Purpose of study: Crestal and basal implants are endosseous aids to create osseointegrated points of retention. These two types of implants are not only differentiated by the way they are inserted but also by the way the forces are transmitted. The purpose of this study is to compare the micromotion between two crestal and one basal implant-supported crown, when the mesiodistal space is 14 mm in mandibular 1st molar region. Materials and methods:A three-dimensional finite ele ment method was used to evaluate the micromotion in two osseointegrated crestal implants and one basally osseointe grated implant when the mesiodistal space is 14 mm in mandibular 1st molar region. The loads were applied according to cuspmarginal ridge relation. A total of 333 N and 645 N of load was applied to premolar and each molar respectively. The results were analyzed using Von Mises criteria. Results:The results of the comparison of crestal and basal implant to replace mandibular first molar demonstrated that micromotion in crestal implant (14.545) was less than basal implant (36.031). Conclusion:Thus, within the limitations of this study, it can be concluded that the use of two crestal implants to replace a missing mandibular first molar with mesiodistal edentulous space of 14 mm is a preferable option as compared to basal implant to replace a missing mandibular molar.
Maxillary obturator prosthesis is the most frequent treatment option for management of partial or total maxillectomy. In cases of larger defects, a hollow bulb obturator is used. But what if there is a limited mouth opening is added to it? In such cases the use of an inflatable obturator is advised. This case report presents a method to fabricate the inflatable obturator.
Aim During second wave of COVID pandemic, India faced heavy surge of mucormycosis. Treatment option for these patients included either total or partial maxillectomy with primary closure. Rehabilitation of these patients became challenging because of their age and size of defect. The purpose of the present study is to present a new digital technique for the fabrication of patient-specific zygoma implants (PSI) and to report on its survival and complication rates. Material and Methods Total 21 patients who had undergone either partial or total maxillectomy after mucormycosis and who were disease-free clinically and radiographically for 6 or more months post-resection were rehabilitated using patient-specific zygoma implant. CT scan was obtained for all patients post-maxillectomy for evaluation of existing bone condition. Exocad software was used for virtual surgical planning of zygoma implant considering surgical and prosthetic technicality to achieve goal of maximum functionality and sustainability. Result All the patients were followed up after 15, 30, 45 and 90 days and there after every month for evaluation of soft tissue healing, infection, dehiscence, loosening of prosthesis, eating efficiency and aesthetic. Follow-up period for all 15 patients was in the range of 6–12 months. Conclusion In case of post-mucor maxillectomy patients, use of PSI offers the advantages of minimal bone augmentation, reduction in time required to restore lost function, and reduced financial burden of multiple procedures. Therefore, PSI may represent a valid alternative treatment for the prosthetic restoration of post-mucor maxillectomy patients.
It is appropriate to establish a balance between prosthetic and anatomical concerns when inserting an implant. If a clinician focuses on anatomical concerns, he or she may place the implant at an angle to avoid adjacent teeth or fenestrating the buccal or lingual bone plates. Then, to achieve prosthetically desired parallelism between implants or teeth, the clinician can place an angled abutment. Based on the limited clinical trials reported in the literature, angled abutments result in increased stress on the implants and adjacent bone, but within the physiological limit.Numerous types of prefabricated abutments are available at specific angles. Preangled abutments with angulations varying from 15 to 35° often are commercially available. Furthermore, laboratory technicians can fabricate custom abutments to contours needed for a satisfactory prosthetic reconstruction wherein we have to select proper angulations.
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