Do lasers improve the outcomes of non-surgical periodontal therapy?

Based on the indexed literature, adjunctive laser therapy generally provides some clinical benefit over scaling and root planing (SRP) alone, though the magnitude and durability of that benefit vary by laser type, pocket depth, and follow-up period.

A systematic review of 20 RCTs found that 70% reported significantly better outcomes in at least some clinical parameters when a laser was used adjunctively, while 30% showed no significant difference compared to conventional treatment alone ^[1]. A meta-analysis of 16 RCTs confirmed that laser-assisted SRP was superior to SRP alone across most clinical parameters in non-smoking chronic periodontitis patients, with no treatment-related adverse events reported ^[2].

Regarding specific laser types, the combination of Nd:YAG and Er:YAG lasers produced additional average reductions in pocket depth and clinical attachment level of approximately 1.01 mm and 0.77 mm respectively compared to controls ^[3]. Nd:YAG laser adjunct showed selective efficacy in deep pockets (≥7 mm) in stage III periodontitis, reducing inflammatory mediators such as IL-6 and TNF-α, but minimal impact on shallower pockets (4–6 mm) ^[4]. High-intensity diode laser therapy demonstrated consistently superior clinical attachment level gains compared to both low-intensity diode laser and SRP alone ^[5]. Erbium lasers and low-level laser therapy (LLLT) appear to offer mainly short-term benefits at 1–3 months, with no significant additional benefit demonstrated at 6 months or beyond ^[6][7].

In summary, lasers can improve short-term periodontal outcomes as adjuncts to SRP, particularly in deeper pockets, but long-term benefits remain uncertain and further well-designed RCTs with standardised protocols are needed ^[1][2][6][7].