Evaluation of surface roughness of aesthetic pediatric crowns using a brushing stimulator
Keywords:
Pediatric crowns, surface roughness, brushing simulator, profilometry, dental materials, wear resistanceAbstract
Background: Surface roughness plays a critical role in the longevity, esthetics, and biofilm accumulation of pediatric dental restorations. Aesthetic pediatric crowns are increasingly used; however, their resistance to mechanical wear from toothbrushing remains inadequately explored.
Aim: To evaluate and compare the surface roughness of aesthetic pediatric crowns before and after simulated toothbrushing using a brushing simulator.
Materials and Methods: Four samples of aesthetic pediatric crowns were analyzed. Surface roughness parameters—Ra (average roughness), Rq (root mean square roughness), and Rz (maximum peak-to-valley height)—were measured using a stylus profilometer before and after brushing simulation of approximately 30,000 cycles (equivalent to ~3 years of brushing). Data were statistically analyzed to assess changes in surface characteristics.
Results: All samples demonstrated a reduction in surface roughness after brushing simulation. Pre-brushing Ra values ranged from 0.998 to 3.560 µm, while post-brushing values ranged from 0.342 to 1.551 µm. Similar reductions were observed in Rq and Rz values. The findings indicate significant smoothing of crown surfaces after simulated brushing.
Conclusion: Simulated toothbrushing significantly reduces the surface roughness of aesthetic pediatric crowns, potentially improving resistance to plaque accumulation. However, material-specific wear patterns warrant further investigation..
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