Stress distributions are presented for a normal and a restored mandibular second premolar under masticatory-type forces. These were obtained using the finite element method of stress analysis applied to two-dimensional models. The effect of the relative stiffness of the materials is examined in each instance.
I argue that addiction is not a chronic, relapsing, neurobiological disease characterized by compulsive use of drugs or alcohol. Large-scale national survey data demonstrate that rates of substance dependence peak in adolescence and early adulthood and then decline steeply; addicts tend to "mature out" in their late twenties or early thirties. The exceptions are addicts who suffer from additional psychiatric disorders. I hypothesize that this difference in patterns of use and relapse between the general and psychiatric populations can be explained by the purpose served by drugs and alcohol for patients. Drugs and alcohol alleviate the severe psychological distress typically experienced by patients with comorbid psychiatric disorders and associated problems. On this hypothesis, consumption is a chosen means to ends that are rational to desire: Use is not compulsive. The upshot of this explanation is that the orthodox view of addiction as a chronic, relapsing neurobiological disease is misguided. I delineate five folk psychological factors that together explain addiction as purposive action: strong and habitual desire; willpower; motivation; functional role; and decision and resolve. I conclude by drawing lessons for research and effective treatment.
Effective treatment of personality disorder (PD) presents a clinical conundrum. Many of the behaviors constitutive of PD cause harm to self and others. Encouraging service users to take responsibility for this behavior is central to treatment. Blame, in contrast, is detrimental. How is it possible to hold service users responsible for harm to self and others without blaming them? A solution to this problem is part conceptual, part practical. I offer a conceptual framework that clearly distinguishes between ideas of responsibility, blameworthiness, and blame. Within this framework, I distinguish two sorts of blame, which I call 'detached' and 'affective.' Affective, not detached, blame is detrimental to effective treatment. I suggest that the practical demand to avoid affective blame is largely achieved through attention to PD service users' past history. Past history does not eliminate responsibility and blameworthiness. Instead, it directly evokes compassion and empathy, which compete with affective blame.
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