Korean J Orthod.  2008 Aug;38(4):283-298. 10.4041/kjod.2008.38.4.283.

Changes of mandibular dental arch during surgical-orthodontic treatment in skeletal class III malocclusion individuals

• Nam HJ
• Son WS
• Park SB
• Kim SS

• KMID: 2273369
• DOI: http://doi.org/10.4041/kjod.2008.38.4.283

Abstract

OBJECTIVE
The purpose of this study was to investigate changes in the mandibular dental arch from presurgical orthodontic treatment and orthognathic surgery, and to evaluate the relationships between the pretreatment records and changes of mandibular dental arch in skeletal Class III malocclusion individuals. METHODS: Lateral cephalometric radiographs and mandibular study models of 31 adults with skeletal class III malocclusion were taken and measured. All measurements were evaluated statistically by ANOVA, Scheffe's Post Hoc, and paired t-test, and correlation coefficients were evaluated. RESULTS: No significant difference in Mn-LMMC, Mn-LIE, Mn-MnOcc was detected between pretreatment and presurgical groups. Statistically significant but low correlations were demonstrated between the initial arch length discrepancy (ALD) and change in ICW, IPW1 (r = 0.492, 0.615) and change in arch length (r = 0.641). No association was seen between the initial depth of curve of Spee and change in mandibular incisor angle and arch width or arch length. Regression analysis showed that the amount of change for arch length and IPW1 could be explained by 64.0% and 75.8% of the pretreatment variables respectively. CONCLUSIONS: This study suggests that orthognathic surgery results can be predictable by measuring the pretreatment records.

Keyword

Class III surgical-orthodontics; Dental decompensation; Lower dental arch

MeSH Terms

Adult
Dental Arch
Humans
Incisor
Malocclusion
Orthognathic Surgery

Figure

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  Fig 1. Landmarks of lateral cephalometric films. 1, S (sella); 2, Na (nasion); 3, Or (orbitale); 4, Po (porion); 5, A (point A); 6, B (point B); 7, Me (menton); 8, Go (gonion); 9, LIE (lower incisor edge); 10, LIRA (lower incisor root apex); 11, LMMC (lower molar mesio-buccal cusp).

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  Fig 2. Angular measurement of lateral cephalometric films. 1, SNA (SN plane to NA plane); 2, SNB (SN plane to NB plane); 3, ANB (NA plane to NB plane); 4, SN-Mn (SN plane to mandibular plane); 5, FH-Mn (FH plane to mandibular plane); 6, IMPA (lower incisor to mandibular plane); 7, FH-LI (FH plane to lower incisor); 8, SN-MnOcc (SN plane to mandibular occlusal plane); 9, Mn-MnOcc (mandibular plane to mandibular occlusal plane).

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  Fig 3. Linear measurement of lateral cephalometric films. 1, AFH (anterior facial height); 2, PFH (posterior facial height); 3, Mn-LMMC (vertical distance between mandibular plane to lower molar mesio-buccal cusp); 4, Mn-LIE (vertical distance between mandibular plane to lower incisal edge).

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  Fig 4. Measurement of curve of Spee. A, Dental surveyor to allow measurement of angulation and inclination of each tooth and curve of Spee. B, surgical-orthodontic model calipers to measure curve of Spee.

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  Fig 5. Set-up model gauge.

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  Fig 6. Comparison of cephalometric measurements. Pretx, pretreatment; presurg, presurgical; postsurg, postsurgical.

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  Fig 7. Mean difference between before and after treatment in arch width and arch length.

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  Fig 8. (A) Difference in angulation between before and after treatment. Positive angulation values indicate distal tipping of clinical crown; negative values, mesial tipping. (B) Difference in inclination between before and after treatment. Positive inclination values indicate lingual tipping of clinical crown; negative values, labial tipping.

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