Dentofacial effects after the use of bone anchorage pendulum appliance

Document Type : Original Article

Authors

Orthodontic Department, Faculty of Dentistry, Tanta University, Tanta, Egypt

Abstract

This study was conducted to evaluate the dentofacial changes
after distalization of maxillary first molars using the bone anchorage
pendulum appliance (BAPA) and the conventional pendulum
appliance (PA) in the treatment of dental Class II.
Thirty patients were selected from the clinic of Orthodontic
Department, Faculty of Dentistry, Tanta University, seeking
orthodontic treatment. Their ages were ranged from 13-16 years for
both sexes. The patients were divided into two equal groups. The
first group consisted of 15 patients treated with Hilgers pendulum
appliances (PA). The second group consisted of 15 patients were
treated with bone anchorage pendulum appliances (BAPA). The
skeletal and dental changes were measured on lateral cephalometric
x-ray films and dental casts obtained before and after the distalization.
T- test was used for statistical evaluation.
In both groups all first maxillary molars were moved distally
into a super class I relationship successfully in 6.49 months for
BAPA group and 5.65 months for PA group, The average amounts
of molar distal movement and tipping were (5.12 mm, 7.6°) in the
BAPA group and (6.19 mm, 8.8°) in the PA group. The result
showed that, the molar tipped 1.48° per millimeter of distal tooth
movement in BAPA group, and 1.42° per millimeter in PA group.
The maxillary second premolars, first premolars and central incisors
in BAPA group exhibited significant distal movement which
would positively affect the prognosis in contrast there was a
significant mesial tipping of the maxillary first premolars and
central incisors in PA group. Regarding anterior anchorage, there
was a reciprocal anchorage loss in the form of maxillary incisors
protrusion in PA group; however BAPA group showed no anchorage
loss. Lower anterior and total anterior Facial heights increased
significantly during the treatment in the two groups. The maxillary
intermolar widths were significantly increased in both groups. The
maxillary arch perimeter was increased in both groups, which was more
pronounced in PA group indicating anchorage loss.
The results showed that the BAPA appliance is an effective
and minimally invasive, compliance free alternative for intraoral
molar distalization without anchorage loss.

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