1Senior Resident, Department of Prosthodontics, Bhojia Dental College and Hospital, Baddi, Himachal Pradesh, India
2Professor and Head, Department of Prosthodontics, Bhojia Dental College and Hospital, Baddi, Himachal Pradesh, India
3Professor, Department of Prosthodontics, Bhojia Dental College and Hospital, Baddi, Himachal Pradesh, India
*Corresponding Author: Manjit Kumar, Professor, Department of Prosthodontics, Bhojia Dental College and Hospital, Baddi, Himachal Pradesh, India, Email: manjitkiran@yahoo.co.in
Online published on 19 August, 2025.
This study was undertaken to evaluate and compare the effect of different surface treatments on bond strength between commercially available soft liners and denture base resin.
Suitable specimens were prepared using the metal die. A total of 80 pairs of PMMA cylinders were prepared. The 80 pairs of PMMA cylinders were divided into 2 groups of 40 each namely Group A and B. Group A denoted GC Reline Soft liner and group B denoted Mollosil. Each group was divided into 4 sub-groups of 10 each, namely I, II, III and IV. The four sub-groups underwent 4 different types of surface treatments (control, methyl methacrylate, acetone and sandblasting). The cylinders of group A and group B were lined by GC Soft liner and Mollosil respectively. All the Specimens were subjected to tensile bond test. Testing was carried out in Universal Testing Machine at a crosshead speed of 5 mm/ min. All the specimens were placed under tension until failure in the specimen occurred.
The tensile bond strength of subgroup II, III and IV of both the groups (Group A- 0.4920; Group B- .3670) was higher than their respective control sub-groups. Overall tensile bond strength of group A (GC-Reline) was higher than Group B (Mollosil). The tensile bond strength of Group A was maximum in subgroup II (0.49) and the tensile bond strength of Group B was maximum in subgroup III (0.38).
Acrylate based soft liners have a higher bond strength than silicone-based materials. This is due to the similar chemical compositions of the denture base material and the soft liner. It is evident that increase in tensile bond strength has been observed due to surface treatment of PMMA denture base resin with sandblasting, monomer and acetone. The tensile bond strength of GC Reline was maximum when acrylic resin was treated by monomer and the tensile bond strength of Mollosil was maximum when the acrylic resin was treated with acetone. So, according to the study, acrylic resin bonded to GC Reline soft liner when treated by sandblasting provides the best tensile strength and is recommended for clinical use.
Denture liners, Surface treatment, GC Reline, Mollosil, Tensile bond strength
