PubMed Health⌕ Search

Biomedical subjects

M Politi

Publications and source records attributed to M Politi.

At least 37 records · Page 2Linked to original sources
PubMed2002

Osteogenesis distraction and platelet-rich plasma for bone restoration of the severely atrophic mandible: preliminary results.

PURPOSE: The purpose of this study was to evaluate a new method of restoring severe atrophic mandible using platelet-rich plasma (PRP) during distraction osteogenesis. MATERIALS AND METHODS: Since 1999, 2 men and 3 women with severe atrophy (Cawood and Howell classes V and VI) of a completely edentulous mandible have been treated with a novel distraction procedure. During the surgery, a mixture of autologous bone graft, harvested from the iliac crest, and an autologous platelet concentrate, obtained from platelet-rich plasma, filled the distraction gap. This mixture constituted an autologous bone-platelet gel that was used to create a useful bony scaffold for distraction regenerate. After a latency period of 15 days, a distraction run of 0.5 mm/d, and a 60-day period of consolidation, the distraction device was removed and implants were placed simultaneously. RESULTS: In all treated patients, planned distraction height was achieved with a considerable enhancement of bony regeneration, and in all cases it was possible to place implants at a planned time. CONCLUSIONS: The combination of these recent and innovative regenerative methods seems to be effective in restoring the severe atrophic mandible.

Alveolar Bone Loss↗
PubMed2002

Prognostic trend in advanced implant surgery.

BACKGROUND: Implant surgery in association with bone grafting is generally considered less predictive than primary implant surgery. Many reports have been published about implant rehabilitation with bone grafts in atrophic patients. Most of these papers showed a lower implant success rate than primary implantology. The aim of this study is to verify if it's possible to warrant similar results between the two types of implantology, if such procedures are performed following effective protocols and criteria. METHODS: From 1995 to 1999, 43 severely atrophic edentulous patients were treated in our Clinic with 63 autologous bone grafts and delayed implantology; 45 patients were treated with traditional implantology. 284 fixtures were positioned. The success rate in grafted implantology versus traditional implantology was compared for every maxillary and mandibular region. Furthermore, success rate in implantology of the anterior maxilla versus the poster maxilla in grafted patients was compared. The statistical considerations were performed with c2 test (p<0.05). RESULTS: The statistical analysis evidenced not significative difference in the implant success rate between grafted and not grafted patients in the anterior (p=0.23) and in the posterior maxilla (p=0.35). There was not significative difference in the implant success rate between grafted and not grafted patients in the anterior mandible (p=0.54) and in the posterior mandible (p=0.54). There was not significative difference in the implant success rate between the anterior and posterior grafted maxilla (p=0.21). CONCLUSIONS: The results obtained show that if close surgical protocol is performed it is possible to obtain no prognostic difference between the two METHODS.

Adult↗
PubMed2001

Antioxidant principles from Bauhinia tarapotensis.

A new cyclohexenone (1) and a new caffeoyl ester derivative (2), together with the known compounds (-)-isolariciresinol 3-alpha-O-beta-D-glucopyranoside (3), (+)-1-hydroxypinoresinol 1-O-beta-D-glucopyranoside (4), isoacteoside (5), luteolin 4'-O-beta-D-glucopyranoside (6), and indole-3-carboxylic acid (7), were isolated from the leaves of Bauhinia tarapotensis. The structures of these new compounds were determined by spectroscopic data analysis. The antioxidant activities of 1-7 were determined by measuring their free radical scavenging effects, using the 1,1-diphenyl-2-dipicrylhydrazyl free radical (DPPH) and Trolox equivalent antioxidant activity (TEAC) methods, and the coupled oxidation of beta-carotene and linoleic acid. Compounds 3-5 showed good activities in the DPPH and TEAC tests, while compounds 1 and 2 were active in the coupled oxidation of beta-carotene and linoleic acid bioassay.

Antioxidants↗
PubMed2001

A technique for remodeling the antihelix to correct the prominent ear.

PURPOSE: This report presents a simplified and quick surgical method for correction of the prominent car. PATIENTS AND METHODS: Fifty otoplasties in 29 patients were performed to reshape the antihelix. The technique was based on the Stenstrom method plus use of the Kaye suture. RESULTS: No major complications were observed while using this method, and good aesthetic results were obtained. CONCLUSIONS: This surgical technique represents an easy, rapid, and safe method to reshape the antihelix.

Ear Cartilage↗
PubMed2001

Stability of sagittal split ramus osteotomy used to correct Class III malocclusion: review of the literature.

