A retrospective study of advancement genioplasty

Park, Hyung Sik; Ellis, Edward; Fonseca, Raymond J.; Reynolds, Steven T.; Mayo, Kathleen H.

doi:10.1016/0030-4220(89)90261-2

Cited by 68 publications

(28 citation statements)

References 12 publications

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“…Our results both confirm and extend the earlier report by Martinez that showed better healing in patients younger than age 15 7 and support other findings 6,[14][15][16][17][18]21 that after genioplasty, bone remodeling occurs at the inferior border of the proximal segment between the distal point of the osteotomy cut and the advanced distal segment. Our groups 1 and 2 showed a statistically significant mean reduction of this notch (1.2 6 1.3 mm and 0.6 6 0.9 mm, respectively), while the adult group had a modest nonsignificant reduction of 0.3 6 1.0 mm.…”

Section: Discussionsupporting

confidence: 92%

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Functional genioplasty in growing patients

Chamberland¹,

Chamberland

2014

The Angle Orthodontist

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Objective: To evaluate the role of age as a moderator of bone regeneration patterns and symphysis remodeling after genioplasty. Method: Fifty-four patients who underwent genioplasty at the end of their orthodontic treatment were divided into three age groups: younger than 15 years at the time of surgery (group 1), 15 to 19 years (group 2), and 20 years or older (group 3). Twenty-three patients who did not accept genioplasty and had a follow-up radiograph 2 years after the end of their orthodontic treatment were used as a control group. Patients were evaluated at three time points: immediate preoperative (T1), immediate postoperative (T2,) and 2 years postsurgery (T3). Results: The mean genial advancement at surgery was similar for the three age groups, but the extent of remodeling around the repositioned chin was greater in group 1, less in group 2, and still less in group 3. Symphysis thickness increased significantly during the 2-year postsurgery interval for the three groups, and this increase was significantly greater in group 1 than in group 3. Remodeling above and behind the repositioned chin also was greater in the younger patients. This was related to greater vertical growth of the dentoalveolar process in the younger patients. There was no evidence of a deleterious effect on mandibular growth. Conclusion: The outcomes of forward-upward genioplasty include increased symphysis thickness, bone apposition above B point, and remodeling at the inferior border. When indications for this type of genioplasty are recognized, early surgical correction (before age 15) produces a better outcome in terms of bone remodeling. (Angle Orthod. 2015;85:360-373.)

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Section: Discussionsupporting

confidence: 92%

“…Following genioplasty, as in Park et al, 18 Shaughnessy et al, 19 and Precious et al, 11,17 we found that bone apposition occurred at B point, with a similar change in all three age groups (0.7 to 1.0 mm). Bony angles above the repositioned chin became rounded, and rough edges became smooth.…”

Section: Discussionsupporting

confidence: 79%

Functional genioplasty in growing patients

Chamberland¹,

Chamberland

2014

The Angle Orthodontist

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“…This study indicates a mathematical correlation between Choosing an arbitrary osteotomy slope makes the genioplasty procedure unpredictable and can lead to discrepancies between the planned and the final results [10]. In cases in which large chin advancements (more than 10 mm) are planned, the vertical changes become significant and thus they should not be neglected during prediction.…”

Section: Discussionmentioning

confidence: 89%

“…The more parallel with the occlusal plane and the mandibular plane, the more pure the AP movement. If vertical shortening is desired, the angle of the osteotomy should become more acute compared with the mandibular plane [10].…”

Section: Discussionmentioning

confidence: 99%

A Study on the Influence of the Osteotomy Slope on Bony Changes after Advancement Genioplasty

Chandran

Muthusekhar

Subramanian

et al. 2014

J. Maxillofac. Oral Surg.

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Introduction The slope of the osteotomy used for the genioplasty dictates the vertical change. The horizontal bony changes after advancement genioplasty are not identical to the intercortical bony changes, because the variety of osteotomy slopes result in different vertical changes. Material and Methodology Ten of these patients had additional osteotomies as follows: five maxillary, three mandibular and two both maxillary and mandibular. Preoperative and post-operative (at least 6 months) lateral cephalograms were retrospectively analyzed to assess horizontal and vertical movements of the chin. The following landmarks were used, Hard tissue pogonion (Pog), Occlusal plane (OPL), Menton (Me), Menton plane (MePL). The following parameters were calculated: DH = H-H, DV = V-V, The ratio between DH and DV equals tangent a, Calculated a = inverse tangent a. Results The Mean Horizontal bony movements was 3.75 mm (SD 1.4 mm, range -6 to 15 mm). The Mean Vertical bony movements was 1.4 mm (SD 0.8 mm, range 0.5-2 mm). The Mean Measured Osteotomy slope angle was 82.2 (SD 7.4, range 75-91). The Calculated Mean Slope Angle based on the DH/DV ratio was 82.3 (SD 7.0, range 74-95).Discussion The slope of the osteotomy used for the genioplasty dictates the vertical change. The osteotomy slope angle was defined as the angle between the osteotomy and a line perpendicular to the occlusal plane. The measured angle was compared with the calculated angle deduced from the horizontal and vertical genial post-operative changes.

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“…Através da utilização de fios de aço, o posicionamento correto do mento pode ser comprometido principalmente nos casos de segmentação para obtenção de aumentos transversais 4,13,14 . No entanto, estudos retrospectivos que avaliaram a estabilidade, reabsorção e movimento dos tecidos moles pós-operatórios em um grupo de pacientes submetidos a mentoplastias , fixados com fio de aço e fixação rígida, concluíram que não houve diferença de estabilidade pós operatória entre os dois grupos e que as alterações observadas foram devido ao padrão de remodelação [13][14][15][16][17][18] . O presente estudo teve como objetivo realizar uma análise retrospectiva de pacientes submetidos à mentoplastia para avanço, associadas ou não a outras osteotomias, comparando a estabilidade esquelética de casos fixados com parafusos posicionais com aqueles com fios de aço.…”

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