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Graft Procedure (graft + procedure)
Selected AbstractsEffect of magnitude and direction of force on laryngeal abduction: Implications for the nerve-muscle pedicle graft techniqueEQUINE VETERINARY JOURNAL, Issue 4 2009P. CRAMP Summary Reasons for performing study: The nerve-muscle pedicle graft technique is a treatment for recurrent laryngeal neuropathy (RLN), but the optimal placement of the pedicles within the cricoarytenoideus dorsalis (CAD) muscle is unknown. Hypothesis: The magnitude and direction of force placed on the muscular process of the left arytenoid cartilage affects the magnitude of laryngeal abduction. Methods: Five larynges were harvested from cadavers. Using increments of 0.98 N, a dead-weight force generator applied a force of 0,14.7 N for 1 min each to the left muscular process at 0, 10, 20, 30, 40, 50, 60 and 70° angles. The rima glottis was photographed digitally 1 min after each force had been applied. Distances between biomarkers (Lines 1,4) and right to left angle quotient (RLQ) were used to assess the degree of left arytenoid abduction. Results: Increasing force from 0,14.7 N progressively and significantly increased the length of all lines and RLQ, indicating abduction. Furthermore, there was a significant interaction between force and angles. Applying forces of 7.84 N or greater (Lines 2,4 and RLQ) or 11.76 N or greater (Line 1) at angles 0, 10, 20 and 30° resulted in significantly greater abduction than applying the same forces at 40, 50, 60 and 70°. Angles of 0,30° correspond with the direction of pull exerted by the lateral compartment of the CAD muscle. Conclusion: In RLN, nerve-muscle pedicle grafts should be placed preferentially in the lateral rather than in the medial compartment of the CAD muscle. Potential relevance: The information presented can be used to assist surgeons in the planning and application of the nerve-muscle pedicle graft procedure. [source] Hyperbaric oxygen treatment has different effects on nerve regeneration in acellular nerve and muscle graftsJOURNAL OF THE PERIPHERAL NERVOUS SYSTEM, Issue 2 2001Yasumasa Nishiura Abstract Effects of hyperbaric oxygen treatment (HBO) on nerve regeneration in acellular nerve and muscle grafts were investigated in rats. Nerve and muscle grafts were made acellular by freeze-thawing and the obtained grafts were used to bridge a 10-mm gap in the sciatic nerve on the left and right sides, respectively. Rats were treated with HBO (100% oxygen for 90 minutes at 2.5 atmospheres absolute pressure ATA) twice a day for 7 days. Axonal outgrowth, Schwann cell migration and invasion of macrophages were examined 10 days after the graft procedure by staining neurofilaments, S-100 proteins and the macrophage antibodies ED1 and ED2, respectively. Axonal outgrowth and Schwann cell migration in acellular nerve grafts were superior to that found in the acellular muscle grafts. However, there was no difference between HBO-treated and non-treated rats in acellular nerve grafts. Such a difference was found in acellular muscle grafts concerning both axonal outgrowth and Schwann cell migration from the proximal nerve end. No differences in the content of macrophages or neovascularization (alkaline phosphatase staining) in either of the grafts and treatments were seen. It is concluded that there is a differential effect of HBO-treatment in acellular nerve and muscle grafts and that HBO-treatment has no effect on the regeneration process in acellular nerve grafts, in contrast to fresh cellular nerve grafts where a beneficial effect has previously been reported. [source] Internal Sinus Manipulation (ISM) Procedure: A Technical ReportCLINICAL IMPLANT DENTISTRY AND RELATED RESEARCH, Issue 3 2007Jason M. Yamada DDS ABSTRACT Background, The sinus augmentation procedure has facilitated dental implant treatment in the posterior maxilla where there is insufficient bone for implant placement. A modified Caldwell-Luc, lateral window technique can be applied in most cases needing sinus augmentation in order to create a larger bone volume. However, treatment morbidity can be a concern, especially in the form of postoperative swelling due to surgical trauma. Vertical augmentation using osteotomes has also been selected as a choice of treatment due to less invasive surgery and less postoperative trauma. Although the osteotome technique enables the surgeon to raise the sinus membrane internally through an implant osteotomy site, the quantity and predictability of bone augmentation can be limiting due to the elasticity of the Schneiderian sinus membrane, difficulty of the membrane to separate from the floor as well as the inability to have direct tactile access to "peel" the membrane off of the floor. Purpose, The objective of this report is to present a new, minimally invasive sinus augmentation technique, called the Internal Sinus Manipulation (ISM) procedure, which has been developed to facilitate sinus floor augmentation while reducing treatment morbidity and yet have direct tactile access to raise the membrane off of the sinus floor. Surgical Technique, Access to the Schneiderian sinus membrane is achieved without perforation of the membrane through a conventional osteotomy drilling procedure alone or combined with osteotome technique, followed by reflection of the membrane utilizing special ISM instrumentation and bone graft procedure laterally and vertically through the osteotomy site. A planned implant is then placed. Conclusion, The Internal Sinus Manipulation procedure can be used as an alternative treatment modality for sinus augmentation as compared to the external lateral window technique while reducing postoperative morbidity for the patients who need implant treatment in posterior maxillary areas. [source] Prevalence and management of Schneiderian membrane perforations during sinus-lift proceduresCLINICAL ORAL IMPLANTS RESEARCH, Issue 1 2008Federico Hernández-Alfaro Abstract: This clinical study was undertaken to evaluate the prevalence of surgical complications of the sinus graft procedure and to set a protocol to repair sinus membrane perforations intraoperatively using a variety of