CC BY-NC-ND 4.0 · Eur J Dent 2017; 11(03): 323-329
DOI: 10.4103/ejd.ejd_295_16
Original Article
European Journal of Dentistry

Comparison of the Pendulum appliance and the Jones Jig: A prospective comparative study

Sushruth Shetty
1   Department of Orthodontics, Maaruti Dental College, Bengaluru, Karnataka, India
,
Rajkumar Maurya
2   Department of Orthodontics, ADC (R & R), Delhi, India
,
H. V. Pruthvi Raj
3   Department of Orthodontics, BGS Global Institute of Medical Sciences, Bengaluru, Karnataka, India
,
Anand Patil
4   Department of Orthodontics, SDM College of Dental Sciences and Hospital, Dharwad, Karnataka, India
› Author Affiliations
Further Information

Publication History

Publication Date:
25 September 2019 (online)

ABSTRACT

Objective: To compare two molar distalization devices, the Pendulum appliance (PA) and the Jones Jig (JJ) in dental Class II patients. Materials and Methods: Pretreatment and postdistalization lateral cephalograms and study models of 20 subjects (6 males, 14 females) Class II malocclusion subjects were examined. PA and JJ group both consisted of 10 patients each 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 was corrected to a super Class I molar relationship in both groups. Initial and final measurements and treatment 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 and T2; rate of molar distalization was 1.59 mm/month for PA, and the JJ appliance averaged 0.88 mm/month, distal molar tipping was greater in PA (6.2°) than in the JJ (3.9°). Average mesial movement of the premolars was 2.2 mm with PA and JJ both. JJ showed a greater rotation of first molars after distalization as compared to PA. The increase in vertical facial height was also greater for JJ as compared to PA. Conclusions: Both the appliances were effective in molar distalization with PA requiring less distalization time (16 days less than JJ). Some adverse effects were noted with both which one should strive to control.

 
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