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At least 523 records · Page 29Linked to original sources
PubMed1999

Reconstruction plates to bridge mandibular defects: a clinical and experimental investigation in biomechanical aspects.

A retrospective study of 68 patients was carried out to assess the complications arising from the use of reconstruction plates in the maintainance of space and contour following mandibular segmental resection. Skin or mucosal perforation, plate fracture and loss of screw retention were the main complications. The most susceptible sites to screw loosening in the plates were situated nearest to and farthest from the resection margin on the proximal residual segments. Some of the possible causative biomechanical mechanisms of plate failure were studied using photoelastic models simulating the types of mandibular defect and plate fixation. Isochromatic fringe analysis was used to analyse stress lines in the bone surrounding screws. It was found that, during functional loading, moment and shear forces produced high concentrations of squeeze and press stress in this bone, causing bone resorption with consequent loss of screw retention.

Birefringence↗
PubMed1975

[Methodological characteristics of restorative surgery and orthodontic treatment in the correction of extensive defects of the tissues in the oral region and the anterior portion of the mandible].

In the paper, technical and tactical features while using reconstructive surgery and orthopedic therapy for liquidation of vast tissue defects in the adoral region and anterior mandibular portion are discussed. The importance of planning plastic operative procedures with optimum utilization of local tissues, especially in labioplasty, is substantiated, and some definite recommendations on using the pedicled graft tissue are given. A sequence of stages in replacement of soft tissues is described, as well as some features of elimination of the anterior mandibular defect by the iliac bone graft. It is for the first time that the importance of joint efforts of surgical and orthopedic specialists for providing a large scale complex therapy is emphasized, that may contribute to favourable anatomical, cosmetic and functional results in liquidation of vast tissue defects of the adoral region and anterior mandible.

Adult↗
PubMed2001

[The experimental study of Sr-HAP on reconstructing mandibular bone defect].

OBJECTIVE: Different ration of Sr-HAP was implanted in animals to study the bioreactions in order to prepare for the clinical applications in future. METHODS: 24 rabbits were divided into 3 groups for study. Bone defect of 6 mm x 12 mm x 4 mm was made at the mandibular angle of rabbits and Sr-HAP of different proportion (10%, 5%, 0%) was applied to reform the defect. One group of animals were killed at 1 month, 3 months, 6 months to evaluate the biologic capacity with anatomy, histology, SEM, tetracycline fluorescent marker, ECT and ration histology. RESULTS: Sr-HAP had hardly been rejected by hosts, and in early period after operation the new bone in the Sr-HAP was found with great quantities as the degradation of Sr-HAP much more than that in the pure HA, and the difference of bone quantity can be shown in statistics. CONCLUSIONS: 1. Sr-HAP has a better biocompatibility, biodegradation than pure HA and a excellent osteoinductivity. The existence of Sr-HAP improves the total new bone quantity and the interface of bone, also prolongs the period of new bone increasing. 2. Sr-HAP has a good biodegradation and suitable speed of biodegradating, so the reconstruction effect with Sr-HAP is fairly satisfactory.

Animals↗
PubMed1999

[Long-term complications associated with immediate plate reconstruction for mandibular defect following tumor-surgery].

OBJECTIVE: To assess the long-term complications associated with the application of reconstruction plate. METHODS: Ninety-seven patients underwent immediate repair by using bendable reconstruction plate for maintainance of space and contour following mandibular segmental resection. Of them, 68 cases were followed up for the final outcomes. RESULTS: Skin or mucosa perforation occurred 6 cases, instabilization of screws in 22 cases, and broken of plate in 3 cases. The reasons for skin or mucosa perforation was possibly associated with circulatory disturbance due to postoperative irradiation. The bone absorption and screw loosening occured most frequently in bone defect involving mandibular angle and chin. CONCLUSION: High concentration of unrationable stress and irradiation were recognised to be the factors responsible for the perforation of covering tissue and screw loosening. The broken of plate was brought about possibly by stress loading and fatigue weakness of plates.

Bone Plates↗
PubMed2001

[Primary reconstruction of lateral oro-mandibular defects using titanium plates (Thorp) and revascularized non-osseous flaps: a personal experience].

Reconstruction of a particular defect is an highly complex problem, that is reflected in the number and variety of techniques proposed. This is particularly true for reconstruction of mandibular segment defects usually together with the need to repair oro-pharnygeal soft tissues defects of various size. The high rate of successes that can be obtained today using microvascular reconstruction techniques explains the reason why bone free flaps have progressively become the "gold standard" used as benchmark for all other forms of primary mandibular reconstruction. However, for selected patients (elderly patients or individuals in poor general health; the presence of lateral oro-mandibular defects or soft tissue defects significantly exceeding the bone defect) the association of non-osseous microvascular free flaps (such as forearm skin flaps or miocutaneous free flaps of the abdominal rectus muscle) with a titanium mandibular reconstruction plate (THORP) can prove a valid alternative. Indeed, in these cases reconstruction of choice would be the association of two free flaps, one osseous and the other non osseous. The use of THORP-type mandibular reconstruction plates in repairing lateral defects increases the overall risk of complications related to the reconstruction technique which is already hindered by the risks associated with the use of microvascular free flaps. The present work starts with a retrospective evaluation of 5 years series of primary mandibular reconstruction for lateral oro-mandibular defects following oncological surgery. The role of THORP-type titanium mandibular plates, used in combination with non-osseous free flaps in the treatment of selected patients, is then described and discussed.

Aged↗