Lars Granath

Failures and healing in endodontically treated non-vital anterior teeth with posttraumatically reduced pulpal lumen

The aim of the present investigation was to assess the frequency of technical failures as well as the 4-year results of endodontic treatment in non-vital incisors with post-traumatically reduced pulpal lumen. In 54 teeth the smallest width of the root canal was measured and classified as 0. less than or equal 0.1, greater than 0.1- less than or equal to 0.2 or greater than 0.2 mm. The total frequency of failures was 20%. In upper incisors it was 15-17% in the classes up to a root canal width of 0.2 mm. In lower incisors with no or only partially visible root canal it was 71% and in the class up to 0.1 mm 10%, the difference being significant at the 5% level. The total frequency of healing after 4 years was 80%, while in teeth with a technical failure at the time of treatment the frequency was 50%. The difference between the group without and that with technical failures was statistically significant at the 5% level.

Progression of proximal enamel caries in early teens related to caries activity

Posterior bite-wing radiographs were available from 3 annual check-ups of 126 individuals 12-13 years of age at the start of the study. Enamel caries was defined according to Granath et al. (2), the lesions graded and the progression largely scored (score = transition between grades) according to Grondahl et al. (4). About 400 surfaces were observed for 2 years and approximately 950 for 1 year (year 1 or year 2). After subdivision, 2-year observations were included in the 1-year observations. The radiographic interpretation was made simultaneously by 2 examiners. A double determination revealed 86% agreement with the first registration. The individual caries activity during the 1-year period under consideration was expressed as the percentage of surfaces that had become carious during the period out of the number of available surfaces at the end of the period minus those that had been carious and filled at the start. The material was subdivided into 5 activity classes. In the 1-year material, there was a ...

Clinical evaluation of preventive and class-I composite resin restorations

This study was initiated in 1986 in response to increased interest in restorative procedures favoring preservation of tooth substance and in the search for alternatives to dental amalgams. Eighty-seven preventive resin restorations in permanent molars and 35 occlusal composite resin restorations in primary molars (limited size) and 13 in premolars were followed up for 2 years. They were placed by a large number of operators, mainly dental students under supervision, and rated by five calibrated instructors in accordance with an internationally accepted system for the evaluation of the clinical performance of dental materials. One composite resin (Occlusin) was used. A survival model was used to calculate the cumulative theoretical number of successful treatments of children who had dropped out. For none of the 6 clinical variables was the success rate lower than 91%, and only 3 of 26 failures were of a nature requiring remake or correction. The failures occurred, with a few exceptions, during the 1st year of observation. The two types of restoration have thus proved to be efficient treatments fulfilling all reasonable requirements in modern operative dentistry.