Indiana University-Purdue University Indianapolis (IUPUI) / The effect of untimely loss of deciduous molars on the eruption
and development of succedaneous premolars was serially studied in eight
children in the mixed dentition stage from 45 degree cephalometric films
made at three and six month intervals. Each child had one mandibular
deciduous molar removed for reasons other than periapical infection and
a lingual arch space maintainer provided. The premolar beneath the
extracted molar served as the study tooth; its antimere, as the control
tooth.
Eruptive movement was measured as the distance between the cusp-tip
of a premolar on a superpositioned initial tracing and the corresponding
cusp-tip on successive films. Antero-posterior movement of
premolars was evaluated on a composite tracing along grid lines oriented
to a common base line. Tooth formation was assessed by the increase
in root length on successive films.
Variation was found in the amounts of eruptive movement and root
growth during a three month interval, for all premolars within the
sample, within an individual and for a single tooth. In no case did a
control tooth erupt more than a study tooth in a given interval. The
initial effect of deciduous molar loss on eruptive movement in this
study appeared to be accelerative. Tooth development was not found to
be effected. While moderate correlation was found between eruptive
movement and root growth for all premolars, one process did not appear
to be solely dependent on the other. A posterior component of eruptive
movement was occasionally demonstrated but was not related to the extraction.
The clinical value of this study is limited due to its small
sample and short duration. Longer and more comprehensive studies of
this problem are recommended.
| Identifer | oai:union.ndltd.org:IUPUI/oai:scholarworks.iupui.edu:1805/4350 |
| Date | January 1964 |
| Creators | Bowers, Donald Frederick, 1935- |
| Source Sets | Indiana University-Purdue University Indianapolis |
| Language | en_US |
| Detected Language | English |
| Type | Thesis |
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