Introduction: RPD for class II takes support from teeth and tissue of edentulous span of different compressibility .Prosthetic management concerns not only restoring the missing spans but also protection of remaining teeth and bone along with a healthy soft tissue. Digital technology and recent polymer material such as Polyether ether ketone (PEEK) and poly ether ketone ketone (PEKK) are used for fabrication of RPD with superior esthetics. The aim of this study: to evaluate the fracture resistance and stress induced by polyether ether ketone (PEEK) versus polyether ketone ketone (PEKK) used in extra coronal attachment of partial denture in Kennedy class II.Materials and methods: Printed 3D lower resin class II model with detachable dies was used to design two splinted crowns with extra coronal attachment virtually. Each of the study groups :group (A) PEEK and group (B) PEKK had 22 milled splinted crowns with extra coronal attachment and partial denture .load was applied bilaterally and stress analysis and fracture resistance were recorded. Data were collected & statistically analysed to compare both groups by independent t-test, the p-value was considered significant at the level of <0.05. Results:The two studied groups showed statistically significant where strain induced was reduced in group (B) in compared to group(A) Conclusion: With in the limitation of this study PEKK material express better distribution of strain & better mechanical properties in compare to PEEK
The purpose of this study was to evaluate the fit and accuracy of conventional lost wax technique and selective laser melting printing technique for fabrication of palatal obturator for acquired palatal defect in treatment of post coronavirus disease associated Mucormycosis (CAM).Twelve patients had two CoCr alloy frameworks constructed with two different manufacturing techniques. The conventional lost wax and selective laser melting printing techniques. The fitting surfaces of both frameworks were scanned. The master cast of the maxillary defect was scanned by desktop scanner. The Standard Tessellation Language file of the master model was inverted, and the fitting surface scan was superimposed with a best-fit alignment using surface matching software to evaluate the adaptation of the frameworks between the superimpositions with the virtual model. The color maps were calculated at rests, clasps and palate.Statistically significant difference between the two studied groups at the palate and defect lines area. While at the rests and clasp areas no significant difference was recorded.The selective laser melting printing technique for fabrication of palatal obturator of acquired palatal defect in treatment of CAM was found to be comparable regarding the fit and accuracy to those fabricated with the conventional lost wax technique. Clinical RelevanceThe accuracy and fit of palatal obturator manufactured by 3D printing technology.
Introduction:In Egypt mucormycosis post COVID-19 recovery affected mainly patients on steroid therapy & uncontrolled diabetes .Maxillary defect after fungal deprinment required a proper prosthetic rehabilitation with properly designed obturator which can be assessed by obturator function scale The aim of this study was to evaluate the quality of life and retention evaluation of two different manufacturing techniques of palatal obturator for acquired palatal defect in treatment of post COVID-19 Associated Mucormycosis (CAM)Materials and methods: For each of twelve patients enrolled in this study, two CoCr alloy frameworks were constructed by two different manufacturing techniques: conventional lost wax tech (group I) and selective laser melting printing technique SLM (group II). Retention was evaluated for both obturators at delivery using digital force gauge. Patient satisfaction was evaluated for both groups after 1 month usage of each obturator with two weeks gap in between by Obturator Functioning Scale (OFS). Data were collected & statistically analyzed to compare both groups by independent t-test, the p-value was considered significant at the level of <0.05. Results:The two studied groups showed statistically insignificant difference in retention but highly statistically significant in OFS where group (II) showed high improvement in obturation function with 100%-75% than group (I) . Conclusion:The (SLM) for fabrication of palatal obturator of acquired palatal defect in treatment of post (CAM) provided a better quality of life than those fabricated with conventional lost wax technique. Retention of obturator fabricated with SLM showed no difference from those fabricated with conventional lost wax technique
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