ASSOCIATION BETWEEN MAXILLARY POSTERIOR SEGMENT DISCREPANCY AND THE ANGULATION OF MAXILLARY MOLARS IN PATIENTS WITH DIFFERENT VERTICAL GROWTH PATTERNS

Durr e Shahwar Malik, Mubassar Fida

Abstract


Background: The impaction of maxillary third molars causes the crowns of maxillary first and second molars to tip distally in patients with maxillary posterior segment discrepancy. The aim of this study was to compare the maxillary first and second molar angulations in patients with maxillary posterior segment discrepancy (MPSD) with non-maxillary posterior segment discrepancy (N-MPSD) and evaluate the effect of their angulations on various divergence patterns. Methods: A cross-sectional study was conducted using the pre-treatment lateral cephalograms of 180 subjects which were divided into two groups, i.e., MPSD and N-MPSD. The Mann-Whitney U test was applied to compare various skeletal and dental parameters between the two groups and a pairwise comparison was made among the vertical growth patterns. The Kruskal Wallis test was used to compare the mean molar angulations and overbite among the three divergence patterns. Results: The ratio of anterior to total palatal plane (p≤0.001) and the molar angulation (p≤0.001) showed significant differences between the MPSD and N-MPSD groups. In the MPSD group, significant differences were found between the overbite in the normo-divergent versus hyperdivergent (p≤0.001) and hypodivergent versus hyperdivergent groups (p≤0.001), and in the angulation of the first maxillary molars in the normo-divergent versus hyperdivergent groups (p≤0.001). Conclusions: MPSD causes reduced maxillary first and second molar angulations. A ratio of the anterior palatal plane to total palatal plane length of ≥0.51 was seen in patients with impacted maxillary third molars.

Keywords: Third Molar, Impacted Tooth, Open Bite, Cephalometry

Full Text:

PDF

References


Bishara SE, Burkey PS, Kharouf JG. Dental and facial asymmetries: A review. Angle Orthod 1994;64(2):89–98.

Carlson DS. Theories of craniofacial growth in the postgenomic era. Semin Orthod 2005;11(4):172–83.

Enlow DH, Moyers RE, Hunter WS, McNamara JA Jr. A procedure for the analysis of intrinsic facial form and growth: an equivalent-balance concept. Am J Orthod 1969;56(1):6–23.

Enlow DH, Kuroda T, Lewis AB. The morphological and morphogenetic basis for craniofacial form and pattern. Angle Orthod 1971;41(3):161–88.

Franklin S, Rossouw PE, Woodside DG, Boley JC. Searching for predictors of long-term stability. Semin Orthod 2013;19(4):279–92.

Maia FA, Janson G, Barros SE, Maia NG, Chiqueto K, Nakamura AY. Long-term stability of surgical-orthodontic open-bite correction. Am J Orthod Dentofacial Orthop 2010;138(3):254–61.

Nanda SK. Patterns of vertical growth in the face. Am J Orthod Dentofacial Orthop 1988;93(2):103–16.

Ceylan İ, Eröz ÜB. The effects of overbite on the maxillary and mandibular morphology. Angle Orthod 2001;71(2):110–5.

Beckmann SH, Kuitert RB, Prahl-Andersen B, Segner D, The RP, Tuinzing DB. Alveolar and skeletal dimensions associated with overbite. Am J Orthod Dentofacial Orthop 1998;113(4):443–52.

Isaacson JR, Isaacson RJ, Speidel TM, Worms FW. Extreme variation in skeletal facial growth and associated variation in skeletal and dental relations. Angle Orthod 1971;41(3):219–29.

Opdebeeck H, Bell WH. The short face syndrome. Am J Orthod Dentofacial Orthop 1978;73(5):499–511.

Buschang PH, Jacob H, Carrillo R. The morphological characteristics, growth, and etiology of the hyperdivergent phenotype. Semin Orthod 2013;19(4):212–22.

Petrović Đ, Vukić-Ćulafić B, Ivić S, Đurić M, Milekić B. Study of risk factors associated with the development of malocclusion. Vojnosanit Pregl 2013;70(9):817–23.

Beckmann SH, Kuitert RB, Prahl-Andersen B, Segner D, The RP, Tuinzing DB. Alveolar and skeletal dimensions associated with lower face height. Am J Orthod Dentofacial Orthop 1998;113(5):498–506.

Janson GR, Metaxas A, Woodside DG. Variation in maxillary and mandibular molar and incisor vertical dimension in 12-year-old subjects with excess, normal, and short lower anterior face height. Am J Orthod Dentofacial Orthop 1994;106(4):409–18.

Su H, Han B, Li S, Na B, Ma W, Xu TM. Compensation trends of the angulation of first molars: retrospective study of 1403 malocclusion cases. Int J Oral Sci 2014;6(3):175–81.

Janson G, Laranjeira V, Rizzo M, Garib D. Posterior tooth angulations in patients with anterior open bite and normal occlusion. Am J Orthod Dentofacial Orthop 2016;150(1):71–7.

Forsberg CM. Tooth size, spacing, and crowding in relation to eruption or impaction of third molars. Am J Orthod Dentofacial Orthop 1988;94(1):57–62.

Arriola-Guillén LE, Aliaga-Del Castillo A, Flores-Mir C. Influence of maxillary posterior dentoalveolar discrepancy on angulation of maxillary molars in individuals with skeletal open bite. Prog Orthod 2016;17(1):34–42.

Arriola-Guillén LE, Aliaga-Del Castillo A, Pérez-Vargas LF, Flores-Mir C. Influence of maxillary posterior discrepancy on upper molar vertical position and facial vertical dimensions in subjects with or without skeletal open bite. Eur J Orthod 2016;38(3):251–8.

Fayad JB, Levy JC, Yazbeck C, Cavezian R, Cabanis EA. Eruption of third molars: relationship to inclination of adjacent molars. Am J Orthod Dentofacial Orthop 2004;125(2):200–2.

Schudy FF. The rotation of the mandible resulting from growth: its implications in orthodontic treatment. Angle Orthod 1965;35:36–50.

Schudy FF. The control of vertical overbite in clinical orthodontics. Angle Orthod 1968;38(1):19–39.

Celar AG, Freudenthaler JW, Celar RM, Jonke E, Schneider B. The denture frame analysis: an additional diagnostic tool. Eur J Orthod 1998;20(5):579–87.

Sato S. Alteration of occlusal plane due to posterior discrepancy related to development of malocclusion-introduction to denture frame analysis. Bull Kanagawa Dent Coll 1987;15:115–23.

Liao CH, Yang P, Zhao ZH, Zhao MY. Study on the posterior teeth mesiodistal tipping degree of normal occlusion subjects among different facial growth patterns. Hua Xi Kou Qiang Yi Xue Za Zhi 2010;28(4):374–7.


Refbacks

  • There are currently no refbacks.


Contact Number: +92-992-382571

email: [jamc] [@] [ayubmed.edu.pk]