Clinical Evaluation of Efficacy of CIA and CNA Intrusion Arches.
OBJECTIVE
Excessive overbite is one of the most common problems that confront the orthodontist. Deep bite can be due to infraocclusion of posterior teeth, supraocclusion of anterior teeth or a combination of the two. Correction of same can be carried out by extrusion of molars, intrusion of incisors or by a combination of both respectively. Various intrusion arches are recommended for correcting deep bite by true intrusion of anterior teeth, Utility arches, Segmental arch, Connecticut Intrusion Arch (CIA) and Connecticut New Arch (CNA). The purpose of this study was to evaluate clinical efficacy of CIA and CNA intrusion arches.


METHODS
Tracings recorded from pre and post-treatment lateral cephalograms of 25 patients treated by CIA (Group I) and another 25 patients treated by CNA (Group II) intrusion arches in deep bite cases after four months of treatment were analysed and findings were recorded.


METHODS
Paired t-test was used to compare pre and post-treatment changes within Groups I and II and unpaired t-test was used to compare treatment changes between Group I and Group II. A P-value of < 0.05 was set for statistical significance.


RESULTS
Findings of this study demonstrate that an average of 1mm of intrusion takes place with CIA intrusion arch and 1.3mm with CNA intrusion arch in a period of 4 months. Both intrusion arches do not affect the position of molar in vertical or anteroposterior plane.


CONCLUSIONS
Both CIA and CNA intrusion arches are effective in bringing about intrusion of lower incisors.
Senior Lecturer, Department of Orthodontics and Dentofacial Orthopedics, Triveni Institute of Dental Sciences, Hospital and Research Centre , Bilaspur, Chattisgarh, India .
Swati
S
Sharma
Private Practice, Department of Endo & Consevative, Hyderabad, India .
Sambhav
S
Vora
Senior Lecturer, Rama Dental College, Hospital and Research Centre , Kanpur, Uttar Pradesh, India .
Vinisha
V
Pandey
Deep bite; Deep bite correction; Malocclusions