Impact of photobiomodulation in alveolar ridge preservation and implant stability after a dental extraction: a systematic review.

The bone volume preservation after dental extraction is challenging in case of implant rehabilitation for functional and aesthetics results. Photobiomodulation (or LLLT) is used in medicine for its properties of accelerating the healing process. The aim of the systematic review was to determine if the use of photobiomodulation had an impact on implant stability and on alveolar bone healing, either in quality or in quantity. A systematic review following the PRISMA guidelines was conducted on the databases PubMed, Science Direct, Scopus and Google Scholar. The review was registered on Prospero under the number CRD42023467581. 414 articles were screened, of which 12 were selected for the review. In 10 of the 12 articles, LLLT seemed to show a positive impact on bone healing and implant stability. Regarding alveolar preservation, 6 out of 8 studies found statistically significant results. Regarding implant stability, 3 out of the 4 articles found a statistically significant impact of photobiomodulation versus control group. Despite the great heterogeneity of the studies, some LLLT protocols seemed consensual: the use of a Ga-Al-As laser with an emission over 800 nm with a continuous emission consisting of 3 to 4 sessions each with a duration of 4 to 5 min, on a sole application point. The use of photobiomodulation seemed to inhance the alveolar bone healing after a dental extraction, and the implant stability in case of immediate extraction-implantation. Further randomized controlled trials with a placebo group seem mandatory to corroborate the results.