finite element study on stress distribution of two different attachment designs under implant supported overdenture

Objective: This study aimed to evaluate stress patterns generated within implantsupported mandibular overdentures retained by two different attachment types: ball and socket and locator attachments

Materials and methods: Commercial CAD/CAM and finite element analysis software packages were utilized to construct two 3D finite element models for the two attachment types. Unilateral masticatory compressive loads of 50, 100, and 150 N were applied vertically to the overdentures, parallel to the longitudinal axes of the implants. Loads were directed toward the central fossa in the molar region of each overdenture, that linear static analysis was carried out to find the generated stresses and deformation on each part of the studied model

Results: According to FEA results the ball attachment neck is highly stressed in comparison to the locator one. On the other hand mucosa and cortical bone received less stresses under ball and socket attachment

Conclusions: Locator and ball and socket attachments induce equivalent stresses on bone surrounding implants. Locator attachment performance was superior to that of the ball and socket attachment in the implants, nylon caps, and overdenture. Locator attachments are highly recommended and can increase the interval between successive maintenance sessions

Incidence, treatment and visual outcomes of non-infectious keratitis as a postoperative complication of laser-assisted in-situ keratomileusis [LASIK]

To study the incidence, treatment, and visual outcomes of Non-Infectious Keratitis as a Postoperative Complication of Laser in-Situ Keratomileusis [LASIK]. The files of 3500 post-LASIK patients [6326 eyes] were reviewed for the development of Non-Infectious Keratitis. Incidence, management regimens, and final best spectacle corrected visual acuity [BSCVA] were reported. Post-LASIK Non-Infectious Keratitis was diagnosed in 149 eyes [2.35%]. The Keratitis was classified as diffuse lamellar keratitis [DLK] in 89 eyes [1.4%] and 60 eyes [0.94%] as localized debris-related Keratitis [LDK]. The occurrence of post-LASIK Non-Infectious Keratitis was 2.35%, with DLK being the common diagnosis overall, with 92.6% of patients achieving < 20/20 BSCVA. The best way for prevention of DLK is to eliminate defined predisposing factors for DLK. Close follow-up during the early postoperative period

Inferior oblique inclusion, incidence early detection and prevention

To evaluate the incidence of inferior oblique inclusion during hooking of the lateral rectus muscle and how to detect and prevent. 50 patients [80] eyes operated upon lateral rectus muscles [recession 55 eyes resection 25 eyes] for correction of horizontal deviation [esotropia and exotropia] the incidence of inferior oblique inclusion during hooking of the lateral rectus muscle throw fornix conjunctival incision was evaluated and managed. the incidence of inferior oblique inclusion was found in 17 eyes 21.25% [12 eyes 15% Partial inclusion and 5 eyes 6.25% total inclusion] the inclusion was detected and managed early. Post operatively no element of vertical deviation due to inferior oblique inclusion inferior oblique inclusion is a preventable complication if taken in consideration during hooking of the lateral rectus muscle