scholarly journals KPG Index versus OPG Measurements: A Comparison between 3D and 2D Methods in Predicting Treatment Duration and Difficulty Level for Patients with Impacted Maxillary Canines

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Domenico Dalessandri ◽  
Marco Migliorati ◽  
Luca Visconti ◽  
Luca Contardo ◽  
Chung How Kau ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Cone Beam Computed Tomography ◽  
Treatment Duration ◽  
Orthodontic Treatment ◽  
Cone Beam ◽  
Occlusal Plane ◽  
Difficulty Level ◽  
Intrarater Reliability ◽  
Impacted Canines ◽  
Tip Position

Aim. The aim of this study was to test the agreement between orthopantomography (OPG) based 2D measurements and the KPG index, a new index based on 3D Cone Beam Computed Tomography (CBCT) images, in predicting orthodontic treatment duration and difficulty level of impacted maxillary canines.Materials and Methods. OPG and CBCT images of 105 impacted canines were independently scored by three orthodontists att0and after 1 month (t1), using the KPG index and the following 2D methods: distance from cusp tip and occlusal plane, cusp tip position in relation to the lateral incisor, and canine inclination. Pearson’s coefficients were used to evaluate the degree of agreement and theχ2with Yates correction test was used to assess the independence between them.Results. Inter- and intrarater reliability were higher with KPG compared to 2D methods. Pearson’s coefficients showed a statistically significant association between all the indexes, while theχ2with Yates correction test resulted in a statistically significant rejection of independency only for one 2D index.Conclusions. 2D indexes for predicting impacted maxillary canines treatment duration and difficulty sometimes are discordant; a 3D index like the KPG index could be useful in solving these conflicts.

Cone-beam computed tomography for routine orthodontic treatment planning: A radiation dose evaluation

2008 ◽  
Vol 133 (5) ◽  
pp. 640.e1-640.e5 ◽  
Author(s):  
Maria Alves Garcia Silva ◽  
Ulrich Wolf ◽  
Frank Heinicke ◽  
Axel Bumann ◽  
Heiko Visser ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Radiation Dose ◽  
Treatment Planning ◽  
Cone Beam Computed Tomography ◽  
Orthodontic Treatment ◽  
Cone Beam ◽  
Dose Evaluation

scholarly journals Reliability of a Novel CBCT-Based 3D Classification System for Maxillary Canine Impactions in Orthodontics: The KPG Index

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Domenico Dalessandri ◽  
Marco Migliorati ◽  
Rachele Rubiano ◽  
Luca Visconti ◽  
Luca Contardo ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Cone Beam Computed Tomography ◽  
Classification System ◽  
Orthodontic Treatment ◽  
Three Dimensional ◽  
Interrater Agreement ◽  
Cone Beam ◽  
Maxillary Canine ◽  
Dental Imaging ◽  
Dimensional Classification

The aim of this study was to evaluate both intra- and interoperator reliability of a radiological three-dimensional classification system (KPG index) for the assessment of degree of difficulty for orthodontic treatment of maxillary canine impactions. Cone beam computed tomography (CBCT) scans of fifty impacted canines, obtained using three different scanners (NewTom, Kodak, and Planmeca), were classified using the KPG index by three independent orthodontists. Measurements were repeated one month later. Based on these two sessions, several recommendations on KPG Index scoring were elaborated. After a joint calibration session, these recommendations were explained to nine orthodontists and the two measurement sessions were repeated. There was a moderate intrarater agreement in the precalibration measurement sessions. After the calibration session, both intra- and interrater agreement were almost perfect. Indexes assessed with Kodak Dental Imaging 3D module software showed a better reliability inz-axis values, whereas indexes assessed with Planmeca Romexis software showed a better reliability inx- andy-axis values. No differences were found between the CBCT scanners used. Taken together, these findings indicate that the application of the instructions elaborated during this study improved KPG index reliability, which was nevertheless variously influenced by the use of different software for images evaluation.

scholarly journals The Relationship between Dental Follicle Width and Maxillary Impacted Canines’ Descriptive and Resorptive Features Using Cone-Beam Computed Tomography

2017 ◽  
Vol 2017 ◽  
pp. 1-5 ◽  
Author(s):  
İlhan Metin Dağsuyu ◽  
Rıdvan Okşayan ◽  
Fatih Kahraman ◽  
Mehmet Aydın ◽  
İbrahim Şevki Bayrakdar ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Cone Beam Computed Tomography ◽  
Root Resorption ◽  
Three Dimensional ◽  
Cone Beam ◽  
Dental Follicle ◽  
Impacted Canines ◽  
Impacted Canine ◽  
The Relationship ◽  
Maxillary Impacted Canine

Objectives. To assess the relationship between dental follicle width and maxillary impacted canines’ descriptive and resorptive features with three-dimensional (3D) cone-beam computed tomography (CBCT). Methods. The study comprised 102 patients with cone-beam computed tomography 3D images and a total of 140 impacted canines. The association between maxillary impacted canine dental follicle width and the variables of gender, impaction side (right and left), localization of impacted canine (buccal, central, and palatal), and resorption of the adjacent laterals was compared. Measurements were analyzed with Student’s t-test, Kruskal-Wallis test, and Mann–Whitney U statistical test. Results. According to gender, no statistically significant differences were found in the follicle size of the maxillary impacted canine between males and females (p>0.05). Widths of the follicles were determined for the right and left impaction sides, and no statistically significant relation was found (p>0.05). There were statistically significant differences between root resorption degrees of lateral incisors and maxillary impacted canine follicle width (p<0.05). Statistically significant higher follicle width values were present in degree 2 (mild) resorption than in degree 1 (no) and degree 3 (moderate) resorption samples (p<0.05). Conclusions. No significant correlation was found between follicle width and the variables of gender, impaction side, and localization of maxillary impacted canines. Our study could not confirm that increased dental follicle width of the maxillary impacted canines exhibited more resorption risk for the adjacent lateral incisors.

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