1,721,038 research outputs found
Safety of Interproximal Enamel Reduction: a further confirmation
No full textThe objective of this study is to illustrate: a method of SEM digital image processing able to quantify and discriminate between the morphological characteristics of reduced enamel surfaces, when compared with non treated enamel, by treatment with the stripping and finishing technique that proved to be the best in a previous study
Safety of Interproximal Enamel Reduction: a further confirmation
No full textThe objective of this study is to illustrate: a method of SEM digital image processing able to quantify and discriminate between the morphological characteristics of reduced enamel surfaces, when compared with non treated enamel, by treatment with the stripping and finishing technique that proved to be the best in a previous study
Hyperdivergente Classe II, 1 mit groben Fazialwinkel, Protrusion und frontalem Engstad
No full textA hight angle class II with severe crowding in bothe arches is presented. Treatment was carried out by extraction of all first premolars and fixed therapy with MBT sistem and the use of a headgear. The favourable outcome was possible because of the patient's excellent cooperation
Minimally invasive orthodontic therapy to manage eruption problems
No full textOBJECTIVES The purpose of this study was to investigate the therapeutic po-tential of an orthodontic pre-formed oral appliance, belonging to the category of the Eruption Guidance Appliance (EGA). This device is silicone made and it has lots of interesting potential-ity in clinical use. This kind of removable orthodontic device is recommended during an early or a mixed dentition. To analyze the efficiency and the efficacy of this EGA in managing and resolving eruption diseases, the following case is reported. MATERIALS AND METHODS An 8-year and 7 month-old patient, female, was referred to the orthodontist by her dentist for evaluation of malocclusion. The patient presented with symmetri-cal face and a molar and canine Class I malocclusion (according to the Angle classification) and an anterior crossbite in the re-gion of the two upper and lower left central incisors (2.1 and 4.1 area) has been reported. The two incisors were affected by some periodontal diseases. From or-thopantomography it was possible to diagnose the inclusion of the upper left lateral incisor (2.2) and the absence of agenesis. The therapeutic plan, that we have adopted, has provided to treat the young patient with a preformed silicone made orthodontic appliance (LM Activa-torTM). The most advantageous aspect of this device was that it was ex-clusively for night use, for a total of 7-8 hours a day. We describe the anterior cross-bite treated in the early mixed dentition using the eruption guidance appliance as the only therapeutic device. RESULTS The use of EGA allowed the resolution of the anterior crossbite in only 15 days. This was due to the correct repositioning of the upper central incisor (2.1). Furthermore after 45 days from the beginning of therapy the incisal margin of the upper left lateral incisor (2.2) had become well evident in the arch. This type of preformed orthodontic device allowed, therefore, both the resolution of the anterior crossbite, and the eruption of the included element. CONCLUSIONS The results indicate that the Eruption Guidance Appliance is the first choice for an early orthodontic procedure of selected case. It allows to intercept dif-ferent malocclusions during the growth and reduces the need for an additional orthodontic treat-ment, which could cause im-portant diseases to periodontal tissues. Treating orthodontic malocclu-sions in the early mixed dentition through the Eruption Guidance Appliance is an effective method to restore normal and physiologi-cal occlusion. Unfortunately with-out active intervention, there are only a few spontaneous correc-tions to correct growth that can be expected. CLINICAL SIGNIFICANCE The treatment of dental maloc-clusions with this type of intra-oral device certainly guarantees rapid effects. Since the results are very rapid as well as evident, the patient acquires a strong motivation during the therapy. Furthermore, the results are ac-companied by a comfortable management of the device and by a very simple use of it. Both elements promote the patient’s compliance, which is essential for the effectiveness of the treatment itself. Since this type of therapy considers the facial type and the specific characteristics of each individual patient, it can be defined a “custom-ized-therapy”, to all intents and purposes. If the occlusal alterations were early intercepted and treated, further orthodontic treatment would be greatly reduced
Distraction osteogenesis of the Mandible: problems connected with dental movements.
No full textDistraction osteogenesis of the Mandible: problems connected with dental movements.
Distraction Osteogenesis(DO) is a techinique that leads to osseus generation and osteosynthesis by means of slow traction applied to the bone and the soft tissues. The present case shows the forward movement of the mandible using the DO in a skeletal class II iperdivergent patient, with a mandibular retrusion.
