Hearing immaturity found by ABR and its clinical impact on otoneurological evaluation

Effects of missing teeth and nasal septal deviation on maxillary sinus volume: a pilot study

PURPOSE

Tooth extraction and the projection of the tooth roots into the maxillary sinus are reported to greatly reduce the bone height from the alveolar ridge to the maxillary sinus floor, while missing teeth are reported to lead to the expansion of the maxillary sinus, all of which are important considerations during dental implant treatment for the maxillary molar region. Therefore, assessing the anatomical characteristics of the maxillary sinus acting as complicating factors is crucial before sinus augmentation. We conducted a three-dimensional examination of the effects of missing teeth and nasal septal deviation (NSD) on maxillary sinus volume (MSV).

METHODS

We selected participants with two or more missing teeth from patients who underwent maxillary sinus augmentation for a unilateral free-end saddle between April 2019 and December 2020. We calculated the MSV and NSD using cone-beam computed tomography (CBCT). We compared the relationships of the presence/absence of teeth and NSD with MSV bilaterally in each patient using the Wilcoxon t-test. p-values < 0.05 denoted statistical significance.

RESULTS

This study included 30 patients (30 sinuses; 12 men, 18 women). The average patient age was 58.2 ± 10.2 years (men, 60.4 ± 3.7 years; women, 59.2 ± 4.5 years; range, 40-77 years). The mean number of missing teeth was 2.98 ± 1.01: 13 patients had two missing teeth and 17 had three or more missing teeth. Nine patients (30%) had NSD. The mean MSV on the ipsilateral and contralateral sides of the NSD was 21.50 ± 3.84 cm3 and 22.10 ± 3.56 cm3, respectively; thus, NSD did not affect MSV (p = 0.150). The mean MSV on the edentulous and non-edentulous sides was 21.58 ± 3.89 cm3 and 21.77 ± 4.30 cm3, respectively; thus, the MSV was significantly smaller on the edentulous side (p = 0.00036).

CONCLUSION

Although this study was a limited preoperative study, three-dimensional measurement of the maxillary sinus with CBCT in partially edentulous patients revealed that missing teeth lead to substantial reductions in MSV, while NSD was not associated with MSV.

The effect of ectodermal dysplasia on volume and surface area of maxillary sinus

PURPOSE

Ectodermal dysplasia (ED) is a congenital syndrome characterized by abnormal development of ectodermal structures, such as skin, hair, nails, teeth, or salivary glands. Patients with ED demonstrate craniofacial dysmorphology, midfacial hypoplasia and hypodontia. The aim of this study is to evaluate volume and surface area of maxillary sinus and craniofacial structures in patients with ectodermal dysplasia (ED) using cone-beam computed tomography (CBCT) images.

METHODS

The CBCT images of 20 patients with ED (study group) and 20 healthy individuals (control) which are equal in terms of age and gender were evaluated. After a three-dimensional analysis and segmentation of each maxillary sinus, the volume and surface area were calculated. Craniofacial dimensions were measured on the sagittal planes of the CBCT images. The results of the ED and control groups were statistically compared.

RESULTS

The right and left sinus volumes and surface areas were significantly lower in the ED group than in the control group (p < 0.05) while the SNA was significantly higher (p < 0.05). ANB and SN-GoMe were also lower in patients with ED than in controls (p < 0.05). The difference in SNB values between the two groups was not significant (p > 0.05).

CONCLUSIONS

The volumes and surface areas of both maxillary sinuses were found to be smaller in patients with ED compared to healthy individuals. Class III malocclusion with maxillary retrusion is a characteristic craniofacial feature of these patients.