This paper reports the development of a computer aided system for micro-ECM process to design tools to produce accurate internal features on workpiece. Mathematical model has been developed to compute the inter-electrode gap (IEG) for chosen shape of tool and process conditions. Axi-symmetric tools of different profiles such as cylindrical, conical, hemispherical have been analysed to predict the shapes of work cavities. Model is validated with the reported results and some experiments conducted by us on typical tool shapes. Parametric studies have been carried out to study influence of various process variables on the accuracy of cavity shapes. Based on these studies, guidelines for improving profile accuracy in micro-ECM have been suggested.
Background: Aim of the study was to evaluate the modified fan flaps done during the past two years with regard to applicability, reliability, functional perspective and complications.Methods: All the cases of lower lip defects which were reconstructed using modified Mc Gregor’s fan flaps were included and followed up prospectively at periodic intervals up to 2 years. The indications, applicability to defect size, postoperative aesthetic and functional results and drawbacks were noted.Results: Total 21 modified fan flaps were done during this period. All were done for squamous cell carcinoma affecting lower lip. All the flaps survived, four patients had marginal mucosal loss of neovermilion which healed by secondary intention, 1 case of Bilateral modified Gilles fan flap developed little microstomia, 1 flap with bilateral fan flap had dehiscence of suture line leading to significant morbidity which later had to be closed by secondary resuturing.Conclusions: The modified Mc-Gregors fan flaps are safe and reliable flap for lower lip reconstruction in terms of acceptability and function.
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