CDDP-induced desmoplasia-like changes in oral cancer tissues are related to SASP-related factors induced by the senescence of cancer cells.

The tumor microenvironment (TME) concept has been proposed and is currently being actively studied. The development of extracellular matrix (ECM) in the TME is known as desmoplasia and is observed in many solid tumors. It has also been strongly associated with poor prognosis and resistance to drug therapy. Recently, cellular senescence has gained attention as an effect of drug therapy on cancer cells. Cellular senescence is a phenomenon wherein proliferating cells become resistant to growth-promoting stimuli, secrete the SASP (senescence-associated phenotypic) factors, and stably arrest the cell cycle. These proteins are rich in pro-inflammatory factors, such as interleukin (IL)-6, IL-8, C-X-C motif chemokine ligand 1, C-C motif chemokine ligand (CCL)2, CCL5, and matrix metalloproteinase 3. This study aimed to investigate the desmoplasia-like changes in the TME before and after cancer drug therapy in oral squamous cell carcinomas, evaluate the effect of anticancer drugs on the TME, and the potential involvement of cancer cell senescence. Using a syngeneic oral cancer transplant mouse model, we confirmed that cis-diamminedichloroplatinum (II) (CDDP) administration caused desmoplasia-like changes in cancer tissues. Furthermore, CDDP treatment-induced senescence in tumor-bearing mouse tumor tissues and cultured cancer cells. These results suggest CDDP administration-induced desmoplasia-like structural changes in the TME are related to cellular senescence. Our findings suggest that the administration of anticancer drugs alters the TME of oral cancer cells. Additionally, oral cancer cells undergo senescence, which may influence the TME through the production of SASP factors.

Recurrent cementoblastoma with multifocal growth and cellular atypia: a case report.

BACKGROUND: Cementoblastoma is a rare odontogenic tumor characterized by the formation of osteocementum-like tissue on a tooth root directly by neoplastic cementoblasts. Although it is categorized as benign, it has a high potential for growth with a certain degree of recurrence risk. However, there are only a few studies describing the features of recurrent cementoblastoma. The diagnosis of recurrent cementoblastoma is challenging not only due to its cytological atypia but also because of its large size and multicentric growth pattern. These characteristics suggest a potential for malignancy. CASE PRESENTATION: A 29-year-old woman was transferred to our university dental hospital complaining of swelling of the right mandible. She had a history of enucleation of cementoblastoma associated with the third molar of the right mandible. Five years after the initial treatment, imaging demonstrated well-circumscribed multicentric radiopaque lesions in the same area. Histologically, the lesion consisted of osteocementum-like tissue rimmed with polygonal or plump tumor cells. Several cells were large epithelioid cells with bizarre nucleoli, which may be reminiscent of malignant tumors. Otherwise, there were no apparent malignant findings, including proliferative activity or atypical mitotic figure. Besides, tumor cells were positive for c-FOS, a marker of osteoblastoma and cementoblastoma. Eventually, the patient was diagnosed with recurrent cementoblastoma. CONCLUSIONS: Pathological analyses of this case suggested that the recurrent event in the cementoblastoma altered its growth pattern and tumor cell shape. Moreover, in the case of enucleation surgery, long-term follow-up is important because there is some recurrent risk of cementoblastoma, although it is not high.

Multivariate Analysis of Adverse Reactions and Recipient Profiles in COVID-19 Booster Vaccinations: A Prospective Cohort Study.

BACKGROUND: This study investigated the impact of vaccinated population profiles, vaccine type/interval, and the number of vaccine doses on adverse reactions to receiving a coronavirus disease 2019 (COVID-19) booster vaccination. METHODS: A survey of adverse reactions was conducted from January 2022 to December 2022 among Osaka University Dental Hospital employees who received their third or fourth doses. The study included 194 third-dose recipients and 131 fourth-dose recipients. Comparisons of the occurrence of adverse reactions between the third- and fourth-dose groups were analyzed via a chi-squared test. The relationships between each adverse reaction occurrence and recipient profiles, vaccine type/interval, and the number of vaccine doses were analyzed via a logistic regression analysis. RESULTS: No significant differences were found in the occurrence of adverse reactions between the third and fourth doses. Younger recipients often developed injection site reaction, fatigue, chills, fever, arthralgia, headache, diarrhea, and any adverse reactions more often. Females had higher frequencies of fatigue, chills, headache, and nausea compared to males. Recipients without underlying diseases had higher frequencies of fever and nausea than those with underlying diseases. CONCLUSIONS: Younger recipients and females were at higher risk for adverse reactions to a COVID-19 booster vaccination, while the number of vaccinations, vaccination interval, vaccine type, and cross-vaccination showed no significant associations.

