This paper focuses on a unique form of polyester matrix composite with woven roving fibers as reinforcing agent, replacing the conventional E-glass. The impact of different types of orthophthalic unsaturated polyester matrix and their composites on tensile strength of polyester matrix composite with woven roving fiber is investigated. Polyester matrix composite with woven roving fiber reinforcement is made by hand lay-up technique, where different types of orthophthalic unsaturated polyester matrices available in the market are used. The mechanical properties of the developed material are tested using universal testing machine, which investigated tensile strength. The BYK A-555 (coded 555) orthophthalic unsaturated polyester matrix showed 30% greater tensile strength and required least curing time as compared to other matrices, including Mc Laren S3133 (coded 3133), LUPOY-GP5300 (coded GP5300) and HSEA-LF1 (coded LF1). However, the composite of 3133 and 555 shows 50% greater tensile strength as compared to single matrix, and when all orthophthalic unsaturated polyester resins (3133 + 555 + GP5300 + LF1) are mixed together, their composite show 70% greater tensile as compared to single unsaturated polyester matrix.
Purpose: To find out the efficacy and structural stability of autologous serum for the fixation of limbal conjunctival Autograft in the management of pterygium surgery. Study Design: Quasi-experimental study. Place and Duration of Study: Orbit and Oculoplastic department of LRBT Hospital, Karachi, from June 2020 to November 2020. Methods: This study included 100 eyes of 100 patients with primary pterygium.Eyes with nasal Pterygium of grade III were included. Patients with ocular surface disorders, infection, inflammation, pseudo pterygium, pterygium at temporal side and coagulation disorders were excluded. After pterygium excision, a free limbal conjunctival Autograft was taken from superotemporal quadrant of bulbar conjunctiva of same eye and was used to cover the bare sclera with autologous serum. Subconjunctival injection of antibiotic and steroid was given followed by 24 hour of eye pad. Postoperative outcomes of the graft were noted at theend of the six months period of follow up. Results: The mean age of the patients was 46.5 ± 8.97 years (range 20 – 60 years). Male to female ratio was 3:1 (75 males and 25 females). Graft loss was found in five patients, graft edema in one patient, graft retraction in three patients, graft overriding in two patients, recurrence of pterygium in six patients, granuloma in two patients and subconjunctival hemorrhage in 10 patients. Conclusion: Autologous serum for fixation of limbal conjunctival Autograft is a safe, efficient and cost-effective method of treatment for primary pterygium surgery.
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