Abstract: The present invention provides a unitary, adjustable mouth prop having jaw engaging plates connected by a spring. The plates hold a resilient molding material to comfortably and securely contact a patient's teeth. The plates are further connected by an adjusting mechanism which is used to adjust and maintain a controlled occlusal opening. The adjusting mechanism is made of a screw extending from each plate and an internally threaded sleeve connecting the two screws. The sleeve is threaded to either draw together or separate the screws and their attached jaw engaging plates, thereby closing or opening the occlusal opening. This sleeve and screw adjusting mechanism allows for easy and gradual adjustment of the size of the occlusal opening, without disruption of the dental procedure or discomfort to the patient.

Abstract: A system and method for writing a policy insuring against the occurrence of a specified weather condition. Historical data of weather conditions is accumulated and stored in a computer memory. When a policy is to be written, information identifying the amount A of the policy, the weather condition against which the policy is to insure, the location of interest, and the time period of interest is applied to the computer which then calculates the policy premium as P=(A.times.N.div.I)+E, or as P=(A.times.N.div.I).times.C, where N is the number of occurrences of the specified weather condition during I previous time intervals, E is a factor compensating for overhead expense and profit, and C is a constant. The policy is then written in the amount A at the premium P. Where the policy is to insure over an extended time period or in multiple locations, the premium is adjusted to cover the probability of occurrence of the specified weather condition in any of the locations.