IMPACT OF NYLON INSERTS FOR THE LOCATOR ATTACHMENT ON FUNCTIONAL ADAPTATION FOR MANDIBULAR OVER DENTURE WEARER (ELECTROMYGRAPHIC ANALYSIS)

Abstract

Purpose: This research investigated the effect of two nylon inserts for the locator attachment with different retentive values on oral rehabilitation for the patients wearing mandibular overdenture regarding their muscular activity. Materials and methods: Six complete maxillary and mandibular overdentures were delivered to six healthy male patients. Two implants were installed in the canine region via computerized surgical stent. The mandibular overdentures were retained by locator attachment. Grouping of the study were done according to the used retentive nylon insert of the locator attachment Group 1: All the patients used blue nylon inserts for three months Group 2: the same patients used pink nylon inserts for another three months, with one month rest period interposed between the used blue &pink nylon inserts . The impact of these types of nylon inserts on the activity of masseter & temporalis muscles was investigated via electromygraphic analysis. Results: ANOVA test revealed improvement for all patients in tested muscles activity expressed as EMG records considering amplitude of these muscle during clenching and chewing hard &soft food either for blue or pink nylon inserts with statistical significance between different measuring periods. Paired t-test proved that pink insert provides significant improvement in muscular activity than the blue one at p ≤ 0.05. Conclusion: Depending on the investigation of this study , it be concluded that the retentive system used in the locator attachment has great impact on oral rehabilitation regarding the patients’ muscular activity.