Comparative longitudinal study of 2 methods of scheduling maintenance visits; 2-year data

Area of Science:

• Periodontology
• Microbiology

Background:

• Periodontitis requires ongoing maintenance to prevent recurrence.
• Current maintenance schedules are often time-based, not tailored to individual microbiological states.

Purpose of the Study:

• To compare clinical and microbiological outcomes of periodontitis patients on fixed versus flexible maintenance schedules.
• To assess the impact of spirochete and motile rod proportions on disease recurrence.

Main Methods:

• Two groups of periodontitis patients received different prophylaxis schedules: control (every 3 months) and test (flexible, based on microbial analysis).
• Clinical (gingival index, plaque index, probing depth, attachment level) and microbiological assessments were performed at baseline, 1, and 2 years.
• Disease recurrence was defined as a ≥3 mm probing depth increase.

Main Results:

• Both groups showed similar increases in gingival and plaque index scores and slight attachment level increases over 2 years.
• No significant difference in probing depth was observed between groups.
• Disease recurrence was numerically higher in the control group, but not statistically significant.
• Test group subjects with recurrence had higher baseline spirochete proportions (20.2%) than those without (9.8%, p<0.01).

Conclusions:

• Flexible, microbiology-guided periodontal maintenance may offer a slight advantage in reducing disease recurrence.
• Elevated baseline spirochete levels may indicate a higher risk for disease recurrence, particularly in flexible maintenance groups.