Background: Finger amputation may result from congenital cause, trauma, infection and tumours. The finger amputation may be rehabilitated with dental implant-retained finger prosthesis. The success of implant-retained finger prosthesis is determined by the implant loading. The type of the force is a determining factor in implant loading.Objective: To evaluate stress distributions in finger bone when the loading force is applied along the long axis of the implant using finite element analysis. Method:The finite element models were created. The finger bone model containing cortical bone and cancellous bone was constructed by using radiograph. Astra Tech Osseo Speed bone level implant of 4.5 mm diameter and 14 mm length was selected.The force was applied to the top of the abutment along the long axis of the implant.Results: Finite element analysis indicated that the maximum stress was located at the head of abutment screw. The minimum stress was located in the apical third of the implant fixture. The weakest point was calculated by safety factor which is located in the spongy bone at apical third of the fixtures. Finally, 4.9 times yield stress of spongy bone was needed for the deformation of the spongy bone. Conclusion:Finite element study showed that when the force was applied along the long axis of the implant, the maximum stress was located around the neck of the implant and the cortex bone received more stress than cancellous bone. So, to achieve long term success, the designers of implant systems must confront biomaterial and biomechanical problems including in vivo forces on implants, load transmission to the interface and interfacial tissue response. InTROduCTIOnFingers have an important role in the function and aesthetics. Finger amputation may result from congenital cause, trauma, infection and tumours. The loss of a finger leads to functional and psychological problems. The finger amputation may be rehabilitated with dental implant-retained finger prosthesis. The biomechanical behavior of implant-retained finger prosthesis systems including the reliability and the stability of the implant-abutment and implant bone interface plays an important role in its functional longevity inside the boneThe structure of dental implant is directly connected with a bone that would cause the non-uniform stress pattern of bone and might induce biomechanical overloading failures in implant and bone [2]. The success of implant-retained finger prosthesis is determined by the implant loading, consequently, which leads to the bone loss around the implant. The characteristic of the force is a determining factor in implant loading. This overloading would cause the microdamage accumulation at bone and results in bone loss around the neck of the implant [3]. Furthermore, it is reported that the initiated loss of bone mostly around implant neck evolves deeper into the bone [4,5]. Finite element analyses (FEA) of stressand strain fields have indicated that stress concentration occurring exclusively in the cortical bone near...

Obstructive sleep apnea (OSA) is a condition which occurs from the narrowing of the upper airway. Obstructive sleep apnea in the edentulous patient can be caused by the anatomical obs truc tion of oropharyngeal space. In the elderly patients, the muscles of soft palate can easily be collapsed which can result in obstruction in respiratory passage. Oral appliance, namely, mandibular advancement device (MAD) is the recommended treatment appliance for the patient with mild to moderate OSA. In the elderly edentulous patients, OSA is worsening as these patients are difficult to treat with oral appliance due to with diminished vertical dimension and lack of retention for MAD. The use of osseointegrated dental implants and the locator attachments aid in the retention of the appliance provides support to the denture and the device, and also prevent trauma to the underlying mucosa. This case reports the technique of fabrication of MAD with elastic mandibular advancement (EMA) device to treat moderate OSA from implant retained complete dentures in maxilla and mandible in complete edentulous patient.

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The study was done to see the incidence of the finger defect and to develop a nomenclature system with the help of ques tionnaire, clinical examination, and radiographs of the finger defects obtained in two standard planes.The results of this study demonstrate that finger injuries were common males than females and the defect was more common in the right hand and in middle fingers. Amputation was more common at the level of distal phalanges.