To systematically review risks of mechanical impact on peri-implant strain and prosthetic influence on stability across finite element studies.

/pdf/the-prosthetic-influence-and-biomechanics-on-peri-implant-4dej42mufr.pdf

The Prosthetic Influence and Biomechanics on Peri-Implant Strain: a Systematic Literature Review of Finite Element Studies.

/pdf/effect-of-different-types-of-prosthetic-platforms-on-stress-1ag626ewya.pdf

Effect of different types of prosthetic platforms on stress-distribution in dental implant-supported prostheses

Physical disfigurement due to congenital defects, trauma, or cancer causes considerable distress and physical impairment for millions of people worldwide; impacting their economic, psychological and social wellbeing. Since 3000 B.C., prosthetic devices have been used to address these issues by restoring both aesthetics and utility to those with disfigurement. Internationally, academic and industry researchers are constantly developing new materials and manufacturing techniques to provide higher quality and lower cost prostheses to those people who need them. New advanced technologies including 3D imaging, modeling, and printing are revolutionizing the way prostheses are now made. These new approaches are disrupting the traditional and manual art form of prosthetic production which are laborious and costly and are being replaced by more precise and quantitative processes which enable the rapid, low cost production of patient-specific prostheses. In this two part review, we provide a comprehensive report of past, present and emerging soft-tissue prosthetic materials and manufacturing techniques. In this review, part A, we examine, historically, the ideal properts of a polymeric material when applied in soft-tissue prosthetics. We also detail new research approaches to target specific tissues which commonly require aesthetic restoration (e.g. ear, nose and eyes) and discuss both traditional and advanced fabrication methods, from hand-crafted impression based approaches to advanced manufactured prosthetics. We discuss the chemistry and related details of most significant synthetic polymers used in soft-tissue prosthetics in Part B. As advanced manufacturing transitions from research into practice, the five millennia history of prosthetics enters a new age of economic, personalized, advanced soft tissue prosthetics and with this comes significantly improved quality of life for the people affected by tissue loss.

/pdf/advancements-in-soft-tissue-prosthetics-part-a-the-art-of-12e8iuaai3.pdf

Advancements in Soft-Tissue Prosthetics Part A: The Art of Imitating Life

Statement of problem The impact of conventional prosthetic treatment on both the objective and subjective assessments of mastication as well as on well-being is unclear. Purpose The purpose of this clinical study was to compare the impact on oral health-related quality of life and masticatory function in participants treated with conventional dental prostheses. Material and methods A total of 72 patients requiring prosthetic rehabilitation were enrolled by referral from the Faculty of Dentistry at the University of Granada, Spain. At baseline, demographic, behavioral, and clinical (prosthetic status, occlusal units) data were collected. In addition, the scores for quality of life, oral satisfaction, masticatory ability (Leake index), and masticatory performance (after 5, 10, and 15 cycles of bicolored chewing gum) were obtained. These records were obtained again at 6 to 8 weeks after insertion of the prostheses. Results The findings revealed that patients treated with fixed prostheses had better quality of life and better masticatory function than patients treated with removable prostheses. This result was even more pronounced for those treated with complete dentures. For all items, most of the treated patients improved the quality of life (average, 8.6 of the 4 items), although only between 5% and 15% of patients, especially those with a removable prosthesis, commented on functional impact after receiving treatment. Generally, masticatory performance was improved between 7% and 18% and was highly correlated not only with the number of natural teeth (r=0.61) and occlusal units (r=0.51) but also with subjective variables such as mastication satisfaction (r=0.31), impact on quality of life (r=0.30), or masticatory ability (r=0.30). Conclusions Treatment with fixed prostheses achieved better results regarding quality of life, oral satisfaction, and masticatory function than treatment with removable prostheses. A moderate but significant correlation exists between the objective and subjective assessments of the masticatory functions.

Oral health-related quality of life and masticatory function after conventional prosthetic treatment: A cohort follow-up study

The fabrication of finger prosthesis is as much an art as it is science. The ideally constructed prosthesis must duplicate the missing structures so precisely that patients can appear in public without fear of attracting unwanted attraction. A 65-years-old patient reported with loss of his right index finger up to the second phalanx and wanted to get it replaced. An impression of the amputated finger and donor were made. A wax pattern of the prosthesis was fabricated using the donor impression; a trial was performed and flasked. Medical grade silicone was intrinsically stained to match the skin tone, following which it was packed, processed and finished. This clinical report describes a method of attaining retention by selective scoring of the master cast of partially amputated finger to enhance the vacuum effect at par with the proportional distribution of the positive forces on the tissues exerted by the prosthesis.

/pdf/aesthetic-finger-prosthesis-with-silicone-biomaterial-4o6tqphof0.pdf

Aesthetic finger prosthesis with silicone biomaterial.

