A radiation boost to the lumpectomy cavity margin
as part of breast conservation therapy is the standard of care to minimize cancer recurrence.
37.5% phosphoric acid was used to etch the cavity margin
and walls for
Cavities were coded according to outline form, retention form, smoothness, cavity depth and cavity margin
Combining the traditional technique of cavity margin
refinishing, acid etching of the enamel and the dentine with the laser preparation technique, the advantages of both techniques can be employed.
(6,7) A study of 1430 patients undergoing lumpectomy showed that negative margins were achieved on initial resection in 1225 patients (86%).4 More recently, separate cavity margin
sampling at the time of initial lumpectomy has been used to reduce the number of reexcisions for positive lumpectomy margins.
The remaining 626 respondents (78%) reported that surgeons submit separate cavity (shave) margins in at least a subset of cases--of these, 310 (50%) examine additional cavity margins
in fewer than 10% of cases, 246 (39%) in 10% to 50% of cases, and 70 (11%) in more than half of cases.
This crown would be fixed to the internal walls of thepulp chamber and on the cavity margins
to improve macromechanical retention and the use of adhesive cementation would also improve microretention .
Class V cavities were prepared on the buccal surface of extracted premolar using round diamond bur for initial penetration followed by straights fissure bur to extend the cavity margins
. Profilometer was used to measure the depth of cavity, i.e.
Basal cavity margins
do not protrude the platform margins in most specimens; but in some specimens show slightly protrusion (Fig.
Adaptation of the restorative materials to cavity margins
and internal cavity surfaces are crucial for long-term performance of restorations, especially for cavities with high configuration factor such as class V cavities .
were re-excised at the same procedure and a second specimen with new orientations was sent for permanent sections.
The results of this study show that none of the restorative materials used is capable of perfectly adapting to the cavity margins