Influence of mandibular residual ridge resorption on objective masticatory measures of lingualized and fully bilateral balanced denture articulation.
OBJECTIVE
To assess the influence of mandibular residual ridge resorption (RRR) on objective masticatory measures of two occlusal schemes: lingualized occlusion (LO) and fully bilateral balanced articulation (FBBA).


METHODS
The enrolled patients (n=22) were randomly allocated one set of complete dentures with either LO or FBBA. Maximum occlusal force, masticatory performance (by the MPI), and mandibular movements were measured at 3- and 6-month follow-ups. Mandibular RRR was assessed as the sum of the mandibular bone height at the midline, first premolar region, and least vertical height region, and from the mental foramen to the alveolar crest, measured on panoramic radiographs; the treatment groups were subclassified into severe or moderate RRR subgroups by the value of the sum of individual measurements.


RESULTS
Significant differences were observed in the between-subgroup comparisons (Kruskal-Wallis test) of the MPI (3 months, p=0.01; 6 months, p=0.04) and linear deviation from intercuspal position (anterior-posterior: 6 months, p=0.01; inferior-superior: 3 months, p=0.008; 6 months, p=0.02). The patients with severe RRR in the FBBA group showed a significant decrease in the MPI and increase in linear inferior deviation from intercuspal position at 3 months (post hoc comparison) as well as a significant increase in the linear posterior and inferior deviation from intercuspal position at 6 months.


CONCLUSIONS
LO is the preferable occlusal scheme for patients with severe RRR.
Matsumaru
Yuichi
Y
Department of Gnatho-Oral Prosthetic Rehabilitation, Nihon University School of Dentistry at Matsudo, 2-870-1 Sakaecho-Nishi, Matsudo, Chiba 271-8587, Japan. matsumaru.yuichi@nihon-u.ac.jp
D000369:Aged, 80 and over; D016301:Alveolar Bone Loss / Q000473:pathology*; D000539:Alveolar Process / Q000473:pathology*; D001732:Bite Force; D003767:Dental Occlusion, Balanced; D003824:Denture, Complete; D005260:Female; D006801:Humans; D008297:Male; D008334:Mandible / Q000502:physiology*; D008409:Mastication / Q000502:physiology*; D008875:Middle Aged