Presentation of the Edward E. Hatton Awards

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/66537/2/10.1177_00220345650440060501.pd

Chemical Analysis of Human Teeth

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/67137/2/10.1177_00220345560350051201.pd

Evaluation of nematicidal potential of neem sawdust against Meloidogyne arenaria on eggplant

The present study was conducted to evaluate the impact of amending soil with decomposed neem (Azadirachta indica) sawdust at different concentrations (0-100%) against different inoculum levels (0-4000) of root-knot nematode (Meloidogyne arenaria) infecting the eggplants. Various physico-chemical properties of the soil increase as the concentration of decomposed neem sawdust (NSD) in the field soil increases. Nevertheless, the nitrogen content of the soil decreased with a progressive fluctuation in NSD. Lower levels (10-30%) of NSD, with and without different inoculum levels, improve the plant growth and photosynthetic pigment content significantly compared to controls (plants with uninoculated soil) as well as inoculated plants. The maximum improvement in the growth and photosynthetic pigments was recorded at 30% NSD soil amendment and this was continuously effective against all the nematode inoculum levels. At higher levels of NSD (40-100%), all the studied growth and photosynthetic parameters were decreased gradually to control and a similar reductional trend was also observed on nematode inoculated eggplants. On root-knot nematode reproduction, NSD at all levels progressively suppressed the number of egg masses but enhanced the number of galls only up to 30%. Galling was, however, totally absent in 70% and onward dust treatments of eggplants. Conclusively, NSD suppressed plant growth and photosynthetic pigments along with nematode buildup beyond 40% amendments. Thus, lower NSD levels (up to 30% amendments) will be recommended as growth and photosynthetic pigments supplement to eggplants, which also have nematicidal potential against egg masses of nematodes

A New Dental Superalloy System: II. Mechanical Properties

Cobalt-base alloys strengthened by intermetallic compounds of tantalum were prepared and tested. Some of the alloys were stronger and more ductile than conventional base-metal alloys.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/66613/2/10.1177_00220345730520010801.pd

Microstructure and Physical Properties of Alloys for Partial Denture Castings

Four types of alloys were investigated from the viewpoint of effect of composition and casting technic on the microstructure and mechanical properties. The microstructures are shown and correlated with the mechanical properties.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/68086/2/10.1177_00220345680470020201.pd

Flow and Fracture of Dental Alloys Determined by a Microbend Tester

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/68027/2/10.1177_00220345620410010801.pd

A New Dental Superalloy System: IV. X-Ray Diffraction Analysis

X-ray diffraction analysis of the alloy system Co-Ni-Cr-Ta showed that the ternary alloy base consisted of three phases (a, β, and σ). Addition of Ta caused a decrease in the intensity of the β lines. Further Ta additions caused diffraction lines characteristic of the intermetallic compound α-Co3Ta. At higher Ta concentrations, the intensity of the lines characteristic of the σ phase increased and lines characteristic of Co2Ta appeared.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/66588/2/10.1177_00220345730520041701.pd

Initiation of Cracks in Dental Amalgam

The force required to initiate cracks in dental amalgam beams was measured and related to the microstructure. The force measured was dependent on age and on the distribution of phases on the tension side of the beam. The Ag-Cu phase is most resistant to failure in Dispersalloy and an experimental alloy.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/67365/2/10.1177_00220345750540060601.pd

Dr. Floyd Avery Peyton in memoriam

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/31365/1/0000277.pd

Microstructure of Dental Amalgams Containing High and Low Copper Contents

Microstructure of commercial dental alloys and their amalgams were studied primarily by x-ray diffraction, optical metallography, scanning electron microscopy, and x-ray energy dispersive spectroscopy. X-ray diffraction revealed more phases than normally reported in these materials. Presence of new phases was discussed and their formation mechanism understood. Some phases having interacting 2θ° values with others were properly identified. Both new and conventional dental alloys and their amalgams, namely Tytin, Sybraloy, Dispersalloy, Kerr Spheraloy, Caulk Spherical, Shofu Spherical, and Caulk 20th Century Microcut were used to complete the investigation.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/67943/2/10.1177_00220345770560121001.pd