Prosthetic rehabilitation of extensive maxillectomy defects are exigent given the difficulties faced due to loss of palatal bone,teeth and surrounding supporting tissues which help in retention, support and stability of the prosthesis. An interim maxillary obturator is a prosthesis which is made after surgical resection of a portion or all of one or both maxilla where initial healing is completed. Frequently many or all teeth in the defect area are replaced by this prosthesis. It plays a vital role in preventing the facial disfigurement and irritation to the surgical site thereby enhancing the healing and restores the functional capabilities such as speech, mastication, deglutition etc. To gain better retention and stability, preservation of the unaffected regions is needed which can be achieved by proper surgical planning and designing of the prosthesis. This case series describes rehabilitation of three extensive maxillectomy defects with hollow open and closed interim obturators.

/pdf/rehabilitation-of-post-surgical-maxillectomy-defects-using-5519wiqujy.pdf

Rehabilitation of post surgical maxillectomy defects using interim obturators-a case series.

Purpose: The aim of this study was to evaluate the microstrain exhibited by bone around immediately loaded, platform-switched, and non-platform-switched implants under vertical and angled loading using a finite element analysis (FEA) and also to evaluate whether platform-switched implants evoke a better response than non-platform-switched implants on a mechanical basis. Materials and Methods: Three-dimensional finite element study was undertaken to model and analyze an immediate loaded situation. FEA was chosen for this study since it is useful in determining the stress and strain around the dental implant. Bone responses to vertical and angulated loads on straight and angulated abutments (platform-switched and non-platform-switched abutments) were evaluated. Results: Non-platform-switched abutments tend to exhibit a lower tensile stress and compressive stress but higher microstrain value (conducive to higher chance of bone resorption) than platform-switched abutments. Ideal bone remodeling values of microstrain (50-3000 μϵ) were exhibited by platform-switched straight abutments under vertical load and angled load (with an abutment-implant diameter difference of 1 mm). Conclusion: In spite of the obvious advantages, the practice of immediate loading is limited due to apprehension associated with compromised bone response and a higher rate of bone loss around an immediately loaded implant. The mechanical basis for the concept of platform switching in immediately loaded situation is analyzed in this context. The results of this limited investigation indicated that the ideal values of microstrain (50-3000 microstrain) can be exhibited by platform switching of dental implants (with an abutment-implant diameter difference of 1 mm) and can be considered as a better alternative for prevention of crestal bone loss when compared to non-platform-switched implants.

Comparison of strain generated in bone by "platform-switched" and "non-platform-switched" implants with straight and angulated abutments under vertical and angulated load: a finite element analysis study.

Aim: This study was conducted to evaluate the impact of two different attachment systems on a single implant-retained mandibular overdenture on the oral health-related quality of life of completely edentulous individuals. Materials and Methods: Twelve completely edentulous, first-time denture wearer patients were selected for the study. A set of new conventional complete dentures was fabricated for each patient. Each patient received a single mandibular symphyseal implant which was conventionally loaded with a ball or locator attachment using the cross-over study design. The Oral Health Impact Profile-49 questionnaire and sieve method were used to assess the masticatory performances at various intervals. Results: The paired samples test was used to evaluate the correlation between conventional complete dentures and implant-supported overdentures (ISOD) and the attachments within each group. The independent paired samples test was used to evaluate the correlation between each of the attachments. The results of this study were in favor of the ball attachment at the end of the 2-month period. Conclusion: Within the limitations of this short-term cross-over trial, it may be concluded that single implant-supported mandibular overdentures and a connecting ball attachment are a viable treatment option for the edentulous population with problematic mandibular dentures.

Evaluation of patient satisfaction and masticatory performance between complete dentures and single implant-supported overdentures with locator and ball attachments

Mllerian agenesis is a congenital malformation in women. It is characterized by a failure of the Mllerian ducts to develop, which results in a missing uterus and variable malformations of the vagina. It is also the second most common cause of primary amenorrhea. This clinical report describes the fabrication of prosthesis, by a maxillofacial prosthodontist that is used in the non surgical management of Mllerian agenesis to aid in the dilation of a narrow vaginal opening.

https://print.ispub.com/api/0/ispub-article/9475

Prosthetic Vaginal Dilator- A Case Report

Complete or partial fingers are the most commonly encountered forms of partial hand losses. Though finger amputations are commonly due to traumatic injuries, digit loss may also be attributed to congenital malformations and disease. Irrespective of the etiology, the loss of a finger has a considerable functional and psychological impact on an individual. In order to alleviate these problems, partial or complete finger prosthesis may be fabricated. This clinical report portrays a method to fabricate silicone rubber prosthesis for a patient who has a partial finger loss caused due to trauma.

Aesthetic Finger Prosthesis

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