The Effect of Flexible Acrylic Resin Lingual Flanges on The Retention of Mandibular Complete Dentures

Abstract

To evaluate the effect of flexible lingual flanges on the retention of conventional mandibular complete denture. Material and methods: Ten completely edentulous patients were selected for this study with ages ranged from 50-60 years. All patients had received heat cured acrylic resin denture without modification (Group І) then heat cure lingual flanges were removed and replaced by flexible lingual flanges (Group ІІ). All patients were instructed to use their resin dentures for equal periods of three months when retention of denture base were measured after one month and at the end of three months, period of two week interval was left between each group as a washing period. results: The results of this study showed that there was a significant difference between them, as the flexible lingual flanges (group ІІ) was better than the heat cured acrylic resin denture base (group І). Conclusion: Within the limitation of this study, it was concluded that retention of the mandibular denture modified with flexible acrylic resin "versacryl" was higher than that of the conventional heat cured acrylic resin denture. Retention was increased by time in each study group. The use of flexible acrylic resin in mandibular complete dentures (as lingual flange) could be considered as an alternative effective treatment. IntroduCtIonPolymethylmethacrylate (PMMA) resin has been successfully used for various applications in dentistry for many years. It has many advantages, particularly its appearance and ease of manipulation, but it still has certain poor mechanical properties. Fractures may occur during use due to unsatisfactory impact and transverse strength. Dimensional stability is of considerable importance as a clinical problem as well. Therefore, in the clinical practice of dentistry, there are many circumstances in which the need to adjust denture base acrylic resin is necessary (1) .

Retention And Functionality Assessment for Two Design of Interim Maxillary Obturator

“…Flexible acrylic resin flange may enhance the chance for extension of denture base deeper to engage more soft-tissue undercut which, in turn, increase the retention of maxillary denture. (4,14) While hard acrylic resin denture base is used for construction of the interim denture of the study, but the flexibility of the denture flange is not due to the flexibility of the denture base itself but from the flexibility of the connection (by wrought wire) between the body of…”

“…(3) Also, the using of reverse and flex acrylic resin is useful to solve the problem of insertion and removal of prostheses and also to exploit the soft tissue undercut rather than blocking. (4) In this study, a buccal flange is attached to the main base of the obturator by wrought wire and utilizes the bony and dental buccal undercut for the intact side. The design is proposed to enhance the retention, reduce mouth preparation and facilitate the manipulation of the interim prostheses comparing to the conventional design with multiple wrought wire clasps.…”