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- W4300822611 abstract "The purpose of the investigation was to assess whether supra-alveolar connective tissue formed following periodontal surgery carried out subsequent to orthodontic tooth movement is an effective barrier to relapse. The experiments were carried out on five beagle dogs. At the start of the study (Day 0) the mandibular third premolars ( 3 P and P 3 ) were extracted and experimental periodontal breakdown was initiated around the lower fourth premolars ( 4 P and P 4 ) by placing cotton floss ligatures around the neck of the teeth. After 180 days of plaque formation the cotton floss ligatures were removed. The diseased periodontal tissues around 4 P were removed surgically and silver markers, serving as future reference points, were placed in the buccal bone plate close to the apex of the roots of 4 P. At the same session amalgam fillings were placed in the buccal surface of the mesial and distal roots of 4 P and P 4 . During the next 34 weeks (between Day 180 and Day 420), the dogs' teeth were brushed three times a week. On Day 225 orthodontic appliances were inserted bilaterally to tip 4 P and P 4 . Active orthodontic forces were used between Day 225 and Day 300. Between Day 300 and Day 360 the orthodontic appliances served as retainers for the moved teeth. On Day 360 the periodontal tissues around P 4 were removed surgically and silver reference points were placed into the bone as described earlier. On Day 360 the orthodontic appliances were removed. The dogs were sacrificed on Day 420. The difference in position of 4 P and P 4 was measured on radiographs taken on days 300, 360 and 420 and it was found that (1) during the 'period of retention' the difference in position of 4 P and P 4 was close to zero and (2) during the ‘period of relapse’ the movement of 4 P and P 4 was small and the difference between the right and left jaws not significant. The investigation demonstrated that no significant differences exist between supra-alveolar connective tissue formed prior to or after orthodontic tipping movements regarding the prevention of relapse." @default.
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- W4300822611 date "1980-01-01" @default.
- W4300822611 modified "2023-10-03" @default.
- W4300822611 title "Orthodontic relapse in dentitions with reduced periodontal support: An experimental study in dogs" @default.
- W4300822611 doi "https://doi.org/10.1093/ejo/2.1.51" @default.
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