hiscences, soft tissue augmenta tion and ridge preservation, in or der to limit post-extraction bone crest alteration in aesthetically rel evant areas. MATERIALS AND METHODS This narrative review considers the main techniques of soft tissue harvesting from the palate as described in the literature, from the trap-door proposed by Edel in 1974 to the free gingival graft disepithelialized extra-orally proposed by Zucchelli, through a series of single incision techniques introduced over the years. The examination of the grafting techniques is followed by the analysis of the donor area (lateral palate or maxillary tuber) in terms of tissue quality, composition and thickness, difficulties and complications of the surgery. Wound healing and post-operative discomfort are also explored, evaluating the main differences between techniques involving an epi thelial-connective graft and techniques involving only a connective graft. In particular, the use of donor site protectors, such as cyanoacrylate adhesives and PRF (Platelet-Rich Fibrin), is considered. Finally, possible complications are considered − from intra-operative and post-operative bleeding, treatable by compression with wet gauze and tranexamic acid − to less frequent complications such as flap laceration and donor site infection. RESULTS AND CONCLUSIONS The most indicated technique seems to be the harvesting of an extra-orally disepithelized free gingival graft. This bilaminar technique, besides having shown the best clinical results, is also easier to perform, in a reduced operative time and with a lower risk of damaging vascular structures; moreover, the graft composition is richer in connective tissue, without contamination of adipose or glan dular tissue of lower quality. On the other hand, its harvesting technique implies second inten tion healing at the donor site, which may be less comfortable for the patient, but without increasing post-operative pain. In addition, the use of a donor site protection appears to further reduce possibile post-operative patient morbidity. CLINICAL SIGNIFICANCE The use of an extra-orally disepithelized free gingival graft as part of a bilaminar technique can be considered the gold standard among the soft tissue augmentation techniques, possibly accompanied by the use of donor site protections
A novel biopsy technique for lesions involvinginterproximal soft tissues
No full textBackground: Biopsy of soft tissues around teeth can cause periodontal deficiency with several side effects. When the neoformation involves frontal areas biopsy often induces an aesthetic impairment, particularly critical when the interdental papilla is entailed. Description of the procedure: A new surgical approach to treat lesions involving interdental tissues is described. The flap design is characterized by a sub-marginal scalloped incision, possibly confined into the keratinized tissue at the vestibular side. The incision starts 1 mm above the lesion, in the midline between the two confining teeth. With a parabolic shape, the incision reaches the gingival margin at the distal line angle of the distal tooth. Hence, another parabolic incision is performed connecting the starting point with the marginal mesial line angle of the mesial tooth. After this step, two options are applied depending on the lesion extension. When the lesion is confined coronally to the line connecting the gingival margin zeniths of the two adjacent teeth, oblique linear incisions are performed till to the gingival margin zeniths. Otherwise, when the lesion extends beyond this line, two parabolic incisions are per-formed on both adjacent teeth, till to the distal and mesial line angle respectively. Specific anatomic measurements rule up the incisional design. For the palatal/lingual side, the incision follows the principles of a general excisional procedure. Intrasulcular incisions are then made and the lesion with surrounding tissues are collected for examination. Both full-thickness and split-thickness are used for the buccal flap elevation. De-epithelized the adjacent anatomic papillae, two sling sutures are used to stabilize the entire flap to the most feasible coronal position. Generally single sutures are used for the palatal side and the eventual graft. Outcomes: All 9 cases treated so far have ever shown an esthetically satisfying outcome without recurrence or adverse events. Conclusions: This technique allows clinician to restore gingival health preserving aesthetics and function
Waveform decoding and detection in hdEEG
No full textBrain oscillations are very powerful descriptors of both physiological and pathological brain states. In general, EEG signals consist of complex mixtures of components whose characterization provides reliable information about the neuronal activity. This study is inspired to the {\em consensus matching pursuit} (CMP) representation and proposes an effective method for the detection and modeling of interictal prototypical signal patterns in temporal lobe epilepsy. CMP allows accounting for inter-trial variability in temporal jitter, frequency and number of oscillations. In this work, we propose to generalize the approach and exploit the resulting spike representation for automatic interictal spike detection. Performance was evaluated on both synthetic and real high density EEG signals. Results show high sensitivity and specificty in spike detection as well as an accurate separation in the transient and oscillation components
Ionospheric Observatory Development At Mario Zucchelli Station
No full textSince 1995 Italian Ionospheric Antarctic Observatory at Terra Nova Bay, now “MARIO ZUCCHELLI”, station (geographic coordinates: 74.70°S, 164.11°E) performs continuous and systematic ionospheric vertical soundings. Long time series of continuous and accurate ionospheric observations (more than one solar cycle) are necessary for a deeper understanding of the complex phenomena occurring in the upper atmosphere at high latitude; furthermore high rate soundings (at least four soundings per hour or more) contribute to the short-time prediction of the radiopropagation conditions and to the Space Weather.
