Simulated toothbrushing abrasion increases surface roughness of all resin composites: Study

Medically Reviewed By : Dr. Kamal Kant Kohli

Published On 2021-06-21 04:00 GMT | Update On 2021-06-21 05:09 GMT

Researchers from a recent study have observed that Simulated toothbrushing abrasion led to an increase in surface roughness and a decrease in gloss for DMA-free composite and Bis-GMA-free composite with a DMA-based composite.

The study is published in the Dentistry Journal.

Murtadha AlAli and colleagues from the Prosthodontic Department, Alahsa Dental Centre, Ministry of Health, Alahsa, Saudi Arabia carried out the present study to evaluate and compare the surface roughness and gloss of a DMA-free composite and Bis-GMA-free composite with a DMA-based composite before and after toothbrushing simulation.

Fifteen dimensionally standardised composite specimens of three nano-hybrid resin composites (Tetric EvoCeram, Admira Fusion, and Venus Diamond) were used. Five specimens from each composite were polished and then subjected to a toothbrushing simulator.

Surface roughness (Ra) and gloss were measured before toothbrushing and after 5000, 10,000, 15,000, and 20,000 toothbrushing cycles. The data was analysed using 5 × 3 ANOVA to assess surface roughness and gloss values and pairwise comparisons in the form of Tukey post hoc tests were performed to interpret main effects.

The following findings were highlighted-

a. For all tested materials, surface roughness increased, and gloss decreased after toothbrushing abrasion.

b. Surface roughness (Ra) values ranged from 0.14 to 0.22 μm at baseline and increased to between 0.41 and 0.49 μm after 20,000 toothbrushing cycles.

c. Gloss values ranged between 31.9 and 50.6 GU at baseline and between 5.1 and 19.5 GU after 20,000 toothbrushing cycles.

d. The lowest initial Ra value was detected in Venus Diamond and the highest initial gloss value was detected in Tetric EvoCeram.

Therefore, the authors concluded that "simulated toothbrushing abrasion led to an increase in surface roughness and a decrease in gloss for all tested materials. Venus Diamond had the smoothest surface and Tetric EvoCeram had the glossiest surface after polishing and following 20,000 cycles of toothbrushing abrasion. Admira Fusion demonstrated the roughest surface and had the lowest gloss values before and after toothbrushing abrasion."

Article Source : Dentistry Journal

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Dr. Nandita Mohan

Dr. Nandita Mohan is a practicing pediatric dentist with more than 5 years of clinical work experience. Along with this, she is equally interested in keeping herself up to date about the latest developments in the field of medicine and dentistry which is the driving force for her to be in association with Medical Dialogues. She also has her name attached with many publications; both national and international. She has pursued her BDS from Rajiv Gandhi University of Health Sciences, Bangalore and later went to enter her dream specialty (MDS) in the Department of Pedodontics and Preventive Dentistry from Pt. B.D. Sharma University of Health Sciences. Through all the years of experience, her core interest in learning something new has never stopped. She can be contacted at editorial@medicaldialogues.in. Contact no. 011-43720751

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Simulated toothbrushing abrasion increases surface roughness of all resin composites: Study

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