Effects of glass ionomer and microfilled composite subgingival restorations on periodontal tissue and subgingival biofilm: a 6-month evaluation.
BACKGROUND
This 6-month study evaluated the effects of resin-modified glass-ionomer cement (RMGI) and microfilled composite (MC) subgingival restorations on periodontal tissues and subgingival biofilm.


METHODS
Fifty-four periodontally healthy patients were assigned as follows: group 1 (N = 18), root exposure (RE) without non-carious cervical lesions (NCCL) treated with coronally positioned flap (CPF); group 2 (N = 18), RE with NCCL treated RMGI restorations plus CPF; group 3 (N = 18), RE with NCCL treated with MC restorations plus CPF. Probing depth (PD), visible local plaque score (PL), and local bleeding on probing (BOP) were assessed at baseline and 6 months after surgeries. Restored and non-restored root recoverage (RR) was assessed at 6 months. Each experimental tooth was subgingivally sampled (baseline and 6 months) and analyzed by checkerboard DNA-DNA hybridization.


RESULTS
Clinical results showed no significant differences among the groups regarding PL, BOP, and PD at baseline and 6 months. The RR means were similar among the groups at 6 months. Intragroup analyses revealed that the proportions of 10 periodontopathogens decreased at 6 months for the control group. For the RMGI group, there was a significant decrease in the proportions of nine periodontopathogens. For the MC group, there was a significant increase in the proportions of Fusobacterium nucleatum polymorphum and Gemella morbillorum and a decrease in five periodontopathogens. Intergroup analyses showed an increase in the proportion of F. nucleatum polymorphum for the MC group.


CONCLUSIONS
In a 6-month evaluation, well-finished RMGI or MC subgingival restorations did not negatively affect periodontal health. Furthermore, RMGI seems to exert more positive effects on the subgingival biofilm composition than MC.
Department of Periodontics, Dental Research Division, Guarulhos University, Guarulhos, SP, Brazil.
Vanessa Renata
VR
Santos
Juliana Antico
JA
Lucchesi
Sheila Cavalca
SC
Cortelli
Cristiane Mariote
CM
Amaral
Magda
M
Feres
Poliana Mendes
PM
Duarte
D000328:Adult; D000368:Aged; D016976:Aggregatibacter actinomycetemcomitans / Q000302:isolation & purification; D001419:Bacteria / Q000145:classification / Q000302:isolation & purification; D018441:Biofilms; D003188:Composite Resins / Q000737:chemistry*; D003773:Dental Plaque / Q000145:classification; D003793:Dental Restoration, Permanent; D005260:Female; D005500:Follow-Up Studies; D016967:Fusobacterium nucleatum / Q000145:classification; D005884:Gingival Hemorrhage / Q000145:classification; D005899:Glass Ionomer Cements / Q000737:chemistry*; D006801:Humans; D008297:Male; D008875:Middle Aged; D010514:Periodontal Pocket / Q000145:classification; D010519:Periodontium / Q000382:microbiology / Q000473:pathology*; D016966:Porphyromonas gingivalis / Q000302:isolation & purification; D011446:Prospective Studies; D019279:Resin Cements / Q000737:chemistry*; D040141:Staphylococcaceae / Q000145:classification; D013524:Surgical Flaps; D014076:Tooth Diseases / Q000382:microbiology / Q000628:therapy; D014092:Tooth Root / Q000382:microbiology / Q000473:pathology; D048373:Treponema denticola / Q000302:isolation & purification
D003188:Composite Resins; D005899:Glass Ionomer Cements; D019279:Resin Cements