Biomedical subjects
Publications and source records attributed to D Harari.
A serial study of changes in spacing between teeth during the period of facial maturation, finding tendencies toward closure of buccal spaces and opening of anterior spaces. Spacing in females is equally distributed between upper and lower arches; in males it is more prevalent in the upper arch.
We studied the effectiveness of a sustained-release delivery system for chlorhexidine in plaque prevention. A clinical trial in a group of eight students wearing orthodontic appliances coated by ethyl cellulose polymer containing the drug demonstrated that plaque accumulation was decreased for a period of four days. All oral procedures had been withdrawn during the clinical study. No side-effects of chlorhexidine, such as tooth staining and unpleasant taste, were observed.
The present investigation deals with the functional recovery of the periodontium following application of intrusive loads of varying magnitudes to continuously growing rat incisors. The daily rate of eruption of these teeth served as an indicator of the functional capacity of their periodontal ligament. The left mandibular incisor was shortened to prevent occlusion in thirty experimental and ten control rats. The experimental animals were divided into three groups and constant, calibrated axial loads of 8 Gm./cm.2 (light), 15 Gm./cm.2 (medium), and 26 Gm./cm.2 (heavy) were applied to their incisors by means of closed-coil springs for a period of 2 weeks. The daily eruption rate of all teeth was measured for 80 days following removal of the springs. In all experimental animals, severe and long-lasting impairment of the eruptive potential occurred. The least impairment was seen in the group with the light loads, their eruption rate being fully restored 64 days after removal of the loads, by which time 165 percent of all dental and periodontal tissues was renewed. In the medium-load group, renewal of the tissues reached 140 percent, while a gross impediment in normal eruption rate persisted throughout the entire experimental period. The teeth subjected to heavy loads received a diminished impact of the axially directed loads due to the strong horizontal component of force; consequently, they behaved like the incisors of the light-load group. The light loads proved to cause the least impairment and were the most beneficial to functional recovery.
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