Effect of different mechanical surface treatments on flexural strength of repaired denture base.
Aim: To assess the effect of different mechanical surface treatments on flexural strength of repaired denture base.
Material and Methods: Sixty bar-shaped specimens of heat-polymerized acrylic resin were fabricated, and divided into six groups (n=10). All specimens, except the positive control group (group PC), were sectioned into halves to create a 1-mm clearance. A negative control group with no surface treatment (group NC) was also considered. Other groups underwent different surface treatments: group Laser; treated with erbium: yttrium-aluminum-garnet (Er:YAG) laser, group APA; airborne-particle abrasion (APA), group APA plus Laser; a combination of laser and APA, and group Bur; bur grinding. After measuring surface roughness (Ra) with a profilometer, all sectioned specimens were repaired by auto-polymerizing acrylic resin, and thermocycled afterward. Three-point bending test was performed by a universal testing machine. Data were statistically analyzed (α=0.05).
Results: The mean surface roughness of all experimental groups were significantly higher than that of group NC (p<0.05). The mean flexural strength of all groups was significantly lower than that of group PC (p<0.05). Group B had significantly higher flexural strength than the other surface-treated groups (p<0.05). Group Laser had significantly higher flexural strength than groups APA (p=0.043) and APA plus Laser (p=0.023). No significant difference was found between groups APA and APA plus Laser (p=0.684).
Conclusion: All surface treatments increased the surface roughness and flexural strength compared with the untreated group. The highest flexural strength was observed in specimens treated by bur grinding and then laser, however, it was still significantly lower than intact specimens.
. AlQahtani M, Haralur SB. Influence of different repair acrylic resin and thermocycling on the flexural strength of denture base resin. Medicina. 2020;56(2):50-9.
. Asli HN, Hemmati YB, Ghaffari M, Falahchai M. Satis-faction of patients with mandibular implant-supported overdentures using a generalized estimating equation model: A prospective study. J Osseointegration. 2021.
. Sari F, Ustun O, Kirmali O. Efficacy of various pretreat-ments on the bond strength of denture teeth to denture base resins. Photomed laser surg. 2018;36(4):214-20.
. Andrade de Freitas SL, Brandt WC, Miranda ME, Vitti RP. Effect of thermocycling, teeth, and polymerization methods on bond strength teeth-denture base. Int J Dent. 2018.
. Atalay S, Çakmak G, Fonseca M, Schimmel M, Yilmaz B. Effect of thermocycling on the surface properties of CAD-CAM denture base materials after different sur-face treatments. J. Mech. Behav. Biomed. Mater. 2021.
. Gad MM, Al-Thobity AM. The impact of nanoparticles-modified repair resin on denture repairs: a systematic review. Jpn Dent Sci Rev. 2021;57:46-53.
. Gad MM, Rahoma A, Abualsaud R, Al-thobity AM, Akhtar S, Helal MA, Al-Harbi FA. Impact of different surface treatments and repair material reinforcement on the flexural strength of repaired PMMA denture base material. Dent Mater J. 2020;39;471-82.
. Mamatha N, Madineni PK, Sisir R, Sravani S, Nallamilli S, Jyothy JR. Evaluation of transverse strength of heat cure denture bases repaired with different joint surface contours: An in vitro study. J Contemp Dent Pract. 2020; 21(2):166-70.
. Vasthare A, Shetty S, Shenoy KK, Shetty M, Parveen K, Shetty R. Effect of different edge profile, surface treatment, and glass fiber reinforcement on the transverse strength of denture base resin repaired with autopolymerizing acrylic resin: An in vitro study. J Interdiscip Dentistry. 2017;7(1):31-7.
. Tamore SH, Jyothi K, Muttagi S, Gaikwad AM. Flexural strength of surface-treated heat-polymerized acrylic resin after repair with aluminum oxide-reinforced autopolymerizing acrylic resin. Contemp Clin Dent. 2018;9;347-53.