techniques and materials. From January 2000 to May 2005, 338 patients were studied, on whom 474 sinus floor augmentation procedures were performed, and a total of 1166 dental implants were simultaneously placed. A total of 104 perforations of the sinus membrane were observed (19 were bilateral). In group number 1, sinus membrane perforations of <5 mm were observed in 56 sinus augmentation procedures (53.85%), 44 were treated using a resorbable collagen membrane and 12 were sutured with a resorbable material. In group number 2, 28 sinus membranes had a perforation size between 5 and 10 mm (26.92%) and were treated using lamellar bone combined with a resorbable membrane. Group number 3 consisted of 20 sinus membrane perforations>10 mm (19.23%), 10 were covered with lamellar bone combined with a buccal fat pad flap, six were treated with a mandibular block graft and four perforations were treated with only a lamellar bone sheet. Two-hundred and seventy-eight implants were placed under repaired membrane perforations and 247 implants survived. Interestingly enough, all the 25 implants that failed to integrate were placed under perforated and reconstructed membranes during the sinus lift procedure. Based on the results of this study, the survival rates of implants placed under reconstructed membranes correlate inversely with the size of the perforations. [source] Palatal Anchorage for the Retention of Interim Removable ProsthesesJOURNAL OF PROSTHODONTICS, Issue 8 2009Alberto J. Ambard DDS Abstract This paper describes a technique that involves the use of palatal implants to retain a maxillary interim prosthesis when extensive bone graft procedures are performed. The rationale is that some bone graft procedures require the removal of the denture flanges for graft success. Once the denture flanges are removed, the denture loses all its retention capabilities, making this lengthy interim phase difficult for the patient. While the use of palatal implants has been documented extensively, limited information is available to describe the use of palatal implants for prosthetic reasons. [source] Outcomes of the overlay graft technique in tympanoplastyANZ JOURNAL OF SURGERY, Issue 9 2010Jennifer E. Ryan Abstract Background:, This audit was undertaken to review the outcomes achieved with the overlay graft technique of tympanic membrane repair in tympanoplasty surgery. Methods:, The charts of all patients who underwent tympanoplasty, in whom an overlay graft technique of temporalis fascia tympanic membrane repair was used, between 1994 and 2007 were reviewed. Information with respect to patient demographics, presence of cholesteatoma or active infection and perforation size was documented. Details of the surgical procedure and clinical outcomes and pre- and post-operative hearing thresholds were recorded in a computer database. Results:, A total of 147 overlay graft procedures were performed in 130 patients. Graft failure with reperforation occurred following five procedures, for an overall success rate of 96.6%. Eighty Type 1 tympanoplasty procedures were performed in which one failure occurred for a 98.75% success rate. Overlay grafting was combined with intact canal wall mastoidectomy (ICW) in 38 cases and with modified radical mastoidectomy (MRM) in 17 cases for a success rate of 93.8 and 95%, respectively. Delayed graft healing as a result of infection, problems such as epithelial pearl, blunting and myringitis occurred in 39 cases (26.5%). Thirty-one cases underwent procedures for ossicular chain reconstruction, 21 of which were 2nd stage procedures. Hearing outcomes were significantly better with Type 1 tympanoplasty compared with ICW or MRM procedures. Conclusion:, This review demonstrates the overlay graft technique of tympanoplasty to be highly successful for tympanic membrane repair, particularly for the more difficult cases such as revision surgery, subtotal perforations and mesotympanic cholesteatoma. [source] Technical Aspects of Laparoscopic Ovarian Autograft in Ewes After Cryopreservation by Slow-Cooling ProtocolREPRODUCTION IN DOMESTIC ANIMALS, Issue 1 2010J Massardier Contents Iatrogenic ovarian failure and infertility are long term-term side effects of anticancerous gonadotoxic treatments in children or women of reproductive year. Ovarian cortex cryopreservation can be a solution to preserve immature germinal cells before gonadotoxic treatment, for later transplantation. The aim of our study was to prove the efficiency of a laparoscopic technique for orthotopic graft after a slow-freezing/thawing protocol, and to evaluate the effect of ovarian cryopreservation and autograft on the primordial follicle survival rate. Experimental surgical study was performed on 6- to 12-month-old ewes. The study was approved by the ethic committee of the Lyon-veterinary-school. The left ovary was removed by laparoscopy and cut in half, and medulla was excised. In group 1 (n = 6), autograft was performed immediately on the right ovary, and in group 2 (n = 6), graft was performed after a slow-freezing/thawing protocol. The second hemi-ovary served as an ungrafted control fragment. A polypropylene/polyglactin mesh was included between graft and base to separate the two structures, to help histological analysis. The mean graft performance time was 71 ± 8 min in the first group and 57 ± 10 min in the second. Freezing did not affect the number of primordial follicles. In the ungraft control fragments, the global anomaly rate (cytoplasm plus nuclear anomaly) increased after freezing (p < 0.05). Others results did not reach signification. Pelvic adhesion occurred only once. The post-graft primordial follicle survival rate was 5.1 ± 2.8% in the non-frozen group vs. 6.3 ± 2.3% after freezing/thawing. Kruskal,Wallis and Wilkoxon non-parametric tests were used for statistical analysis. Laparoscopy seems to be a well-adapted technique for ovarian tissue orthotopic autograft. The main follicle loss occurs before graft revascularization. Our orthotopic graft's procedure has to be improved to obtain a better graft's neovascularization, and to have a better long-term post-graft primordial follicle survival rate. [source] | ||||||||||