Effective oral function improvement by restoration-driven implant treatment after mandibular resection with a scapular flap: a case report.

BACKGROUND: The extensive loss of teeth and surrounding tissues due to mandibulectomy for an oral tumor not only impacts negatively on appearance, but also often causes various functional disorders, decreasing quality of life (QOL). In the present case, reconstruction with a scapular flap was carried out along with segmental mandibulectomy, aiming for functional restoration through restoration-driven implant treatment. A good outcome was obtained, with improvement of masticatory function and QOL following the prosthetic treatment. CASE PRESENTATION: The patient was a 37-year-old woman diagnosed with ossifying fibroma in the left side of the mandible. Segmental mandibulectomy and reconstruction with a scapular flap were carried out. Implant diagnostic simulation was performed, and based on the result, secondary reconstruction using a particulate cancellous bone and marrow graft was carried out by an oral surgeon. After wound healing was complete, implant placement was performed twice, and the final prosthodontic treatment was completed. Masticatory performance and maximum bite force, which are indices of masticatory function, were improved from before to after prosthetic treatment. In addition, oral health-related QOL was improved from before to after prosthetic treatment. CONCLUSION: In the present case, restoration-driven implant treatment was performed in a patient following segmental mandibulectomy for a mandibular tumor, with a good outcome. Planning the treatment measures with a focus on the final prosthetic vision can lead to improvement of oral function in patients with extensive mandibular defects.

GATA6 regulates expression of annexin A10 (ANXA10) associated with epithelial-mesenchymal transition of oral squamous cell carcinoma.

Oral squamous cell carcinoma (OSCC) can disturb oral function and quality of life and is associated with poor survival, likely due to the development of cervical lymph node metastases. Epithelial-mesenchymal transition (EMT) is a process in which cells acquire molecular alterations that facilitate cell motility and invasion, and has been associated with tumor metastasis. EMT changes also play important roles in the induction of lymph node metastasis in OSCC. GATA6 is known as the earliest marker of the primitive endoderm lineages. GATA6 inhibits de-differentiation and EMT in human pancreatic ductal adenocarcinoma cells and promotes EMT. However, in OSCC, the expression and function of GATA6 in EMT and lymph node metastasis remains unclear. Therefore, this study aimed to clarify the targets of GATA6 in OSCC cells and whether the change in GATA6 expression affects EMT in OSCC cells, as well as the association between GATA6 and lymph node metastasis. The results showed that GATA6 knockdown OSCC cells promoted EMT and increased lymph node metastasis compared with control cells, whereas the overexpression of GATA6 inhibited the induction of EMT and reduced lymph node metastasis. In addition, annexin A10 (ANXA10) which is the largest type of Ca2+-regulated phospholipid-binding protein in eukaryotic cells was detected as a target gene for GATA6 and ANXA10 suppressed Vimentin expression in EMT in OSCC. Therefore, the GATA6/ANXA10 cascade may be a potential therapeutic approach for the treatment of lymph node metastases in OSCC patients.

Young Age, Female Sex, and No Comorbidities Are Risk Factors for Adverse Reactions after the Third Dose of BNT162b2 COVID-19 Vaccine against SARS-CoV-2: A Prospective Cohort Study in Japan.

BACKGROUND: This study compared the adverse events (AEs) of the second and third doses of BNT162b2, as well as investigated the impact of vaccine recipients' background and vaccination interval on the AEs of the third dose. METHODS: We conducted a questionnaire survey of AEs among health care workers at Osaka University Dental Hospital. Chi-square tests were performed to compare AEs to the administration of second and third vaccine doses. Logistic regression analyses were conducted to identify factors influencing the presence of AEs using age, sex, comorbidities, and the vaccination interval. Spearman's rank correlation coefficient was calculated to investigate the correlation between age, vaccination interval, and severity of each AE. RESULTS: The third dose of BNT162b2 was associated with significantly more frequent or milder AEs than the second dose. Logistic regression analyses detected significant differences in six items of AEs by age, three by sex, two by comorbidities, and zero by vaccination interval. Consistently, the risk of AEs was greater among younger persons, females, and those without comorbidities. Significant negative correlations were detected between age and vaccination interval, and between age and the severity of most AEs. CONCLUSIONS: Young, female, and having no comorbidities are risk factors for AEs after the third dose of BNT162b2, while vaccination interval is not.

