Comparison of the pendulum appliance and the jones jig a prospective comparative study

Abstract

Comparison of the Pendulum appliance and the Jones Jig: Aprospective comparative study Sushruth Shetty , Rajkumar Maurya , H. V. Pruthvi Raj , and Anand Patil Abstract Objective: To compare two molar distalization devices, the Pendulum appliance (PA) and the Jones Jig (JJ) indental Class II patients. Materials and Methods: Pretreatment and postdistalization lateral cephalograms and study models of 20 subjects (6 males, 14females) Class II malocclusion subjects were examined. PA and JJ group both consisted of 10 patientseach with a mean pretreatment age of 12 years 1 month for females and 12 years 5 months for males.The PA and the JJ appliance were activated once in a month until Class II molar relationship wascorrected to a super Class I molar relationship in both groups. Initial and final measurements andtreatment changes were compared by means of Paired t -test. Results: Maxillary first molar distalized an average of 3.85 mm in the PA and 2.75 mm in the JJ between T1 andT2; rate of molar distalization was 1.59 mm/month for PA, and the JJ appliance averaged 0.88mm/month, distal molar tipping was greater in PA (6.2°) than in the JJ (3.9°). Average mesialmovement of the premolars was 2.2 mm with PA and JJ both. JJ showed a greater rotation of firstmolars after distalization as compared to PA. The increase in vertical facial height was also greater forJJ as compared to PA. Conclusions: Both the appliances were effective in molar distalization with PA requiring less distalization time (16days less than JJ). Some adverse effects were noted with both which one should strive to control.