Evaluation of Treatments in Patients with Nocturnal Bruxism on Bite Force and Occlusal Contact Area: A preliminary report Alper Alkana Emel Bulutb Selim Aricic Shuichi Satod Objectives: The purpose of this study was to investigate the short-term effects of occlusal splint therapy and tricyclic antidepressants on the bite force and occlusal contact area of patients presenting with nocturnal bruxism. Methods: A maxillary full-coverage hard acrylic splint was applied to the five patients (Group S). Five patients took a tricyclic antidepressant (Amitriptiline HCl, 10 mg/day) for 3 months (Group A) and a control group (Group C) comprising of 10 dental school students with normal occlusion was also formed. Using a Dental Prescale (Fuji Photo Film Corporation, Tokyo, Japan) and an Occluzer computer (FPD703, Fuji Photo Film Corporation, Tokyo, Japan) the bite force and occlusal contact area were measured. The evaluations were made just before the treatment and at 1 month and 3 months of treatment. Results: The bite force and occlusal contact area before treatment in study Groups A and S were found to be higher than those in the Group C. Furthermore, the bite force and occlusal contact area increased during treatment in Group A whilst they decreased in Group S. Bite force and occlusal contact area in Group S were lower at both 1 month and 3 months of treatment than in Group C. Conclusions: It could be tentatively suggested that occlusal splint therapy may be more effective than tricyclic antidepressant in the treatment of bruxism. Further investigations of this measurement method involving larger study populations and a longer follow-up period are needed. (Eur J Dent 2008;2:276-282) Key words: Antidepressant; Bite force; Bruxism; Occlusal contact area; Splint. a Associate Professor and Chairman, DDS, PhD, Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Erciyes University, Kayseri, Turkey. b Assistant Professor, DDS, PhD, Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Ondokuz Mayis University, Samsun, Turkey. c Professor, DDS, MMedSci, PhD, Department of Orthodonthics, Faculty of Dentistry, Ondokuz Mayis University, Samsun, Turkey. d Lecturer, Division of Maxillofacial Surgery, Graduate School of Dentistry, Tohoku University, Sendai, Japan. Corresponding author: Dr. Emel Bulut Ondokuz Mayis Universitesi, Dis Hekimligi Fakultesi 55139, Kurupelit, Samsun, Turkey. Phone: +90 362 3121919-3008 Fax: +90 362 4576032 E-mail: euzun@omu.edu.tr 276 European Journal of Dentistry