Setback of the mandible to correct mandibular prognathism is a well-known procedure. The 2 most frequently used techniques are the intraoral vertical ramus osteotomy (IVRO) and the sagittal split ramus osteotomy (SSRO). Although SSRO has been performed for many years, few data exist concerning long-term skeletal stability, and different hypotheses have been suggested to explain potential relapse. The literature published between 1985 and the present concerning this procedure was reviewed, and the authors analyze and discuss skeletal stability and factors contributing to relapse.

Bone Wires↗
PubMed2001

Stability of skeletal Class III malocclusion after combined maxillary and mandibular procedures.

The aim of this study was to evaluate the skeletal stability and time course of postoperative changes after surgical correction of skeletal Class III malocclusion. Combined maxillary and mandibular procedures were performed in 40 consecutive patients. Bilateral sagittal split osteotomy stabilized with wire osteosynthesis for mandibular setback and low-level Le Fort I osteotomy stabilized with plates and screws for maxillary advancement were performed. Maxillomandibular fixation (MMF) was in place for 6 weeks. Lateral cephalograms were taken before surgery, immediately postoperatively, 8 weeks after surgery, and 1 year postoperatively. Patients were divided into 2 groups according to vertical maxillary movement at surgery: a maxilla-up group with upward movement of the posterior nasal spine of 2 mm or more (group 1, n = 22), and a minimal vertical change group with less than 2 mm of vertical repositioning (group 2, n = 18). The results indicate that surgical correction of Class III malocclusion with combined maxillary and mandibular osteotomies appears to be fairly stable. One year postsurgery, maxillary stability was excellent, with a mean horizontal relapse at point A that represented 10.7% of maxillary advancement in group 1 and 13.4% in group 2. In the vertical plane, maxillary stability was also excellent, with a mean of 0.18 mm of superior repositioning at point A for group 1 and 1.19 mm for group 2. The mandible relapsed a mean of 2.97 mm horizontally at pogonion in group 1 (62% of mandibular setback) and 3.41 mm (49.7% of setback) in group 2. Bilateral sagittal split osteotomy with wire osteosynthesis and MMF was not as stable as maxillary advancement and accounted for most of the total horizontal relapse (almost 85%) observed. A trend to relapse was observed for maxillary advancement greater than 6 mm, while the single variable accounting for mandibular relapse in group 1 was the amount of surgical setback. Clockwise rotation of the ascending ramus at surgery was not correlated with mandibular relapse in relation to the type of fixation performed and therefore does not seem to be responsible for relapse.

Adult↗
PubMed2000

Review of segmental and marginal resection of the mandible in patients with oral cancer.

This paper reviews the medical literature of the last decade to ascertain the criteria used to assess mandibular invasion by cancer of the oral cavity and to suggest how best to evaluate the mandible with a view to surgical management. It is generally agreed that patients with mandibular invasion should be treated surgically, but the extent of mandibular resection required remains a controversial matter and the accurate preoperative determination of neoplastic invasion of the mandible remains a challenge for head and neck surgeons. The relative reliability of preoperative orthopantomography, (OPG) bone scanning, computed tomography (CT) and magnetic resonance imaging (MRI), and of peroperative periosteal stripping and direct inspection in clinical assessment for mandibular surgery, is discussed. The histological patterns of tumor invasion and the most common routes of tumor entry in the mandible are described and the influence of variables such as prior radiotherapy and an edentulous vs a dentate state in relation to perineural invasion are also discussed. Finally, a comparison is drawn between the reported outcome of marginal vs segmental resection procedures and a decision-making algorithm is proposed. In selected cases, marginal mandibulectomy can ensure satisfactory tumor control, with a favorable effect on the morbidity associated with mandibular surgery.

Humans↗
PubMed2000

Is extended selective supraomohyoid neck dissection indicated for treatment of oral cancer with clinically negative neck?

Oral cavity tumors may develop occult metastases to the cervical lymph nodes. Current imaging techniques and routine histopathologic methods may fail to detect lymph node micrometastases, but the surgeon has to electively dissect a neck at risk of developing clinical disease. Supraomohyoid neck dissection has been the elective surgery for treating a clinically negative neck in patients with oral cavity primaries. A literature review revealed that level IV nodes can be significantly affected by occult disease with and without metastases in level I-III lymph nodes. This means that level IV nodes have to be included in the supraomohyoid neck dissection, resulting in a more extensive surgical procedure to ensure a margin of oncological safety.

Humans↗
PubMed2000

Stability of Le Fort I osteotomy in maxillary inferior repositioning: review of the literature.

