What’s in a typo?

By Jan Tunér

The reporting of irradiation parameters in PBM is essential, to say the least. For that very reason, a small typo can lead readers of the literature in the wrong direction. The Gomes group in Brazil has presented three very good papers on the use of PBM in dental implantology. There is only one problem. In the study no 3 below, there is a typo, stating 20 J of energy in the poor rabbits, while actually being 20 J/cm². And maybe yet another problem: an email to the corresponding author remains unanswered. This unintended problem can be corrected by authors by using PubMed Commons. I have taken care of that now myself.


  1. Gomes FV, Mayer L, Massotti FP, Baraldi CE, Ponzoni D, Webber JB, de Oliveira MG.Low-level laser therapy improves peri-implant bone formation: resonance frequency, electron microscopy, and stereology findings in a rabbit model. Int J Oral Maxillofac Surg. 2015 Feb;44(2):245-51.

The results showed better ISQ for the 20 J/cm² group (BIC values were significantly higher in the 20 J/cm² group, on both SEM and stereology. Bone area values were better in the 10 J/cm² and 20 J/cm² groups compared to the control group. Under these conditions, LLLT enhanced peri-implant bone repair, improving stability, BIC, and bone neoformation. The findings support and suggest parameters for the design of clinical trials using LLLT after implant placement.

  1. Massotti FP, Gomes FV, Mayer L, de Oliveira MG, Baraldi CE, Ponzoni D, Puricelli E. Histomorphometric assessment of the influence of low-level laser therapy on peri-implant tissue healing in the rabbit mandible. Photomed Laser Surg. 2015 Mar;33(3):123-8. doi: 10.1089/pho.2014.3792.

Photobiostimulation with LLLT at an energy density of 20 J/cm² per session had a significant positive effect on new bone formation around dental implants inserted in the rabbit mandible.

  1. Mayer L, Gomes FV, Carlsson L, Gerhardt-Oliveira M. Histologic and Resonance Frequency Analysis of Peri-Implant Bone Healing After Low-Level Laser Therapy: An In Vivo Study. Int J Oral Maxillofac Implants. 2015 Sep-Oct;30(5):1028-35.

To evaluate the effects of low-level laser therapy (LLLT) on peri-implant bone regeneration by means of resonance frequency analysis and histologic analysis of bone-to-implant contact (BIC). Laser therapy at a dose of 20 J per treatment session, based on the irradiation protocol used in this study, was able to significantly increase ISQ values and BIC after implant placement, indicating that laser irradiation effected an improvement in peri-implant bone healing.

We all make typos, yours truly no exception. But when called upon, I am willing to correct them, and especially if appearing in a scientific context.