During 2003–2004 Antarctic campaign a new digital ionosonde, recently developed at the Istituto Nazionale di Geofisica e Vulcanologia (INGV) in Rome, (Italy), has been installed the Ionospheric Observatory and preliminary tests have been carried out. This new Advanced Ionospheric Sounder-INGV, briefly AIS, is integrated in a stand alone system during winter time: the sounding, device settings and data sending to Rome are completely automatic and remote programmable. Ionograms are available on line at the INGV web and ftp server.
The new features of the Ionospheric Observatory are presented and preliminary statistics on the reliability and validation of the experimental observation are shown and discussed.Published1.7. Osservazioni di alta e media atmosfera3.9. Fisica della magnetosfera, ionosfera e meteorologia spazialeope
Delamination localisation and length estimation in composite laminate beam by VSHM and pattern recognition methods
No full textThe focus of this work is to investigate the delamination damage in laminate composite beams, to fix a Vibration-based structural health monitoring (VSHM) method for the laminate structures. The analysis is concentrated on the vibration characteristics of the samples and, in particular, the attention is addressed on the first several natural frequencies of a composite laminate beam with a delamination damage. The core of this work is an experimental investigation on the vibration response of a composite laminate beam and its changes caused by delaminations with different sizes and in different locations of the beam. The study is divided in 3 sections: delamination detection, delamination localization, and delamination estimate. The aim is to determine how the first six harmonics frequencies change due to the delamination, and the results show that they can be successfully used to investigate the presence, the location and the dimensions of the delamination in a composite beam. A Pattern Recognition analysis is used to locate the damage, while the detection and the evaluation are done using the changes in the harmonic frequencies. A finite element analysis is performed, and the variations of the natural frequencies due to delamination are in good agreement with the experimental results
Ionospheric Observatory Development At Mario Zucchelli Station
No full textSince 1995 Italian Ionospheric Antarctic Observatory at Terra Nova Bay, now “MARIO ZUCCHELLI”, station (geographic coordinates: 74.70°S, 164.11°E) performs continuous and systematic ionospheric vertical soundings. Long time series of continuous and accurate ionospheric observations (more than one solar cycle) are necessary for a deeper understanding of the complex phenomena occurring in the upper atmosphere at high latitude; furthermore high rate soundings (at least four soundings per hour or more) contribute to the short-time prediction of the radiopropagation conditions and to the Space Weather.
During 2003–2004 Antarctic campaign a new digital ionosonde, recently developed at the Istituto Nazionale di Geofisica e Vulcanologia (INGV) in Rome, (Italy), has been installed the Ionospheric Observatory and preliminary tests have been carried out. This new Advanced Ionospheric Sounder-INGV, briefly AIS, is integrated in a stand alone system during winter time: the sounding, device settings and data sending to Rome are completely automatic and remote programmable. Ionograms are available on line at the INGV web and ftp server.
The new features of the Ionospheric Observatory are presented and preliminary statistics on the reliability and validation of the experimental observation are shown and discussed.Published1.7. Osservazioni di alta e media atmosfera3.9. Fisica della magnetosfera, ionosfera e meteorologia spazialeope
Multiple papilla preservation technique: A conservative approach for the access to multiple horizontal bone defects in aesthetic areas of the mouth.
No full textMultiple papilla preservation technique: A conservative approach for the access to multiple horizontal bone defects in aesthetic areas of the mouth
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