[Fabrication of a sectional impression tray and a collapsible removable complete denture in a microstomia patient: a clinical report]

An abnormally small oral orifice is defined as microstomia which is caused by various factors like burning, scleroderma, etc. This disorder is difficult to treat due to the reduced oral opening. In particular, fabrication of removable prostheses is further complicated by tongue rigidity and the constant adjustment required to accommodate the changing periphery; however, successful treatment is possible through specific measures

In this article, a 41-year-old woman living in Baghmalek, Khoozestan was referred to the Prosthodontic department of Jondishapoor University in Ahvaz, southern Iran. She was suffering from microstomia and poor manual ability caused by scleroderma. Initial impression was prepared for her, using Silicon impression material by applying fingers pressure. The final impression was prepared using a two section tray so that the larger part covered one third of the smaller one and both could be attached by compressable button. Then the occlusal relation was established using occlusal rims connected to the two section parcels. Two part parcel prostheses connected with attachments were made for the lower and upper jaws, respectively. The patient was followed up for six months

Conclusion: In order to overcome the above-mentioned problems, the new method of removable prosthesis enjoys the advantage of sufficient precision as well as ease of use by the patient. For further evaluation, diagnosis and proper treatment plan are reported

[Fabrication of implant-supported ear prosthesis: report of a case]

Restoration of facial lesions has been always difficult for prosthodontists. Extraoral facial prosthesis are faced with apparent limitations such as base removable tissue, lack of large-sized prosthesis and intolerance by the patients. The use of implants may lead to a decrease in these limitations. The implant-induced retention can replace the largesized prosthesis in removable tissue bases and then, the attention may be focused on prosthesis esthetics only. The present study reports a case of implant - supported ear prosthesis with trauma history referring to Removable Prosthodontics Department of Dental School, Shaheed Beheshti University of Medical Sciences

[Effect of different sprue designs on the internal porosity of cast titanium crowns]

Porosity is a frequently observed casting defect in titanium dental casting. This study measured the effects of different sprue design on the internal porosity of cast titanium crowns. Sixty complete veneer crowns were fabricated on a stainless steel die with a 150- degree sloping shoulder using customized wax patterns. All wax patterns were sprued with 3 different sprue design [Reservoir, Runner bar and Rousseau] and were invested with an alumina- magnesia investment. Castings were made with commercially pure titanium [CP Ti [grade II]] according to the manufacturer's instructions. The castings were carefully cleaned. Internal porosities were quantified with photographs and radiographs by computerized image analyses. Data were analyzed with an ANOVA with a confidence level of 95%. There were statistically significant differences in the values of porosity between 3 types of sprue design. The reservoir sprue design had the least internal porosity comparing to the other designs. Improvements in the porosity of titanium crowns was the result of the Reservoir sprue design with vent. Effects of Different sprue designs on internal porosity and their effects on casting accuracy and marginal adaptation of cast titanium crown and bridges must be evaluated to achieve better evidence and clinical relevance