Tumor-infiltrating ICOS+ Effector Regulatory T-Cells in Oral Squamous Cell Carcinoma as a Promising Biomarker for Prognosis and 'Hot' Tumor.

BACKGROUND: Tumor immunity in the tumor microenvironment is activated in patients with feasible clinical responses to immune checkpoint inhibitors. The immunological profile of tumor-infiltrating lymphocytes (TILs) obtained from patients with oral squamous cell carcinoma (OSCC) was examined in relation to their prognosis. MATERIALS AND METHODS: Surface antigens, including immune checkpoint molecules, on TILs from 31 patients with primary OSCC were analyzed by flow cytometry. The activation status of TILs was examined through a heatmap analysis and unsupervised clustering classified patients into groups with activated or inactivated TILs. A supervised machine-learning algorithm for single-cell analyses in relation to prognosis was run using the Cluster Identification, Characterization, and Regression (CITRUS) program. RESULTS: None of surface antigens were related to prognosis. The CITRUS program revealed a relationship between CD45RA-CD4+ CD25high inducible T-cell co-stimulator (ICOS)+ TILs and recurrence, and also identified a similar fraction significantly specific to the group with activated TILs. The disease-free survival rate for patients with ≥95% ICOS+ TILs was significantly lower than that for those with <95% ICOS+ TILs. Furthermore, a review of clinicopathological factors related to prognosis identified the percentage of ICOS+ TILs to be an independent prognostic factor for patients with OSCC. CONCLUSION: CD25highICOS+ regulatory T-cells in TILs have potential as a biomarker for predicting recurrence after surgical treatment and clinical responses to immune checkpoint inhibitors in patients with OSCC.

Impact of age, sex and medical history on adverse reactions to the first and second dose of BNT162b2 mRNA COVID-19 vaccine in Japan: a cross-sectional study.

BACKGROUND: Vaccines for coronavirus disease 2019 (COVID-19) caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) are being promoted worldwide. In this study, we analyzed the relationship between adverse reactions and the profile of vaccinated recipients. METHODS: Vaccinated subjects who received two doses of BNT162b2 between May 17 and June 11, 2021, at Osaka University Dental Hospital were included in this study. Adverse reactions and profiles were collected by questionnaires, and the relationship between the presence of adverse reactions and the profiles of the vaccinated persons was analyzed by logistic regression analysis. The correlation between the severity of adverse reactions and age was analyzed by Spearman's rank correlation. RESULTS: Logistic regression analysis showed that, for many kinds of adverse reactions, the incidence was significantly higher in females than in males and in younger than in older people. There was a very weak but significant negative correlation between age and the severity of many kinds of adverse reactions. The relationship between sex and the incidence of each adverse reaction was significant for injection site reactions and fatigue in the first vaccination, whereas significant relationships were found for fatigue, chills, fever, arthralgia, myalgia and headache in the second vaccination, all of which were clearly more likely to occur in females. CONCLUSION: Adverse reactions to BNT162b2 were found to be more frequent and more intense in females and younger people in Japan, especially after the second vaccination.

Comparison of recurrence rate and speech outcome between two different techniques for cleft palatal fistula closure: A retrospective cohort study.

The aim of this retrospective cohort study was to compare the recurrence rate and speech outcomes between two techniques for palatal fistula closure of cleft palate (CP). Patients with CP who underwent secondary palatal fistula closure using the single hinge-flap method with double-breasted mattress suture (hinge-flap group) and those who were treated with the conventional sliding palatal flap method (sliding-flap group) were retrospectively evaluated for demographic and perioperative variables. Recurrence rate of palatal fistula, perceptual speech outcomes, and nasalance scores were further reviewed in patients who met the inclusion criteria. A total of 31 patients, 21 in the hinge-flap group and 10 in the sliding-flap group, were included in this study. The fistula recurrence rate in the hinge-flap group (0%) was significantly lower than that in the sliding-flap group (30.0%) (P = 0.027). In the speech assessment, hypernasality and nasalance scores decreased post-operatively in both groups and significance was observed in the hinge-flap group (P = 0.013, P < 0.001, respectively). Articulation disorders were significantly improved in the hinge-flap group (P = 0.001). Within the limitations of the study it seems that the single hinge-flap method with double-breasted mattress suture should be preferred whenever appropriate.

