The effect of postsurgical antibiotics on the healing of intrabony defects following treatment with enamel matrix proteins.

Abstract

Regenerative treatment with enamel matrix proteins has been shown to promote healing in intrabony defects. However, up to now various postoperative antibiotic regimens have been used in combination with enamel matrix proteins and therefore it cannot be excluded that the results may also be attributable to the effect of the antibiotic treatment. The aim of this randomized, controlled, blinded, clinical investigation was to determine the effect of postsurgical administration of antibiotics on the healing of intrabony periodontal defects treated with enamel matrix proteins. Thirty-four patients each of whom exhibited one deep intrabony defect were randomly treated with either enamel matrix proteins plus antibiotics (test: EMD + AB) or with enamel matrix proteins alone (control: EMD). The antibiotic regimen consisted of a combination of 3 x 375 mg amoxicillin and 3 x 250 mg metronidazole daily for 7 days. The following parameters were recorded at baseline and at 1 year by the same calibrated and blinded investigator: plaque index (PI), gingival index (GI), bleeding on probing (BOP), probing depth (PD), gingival recession (GR), and clinical attachment level (CAL). Power analysis to determine superiority of antibiotic treatment showed that the available sample size would yield 85% power to detect a 1 mm difference. No statistically significant differences in any of the investigated parameters between the 2 groups were observed at baseline. No serious adverse events such as allergic reactions or abscesses after any of the treatments were observed during the entire study period. The results have shown that in the EMD + AB group the PD decreased from 9.1 +/- 1.5 mm to 4.5 +/- 1.1 mm (P<0.0001) and the CAL changed from 11.0 +/- 1.6 mm to 7.5 +/- 1.4 mm (P<0.0001). In the EMD group the PD decreased from 9.0 +/- 1.7 mm to 4.3 +/- 1.7 mm (P <0.0001) and the CAL changed from 10.6 +/- 1.6 mm to 7.3 +/- 1.5 mm (P <0.0001). There were no significant differences in any of the investigated parameters between the 2 groups. It can be concluded that the systemic administration of amoxicillin and metronidazole adjacent to the use of EMD for the surgical treatment of intrabony periodontal defects does not produce statistically superior PD reduction and CAL gain when compared to treatment with EMD alone. Hence, the present results do not support the routine administration of amoxicillin and metronidazole following regenerative treatment with EMD.