British Journal of Nutrition

Short Communication

Overdenture with immediate load: mastication and nutrition

Tânia de Freitas Borgesa1 c1, Francielle Alves Mendesa1, Terezinha Rezende Carvalho de Oliveiraa1, Célio Jesus do Pradoa1 and Flávio Domingues das Nevesa1

a1 Department of Occlusion, Fixed Prosthodontics and Dental Materials, School of Dentistry, Federal University of Uberlândia, Avenida Pará, 1720, Bloco 2B, Sala 01, Campus Umuarama, Uberlândia 38400-902, MG, Brazil


Lower conventional complete dentures were converted to overdentures retained by two implants with an immediately loaded bar-clip system (n 16). The masticatory performance test was carried out using ‘Optocal’ after forty chewing strokes. Nutritional condition was evaluated by means of a Mini-Nutritional-Assessment questionnaire. No individual was classified as malnourished. The masticatory performance test demonstrated a statistically significant difference before conversion (baseline) and 3 and 6 months after conversion of the lower conventional complete denture to an implant-retained overdenture (paired-samples t test; P < 0·05). A statistically significant difference before and after 6 months of conversion for nutritional condition (Wilcoxon test; P < 0·05) was also observed. The association between masticatory performance and nutritional assessment demonstrated that a statistically significant difference between masticatory performance of the subgroups classified at baseline as nourished (22·43 %) and those at risk of malnutrition (3·9 %) was only evidenced before conversion (P = 0·006). After the conversion from a lower conventional complete denture to an implant-retained overdenture, at 3 months, the risk of malnutrition and nourished at baseline did not present significant differences in masticatory performance. Nonetheless, the mean masticatory performance potential was 19·86 and 31·98 % for subgroups classified at baseline as at risk of malnutrition and nourished, respectively (P = 0·187). The results before conversion were less favourable for masticatory performance and nutritional condition. The increased retention of the mandibular prosthesis allowed improvement in masticatory performance and nutritional condition.

(Received March 01 2010)

(Revised October 15 2010)

(Accepted October 18 2010)

(Online publication December 06 2010)


c1 Corresponding author: T. de Freitas Borges, fax +55 34 32329286, email