Clear Cell Carcinoma in the Oral Cavity with Three Novel Types of EWSR1-ATF1 Translocation: A Case Report.

Clear cell carcinoma (CCC) is a rare epithelial malignant tumor of the salivary glands. It is characterized by tumor cells with clear cytoplasm, hyalinized stroma, and most importantly the fusion genes EWSR1-ATF1, EWSR1-CREM, and EWSR1-PLAG1. Break-apart FISH has been performed for multiple CCC cases, but direct sequencing analysis has been performed in relatively few. Herein, we report an interesting case of CCC harboring three EWSR1-ATF1 translocations: EWSR1 exon 8-ATF1 exon 4, EWSR1 exon 7-ATF1 exon 4, and EWSR1 exon 7-ATF1 exon 5. This case indicates the possibility of independent EWSR1-ATF1 gene translocations, and could provide insight into CCC tumorgenesis.

Lateral Approach With a Mouth Corner Incision for the Molar Part of Mandibulectomy.

OBJECTIVES: The aim of the present study was to evaluate the functional and esthetic results of marginal mandibulectomy for mandibular cancer using a lateral approach with a simple, straightforward mouth corner incision. STUDY DESIGN: Six mandibular cancer patients (2 men, 4 women; age range: 65-80 years; mean age, 73.1 years; all stage I) were treated using this approach. With this approach, the surgical field was widely exposed, and mandibulectomy was performed with sufficient surgical margins. Intraoperative frozen specimens of remaining tissues showed no malignancy in all cases. In all 6 patients, follow-up imaging assessments were obtained, with no local recurrence after 12 to 78 months. RESULTS AND CONCLUSIONS: An overall functional, physical, and esthetic assessment of oral behavior and oral appearance was made of all patients by the FACT-H&N questionnaire, which showed that functional lip behavior and esthetic lip appearance were not much affected by the present surgical approach, and good quality of life was maintained. Thus, the lateral approach with the mouth corner incision is an effective and useful alternative for the molar part of mandibulectomy.

Influences of FLU/BU and FLU/MEL on incidence and severity of oral mucositis among allogeneic hematopoietic stem cell transplantation patients.

In the present study, we compared the incidence and severity of oral mucositis among patients undergoing allogeneic hematopoietic stem cell transplantation after fludarabine-based regimens with busulfan 12.8 mg/kg (FB12.8), with busulfan less than or equal to 9.6 mg/kg (FB9.6), and with melphalan 140 mg/m2 (FM). The incidence of oral mucositis after FB12.8 was the highest among these 3 groups. After FM, all of the patients had developed oral mucositis by day 7. The mean disease duration of oral mucositis after FB12.8 was 13.5 days, whereas the mean disease duration after FM was 24.9 days, and was significantly prolonged as compared to that after FB12.8 (p=0.0009). The incidence of severe oral mucositis (grade 3) after FM was significantly higher than that after FB12.8 (p=0.03). As stated above, although the incidence of oral mucositis after FB12.8 was higher than that after FM, oral mucositis after FB12.8 showed improvement relatively quickly without deterioration. In contrast, the higher incidence of severe oral mucositis and the delay in resolution of mucositis after FM were remarkable.

Effectiveness of an Interdisciplinary Medical Hospital Admission Center: The Role of the Dental Section in the Interdisciplinary System for Perioperative Management of Patients Awaiting Surgery.

Perioperative oral functional management (POFM) involves total oral management of a patient before surgery. Considerable benefits have been reported, but POFM remains scarce in medical settings. An interdisciplinary Medical Hospital Admission Center (MHAC) opened in our hospital in December 2014, and has since provided unified perioperative management for patients. This study reports on the clinical system and contributions of the systematized, standardized POFM applied through the MHAC. Patients awaiting surgery undergo oral screening before admission, with patients classified into three groups: red, needing surgical oral management (tooth extraction or other oral surgery) before surgery; yellow, needing non-surgical oral management before surgery, due to the planned surgery or the risk of tooth injury in connection with general anesthesia; or green, patients with good oral hygiene considered capable of suitable oral self-management. Patients categorized as red or yellow undergo POFM in the dental section of the MHAC before surgery. Almost all patients (88.8%) awaiting surgery now undergo preoperative oral screening, excluding emergent surgeries. In addition, oral screening is important for preventing tooth injury during endotracheal intubation for general anesthesia, and a need for preventive measures was identified in 6.1% of patients. No traumatic injuries of the teeth in connection with general anesthesia have occurred since the opening of the MHAC. Standardized POFM through an interdisciplinary MHAC thus seems extremely useful.

