Heat Induced Changes to Dental Resin Composites: A Reference in Forensic Investigations?*

The objective was to investigate color change and surface damage in dental resin composites exposed to high temperatures over different time intervals for comparative purposes. Samples were prepared using two resins - Z100(R) (R1) and Charisma (R2), heated at the following temperatures: 200 degrees C, 400 degrees C, 600 degrees C, 1000 degrees C, for 15, 30 and 45 min (n = 104 for each resin sample). Color (DeltaE) and brightness (DeltaL) changes were analyzed by spectrophotometry using the CIE Lab system and surface changes by Scanning Electron Microscopy (SEM). R1 showed more intense color changes after heat exposure than R2. DeltaL values were found to be the best parameter for evaluation of light and color change. A biphasic pattern after thermal exposure was detected, from dark brown to light white. SEM showed more intense alterations in R2 than in R1. These results indicate that the parameters observed in both resins are useful as a guide in forensic analyses.     

Kavanagh and Mckenzie on power

This article responds to an earlier analysis by Kavanagh which criticised the basic thesis of McKenzie's British Political Parties. The author of the present article believes that Kavanagh made some important criticisms of McKenzie, but it is still true that power in the Labour Party is similarly distributed to power in the Conservative Party ‐ broadly the parliamentary party is autonomous, and the Leader, especially in government, is in control of the party. Events since 1983 have served to underline this fact.     

Mind games: cognitive bias,US intelligence and the 1968 Soviet invasion of Czechoslovakia

This article examines the impact of cognitive bias on the analytic output of the United States intelligence community during the Prague Spring. Utilising a range of primary sources, including declassified documents, oral history and contemporary accounts, this article argues that as a result of heuristic biases, analysts formed the mindset that the Soviet Union would not invade Czechoslovakia, and did not alter that assumption in the face of increasing evidence to the contrary. Consequently analysts possessed a distorted understanding of both Soviet intentions and the prevailing political environment and did not accurately convey the likelihood of military action to consumers.     

Violence-Related Attitudes and Beliefs: scale construction and psychometrics

The 50-item Violence-Related Attitudes and Beliefs Scale (V-RABS) includes three subscales measuring possible causes of violent behavior (environmental influences, biological influences, and mental illness) and four subscales assessing possible controls of violent behavior (death penalty, punishment, prevention, and catharsis). Each subscale demonstrates good internal consistency and test-retest reliability. Thus, the V-RABS and its component subscales can be valuable research tools for understanding people's beliefs about the causes and controls of violent crime.