انحنای اسپی در دندان‌های دائمی افراد دارای مال‌اکلوژن‌های کلاس I، ‌II و III و ارتباط آن با اورجت و اوربایت

نوع مقاله : مقاله‌های پژوهشی

چکیده

مقدمه: انحنای اسپی در بازسازی‌های کامل دهان، اهمیت زیادی داشته که می‌توان به عنوان یک مرجع برای بازسازی‌های پروتزی و ارتودنسی استفاده کرد. هدف از مطالعه‌ی حاضر، برآورد مقادیر انحنای اسپی در قوس‌های مندیبل و ماگزیلا و تعیین رابطه‌ی آن با اورجت و اوربایت در انواع مال‌اکلوژن‌ها بود.
مواد و روش‌ها: در این مطالعه‌ی توصیفی- مقطعی، ۷۵ جفت کست دندانی با سیستم دندانی دائمی و واجد مولرهای دوم، موجود در کلینیک واحد دندان‌پزشکی دانشگاه آزاد خوراسگان و مطب‌های خصوصی ارتودنسی انتخاب شدند و در سه گروه ۲۵تایی بر اساس مال‌اکلوژن I، II و III تقسیم شدند. برای اندازه‌گیری شعاع انحنای اسپی، نوک کاسپ‌های کانین، مزیوبوکال مولر اول و کاسپ دیستوباکال مولر دوم به شکل یک قوس به هم متصل و برای اندازه‌گیری عمق انحنای اسپی پلن‌رفرنس از کاسپ باکال‌کانین تا کاسپ دیستوباکال مولر دوم متصل شده و خطوط عمود از این خط به لبه‌ی کاسپ پرمولرها، مولرهای اول و کاسپ مزیوبوکال مولر دوم کشیده شد. اورجت به صورت میانگین، ۶ دندان جلویی بالا و اوربایت به صورت میانگین، ۴ دندان جلویی پایین اندازه‌گیری شد. داده‌ها با آزمون‌های آماری ANOVA، Tukey و correlation Pearson تجزیه و تحلیل شدند (0/05 = α).
یافته‌ها: در مال‌اکلوژن کلاس II، مقادیر اوربایت، رابطه‌ی معنی‌داری با شعاع (0/02 = p value) و عمق انحنای اسپی (0/04 =p value ) داشته و در مال‌اکلوژن کلاس III، مقادیر اوربایت رابطه‌‌ی معنی‌داری با عمق انحنای اسپی (0/001 =p value ) داشت. در مال‌اکلوژن کلاس II، انحنای اسپی عمیق‌تر و اوربایت بیشتر بوده و در مال‌اکلوژن کلاس III، رابطه‌‌ی مستقیمی بین مقادیر انحنای اسپی و اوربایت دیده شد.
نتیجه‌گیری: انحنای اسپی، بر مقادیر اورجت و اوربایت تأثیرگذار بوده و وجود اوربایت افزایش‌یافته از یک انحنای اسپی عمیق ناشی می‌گردد.
کلید واژه‌ها: انحنای اسپی، مال‌اکلوژن، اورجت، اوربایت

عنوان مقاله [English]

Assessing the Curve of Spee in Permanent Dentition in Class I, II, III Malocclusions and its Relation with Overjet and Overbite

چکیده [English]

Introduction: The curve of spee is very important in complete oral reconstructions and can be used as a reference for prosthetic and orthodontic reconstructions. This study assessed the curve of spee in the maxilla and mandible and its relationship with the overjet and overbite in class I, II, and III malocclusions in Iranian population. In this descriptive cross- sectional study, 75 pairs of dental casts with permanent dental system and having second molars, available in the clinic of Khorasgan Azad University and private orthodontic offices were selected and divided into three groups of 25 based on malocclusion I, II, and III.
Materials & Methods: In this descriptive cross- sectional study, 75 pairs of dental casts with permanent dental system and having second molars, available in the clinic of Khorasgan Azad University and private orthodontic offices were selected and divided into three groups of 25 based on malocclusion I, II and III. The radius and depth of curve of spee were obtained. radius of the curve of spee, the tip of canine cusps, the mesiobuccal of the first molars, and the distobuccal cusps of the second molars were joined together in the form of an arch. To measure the depth of curve of spee, the reference plan was drawn from buccal canine cusp to distobuccal cusp of the second molars. The perpendicular lines were drawn from this line to the edge of the premolars cusp, the first molar and the second molar mesiobuccal cusp and the deepest part was regarded for the measurements. Overjet was measured as an average of 6 upper anterior teeth and overbite as an average of 4 anterior lower teeth and the values of radius and depth of horseshoe curvature and overbite and overjet values were analyzed by One-way ANOVA and Tukey test and Correlation between data was also examined by Pearson correlation coefficient test (p value = 0.05).
Results: In class II malocclusion, overbite values had a significant relationship with radius (p value = 0.02) and depth of the curve of spee (p value = 0.04), in class III malocclusion, overbite values had a significant relationship with the curve of spee (p value = 0.001) had. In class II malocclusion, the curve of spee was deeper and overbite values were higher, and also in the class III malocclusions, a direct relationship existed between the curve of spee and overbite.
Conclusion: Curve of spee effects the values of overjet and overbite, and the presence of increased overbite results from a deep spee curvature.
Key words: The curve of spee, Malocclusion, Overjet, Overbite.

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