Factors Affecting the Strength of Denture Repairs

Seo, Rosangela Seiko; Neppelenbroek, Karin Hermana

doi:10.1111/j.1532-849x.2007.00191.x

Cited by 36 publications

(56 citation statements)

References 49 publications

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“…Repair edge profile and surface treatment were considered to be important factors influencing denture repair strength, in addition to another neglected factor, repair gap width. During the repair procedure, borders of a fractured denture are prepared to create a gap .…”

Section: Discussionmentioning

confidence: 99%

“…Dentures are susceptible to fracture. Thus, repair of broken dentures is a common clinical practice . Several repair materials, surface designs, and treatments are suggested to improve repair strength .…”

mentioning

confidence: 99%

“…The size of the gap created determines the amount of repair material added and, consequently, the strength of the repaired denture . Several studies of repairs have used different gap widths . Numerous studies tested a 10‐mm gap; others used 5‐mm and 3‐mm gaps .…”

mentioning

confidence: 99%

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Effect of Repair Gap Width on the Strength of Denture Repair: An In Vitro Comparative Study

Gad

Rahoma

Abualsaud

et al. 2019

Journal of Prosthodontics

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Purpose To evaluate the effect of repair gap width on the flexural strength and impact strength of a repaired acrylic denture with and without thermal cycling. Materials and Methods A total of 240 heat‐polymerized acrylic resin specimens were fabricated in dimensions of 65 × 10 × 2.5 ± 0.2 mm and 55 × 10 × 10 ± 0.2 mm for flexural strength and impact strength testing, respectively. All specimens were sectioned into halves then divided into 6 groups according to repair gap width (n = 10). The repair gap of the control group was 2.5 mm at the base, while the repair gaps of the test groups were prepared as 2.0, 1.5, 1.0, 0.5, and 0 mm at the base. All specimens were prepared with a 45° bevel joint. Each specimen was placed into the mold that retained the original length of the specimen and modified only the repair gap, which was packed with repair resin. After polymerization, specimens were finished and polished, and half of the specimens were thermal cycled for 5000 cycles. Three‐point bending test and Charpy impact test were used to determine the flexural strength and impact strength, respectively. ANOVA and Tukey's HSD test were used for statistical analysis, where α was set at 0.05. Results Decreasing repair gap significantly increased the flexural strength in comparison to control group (p < 0.05); 0.5‐mm repair gap showed the highest flexural strength values. Changing the repair gap significantly increased the impact strength of groups 2.0‐ and 1.5‐mm (p < 0.05). Thermal cycling significantly decreased the flexural strength of all tested groups as well as impact strength for groups with wide repair gaps (2.5‐, 2.0‐, and 1.5‐mm) (p < 0.05), while other tested groups had nonsignificant effect on impact strength (p > 0.05). Conclusion Decreasing repair gap increased the flexural and impact strengths of repaired acrylic resin. A repair gap of 0‐, 0.5‐, or 1.0‐mm with beveled repair surface is recommended to improve repair strength and overcome the drawbacks of increased amounts of autopolymerized repair resin.

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Section: Discussionmentioning

confidence: 99%

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confidence: 99%

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Effect of Repair Gap Width on the Strength of Denture Repair: An In Vitro Comparative Study

Gad

Rahoma

Abualsaud

et al. 2019

Journal of Prosthodontics

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“…Several mechanical and chemical surface treatments have been used to improve the adhesion between the denture base and repair materials 25) . Wetting the repair surfaces with MMA softens the PMMA, enhances the spread of superficial fissures, and forms pits in the bond surface 26) .…”

Section: Discussionmentioning

confidence: 99%

Effect of repair resin type and surface treatment on the repair strength of polyamide denture base resin

Gundogdu

Yanıkoğlu

Bayındır

et al. 2015

Dental Materials Journal

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The purpose of the present study was to evaluate the effects of different repair resins and surface treatments on the repair strength of a polyamide denture base material. Polyamide resin specimens were prepared and divided into nine groups according to the surface treatments and repair materials. The flexural strengths were measured with a 3-point bending test. Data were analyzed with a 2-way analysis of variance, and the post-hoc Tukey test (α=0.05). The effects of the surface treatments on the surface of the polyamide resin were examined using scanning electron microscopy. The repair resins and surface treatments significantly affected the repair strength of the polyamide denture base material (p<0.05); however, no significant differences were observed interaction between the factors (p>0.05). The flexural strength of the specimens repaired with the polyamide resin was significantly higher than that of those repaired with the heat-polymerized and autopolymerizing acrylic resins.

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“…The material to be used for the repair of denture base depends on the working time of the material, the strength to be attained, and the dimensional stability achieved during and after repair (30,31) .…”

Section: Introductionmentioning

confidence: 99%

The Effect of Nano- ZrO2 and nano-Al2O3 Reinforcement on Flexural and Impact Strength of Repaired Acrylic Denture Base

Al-Mahdy

Eltayeb

2018

ADJ-for Girls

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Purpose: This study was conducted to evaluate the effect of rein forcement of different concentrations of nano-ZrO 2 and nano-Al 2 O 3 on the flexural strength and impact strength of repaired acrylic resin denture bases. Materials and Methods: A total of 100 specimens were prepared from heat-polymerized acrylic resin and then they were equally divided for the flexural and impact strength tests. 50 specimens were assigned for each testing group. For the flexural strength testing, metallic rectangular molds with rectangular-shaped (65 mm length x10 mm width x 2.5 mm thickness) were prepared. While specimens for the impact strength testing were prepared using rectangular-shaped molds with dimensions of (50 mm length x6mm width x4mm thickness). The prepared intact specimens were cut vertically in two halves along their long axis. For the flexural and impact strength testing, a repair gap was done. Specimens for each strength test were divided into one control group (specimen repaired with autopolymerizing acrylic resin with no fillers) and two repair groups with 2 concentrations (2% and 5%) of nano-ZrO 2 fillers and two repair groups with 2 concentrations (2% and 5%) of nano-Al 2 O 3 fillers. Flexural strength was measured using an Instron mechanical testing machine and impact strength was measured by Izod impact tester. Results: For the flexural strength results, the highest flexural strength was recorded with the 5% nano-ZrO 2 fillers repair group followed by the 2% nanoZrO 2 group which also recorded higher significant mean value than the control group. In both nano-Al 2 O 3 groups, there was a highly significant reduction in the flexural strength for both concentrations. For the impact strength results, the highest impact strength was recorded for the 2% nanoZrO 2 fillers repair group followed by the 5% nano-ZrO 2 group which also recorded higher significant mean values than the control group. In the 2% nano-Al 2 O 3 repair group, there was a non-significant difference in the impact strength mean values compared with the control group. While the repair group reinforced with 5% nano-Al 2 O 3 showed significant reduction in impact strength. Conclusions:The incorpora tion of nano-ZrO 2 into repair resins may improve the flexural and impact strength of the repaired denture base whereas nano-Al 2 O 3 caused reduction of both strengths.

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Factors Affecting the Strength of Denture Repairs

Cited by 36 publications

References 49 publications

Effect of Repair Gap Width on the Strength of Denture Repair: An In Vitro Comparative Study

Effect of Repair Gap Width on the Strength of Denture Repair: An In Vitro Comparative Study

Effect of repair resin type and surface treatment on the repair strength of polyamide denture base resin

The Effect of Nano- ZrO2 and nano-Al2O3 Reinforcement on Flexural and Impact Strength of Repaired Acrylic Denture Base

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