Buccolingual Inclination of Canine and First and Second Molar Teeth and the Curve of Wilson in Different Sagittal Skeletal Patterns of Adults Using Cone-Beam Computed Tomography
Amin Golshah, Navid Rezaei, Sara Heshmati
Abstract
Objectives. This study aimed to assess the buccolingual inclination of canine and first and second molar teeth and the curve of Wilson in different sagittal skeletal patterns in untreated adults using cone-beam computed tomography (CBCT). Materials and Methods. Sixty-six CBCT scans of adults (mean age: 28.74 ± 5.25 years) were evaluated in this cross-sectional study. The images were standardized using the Frankfurt horizontal plane and the interorbital line. The sagittal skeletal pattern was determined using the ANB angle and Wits appraisal. Inclination angles were measured by NNT Viewer and Mimics software. The curve of Wilson was measured by connecting the tips of mesiobuccal and mesiolingual cusps of maxillary first and second molars along the buccal groove and measuring the formed angle. Data were analyzed using ANOVA. Results. The intraobserver agreement was 0.969. The mean inclination of maxillary first and second molars in class I and III patients was significantly higher than that in class II patients <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" id="M1"> <a:mfenced open="(" close=")" separators="|"> <a:mrow> <a:mi>P</a:mi> <a:mo><</a:mo> <a:mn>0.05</a:mn> </a:mrow> </a:mfenced> </a:math> . The mean inclination of mandibular first and second molars in class II patients was significantly higher than that in class I and III patients <f:math xmlns:f="http://www.w3.org/1998/Math/MathML" id="M2"> <f:mfenced open="(" close=")" separators="|"> <f:mrow> <f:mi>P</f:mi> <f:mo><</f:mo> <f:mn>0.05</f:mn> </f:mrow> </f:mfenced> </f:math> . The difference in inclination of maxillary and mandibular canine teeth was not significant <k:math xmlns:k="http://www.w3.org/1998/Math/MathML" id="M3"> <k:mfenced open="(" close=")" separators="|"> <k:mrow> <k:mi>P</k:mi> <k:mo>></k:mo> <k:mn>0.05</k:mn> </k:mrow> </k:mfenced> </k:math> . The mean curve of Wilson in second molars of class II patients was significantly higher than that in class I patients <p:math xmlns:p="http://www.w3.org/1998/Math/MathML" id="M4"> <p:mfenced open="(" close=")" separators="|"> <p:mrow> <p:mi>P</p:mi> <p:mo><</p:mo> <p:mn>0.05</p:mn> </p:mrow> </p:mfenced> </p:math> . Conclusion. In different sagittal skeletal patterns, a compensatory relationship exists between the opposing teeth, which, along with the standards of crowns, can be used to determine the appropriate position of teeth in dental arch.