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Objectives The aim of the current study was to evaluate potential differences in the accuracy of mandibular reconstruction and long-term stability, with respect to different reconstructive procedures. Methods In total, 42 patients who had undergone primary segmental mandibular resection with immediate alloplastic reconstruction, with either manually pre-bent or patient-specific mandibular reconstruction plates (PSMRP), were included in this study. Mandibular dimensions, in terms of six clinically relevant distances (capitulum [most lateral points], capitulum [most medial points], incisura [most caudal points], mandibular foramina, coronoid process [most cranial points], dorsal tip of the mandible closest to the gonion point) determined from tomographic images, were compared prior to, and after surgery. Results Dimensional alterations were significantly more often found when conventionally bent titanium reconstruction plates were used. These occurred in the area of the coronoid process ( p = 0.014). Plate fractures were significantly ( p = 0.022) more often found within the manually pre-bent group than within the PSMRP group (17%/0%). Conclusion The results suggest that the use of PSMRP may prevent rotation of the proximal mandibular segment, thus avoiding functional impairment. In addition, the use of PSMRP may potentially enhance the long-term stability of alloplastic reconstructions.

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Introduction Cemento-ossifying fibroma is considered as a benign osseous tumour, closely related to other lesions such as fibrous dysplasia and cementifying periapical dysplasia. These lesions occur in the second to the fourth decade of life. It is a bony tumour of maxilla and mandible of possibly odontogenic origin with aggressive behaviour and high tendency for recurrence. Radiologically, the lesion appearances varied ranging from radiolucent cystlike appearance to mixed and/or radiopaque areas. Aims and objectives The article attempts to highlight the importance of clinical, imaging aspects and histopathology in diagnosis of cemento-ossifying fibroma along with management and long-term follow-up. Materials and methods This retrospective study was done on histologically diagnosed 16 fibro-osseous lesions. These patients were treated under general anaesthesia at our institute. The demographic data, radiographic features, and histopathologic findings were analysed and compared. The treatment and follow-up data were also recorded. Results Cemento-ossifying fibroma showed higher predilection for female than for male patients and with an equal number of cases reported in maxilla and mandible with no signs of recurrence in long-term follow-up of 15 years. Conclusion Complete surgical excision of cemento-ossifying fibroma comes out to be only effective treatment that gave satisfactory results and can be considered as a definitive treatment modality.

In this paper, we present a solution to the problem of non-fragile robust optimal guaranteed cost control for a class of uncertain two-dimensional(2-D) discrete systems described by the general model (GM) subject to both state and input delays. The parameter uncertainties are assumed norm-bounded. A linear matrix inequality (LMI)-based sufficient condition for the existence of non-fragile robust guaranteed cost controller is established. Furthermore, a convex optimization problem with LMI constraints is proposed to select a non-fragile robust optimal guaranteed cost controller stabilizing the uncertain 2-D discrete system with both state and input delays as well as achieving the least guaranteed cost for the resulting closed-loop system. The effectiveness of the proposed method is demonstrated with an illustrative example.