Maxilla augmentation with calvarial bone

Mensen zonder tanden is de bovenkaak kunnen vaak niet goed functioneren met een kunstgebit. In de onderkaak wordt dit fenomeen vaak behandeld met een zogenaamd "klikgebit". Een kunstgebit op implantaten. In de bovenkaak is dit vaak niet mogelijk door een tekort aan bot waarin de implantaten verankerd zouden moeten worden. Voorheen werd dit probleem opgelost door de bovenkaak op te bouwen met bot uit de bekkenkam. Aan deze ingreep zitten wat nadelen. Het is een pijnlijke ingreep en implantaten kunnen vaak pas in tweede instantie geplaatst worden. In dit proefschrift wordt een methode beschreven om de bovenkaak op te bouwen met schedelbot. Er blijkt op deze manier sprake van minder pijn en de mogelijkheid om in een ingreep de bovenkaak op te bouwen en meteen te implanteren

The effects of rhetorical patterns or schemata on reading comprehension in expository text of Persian

AbstractThis study attempts to explore the schemata or rhetorical patterns on reading comprehension of 300 state run university students of psychology and educational fields. The subjects involved were selected through stratified random sampling. This group includes two ways factorial design through random assignment. The variables of this article were investigated in three groups (100 subjects in each group). Each group was asked to recall the text and finish a multiple-choice test. The central instrument included three versions of passage with identical content but different schemata: descriptive (listing) pattern, explaining pattern and analysis pattern. Analysis of recall test indicated that subjects displayed better recall of the text with highly structured schema than the one with loosely controlled schema. The outcomes suggested that rhetorical patterns have a significant effect on written communication

Calvarial bone grafts to augment the alveolar process in partially dentate patients:a prospective case series

BACKGROUND: Calvarial bone grafts as a pre-implant augmentation procedure are mostly used to reconstruct the edentulous maxilla, although calvarial grafts could also be used in the partially dentate patients needing extensive bone grafting.METHODS: In 7 consecutive partially dentate patients needing bone grafting because of a large bony defect as a result of trauma (n = 1), oligodontia (n = 1), failed previous bone augmentation (n = 1), or atrophy (n = 4), the alveolar process was reconstructed with calvarial bone as a pre-implant procedure.RESULTS: A total of 30 implants was placed either immediate at the time of bone grafting (13 implants) or after a healing time of 4 months when immediate placement was not possible (17 implants). One wound dehiscence occurred that needed secondary intervention. During follow-up (40 ± 14 months), one implant was lost due to peri-implantitis with an infected osteosynthesis screw. Marginal peri-implant bone loss was 0.65 ± 0.47 mm during this period.CONCLUSION: Calvarial bone is a sound extra-oral donor site when aiming for reconstruction of a large bony defect of the alveolar process of partially dentate patients.</p

Safe Harvesting of Outer Table Parietal Bone Grafts Using an Oscillating Saw and a Bone Scraper:A Refinement of Technique for Harvesting Cortical and "Cancellous"-Like Calvarial Bone

Calvarial bone is a readily available source of bone for preimplantation augmentation procedures of the alveolar process. However, the calvaria consist mostly of cortical bone, and cancellous bone of the diploic space is scarce. A bone scraper (Safescraper Twist; META, Reggio Emilia, Italy) was used to create a beveled trough around the calvarial outer table graft to facilitate its removal with an oscillating saw. Using the scraper, copious amounts (>10 mL) of "cancellous"-like bone could be collected. This new application of the Safescraper Twist obviated milling down additional cortical pieces. (C) 2012 American Association of Oral and Maxillofacial Surgeons J Oral Maxillofac Surg 70:963-965, 201

Immediate dental implant placement in calvarial bone grafts to rehabilitate the severely resorbed edentulous maxilla:A prospective pilot study

Purpose: The aim of this study was to describe the surgical technique of immediate dental implant placement in calvarial grafts for augmentation of the severely resorbed maxilla and to assess the treatment results. Methods: In 13 patients the maxilla was augmented with calvarial bone followed by simultaneous dental implant placement (total: 68 implants). In the frontal "knife edge" region, implants were inserted in the buccal plated area. In the maxillary sinus area, implants were inserted into alveolar bone that was plated buccally or palatally through the sinus window. After 4 months, the implants were retrieved and subsequently loaded. Per-operative and post-operative variables were scored. One bone biopsy sample was taken for histological analysis. Results: The surgical procedure and wound healing was uneventful. During abutment connection after 4 months, all implants were fully osseointegrated with no signs of graft resorption. Radiographically, the mean (+/- SD) peri-implant bone loss after 1 year of functional loading was 0.23 +/- 0.44 mm. No implants were lost. Histological examination revealed vital calvarial and maxillary bone with active remodeling. Conclusion: Immediate dental implant placement in calvarial bone grafts to rehabilitate severely resorbed maxilla is technically feasible and seems to have a high success rate. (C) 2018 European Association for Cranio-Maxillo-Facial Surgery. Published by Elsevier Ltd. All rights reserved

Donor site morbidity of anterior iliac crest and calvarium bone grafts: A comparative case-control study

Purpose: Notwithstanding its donor site morbidity, autogenous bone graft harvesting is still considered the gold standard for cases of extreme resorption of the alveolar ridge. The aim of this study was to assess donor site morbidity of calvarium and anterior iliac crest harvesting. Material and methods: A total of 27 edentulous patients who had undergone calvarial bone harvesting were matched with 27 edentulous patients in which anterior iliac crest bone was harvested. All patients had been treated between March 2011 and December 2013. Patients were matched according to age, sex, and duration of follow-up. Donor site morbidity was assessed by medical records, patient questionnaires, and physical examination. Patients were recalled to assess persisting morbidity of the harvesting procedure. Results: Exposure of the dura occurred in three patients in the calvarial group. Postoperative pain (based on a visual analog scale) after harvesting was significantly higher in the anterior iliac crest group. Scars were significantly longer and contours deficits were significantly more prominent after calvarial harvesting, although not bothersome to the patients. Long-term pain was negligible in both groups, and satisfaction with the procedure did not differ. Conclusion: Both harvesting techniques were accompanied by low long-term donor site morbidity and high patient satisfaction. (C) 2016 Published by Elsevier Ltd on behalf of European Association for Cranio-Maxillo-Facial Surgery