Modified measuring compass as an intraoral paralleling device.

Department of Prosthodontics, Government Dental College and Hospital, Nagpur, Maharashtra, India.
Indian journal of dental research: official publication of Indian Society for Dental Research 01/2010; 21(3):452-3. DOI: 10.4103/0970-9290.70794
Source: PubMed

ABSTRACT This article describes a simple technique of useful modification of measuring compass, procured from a school compass box, to make an intraoral paralleling device. This device is useful in examining parallelism of tooth or implant abutment preparations for a common path of placement in fixed dental prostheses. It can be used to examine the parallelism of guiding planes in removable partial denture patients as well.

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    ABSTRACT: The abutment(s) of a partial fixed dental prosthesis (PFDP) should have a minimal total occlusal convergence (TOC), also called a taper, in order to ensure adequate retention of a PFDP that will be made for the abutment(s), given the height of the abutment(s). This article reviews the concept of PFDP abutment TOC and presents an alternative definition of what TOC is, defining it as the extent to which the shape of an abutment differs from an ideal cylinder shape of an abutment. This article also reviews experimental results concerning what is the ideal TOC in degrees and explores clinical techniques of estimating the TOC of a crown abutment. The author suggests that Dentists use high magnification loupes (×6-8 magnification or greater) or a surgical operating microscope when preparing crown abutments, to facilitate creating a minimum abutment TOC.
    European journal of dentistry 03/2013; 7(4):509-513. DOI:10.4103/1305-7456.120665

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