A Comparison of Hand Traced Conventional Lateral Cephalogram with Digital Lateral Cephalogram Using Different Calibration Techniques of Dolphin Imaging (Version 11.5).

Objective:The purpose of the study was to evaluate and compare hand tracings on conventional lateral cephalograms with different calibration techniques available in dolphin imaging on digital lateral cephalogram. Materials and Methods:50 Conventional lateral cephalogram and 50 digital lateral cephalogram were taken in (NHP) at same period of timeon the same patient. Two angular measurements Facial Axis Angle and ANB angle two linear measurements Sella to Nasion and Sella to articulare have been taken. The digital images were traced by calibration 3 techniques Ruler, DPI and Land mark available in Dolphin Imaging Software Version 11.5.The conventional were traced on lead acetate paper and data has been collected.Results: In measurement of Facial Axis Angle conventional when compared with different calibration techniques Ruler Land Mark technique show <0.001significantvalue. In measurement of ANB angle shows no significant values. In measurement of S-N length Ruler compared with DPI has shown significant p value <0.001. DPI compared with conventional shows 0.001. S-AR length has shown significant value p value 0.006, DPI compared with Landmark shows 0.007,Landmark compared with conventional shows 0.003. Conclusion: According to our study conventional when compared with calibration techniques ruler has show only one significant value DPI and land mark has shown two significant values so our study conclude that using ruler is the better option for calibration of digital radiograph. As ruler is more accurate to conventional we compare DPI and Landmark techniques to ruler, landmark shows less variation with ruler so according to our study the second option for calibration of digital radiograph is landmark and last option comes DPI.

Comparison of sagittal and vertical dental changes during first phase of orthodontic treatment with MBT vs ROTH prescription.

Objective: The present study was to evaluate and compare anchorage loss in sagittal, vertical dimension in incisal, molar segments and distal tipping of upper canine after first phase of orthodontic mechanotherapy utilizing MBT and ROTH philosophies. Materials and Methods: Thirty patients with class I dentoalveolar malocclusion requiring extraction of all first premolars were randomly assigned into group I and group II. Set of two lateral cephalograms (T1) and (T2) were obtained with appliance in place and after sufficient leveling and aligning respectively. Linear measurements were recorded on the tracings using Pancherz analysis. A Wilcoxon t-test was use to assess the linear changes. Results: In group I sample, upper and lower incisors retroclined during T1 - T2; by mean (SD) value of 2.267 (1.0032) mm, 2.4 (0.98) mm, respectively. Group II sample showed upper incisor proclination by -0.4 (1.404) and lower incisal retroclination by 0.06 (1.48). Upper and lower molars in group I remained stationary and group II upper and lower molars moved mesially by -1.133 (0.351) and -0.002 (0.005). In group I, upper and lower incisors extruded by -0.867 (0.611) and -0.67 (0.703), respectively, and group II the upper and lower incisors extruded by -0.9 (0.507) and -0.133 (0.639). Upper canine tipped distally during T1 - T2 in group I by -0.33° (2.609) and group II there was a change in distal tip of upper canine by -3° (3.184). Conclusion: Results from this random clinical trial showed that MBT technique effectively addressed perceived inadequacies of ROTH philosophy.

The Effects of Orthopedic Facemask Depending On Vertical Facial Patterns.

The objective of the study is to evaluate treatment effects of orthopedic facemask on Class III preadolescents depending on the vertical facial pattern. This study was based on 30 patients aged 9–12 years, and were diagnosed as skeletal Class III with maxillary deficiency. They were divided into 2 groups (low and high angle groups) depending on gonial angle and the SNMP (GoGn) angle, respectively. Pretreatment and post-treatment lateral cephalograms were used to compare the effects of facemask and the following conclusions were obtained:1) A significantly large amount of backward movement of the point B was observed in patients with a low SNMP angle. Those with a high SNMP angle had significant forward movement at point A. (2) The patients with low gonial angle had the least forward movement at the point A, and those with a high angle had more forward movement. In comparing the horizontal and vertical movement of the point A, the high angle group showed more horizontal movement while the low angle group showed more vertical movement.

Comparative Evaluation of Effectiveness And Efficiency of Two Color Changing Bracket Bonding Adhesives- A Prospective Clinical Study.

Introduction: The aim of the study was to evaluate and compare the clinical performance of two color changing bracket bonding adhesives (Transbond Plus and Grengloo), in terms of bond failure rate, bonding time and time taken by the adhesives to change color. Methods: Eight consecutive patients seeking orthodontic fixed appliance therapy were bonded using Cross arch Split mouth technique, which involves the placement of two varieties of bracket bonding adhesives in diagonally opposite quadrants and cured using a visible light curing unit. The time taken by the adhesive to change color during bonding and the bonding time was noted using a stop watch. The bond failure rates of both the adhesives were evaluated by a thorough follow up of individual case, as and when they reported to the department with a debonded bracket. The data collected were subjected to statistical analysis using Chi square test and student’s t-test. Results: The overall bond failure rate for two color changing adhesives were 7.1 % and 8.6 %,bonding time was 59.1 and 57.4 seconds per tooth and time to change color was 45.9 and 46 seconds. Interpretation & Conclusion: There were no significant differences between the failure rates, bonding time and time taken by both the adhesives to change color showing that both are clinically efficient and effective. Clinically they are preferred over the non color changing bracket bonding adhesives as these materials save clinical chairside time because of their color changing property which helps in easy flash removal while bonding brackets.

The Clinical Relevance of Orthodontic Archwire Properties : A Revuew.

Archwires are the active components of a fixed appliance through which forces are generated and consequently tooth movement is achieved. Recent advances in orthodontic wire alloys have resulted in a varied array of wires that exhibit a wide spectrum of properties. Presently the orthodontist may select from all the available arch wires one that best meets the demands of a particular clinical situation and the efficiency of the operator. The selection of appropriate wire in turn would provide the benefit of optimum and predictable treatment results. The clinician must therefore be conversant with the difference in the mechanical properties and clinical application of this various types of wires