Korean J Orthod.  2008 Feb;38(1):31-40. 10.4041/kjod.2008.38.1.31.

Treatment and posttreatment changes following intrusion of maxillary posterior teeth with miniscrew implants for open bite correction

• Lee HA
• Park YC

• KMID: 1481503
• DOI: http://doi.org/10.4041/kjod.2008.38.1.31

Abstract

OBJECTIVE
This study investigated the skeletal and dentoalveolar changes after intrusion of maxillary posterior teeth using miniscrew implants during the treatment and posttreatment period. METHOD: The subjects consisted of 11 adults (1 male, 10 females) whose open bites were treated by posterior teeth intrusion with miniscrew. The lateral cephalometric x-rays of pre-treatment, post-treatment, and the retention period were evaluated.
RESULTS
The average intrusion of maxillary posterior teeth at the end of the treatment period was 2.22 mm (p < 0.001) and the average extrusion of maxillary posterior teeth at the end of the 17.4 month retention period was 0.23 mm (p = 0.359). The relapse rate was calculated at 10.36%. A decrease in overbite after the 17.4 month retention period was 0.99 mm (p < 0.05). The relapse rate was calculated at 18.10%. The skeletal changes and vertical height change of maxillary posterior teeth during the retention period was statistically insignificant, but there was a significant decrease in overbite (mean 0.99 mm, p < 0.05). The amount of intrusion and the overbite improvement from treatment significantly correlates to the degree of relapse.
CONCLUSIONS
The results indicate that intrusion of the maxillary posterior teeth using miniscrews is an effective, non-surgical treatment modality which can reasonably be used to address adult open bite.

Keyword

Intrusion of maxillary posterior teeth; Open-bite; Miniscrew implant; Stability

MeSH Terms

Adult
Bites and Stings
Humans
Male
Open Bite
Overbite
Recurrence
Retention (Psychology)
Tooth

Figure

• 

  Fig 1 Appliance for intrusion of maxillary molars using miniscrew. A, Miniscrew insertion on buccal and palatal sides (buccal view); B, miniscrew insertion on buccal and palatal sides (palatal view); C, miniscrew insertion on the buccal side only, with a palatal rigid splint for preventing buccal tipping (transverse view); D, miniscrew insertion on the buccal side only, with a palatal rigid splint for preventing buccal tipping (palatal view).

• 

  Fig 2 Cephalometric landmarks and reference planes. S (Sella), N (nasion), Ar (articulare), P (porion), Go (gonion), Me (menton), Gn (gnathion), Po (pogonion), Or (orbitale), ANS (anterior nasal spine), PNS (posterior nasal spine), A (A point), B (B point), U1 (upper incisor tip), U6 (upper molar mesiobuccal cusp tip), L1 (lower incisor tip), L6 (lower molar mesiobuccal cusp tip), Pog' (soft tissue pogonion); SN (SN plane), a line through sella and nasion; FH (FH plane), a line through orbitale and porion; HP (horizontal reference plane), a line through nasion rotated 7° from sella-nasion line; VP (vertical reference plane), a line through sella and perpendicular line to HP; PP (palatal plane), a line through ANS and PNS; MP (mandibular plane), a line through menton and gonion.

• 

  Fig 3 Skeletal angular measurements. a, SN-GoMe; b, S-N-Pog; c, SNA, S-N-A angle; d, SNB, S-N-B angle; e, ANB difference, c-d; f, IMPA, mandibular incisor long axis to Mn. plane; g, FMA, FH-MP.

• 

  Fig 4 Skeletal and dental linear measurements. 1, N-Me, Anterior facial height; 2, VP-Pog, Antero-posterior location of pogonion; 3, U6-PP (mm), perpendicular distance between mesiobuccal cusp of Mx. first molar to palatal plane; 4, U1-PP (mm), perpendicular distance between Mx. incisor edge to palatal plane; 5, OB (mm), distance between incisal edges of maxillary and mandibular central incisors, perpendicular to horizontal reference plane; 6, OJ (mm), distance between incisal edges of maxillary and mandibular central incisors, perpendicular to vertical reference plane.

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