Abstract
ABSTRACT Objective The aim of this study was to evaluate the in situ hardness, compressive strength and resilience of soft lining materials used in total removable prostheses in different time intervals Methods total of 48 rectangular test specimens (10 x 3 x 2 mm) were fabricated of each of the polyvinylsiloxane-based soft liner (Mucopren Soft) and acrylic resin-based material (Trusoft), which were placed on total removable prostheses bases of 12 volunteers (n = 12). The hardness (Shore A), compressive strength (in MPa) and resilience (in Kgf/cm2) were evaluated in different time intervals: 0, 7, 30 and 60 days, at three different locations of the specimens surface. Results The two-way ANOVA and Tukey test showed that the polyvinylsiloxane-based soft liner presented higher hardness values (p = 0.0113) and higher compressive strength (p=0.0252) than the acrylic resin-based material at immediate and 7 days evaluations. The polyvinylsiloxane-based soft liner presented higher resilience values than the acrylic resin-based material at all times (p = 0.0133). Hardness and compressive strength were similar for both materials at 30 and 60 days evaluations. Conclusions For both materials,there was a tendency for an increase of hardness, compressive strength and resilience over time, influenced by the composition of the tissue conditioner. The polyvinylsiloxane-based soft liner presented higher hardness, compressive strength and resilience than the acrylic resin-based material, specially considering a long-term evaluation up to 60 days.
Highlights
The use of resilient lining materials in complete dental prostheses is indicated in immediate complete dental prostheses, with the purpose of improving problems of diction related to cleft palate and immediate ferrulization after surgeries [1,2,3,4,5,6] and to stabilize complete dental prostheses used as healing guides, avoiding the recurrence of hyperplasias caused by poorly fitting dentures removed by surgical procedures [5,7,8]
Resilient reliners are more advantageous in comparison with acrylic resin-based materials, because they form a soft layer between the rigid base of the complete dental prosthesis and the oral mucosa, with the potential to improve the comfort of complete denture wearers [5,6,9,10]
For the maxillary dental prosthesis, niches were created to accommodate the specimens of both lining materials
Summary
The use of resilient lining materials in complete dental prostheses is indicated in immediate complete dental prostheses, with the purpose of improving problems of diction related to cleft palate and immediate ferrulization after surgeries [1,2,3,4,5,6] and to stabilize complete dental prostheses used as healing guides, avoiding the recurrence of hyperplasias caused by poorly fitting dentures removed by surgical procedures [5,7,8]. Resilient reliners are more advantageous in comparison with acrylic resin-based materials, because they form a soft layer between the rigid base of the complete dental prosthesis and the oral mucosa, with the potential to improve the comfort of complete denture wearers [5,6,9,10]. The complete denture lining materials are presented in a rigid or resilient form and may be polyvinylsiloxane- or acrylic resin-based products [1,6,12]. The polyvinylsiloxanebased materials have advantages compared with those of acrylic resin, such as maintaining their resilience for periods longer than six months [5,13] in addition to improving the performance in thin and irregular areas of the mucosa [5,6,9,11]. Their main disadvantage is lack of adhesion to the conventional acrylic resin base of the dental prosthesis [14,15,16]
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