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A long-term assessment of the mechanical retroclination of lower incisors
DEPARTMENT
OF
REVIEWS
AND
ABSTRACTS
ICdited by Dr. New
J. A. Salzmann York City
A11 inquiries the respective addressed to
A long-Term lower
regarding information authors. Articles Dr. .7. A. Salzmann,
Assessment
of
the
or
on reviews books for
654
Mechanical
and abstracts should be directed to review in this department should be Madison Ave., New York, New York IOMl.
Retroclination
of
Incisors
J. R. E. Mills Angle Orthod.
37:
165-174,
July,
1967
An investigation was made of twenty-two patients in whom, as part of treatment, t,he lower first premolars were extracted and the lower incisors mechanically retroclined. All the cases were at least 12 months out of retention. The incisors had been tilted through at least 7 degrees with an average of 13.9 degrees. Retroclination was achieved largely by lingual movement of the incisal edge, with only minimal labial movement of the root apex. On the average, approximately one third of the incisal movement relapsed, as did about half the angular change. There was a widespread individual variation. The average amount of permanent lingual displacement of the incisal edge \vas about 2.66 mm. Half of this would have been achieved by the extractions alone. It is doubtful whether mechanical retroclination is clinically worthwhile, especially as the response is so unpredictable. The long-term change in the position of the incisal edge of a comparable group of Class III cases is similar to that in the main experimental group, but further retroclination is obtained by labial movement of the root apex. Gingivitis S. Alldritt Dent.
&act.
and 22:
lmbrication 60-68,
October,
197
Irregularity in tooth alignment is often associated with long-standing inflammatory changes in the gingiva investing such teeth. The most obvious way in which malalignment may predispose to gingivitis is by rendering certain part,s of the clinical crowns inaccessible to cleaning processes. The optimum level of gingival margin is as close to the enamel margin as the inherent characteristics of the epithelial attachment will allow. This level of gingival margin can change as a result of an inflammatory or hyperplastic condition, but it may also occur developmentally and may predispose the gingival to pat,hologic changes. The factors contributing to recession are (1) the form of the teeth, (2) the alignments of the teeth, (3) the form of the socket margin, and (a) the level of the socket margin on the root or, more precisely, the relation of socket margin to enamel margin. Orthodontic treatment renders the teeth more accessible to the toothbrush.
OF
REVIEWS
AND
ABSTRACTS
ICdited by Dr. New
J. A. Salzmann York City
A11 inquiries the respective addressed to
A long-Term lower
regarding information authors. Articles Dr. .7. A. Salzmann,
Assessment
of
the
or
on reviews books for
654
Mechanical
and abstracts should be directed to review in this department should be Madison Ave., New York, New York IOMl.
Retroclination
of
Incisors
J. R. E. Mills Angle Orthod.
37:
165-174,
July,
1967
An investigation was made of twenty-two patients in whom, as part of treatment, t,he lower first premolars were extracted and the lower incisors mechanically retroclined. All the cases were at least 12 months out of retention. The incisors had been tilted through at least 7 degrees with an average of 13.9 degrees. Retroclination was achieved largely by lingual movement of the incisal edge, with only minimal labial movement of the root apex. On the average, approximately one third of the incisal movement relapsed, as did about half the angular change. There was a widespread individual variation. The average amount of permanent lingual displacement of the incisal edge \vas about 2.66 mm. Half of this would have been achieved by the extractions alone. It is doubtful whether mechanical retroclination is clinically worthwhile, especially as the response is so unpredictable. The long-term change in the position of the incisal edge of a comparable group of Class III cases is similar to that in the main experimental group, but further retroclination is obtained by labial movement of the root apex. Gingivitis S. Alldritt Dent.
&act.
and 22:
lmbrication 60-68,
October,
197
Irregularity in tooth alignment is often associated with long-standing inflammatory changes in the gingiva investing such teeth. The most obvious way in which malalignment may predispose to gingivitis is by rendering certain part,s of the clinical crowns inaccessible to cleaning processes. The optimum level of gingival margin is as close to the enamel margin as the inherent characteristics of the epithelial attachment will allow. This level of gingival margin can change as a result of an inflammatory or hyperplastic condition, but it may also occur developmentally and may predispose the gingival to pat,hologic changes. The factors contributing to recession are (1) the form of the teeth, (2) the alignments of the teeth, (3) the form of the socket margin, and (a) the level of the socket margin on the root or, more precisely, the relation of socket margin to enamel margin. Orthodontic treatment renders the teeth more accessible to the toothbrush.