BOND STRENGTH OF ACRYLIC SOFT LINER
TO ND:YAG LASER-TREATED
THERMOPLASTIC ACRYLIC DENTURE BASE
MATERIAL
Alkasim A. Alabady
Prosthodontics department / College of Dentistry / University of Baghdad / Iraq
dr.alkasimalabady@gmail.com
Bayan S. Khalaf
Prosthodontics department / College of Dentistry / University of Baghdad / Iraq
bayan.s.khalaf@codental.uobaghdad.edu.iq
Reception: 24/11/2022 Acceptance: 17/01/2023 Publication: 06/02/2023
Suggested citation:
A. A., Alkasim and S. K., Bayan (2023). Bond Strength Of Acrylic Soft Liner To
Nd:Yag Laser-Treated Thermoplastic Acrylic Denture Base Material. 3C
Tecnología. Glosas de innovación aplicada a la pyme, 12(1), 354-364. https://
doi.org/10.17993/3ctecno.2023.v12n1e43.354-364
https://doi.org/10.17993/3ctecno.2023.v12n1e43.354-364
3C Tecnología. Glosas de innovación aplicadas a la pyme. ISSN: 2254-4143
Ed.43 | Iss.12 | N.1 January - March 2023
354
BOND STRENGTH OF ACRYLIC SOFT LINER
TO ND:YAG LASER-TREATED
THERMOPLASTIC ACRYLIC DENTURE BASE
MATERIAL
Alkasim A. Alabady
Prosthodontics department / College of Dentistry / University of Baghdad / Iraq
dr.alkasimalabady@gmail.com
Bayan S. Khalaf
Prosthodontics department / College of Dentistry / University of Baghdad / Iraq
bayan.s.khalaf@codental.uobaghdad.edu.iq
Reception: 24/11/2022 Acceptance: 17/01/2023 Publication: 06/02/2023
Suggested citation:
A. A., Alkasim and S. K., Bayan (2023). Bond Strength Of Acrylic Soft Liner To
Nd:Yag Laser-Treated Thermoplastic Acrylic Denture Base Material. 3C
Tecnología. Glosas de innovación aplicada a la pyme, 12(1), 354-364. https://
doi.org/10.17993/3ctecno.2023.v12n1e43.354-364
https://doi.org/10.17993/3ctecno.2023.v12n1e43.354-364
ABSTRACT
Aim of the study: Using surface roughness and tensile bond strength tests, the
objective of this investigation was to ascertain the impact of laser surface modification
on the binding strength of injectable thermoplastic acrylic denture base material to
acrylic-based soft-liner material.
Materials and methods: Acrylic base soft liner material was bonded to injectable
thermoplastic acrylic resin (Deflex). Forty specimens were created (20 disc, 20
dumbbells) 10 of each specimen type as control specimens, and 10 were treated with
nano pulse Nd: YAG laser. The data were analyzed using the Kruskal-Wallis test and
unpaired t-test (a=.05) and the roughness test was performed utilizing a double
column universal test machine.
Results: Compared to the control groups, the laser group had much increased
roughness and tensile bond strength.
Conclusions. Following Nd:YAG laser surface treatment, the tensile bonding strength
between acrylic soft-liner material and thermoplastic acrylic was increased.
KEYWORDS
Thermoplastic acrylic, Nd:YAG laser, tensile bond strength, surface roughness test
PAPER INDEX
ABSTRACT
KEYWORDS
1. BACKGROUND
2. MATERIALS AND METHODS:
2.1. PATTERN SHAPES AND DIMENSIONS FOR MOLD PREPARATION
2.2. SURFACE ROUGHNESS TEST
2.3. TENSILE BOND STRENGTH TEST
3. RESULTS
3.1. SURFACE ROUGHNESS TEST
3.2. TENSILE BOND STRENGTH TEST
3.3. DISCUSSION
4. CONCLUSION
REFERENCES
https://doi.org/10.17993/3ctecno.2023.v12n1e43.354-364
3C Tecnología. Glosas de innovación aplicadas a la pyme. ISSN: 2254-4143
Ed.43 | Iss.12 | N.1 January - March 2023
355
1. BACKGROUND
Following a time of wearing removable dentures, several studies found that
patients invariably have badly fitting dentures as a result of bone resorption that
caused soft tissue shape changes (1, 2). The use of thermoplastic resins has a
number of benefits over traditional powder-liquid systems. With tooth or tissue colored
materials, they offer outstanding esthetics and are quite pleasant for the patient.
These exhibit excellent wear characteristics, high fatigue endurance, high creep
resistance, and solvent resistance in addition to being extremely stable and resisting
thermal polymer unzipping. In order to create more uniformly distributed force,
minimize localized pressure, and improve retention, the tissue surfaces of removable
dentures and maxillofacial prostheses are cushioned with denture lining materials (3,
4).
Studies confirmed the issue of failure between the soft liner and denture foundation
owing to many factors that have a negative impact on the bonding strength (5, 6). The
binding site should be improved and stronger bonds should result from mechanical
locking and increased surface roughness brought about by laser treatment of denture
base resin (7). It is quick and easy to determine how well a material or overlay is
connected to the substrate beneath using the tensile bond strength (pull-off) test. With
the help of this tester, you can decide if surface preparation is necessary, spot relative
changes in potential surface strength throughout a treatment region, and assess the
effectiveness of surface preparation (8).
2. MATERIALS AND METHODS:
Forty specimens were prepared from injectable thermoplastic dentures base
materials and grouped as follows:
1. Group TC: Twenty specimens of injectable thermoplastic acrylic denture base
material without laser treatment.
2. Group TT: Twenty specimens of injectable thermoplastic acrylic denture base
material subjected to surface treatment with Nd: YAG laser with power: 15 watt, hatch:
0.09, speed: 40 m/s, frequency: 20 Hz, and distance off 12 mm.
According to the tests required for this study the specimens were be divided into
two shapes; disc-shaped and dumbbell-shaped.
2.1. PATTERN SHAPES AND DIMENSIONS FOR MOLD
PREPARATION
The molds for the disc-shaped specimens were used with dimensions of (25mm x
2mm ± 0.1) diameter and thickness respectively. They were prepared by using high
accuracy Computer numerical control (CNC) to make the plastic shapes for the
specimens for measuring the surface roughness test. Dumbbell-shaped 3D printed
patterns with dimensions of 75 mm in length, 12 mm in diameter at the thick part, and
https://doi.org/10.17993/3ctecno.2023.v12n1e43.354-364
3C Tecnología. Glosas de innovación aplicadas a la pyme. ISSN: 2254-4143
Ed.43 | Iss.12 | N.1 January - March 2023
356