The aim of this investigation was to evaluate the clinical and histological differences
in wound healing between beveled and perpendicular vertical releasing incisions in
Material and Methods
Four male mongrel dogs were used in this investigation. In each quadrant, a vertical
releasing incision was made on either the mesial or the distal aspect of the cuspid
teeth of each animal all on the same day. The sites were randomly selected to either
receive a beveled incision or a perpendicular incision. A sulcular muco-periosteal
flap was raised, reapproximated, and then sutured using 3-0 Vicryl. The animals were
evaluated daily for the first week, and then at different time intervals during this
investigation. One animal was killed at each time interval of 9, 14, 21, and 28 days
after surgery. One animal was killed at each time interval, and a bone block consisting
of the cuspid teeth and their surrounding bone and soft tissues was harvested, formalin
fixed, and paraffin embedded. Samples were sectioned serially and stained with hematoxylin-eosin.
Specimens were evaluated using a microscope with magnification ranging from ×10 to
×400 by a histopathologist. Four indices were used for histologic evaluation.
At day 9 after surgery, a visible groove was seen in the marginal tissues of both
perpendicular and beveled incisions. At day 9, both of the histologic sections showed
less organized connective tissue and capillary networks with no significant difference
in inflammation. In the 14-day samples, a depression was still present at the perpendicular
incision sites, but not in the beveled incision group, where the groove was not visualized
In the 21- and 28-day samples, irregular capillary arrangements were seen in the connective
tissue of the perpendicular incision groups with completely healed epithelium. There
were no statistically significant differences noted histologically between the beveled
and perpendicular incision groups noted at 9, 14, 21, or 28 days (P > .05).
Based on these findings, it appears that clinical and histologic healing of beveled
or perpendicular releasing incisions are similar 28 days after surgery.