Inferior repositioning of the maxilla to correct vertical maxillary deficiency has been one of the more unstable orthognathic procedures performed. This kind of maxillary movement is the logical correction of short face syndrome due to maxillary vertical deficiency, but in spite of the esthetic improvement that it produces, a great tendency to relapse was observed. Unfortunately, the procedure is relatively rare, and this is reflected in the small sample of the studies. The literature concerning the stability of Le Fort I osteotomy in maxillary inferior repositioning was reviewed to analyze and discuss the stability of the surgical techniques proposed.

Animals↗
PubMed1999

Stability of Le Fort I osteotomy in maxillary advancement: review of the literature.

Stability of the skeletal segments repositioned during orthognathic surgery is still a concern in maxillofacial surgery. In an attempt to establish a consensus about one of the most frequently performed repositioning surgeries, the literature from 1985 to 1999 concerning stability of Le Fort I osteotomy in maxillary advancement was reviewed. There have been many problems in interpreting the results of the analysis because of differences in the design of the studies and the multifactorial nature of the disorder. For this reason each problem that emerged in the literature is analyzed and discussed.

Humans↗
PubMed1998

Truncal anaesthesia of the maxillary nerve for outpatient surgically assisted rapid maxillary expansion.

We present our experience of transcutaneous truncal anaesthesia of the maxillary nerve in association with transmucosal anaesthesia of the sphenopalatine ganglion in surgically assisted rapid maxillary expansion. Twelve patients with a skeletal transverse discrepancy of the maxilla were treated in our department from 1994 to 1995. Maxillary transcutaneous nerve block was done with a Quincke 8 cm spinal needle together with transmucosal anaesthesia of the sphenopalatine ganglion. Mepivacaine without adrenaline and sodium bicarbonate 1/10 was used for truncal anaesthesia and lidocaine-prilocaine cream for transmucosal anaesthesia. A Le Fort I osteotomy, lateral nasal wall osteotomy, pterygomaxillary osteotomy, and a palatal osteotomy were done for all patients before the maxillary expansion. Total anaesthesia of the maxillary area facilitated the operations and appreciably reduced the amount of postoperative pain. The ease of achieving effective anaesthesia before and after operation and the absence of side-effects make this form of anaesthetic particularly useful in surgically assisted rapid maxillary expansion.

Adolescent↗
PubMed1998

Simultaneous malaroplasty with porous polyethylene implants and orthognathic surgery for correction of malar deficiency.

PURPOSE: Patients with skeletal malrelationships caused by maxillary anteroposterior defect and midface hypoplasia may present with an alteration of cheekbone contour. High osteotomies, segmental osteotomies of the zygomatic complex, and malar expansion with alloplastic materials can be performed to improve facial aesthetics. This article describes the restoration of cheekbone-nasal base-lip contour by performing a malaroplasty using an alloplastic implant in addition to orthognathic surgery. PATIENTS AND METHODS: From 1995 to 1996, 17 patients with maxillomandibular malrelationships and deficient cheekbone contour were tested by malar augmentation with porous high-density polyethylene in association with maxillary advancement and mandibular setback. The diagnosis of cheekbone contour alteration was made after observing the patient from a lateral, frontal, and oblique point of view. The position of the implant was determined by using Mladick's point, with lateral or medial extension in relation to the depressed area. RESULTS: By the restoration of normal cheekbone-nasal base-upper lip contour produced excellent aesthetic results in all patients. CONCLUSIONS: Malaroplasty in association with bimaxillary orthognathic surgery seems to be an effective procedure for treating midface skeletal deficiencies.

Biocompatible Materials↗
PubMed1998

Surgical treatment for temporomandibular joint osteoarthrosis. Case report.

TMJ osteoarthrosis and internal derangements are in close connection, representing a substantial portion of temporomandibular disorders. The authors wish to underline the role of surgery in the treatment of this degenerative disease to improve function and to alleviate pain. A 63 year-old woman suffering from closed-lock with reduced opening movements was accepted in our Department in March, 1995. Clinical and radiological evaluations showed bilateral closed lock and severe TMJ osteoarthrosis. Occlusal, pharmacological and physical therapy were performed for one year, without results. Bilateral condylectomy and diskectomy with arthroplasty were carried out. Immediate muscular rehabilitation after surgery was performed by the patient. Follow-up 3, 6, 12 months after surgery were carried out. Full opening movements and reduction of pain were obtained 20 days after surgery. The patient, followed-up one year after surgery, presented effective mandibular movements and adequate amelioration of clinical picture. TMJ surgery in association with physical therapy represents in selected cases an adequate procedure for the treatment of TMJ degenerative disease.

Arthroplasty↗
PubMed1996

The angry pope.

Explore the source record for details and available documents.

Catholicism↗