This review comparing whether implant supported crowns on short or standard implants have similar clinical outcomes in the posterior alveolar bone included 5 RCTs. the findings suggested no differences at one year but that shorter implants performed less well at 5 years.
This review of the the efficacy of probiotics on oral Candida spp. includes 12 RCTs and suggests a possible benefit. However the quality of the evidence is limited so the findings should be intepreted cautiously.
This review comparing the effects of envelope and triangular flaps for mandibular third molar surgery included 20 RCTs involving 770 patients. A majority of the studies were of cross-over design with the findings suggesting no differences in teh outcomes between the two flap designs.