Correlation of Incisors Inclination and Position with Facial Profile

Abstract

Aims: This study aimed to assess the relationship between upper and lower incisors and soft tissue facial profile. Materials and methods: The sample included forty eight Iraqi adults (22 men, 26 women) with Class I normal occlusion. Seven soft tissue parameters and six skeletal and incisal parameters were measured on lateral cephalometric radiographs. The data were analyzed using independent sample t test and Pearson correlation analysis. Results: sexual dimorphism was reported only for soft tissue convexity angle and interlabial angle. The results also showed correlation between incisor parameters and soft tissue parameters. Lower incisor inclination showed negative correlation with soft tissue profile angle for male and total samples. While both upper and lower incisors positions showed positive correlation with upper lip/NP angle and soft tissue pogonion/NP distance. Positive correlation was noticed between interincisal angle and soft tissue profile convexity angle for the total sample. Conclusions: upper and lower incisors are correlated to the overlying soft tissue structures. This correlation was mostly significant for the upper lip vermilion, upper lip base and tip of the nose.

Hubungan Sudut Interinsisal Dengan Profil Jaringan Lunak Wajah Menurut Analisis Holdaway Pada Mahasiswa FKG Usu Ras Campuran Proto Dan Deutro-Melayu

“…16 Sudut fasial juga sangat dipengaruhi oleh letak titik Pog' karena menunjukkan maju mundurnya dagu terhadap kepala. 3,6 Pernyataan tersebut mendukung hasil penelitian ini yang menyatakan bahwa sudut fasial mempunyai hubungan yang sangat lemah dan tidak bermakna dengan sudut interinsisal.…”

“…Profil wajah pasien biasanya dilihat dari inklinasi gigi anterior dan ortodontis harus mengembalikan posisi insisivus untuk mendapatkan keseimbangan wajah ideal. 6 Menurut penelitian Agha dkk, terdapat korelasi positif antara sudut interinsisal dan sudut konveksitas profil jaringan lunak wajah pada seluruh sampel penelitian. 6 Arigato menyatakan ada korelasi lemah dengan nilai signifikan yang tidak bermakna dan positif antara sudut interinsisal dengan profil jaringan lunak wajah.…”

“…6 Menurut penelitian Agha dkk, terdapat korelasi positif antara sudut interinsisal dan sudut konveksitas profil jaringan lunak wajah pada seluruh sampel penelitian. 6 Arigato menyatakan ada korelasi lemah dengan nilai signifikan yang tidak bermakna dan positif antara sudut interinsisal dengan profil jaringan lunak wajah. 7 Sedangkan menurut Susilowati, tidak ada hubungan yang bermakna antara sudut interinsisal dengan konveksitas jaringan lunak wajah pada laki-laki dan perempuan suku Bugis dan Makassar.…”

Evaluation of Interincisal Angle and Lip Position in Class II Division 1 Malocclusion Treatment with Upper Premolar Extraction

“…Facial profile usually represents the inclination of anterior teeth and the ideal incisive position has to be aligned in order to get a good facial balance after orthodontic treatment, with consideration of soft tissue thickness factor of each individual [3] [4]. Therefore, it is important to measure the relationship between anteroposterior position of incisive and soft tissue.…”

“…Previous studies have suggested that there is a relationship between incisive position and profile convexity and lip position [4]. However, according to Kasai (1998) soft tissue does not always follow dento-skeletal profile because soft tissue covering the teeth and alveolar bone has varying thickness and tension [5].…”