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The effect of ascorbic acid levels on orthodontically induced tooth mobility
Reviews and
abstracts
335
Malrotations of individual teeth varied from 6 to 75 degrees. Anterior (lateral incisors and canines) and posterior (second premolars) rotated teeth were included in the study. Following orthodontic correction, the supra-alveolar fibers around one of the rotated teeth in the arch were transected and the arch was mechanically retained for 30 days. Following the 30-day retention period, the retaining bands and wires on the surgically and nonsurgically treated teeth were removed, and alginate impressions were taken at intervals of 4 hours, I day, 8 days, and 30 days. Casts were reproduced at various time intervals on a Xerox duplicating machine, and angular measurements of the rotated teeth were made and compared. Mean differences and variances were evaluated statistically. It VJ:LSfound that anterior and posterior teeth responded differently to surgical intervention after a l-day postretention period of instability. Nonsurgically treated anterior teeth and surgically treated posterior teeth showed greater relapse tendencies than their respective antemeres. At 30 days postretention, nonsurgically treated anterior teeth had a 17 per cent greater relapse tendency than surgically treated anterior teeth. At this same interval, surgically treated posterior teeth had a 19 per cent greater relapse tendency than non. surgically treated posterior teeth. Conclusions indicate that transection of the supra-alveolar fibers following rotational correction of anterior teeth increased their postrentention stabilit,, for the time interval studied. Similar surgical intervention actually increased the relapse of posterior teeth. Therefore, transection of supra-alveolar fibers would not be a recommended adjunct to orthodontic therapy for orthodonticall> rotated posterior teeth. The Effect of Tooth Mobility Emanuel
Ascorbic
Acid
Levels
on
Orthodontically
Induced
EL Wasserman
New Pork University
College of Dentistry
A clinical study was made to investigate the effect of altered tissue ascorbic acid levels on orthodontically induced tooth mobility. Fifty-one male and female orthodontic patients aged 12 years 4 months to 16 years 4 months were studied. The urine saturation test was employed to monitor states of saturation and depletion with vitamin C. The Muhlemann macroperiodontometer was employed to measure tooth mobility, The experimental group consisted of twelve patients whose stores of vitamin C were depleted by dietary restriction and eleven patients whose tissues were saturated with ascorbic acid throughout the experimental period. Tooth mobility of the maxillary right and left canines was assessed during the canine-retraction phase of treatment (edgewise technique). Retraction force was delivered via elastic ligatures calibrated at 180 Gm. at each activation. Data analysis shows a significantly greater increase in mobility in the vitamin C-depleted group throughout the period of canine retraction. Also, a return of mobility to a physiologic range after a 6-week period of canine stabilization was
336
Reviews and abstracts
Am.
J. Orthod.
Se~tenaber1976
not noted in the vitamin C-depleted group. The mobility detected in members of the saturated group did return to within physiologic limits. However, complete recovery to original base line levels did not occur in either group. 1. A relationship between subclinical scurvy and tooth mobility has been reported in the literature. 2. Tooth mobility always occurs as a result of the application of orthodontic forces to teeth. Excessive orthodontic forces cause pathologic mobility. Ascorbic acid deficiency results in impaired wound healing. 3. There may be a cumulative effect of the tissue-destruction potential inherent in orthodontic procedures and impaired wound healing noted in ascorbic acid deficiency. Optimal force levels and conditions for optimal tissue response should be of basic concern to the orthodontist.
AA0
MEETING
CALENDAR
1977-Atlanta, Georgia, May 21 to 26, Georgia World 1978-Anaheim, California, April 15 to 21, Convention 1979-Washington, D. C., May 6 to 11 1980-New Orleans, Louisiana, April 27 to May 1 1981-San Francisco, California, May 3 to 7 1982-Atlanta, Georgia, May 1 to 6
Congress Center
Center
abstracts
335
Malrotations of individual teeth varied from 6 to 75 degrees. Anterior (lateral incisors and canines) and posterior (second premolars) rotated teeth were included in the study. Following orthodontic correction, the supra-alveolar fibers around one of the rotated teeth in the arch were transected and the arch was mechanically retained for 30 days. Following the 30-day retention period, the retaining bands and wires on the surgically and nonsurgically treated teeth were removed, and alginate impressions were taken at intervals of 4 hours, I day, 8 days, and 30 days. Casts were reproduced at various time intervals on a Xerox duplicating machine, and angular measurements of the rotated teeth were made and compared. Mean differences and variances were evaluated statistically. It VJ:LSfound that anterior and posterior teeth responded differently to surgical intervention after a l-day postretention period of instability. Nonsurgically treated anterior teeth and surgically treated posterior teeth showed greater relapse tendencies than their respective antemeres. At 30 days postretention, nonsurgically treated anterior teeth had a 17 per cent greater relapse tendency than surgically treated anterior teeth. At this same interval, surgically treated posterior teeth had a 19 per cent greater relapse tendency than non. surgically treated posterior teeth. Conclusions indicate that transection of the supra-alveolar fibers following rotational correction of anterior teeth increased their postrentention stabilit,, for the time interval studied. Similar surgical intervention actually increased the relapse of posterior teeth. Therefore, transection of supra-alveolar fibers would not be a recommended adjunct to orthodontic therapy for orthodonticall> rotated posterior teeth. The Effect of Tooth Mobility Emanuel
Ascorbic
Acid
Levels
on
Orthodontically
Induced
EL Wasserman
New Pork University
College of Dentistry
A clinical study was made to investigate the effect of altered tissue ascorbic acid levels on orthodontically induced tooth mobility. Fifty-one male and female orthodontic patients aged 12 years 4 months to 16 years 4 months were studied. The urine saturation test was employed to monitor states of saturation and depletion with vitamin C. The Muhlemann macroperiodontometer was employed to measure tooth mobility, The experimental group consisted of twelve patients whose stores of vitamin C were depleted by dietary restriction and eleven patients whose tissues were saturated with ascorbic acid throughout the experimental period. Tooth mobility of the maxillary right and left canines was assessed during the canine-retraction phase of treatment (edgewise technique). Retraction force was delivered via elastic ligatures calibrated at 180 Gm. at each activation. Data analysis shows a significantly greater increase in mobility in the vitamin C-depleted group throughout the period of canine retraction. Also, a return of mobility to a physiologic range after a 6-week period of canine stabilization was
336
Reviews and abstracts
Am.
J. Orthod.
Se~tenaber1976
not noted in the vitamin C-depleted group. The mobility detected in members of the saturated group did return to within physiologic limits. However, complete recovery to original base line levels did not occur in either group. 1. A relationship between subclinical scurvy and tooth mobility has been reported in the literature. 2. Tooth mobility always occurs as a result of the application of orthodontic forces to teeth. Excessive orthodontic forces cause pathologic mobility. Ascorbic acid deficiency results in impaired wound healing. 3. There may be a cumulative effect of the tissue-destruction potential inherent in orthodontic procedures and impaired wound healing noted in ascorbic acid deficiency. Optimal force levels and conditions for optimal tissue response should be of basic concern to the orthodontist.
AA0
MEETING
CALENDAR
1977-Atlanta, Georgia, May 21 to 26, Georgia World 1978-Anaheim, California, April 15 to 21, Convention 1979-Washington, D. C., May 6 to 11 1980-New Orleans, Louisiana, April 27 to May 1 1981-San Francisco, California, May 3 to 7 1982-Atlanta, Georgia, May 1 to 6
Congress Center
Center