. Li P, Krämer-Fernandez P, Klink A, Xu Y, Spintzyk S. Repairability of a 3D printed denture base polymer: Effects of surface treatment and artificial aging on the shear bond strength. J Mech Behav Biomed Mater. 2021;114:104227.
. Qaw MS, Abushowmi TH, Almaskin DF, AlZaher ZA, Gad MM, Al-Harbi FA, Abualsaud R, Ammar MM. A novel approach to improve repair bond strength of repaired acrylic resin: an in vitro study on the shear bond strength. J Prosthodont. 2020;29(4):323-33.
. Alkurt M, Duymuş ZY, Gundogdu M. Effect of repair resin type and surface treatment on the repair strength of heat-polymerized denture base resin. J Prosthet Dent. 2014;111(1):71-8.
. Aziz HK. Changes in the transverse strength of heat-cured acrylic denture base by using diodes laser as surface treatment. Tikrit Journal for Dental Sciences. 2016;4(2):102-10.
. Akin H, Tugut F, Mutaf B, Akin G, Ozdemir AK. Effect of different surface treatments on tensile bond strength of silicone-based soft denture liner. J Lasers Med Sci. 2011;26(6):783-8.
. Muddugangadhar BC, Mawani DP, Das A, Mukhopadhyay A. Bond strength of soft liners to denture base resins and the influence of different surface treatments and thermocycling: A systematic review. J Prosthet Dent. 2020;123:800-6.
. Akin H, Kirmali O, Tugut F, Coskun ME. Effects of different surface treatments on the bond strength of acrylic denture teeth to polymethylmethacrylate denture base material. Photomed laser surg. 2014;32(9):512-6.
. Ragher M, Prabhu UM, Ittigi JP, Naik R, Mahesh C, Pradeep M. Efficacy of denture cleansers on impact strength of heat polymerized acrylic resins. J Pharm Bioallied Sci. 2017;9:S241.
. Jahandideh Y, Falahchai M, Pourkhalili H. Effect of surface treatment with Er:YAG and CO2 lasers on shear bond strength of Polyether Ether Ketone to composite resin veneers. J Lasers Med Sci. 2020;11:153-9.
. Asli HN, Rahimabadi S, Hemmati YB, Falahchai M. Effect of different surface treatments on surface roughness and flexural strength of repaired 3D-printed denture base: An in vitro study. J Prosthet Dent. 2021.
. Gad MM, Rahoma A, Abualsaud R, Al-Thobity AM, Fouda SM. Effect of repair gap width on the strength of denture repair: an in vitro comparative study. J Prosthodont. 2019;28(6):684-91.
. Sadighpour L, Geramipanah F, Falahchai M, Tadbiri H. Marginal adaptation of three-unit interim restorations fabricated by the CAD-CAM systems and the direct method before and after thermocycling. J. Clin. Exp. Dent. 2021;13(6):e572.
. Silva CdS, Machado AL, Chaves CdAL, Pavarina AC, Vergani CE. Effect of thermal cycling on denture base and autopolymerizing reline resins. J. Appl. Oral Sci. 2013;21(3):219-24.
. Korkmaz T, Dogan A, Murat Dogan O, Demir H. The bond strength of a highly cross-linked denture tooth to denture base polymers: a comparative study. J Adhes Dent. 2011;13(1):85.
. Yadav NS, Khare S, Mishra SK, Vyas R, Mahajan H, Chitumalla R. In-vitro evaluation of transverse strength of repaired heat cured denture base resins without surface treatment and with chemical and mechanical surface treatment. J Int Oral Health. 2015;7(8):89-92.
. Nakhaei M, Dashti H, Ahrari F, Vasigh S, Mushtaq S, Shetty RM. Effect of different surface treatments and thermocycling on bond strength of a silicone-based denture liner to a denture base resin. J Contemp Dent Pract. 2016; 17(2):154-9.
. Kostić M, Najman S, Najdanović J, Krunić N, Kostić I. Application of direct contact test in evaluation of cytotoxicity of acrylic denture base resins. Acta Medica Medianae. 2012;51(1):66-72.
This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms. © 2023.