ABSTRACT
The effects of 40 interdental osteotomies on surrounding osseous and periodontal structures were evaluated clinically and radiographically. No statistically significant changes were noted in any of the clinical parameters except gingival height, which decreased slightly in the maxilla and increased in the mandible. These changes were found to be statistically significant, but not clinically significant, and are most likely explained by the direction of movement of the bony segment. Radiographic evaluations revealed no statistically significant changes other than an increase in interdental width in both the maxillary and mandibular sites. These measurements were made at the root level, and, although the crowns were moved closer, the roots may actually have flared apart because the anterior segment was tipped to upright the incisors. The lack of change in the other radiographic parameters indicated that there was no loss of alveolar bone support.
Subject(s)
Alveolar Process , Osteotomy/methods , Periodontium , Adolescent , Adult , Child , Dental Plaque Index , Female , Humans , Male , Middle Aged , Osteotomy/adverse effects , Periodontal Index , Tooth MobilityABSTRACT
Two experiments investigating the effects of motion sickness on pica (the consumption of non-nutritive substances) are reported. In the first experiment rats subject to rotational stimulation subsequently engaged in geophagia (clay consumption). In the second experiment use of a conditioned aversion paradigm confirmed that the method of rotational stimulation used in the first experiment causes motion sickness in rats. The results of these experiments indicate that simple gastrointestinal malaise in the absence of a deficiency state or acute toxemia will elicit pica. It is suggested that gastrointestinal distress may be a significant factor in the etiology of pica and its relationship to other causes of pica is discussed.
