Assessment of mandibular posterior regional landmarks using cone-beam computed tomography in dental implant surgery

Souza, Lílian Azevedo de; Assis, Neuza Maria Souza Picorelli; Ribeiro, Rosângela Almeida; Carvalho, Antônio Carlos Pires; Devito, Karina Lopes

doi:10.1016/j.aanat.2016.01.006

Cited by 28 publications

(59 citation statements)

References 28 publications

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“…56 The submandibular fossa was previously found to increase from the premolar to the molar region, ranging from 0 to 5 mm in depth, 57 which is reflected by PC 1 in our study. The extent of this fossa has been described as highly variable.…”

Section: Discussionsupporting

confidence: 60%

“…The extent of this fossa has been described as highly variable. 57 While we found the submandibular fossa to increase in depth from r4 to r6, the variance of both size and shape decreased from r4 to r6 in the control group (Figure 2). It has been previously shown that cross-sectional dimensions of the mandible are sexually dimorphic; 24 indeed, we also found sexual differences in cross-sectional size and shape that were consistent across regions of interest and agenesis groups.…”

Section: Discussionmentioning

confidence: 70%

“…61, 62, 63 A submandibular fossa depth >2 mm has been identified as a risk factor for lingual cortex perforation during implant placement, 64 putting 10%–18% of patients at risk when installing a 10-mm implant. 57, 65 Penetration of the lingual plate in the submandibular fossa endangers the Nevus mylohyoideus, the A. and V. mylohyoidea, the glandula submandibularis, and the M. mylohyoideus. Because the submandibular fossa depth is often difficult to estimate by clinical examination, from only the alveolar bone width, or by standard two-dimensional imaging, 62, 64 three-dimensional radiographic examination of the posterior mandible is indicated for the treatment planning of agenesis patients.…”

Section: Discussionmentioning

confidence: 99%

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Second premolar agenesis is associated with mandibular form: a geometric morphometric analysis of mandibular cross-sections

Bertl

Wagner

et al. 2016

Int J Oral Sci

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The aim of this study was to compare mandibular form (i.e., size and shape) between patients with agenesis of the lower second premolar (P2) and a control group with no agenesis. Three hypotheses were tested: (H1) agenesis causes a change in mandibular morphology because of inadequate alveolar ridge development in the area of the missing tooth (mandibular plasticity); (H2) agenesis is caused by spatial limitations within the mandible (dental plasticity); and (H3) common genetic/epigenetic factors cause agenesis and affect mandibular form (pleiotropy). A geometric morphometric analysis was applied to cross-sectional images of computed tomography (CT) scans of three matched groups (n=50 each): (1) regularly erupted P2; (2) agenesis of P2 and the primary second molar in situ; and (3) agenesis of P2 and the primary second molar missing for >3 months. Cross-sections of the three areas of interest (first premolar, P2, first molar) were digitized with 23 landmarks and superimposed by a generalized Procrustes analysis. On average, the mandibular cross-sections were narrower and shorter in patients with P2 agenesis compared with that in the control group. Both agenesis groups featured a pronounced submandibular fossa. These differences extended at least one tooth beyond the agenesis-affected region. Taken together with the large interindividual variation that resulted in massively overlapping group distributions, these findings support genetic and/or epigenetic pleiotropy (H3) as the most likely origin of the observed covariation between mandibular form and odontogenesis. Clinically, reduced dimensions and greater variability of mandibular form, as well as a pronounced submandibular fossa, should be expected during the treatment planning of patients with P2 agenesis.

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Section: Discussionsupporting

confidence: 60%

Section: Discussionmentioning

confidence: 70%

Section: Discussionmentioning

confidence: 99%

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Second premolar agenesis is associated with mandibular form: a geometric morphometric analysis of mandibular cross-sections

Bertl

Wagner

et al. 2016

Int J Oral Sci

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“…Lingual concavity is common in posterior mandible, but only small percentages (10%–19%) are influential undercuts and interfere with dental implants. [ 15 16 ] This fact is more important in the second molar region than in the first molar region. [ 17 ]…”

Section: Discussionmentioning

confidence: 99%

Submandibular fossa augmentation in implant dentistry

Rahpeyma

Khajehahmadi

2017

J Indian Soc Periodontol

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Background:There are two limiting factors for determining the dental implant fixture length in mandibular posterior edentulous region: Inferior dental canal and submandibular fossa.Purpose:Submandibular fossa augmentation is a suggested way to overcome the problem of lingual undercut beneath the mylohyoid ridge in implant dentistry.Materials and Methods:Patients with lingual posterior bony undercut that interferes with the placement of a standard implant with a length of 10 mm were enrolled in this study.Results:This method was used for eight patients in 10 sites. Increased implant length and decreasing the chance of sublingual hematoma due to lingual cortical plate perforation are the results of this study.Conclusions:Submandibular fossa augmentation is a new technique to improve the maneuver of oral surgeons to increase dental implant length in the presence of deep lingual bony undercut.

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“…8 With the advent of 3-dimensional sectional imaging modalities such as computed tomography (CT) and cone-beam computed tomography (CBCT), the three-dimensional anatomy of the bone can now be visualized at submillimeter resolution preoperatively. 9,10 These modalities not only help to avoid superimposition and distortion errors but also allow measurements to be made in planes of space not available or accurately depicted in conventional radiographs. 11,12 They can also be used to fabricate surgical guides for accurate and guided implant placement.…”

Section: Introductionmentioning

confidence: 99%

Dental Implant

Sharif

Hussain

Aslam

et al. 2018

TPMJ

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Objectives: To measure the average bone width and bone height in the posterioredentulous spans in the mandible as well as to evaluate bone quality and anterior extensionof the Inferior alveolar nerve to assess possibility for dental implant placement. Study Design:Cross-sectional study. Setting: Armed Forces Institute of Dentistry, Rawalpindi – Pakistan.Period: July 2017 to Oct 2017. Method: Bone height, width and anterior extension of inferioralveolar nerve was assessed using CBCT images from the hospital database. Bone quality wascategorized as hard, moderately hard or soft based on clinician’s tactile sensations. Results:Average bone width of 6.12 ±1.51 mm and average bone height of 13.56 ± 2.43 mm wasfound among the study subjects. “Soft” bone quality was found most prevalent in the posteriormandible. Anterior extension of the Inferior alveolar nerve was visible in 14% of subjects only.Conclusion: Variations in the bone width, height and density endorse the importance of a sitespecificbone tissue evaluation prior to implant installation.

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Assessment of mandibular posterior regional landmarks using cone-beam computed tomography in dental implant surgery

Cited by 28 publications

References 28 publications

Second premolar agenesis is associated with mandibular form: a geometric morphometric analysis of mandibular cross-sections

Second premolar agenesis is associated with mandibular form: a geometric morphometric analysis of mandibular cross-sections

Submandibular fossa augmentation in implant dentistry

Dental Implant

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