DO provides a slower, and thus more "physiological", solution for skeleton malocclusion than the usual traditional techniques. It is necessary, however, to follow up surgery with an appropriate orthodontic finalization
Orthodontic glass-fiber reinforced composites (G-FRCs) with different storage modality dry and wet versus orthodontic twisted wires: a three-point bending test at 5 mm of span lenghts.
No full textScopo del presente lavoro è quello di evidenziare eventuali analogie e differenze nel comportamento meccanico dei compositi rinforzati con fibre di vetro (G-FRCs) quando analizzati in condizioni di conservazione differente (ambiente umido e ambiente secco), nonché di confrontare le caratteristiche meccaniche dei G-FRCs con quelle dei tradizionali fili intrecciati in acciaio, comunemente utilizzati per la contenzione fissa postortodontica nei settori anteriori dell’arcata mascellare e mandibolare. Per ogni campione è stato effettuato un test di flessione (three-point bending test) con distanza tra i supporti di 5 mm, al fine di simulare il più possibile la situazione clinica. A parità di distanza tra i supporti di 5 mm e di deflessione pari a 1 mm, i G-FRCs conservati in ambiente umido (Gruppo A1) raggiungono valori di massimo carico e massimo stress inferiori ai G-FRCs conservati in ambiente secco (Gruppo A2) e sovrapponibili a quelli ottenuti dai test effettuati sui fili ortodontici intrecciati in acciaio (Gruppo B). L’analisi statistica ha evidenziato differenze statisticamente significative tra i Gruppi A2 e B (p < 0,001) e non statisticamente significative tra i Gruppi A1 e B (p < 0,088). Questo studio confronta le proprietà meccaniche di due diversi materiali utilizzati in ortodonzia per la realizzazione di contenzioni fisse e mette in evidenza l’effetto del tipo di conservazione (secco/umido) sulle proprietà meccaniche degli stessi. The aim of this study was to highlight analogies and differences on flexural properties of G-FRCs in different storage conditions: dry and wet, and to investigate the flexural properties of orthodontic G-FRCs vs stainless steel twisted retainers. For each sample a three-point bending test was carried out with a material testing machine. Condition being equal (span length and deflection) the wet fibers reach inferior loads, showing characteristics more similar to steel and demonstrate more elasticity compared to the dry fibers. However, the steel wire, reach loads much inferior than the glass fibers and demonstrate more elasticity compared to the glass fibers dry and wet. The different material and the different storage modality (dry and wet) significantly influenced the maximum load and the maximum stress (p < 0.001). In all the tests carried out no samples showed complete fractures, but microfractures clinically was observed as white spots
Postura ed occlusione: esame dei rapporti fra disgnazie e scoliosi in un campione di popolazione
No full text
Corrosion in Orthodontic Material and in vitro and in vivo study.
No full textThe present stdy in intended to compare in vitro and in vivo the corrosion resistance of Stainless steel when traditionally soldered and when laser welded. Orthodontic appliances were studied: Sem analysis, Edax and Weigt change was performed. Our study showed that laser welded samples have superior resistance to corrosion
Liver transplantation in a patient with complete portal vein thrombosis, is there a surgical way out? A case report
Full text linkIntroduction: Due to the complexity of the surgical procedure portal vein thrombosis (PVT) has long been considered an absolute contraindication to liver transplantation (LT). The presence of a large splenorenal shunt (SRS) could make portal anastomosis a valid option.Presentation of case: We report the case of a 37-year-old female patient with Grade III PVT and a large SRS, who underwent orthotopic LT. Liver was implanted using a 1992-Belghiti piggyback technique and portal anastomosis was performed using the large spleno-renal shunt. We observed good graft reperfusion and postoperative Doppler ultrasound showed normal portal vein flow. She was discharged on postoperative day 7, with an excellent graft function. At six months follow-up, patient is alive with normal hepatic vascularization.Discussion: Due to paucity of reports, there is currently no consensus on the indication to LT and/or surgical technique. In the present case, once the transplant benefit was evaluated, the Grade III PVT was not considered a contraindication to LT.Conclusion: The presence of a Grade III PVT associated with a large SRS should not be considered a contraindication for LT, and the use of the shunt vein should be considered a feasible option to perform portal anastomosis. (C) 2016 The Author(s). Published by Elsevier Ltd on behalf of IJS Publishing Group Ltd
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