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Ultrasonic margin preparation for fixed prosthodontics: a pilot study.

Poppy Horne1, Vincent Bennani, Nicholas Chandler

  • 1Department of Oral Rehabilitation, University of Otago School of Dentistry, Dunedin, New Zealand.

Journal of Esthetic and Restorative Dentistry : Official Publication of the American Academy of Esthetic Dentistry ... [Et Al.]
|June 14, 2012
PubMed
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New ultrasonic instruments create smoother, better-defined crown preparation margins compared to traditional rotary instruments. This advancement in prosthodontic margin finishing may lead to more successful dental prostheses.

Area of Science:

  • Dental Materials Science
  • Prosthodontics
  • Biomaterials Engineering

Background:

  • Advancements in dental technology are crucial for improving prosthodontic procedures.
  • Margin finishing is a critical step in crown preparation, impacting prosthesis longevity.

Purpose of the Study:

  • To compare the efficacy of novel oscillating ultrasonic instruments versus conventional rotary instruments for prosthodontic margin finishing.
  • To evaluate the surface characteristics and definition of crown preparation margins created by each instrument type.

Main Methods:

  • An in vitro study utilizing a split-tooth model with two extracted human canine teeth.
  • Margins were finished using both conventional rotary and novel ultrasonic instruments.
  • Scanning electron microscopy and surface roughness analysis were employed for quantitative and qualitative evaluation.

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Main Results:

  • Ultrasonic instruments yielded margins with a superior axial wall/margin angle definition and smoother surfaces.
  • Surface roughness analysis indicated ultrasonic margins were approximately 50% smoother than those finished with rotary instruments.
  • Rotary instruments produced a sharper external line angle, while ultrasonic instruments offered a more refined margin overall.

Conclusions:

  • Oscillating ultrasonic instruments produce superior quality margins compared to conventional rotary instruments.
  • The improved margin quality achieved with ultrasonic instruments may enhance the success rate of fixed prosthodontic restorations.
  • These findings suggest practical advantages and clinical significance for ultrasonic instruments in prosthodontic procedures.