Biomedical subjects

Simon Yeh

Publications and source records attributed to Simon Yeh.

3 recordsLinked to original sources

PubMed2005

Using transitional implants as fixation screws to stabilize a surgical template for accurate implant placement: a clinical report.

This article describes a method of using transitional implants as surgical fixation screws to orient a surgical template predictably during the placement of implants in the anterior mandible for an implant-supported bar-retained overdenture. Ridge reduction, transitional implant placement, implant placement, and removal of the transitional implants were completed in a single surgical appointment. Details of the template fabrication, incorporating transitional implants and surgical techniques, are described.

Bone Screws↗

PubMed2004

Crown lengthening: basic principles, indications, techniques and clinical case reports.

Sometimes, in order to properly restore teeth, surgical intervention in the form of a crown-lengthening procedure is required. Crown lengthening is a periodontal resective procedure, aimed at removing supporting periodontal structures to gain sound tooth structure above the alveolar crest level. Periodontal health is of paramount importance for all teeth, both sound and restored. For the restorative dentist to utilize crown lengthening, it is important to understand the concept of biologic width, indications, techniques and other principles. This article reviews these basic concepts of clinical crown lengthening and presents four clinical cases utilizing crown lengthening as an integral part of treatments, to restore teeth and their surrounding tissues to health.

Alveolar Process↗

PubMed2002

Pesticide soil sorption parameters: theory, measurement, uses, limitations and reliability.

The soil sorption coefficient Kd and the soil organic carbon sorption coefficient KOC of pesticides are basic parameters used by environmental scientists and regulatory agencies worldwide in describing the environmental fate and behavior of pesticides. They are a measure of the strength of sorption of pesticides to soils and other geosorbent surfaces at the water/solid interface, and are thus directly related to both environmental mobility and persistence. KOC is regarded as a 'universal' parameter related to the hydrophobicity of the pesticide molecule, which applies to a given pesticide in all soils. This assumption is known to be inexact, but it is used in this way in modeling and estimating risk for pesticide leaching and runoff. In this report we examine the theory, uses, measurement or estimation, limitations and reliability of these parameters and provide some 'rules of thumb' for the use of these parameters in describing the behavior and fate of pesticides in the environment, especially in analysis by modeling.

Adsorption↗