Conclusion:
1. During the treatment with a total dose of 21 grams of fluoride in a two years period further compression fractures of vertebrae were noticed in 5 or 23 cases. No conclusion can be drawn of course from further compression fractures about the effectiveness of treatment. Concerning the peripheral skeleton an average decrease of the bone mineral content of the radius was observed.
2. The histological picture of the bone biopsies show on an average a positive influence of treatment after the mentioned dose and time.
3. Taking into consideration all parameters, an analysis of the individual cases shows a progression in 4 cases, an obvious amelioration of osteoporosis in 6 cases and in 13 cases nearly unchanged findings indicate no progression of the disease.