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Ultrasonic Margin Preparation for Fixed Prosthodontics: A Pilot Study
Author(s) -
HORNE POPPY,
BENNANI VINCENT,
CHANDLER NICHOLAS,
PURTON DAVID
Publication year - 2012
Publication title -
journal of esthetic and restorative dentistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.919
H-Index - 60
eISSN - 1708-8240
pISSN - 1496-4155
DOI - 10.1111/j.1708-8240.2011.00477.x
Subject(s) - fixed prosthodontics , ultrasonic sensor , prosthodontics , margin (machine learning) , dentistry , orthodontics , medicine , biomedical engineering , computer science , radiology , machine learning
Purpose: Atraumatic, oscillating ultrasonic instruments have recently been developed for prosthodontic margin finishing. This in vitro observational pilot study aimed to compare the condition of crown preparation margins finished using new ultrasonic instruments with margins finished with conventional rotary instruments. Methods: Two extracted human canine teeth were prepared for crowns. A split‐tooth model was used to refine the margins: half of the margin was finished with conventional rotary instruments, the other with ultrasonic instruments. The profiles of the margins were observed using scanning electron microscopy, and a quantitative comparison of surface roughness was obtained using surface roughness analysis software. Results: The margins finished with the ultrasonic instruments exhibited a better‐defined axial wall/margin angle and a smoother marginal surface. Rotary instruments produced a sharper and more continuous external line angle. Two‐dimensional surface roughness analysis showed that the margins produced with the ultrasonic instruments were approximately half as rough as the margins prepared with the conventional rotary instruments. Conclusion: The ultrasonic instruments produce margins in better condition than the current standard and appear to have some practical advantages. CLINICAL SIGNIFICANCE Preparations for fixed prosthodontics finished with these ultrasonic instruments created better‐defined margins, which could result in more successful prostheses. (J Esthet Restor Dent ••:••–••, 2011)