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Effect of different pH solvents on micro-hardness and surface topography of dental nano-composite: An in vitro analysis.

Khan AA, Siddiqui AZ, Al-Kheraif AA, Zahid A, Divakar DD - Pak J Med Sci (2015 Jul-Aug)

Bottom Line: A strong significant difference was seen between Group D and Group A.Group A and Group C showed no significant difference.The micro-hardness test showed reduced values among all samples.

View Article: PubMed Central - PubMed

Affiliation: Aftab Ahmed Khan, MSc, M.Bioeth, B.D.S Researcher, Dental Biomaterials Research Chair, College of Applied Medical Sciences, King Saud University, Riyadh 11433; Saudi Arabia.

ABSTRACT

Objective: Erosion of tooth surface is attributed to recent shift in diet pattern and frequent use of beverages. The aim of this research was to evaluate the effects of different beverages on surface topography and hardness of nano-filled composite material.

Methods: Sixty flat disc shaped resin composite samples were fabricated and placed in distilled water for 24 hours. After 24 hours test samples were dried and divided into 4 groups. Group A (n=15) specimens were placed in tight amber bottle comprising 25 ml of artificial saliva. Similarly Group B, C and D were stored in equal amounts of orange juice, milk and coca cola drink respectively. Samples were checked for hardness and surface changes were evaluated with scanning electron microscopy.

Results: There were strong significant difference observed in samples immersed in orange juice and artificial saliva. A strong significant difference was seen between Group D and Group A. Group A and Group C showed no significant difference. The micro-hardness test showed reduced values among all samples.

Conclusion: Beverages consumed daily have a negative influence on hardness and surface degradation of nano-filled dental composite. Comparatively, nano-filled composites possess higher surface area to volume ratio of their fillers particle size may lead to higher surface roughness than other resin based dental biomaterials.

No MeSH data available.


Related in: MedlinePlus

SEM micrographs of nano-filled composite specimen immersed in citric acid at different magnifications.
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Figure 2: SEM micrographs of nano-filled composite specimen immersed in citric acid at different magnifications.

Mentions: Irrespective of immersion medium, all specimens presented surface changes when observed under scanning electron microscopy at different magnifications. Several voids, cracks, roughness and protruding particles were observed in all specimens confirming the process of surface changes and erosion of the matrix. Although the pH of Group A specimens was 6.9 yet the artificial saliva is mainly composed of water and the effect of water uptake can degrade polymeric material.18 The specimens of Group B & D showed strong significant difference comparing to Group A. This was expected as the specimens of Group B & D were stored in orange juice and coca cola drink for 14 days without the buffering factor of saliva. Saliva through buffering substances keep the pH near neutral and wash away acidic environment and limit the softening of the enamel surfaces.19 Clinically, these beverages effects on polymeric composites may be different due to some factors such as acquired biofilm, dietary habits, and oral care products; which cannot be reproduced in vitro. These factors either acting alone or together may interfere with the physical and mechanical properties of the materials; influencing the durability of the polymeric resin composite. Although we daily consume acidic foods and drinks yet the composite materials show no immediate effect on their physical and mechanical properties. Excluding the samples of Group A, the samples of Group B, C and D all showed marked surface roughness and degradation (Fig. 2, 3 & 4). Samples of Group A shows surface roughness only (Fig.1). Morphological analysis of the composite material illustrates the values found in micro-hardness testing.


Effect of different pH solvents on micro-hardness and surface topography of dental nano-composite: An in vitro analysis.

Khan AA, Siddiqui AZ, Al-Kheraif AA, Zahid A, Divakar DD - Pak J Med Sci (2015 Jul-Aug)

SEM micrographs of nano-filled composite specimen immersed in citric acid at different magnifications.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4590396&req=5

Figure 2: SEM micrographs of nano-filled composite specimen immersed in citric acid at different magnifications.
Mentions: Irrespective of immersion medium, all specimens presented surface changes when observed under scanning electron microscopy at different magnifications. Several voids, cracks, roughness and protruding particles were observed in all specimens confirming the process of surface changes and erosion of the matrix. Although the pH of Group A specimens was 6.9 yet the artificial saliva is mainly composed of water and the effect of water uptake can degrade polymeric material.18 The specimens of Group B & D showed strong significant difference comparing to Group A. This was expected as the specimens of Group B & D were stored in orange juice and coca cola drink for 14 days without the buffering factor of saliva. Saliva through buffering substances keep the pH near neutral and wash away acidic environment and limit the softening of the enamel surfaces.19 Clinically, these beverages effects on polymeric composites may be different due to some factors such as acquired biofilm, dietary habits, and oral care products; which cannot be reproduced in vitro. These factors either acting alone or together may interfere with the physical and mechanical properties of the materials; influencing the durability of the polymeric resin composite. Although we daily consume acidic foods and drinks yet the composite materials show no immediate effect on their physical and mechanical properties. Excluding the samples of Group A, the samples of Group B, C and D all showed marked surface roughness and degradation (Fig. 2, 3 & 4). Samples of Group A shows surface roughness only (Fig.1). Morphological analysis of the composite material illustrates the values found in micro-hardness testing.

Bottom Line: A strong significant difference was seen between Group D and Group A.Group A and Group C showed no significant difference.The micro-hardness test showed reduced values among all samples.

View Article: PubMed Central - PubMed

Affiliation: Aftab Ahmed Khan, MSc, M.Bioeth, B.D.S Researcher, Dental Biomaterials Research Chair, College of Applied Medical Sciences, King Saud University, Riyadh 11433; Saudi Arabia.

ABSTRACT

Objective: Erosion of tooth surface is attributed to recent shift in diet pattern and frequent use of beverages. The aim of this research was to evaluate the effects of different beverages on surface topography and hardness of nano-filled composite material.

Methods: Sixty flat disc shaped resin composite samples were fabricated and placed in distilled water for 24 hours. After 24 hours test samples were dried and divided into 4 groups. Group A (n=15) specimens were placed in tight amber bottle comprising 25 ml of artificial saliva. Similarly Group B, C and D were stored in equal amounts of orange juice, milk and coca cola drink respectively. Samples were checked for hardness and surface changes were evaluated with scanning electron microscopy.

Results: There were strong significant difference observed in samples immersed in orange juice and artificial saliva. A strong significant difference was seen between Group D and Group A. Group A and Group C showed no significant difference. The micro-hardness test showed reduced values among all samples.

Conclusion: Beverages consumed daily have a negative influence on hardness and surface degradation of nano-filled dental composite. Comparatively, nano-filled composites possess higher surface area to volume ratio of their fillers particle size may lead to higher surface roughness than other resin based dental biomaterials.

No MeSH data available.


Related in: MedlinePlus