Perceptual-Speech, Nasometric, and Cephalometric Results After Modified V-Y Palatoplasties With or Without Mucosal Graft.

OBJECTIVE: Although the goal of cleft palate (CP) repair is to achieve normal speech, no standard procedure ensures that patients' speech will be at the same level as speech in children without CP. In this study, postoperative speech outcomes following primary CP repair combined with or without a mucosal graft was analyzed in comparison with that of control subjects without CP. PARTICIPANTS: Eighty-two patients who underwent modified V-Y palatoplasty with a mucosal graft on the nasal side for symmetrical muscular reconstruction during 2006-2012 (MG group) and 109 patients who previously underwent modified V-Y palatoplasty without a mucosal graft (non-MG group) were enrolled in this study. Speech data on 37 Japanese subjects without CP were used as a control. MAIN OUTCOME MEASURES: Perceptual rating of resonance and nasal emission and nasometry were carried out for all participants. Furthermore, cephalometric analyses were performed to assess postoperative velopharyngeal morphology and velar movement. RESULTS: Normal resonance was achieved at a significantly higher rate (90.3% of patients) in the MG group than in the non-MG group (68.8%) (P < .01). The mean nasalance scores in the MG group were significantly lower (P < .01) and were almost at the same level as in controls. Cephalometric analyses revealed a greater velar length and velar elevation angle during phonation in the MG group (P < .01 and P < .05, respectively). CONCLUSIONS: Modified V-Y palatoplasty combined with a mucosal graft on the nasal side of the velum for symmetrical muscular reconstruction facilitates speech outcomes for children with cleft palate that are comparable with those for peers without CP.

Upward Advancement of the Nasolabial Components at Unilateral Cleft Lip Repair Prevents Postoperative Long Lip.

OBJECTIVE: To prevent the occurrence of postoperative long lip, longitudinal postoperative changes in nasolabial forms of patients with unilateral cleft lip who underwent primary lip repair with or without upward advancement of the nasolabial components were compared. PATIENTS: Forty-three subjects (24 unilateral cleft lip and palate [UCLP] and 19 unilateral cleft lip solely, and cleft lip and alveolus [UCL/UCLA]) who underwent primary lip repair with upward advancement of the nasolabial components (NA group) and 30 subjects (16 UCLP and 14 UCL/UCLA) without upward advancement (LA group) were enrolled. OUTCOME MEASURES: Postoperative photos taken at 1 and 6 months and at 1, 2, and 3 years were used for measuring the heights of the nasal alar base (NBH), the columellar base (CBH), Cupid's peak (CPH), and the upper lip (ULH). The ratios of these measurements between the affected and unaffected sides were calculated in both groups. RESULTS: In the LA group, the 3-year postoperative all-items ratios of UCLP were significantly larger than those at 1 month postoperatively, demonstrating drooping of the nasolabial tissues in the affected side (all P < .01). Furthermore, the 3-year postoperative CPH and ULH ratio of UCL/UCLA was significantly larger than that at 1 month postoperatively, demonstrating the long lip (P < .01). In the NA group, the NBH, CBH, and CPH ratios of both UCLP and UCL/UCLA did not show significant differences between 1 month and 3 years postoperatively. CONCLUSION: Upward advancement of the nasolabial components prevents postoperative long lip.

Long-term result of a biodegradable osteo-inductive copolymer for the treatment of orbital blowout fracture.

PURPOSE: We have recently reconstructed the orbital wall using a bioabsorbable osteo-inductive copolymer as a support material for the bone defects in patients with orbital blowout fracture. The purpose of this study was to investigate a 2-year follow-up after implantation. MATERIAL AND METHODS: In order to investigate the efficacy and safety of the bioabsorbable osteo-inductive copolymer HA-P(LA/CL), hydroxyapatite-poly(l-lactide-ε-caprolactone), we measured CT density of the implanted copolymers in 7 patients at such time points as 1 week, 6 months and 2 years after surgery along with the long-term outcomes with regard to postoperative complications. RESULTS: Five patients in whom the intraoperative maximum width of the bone defect was less than 15 mm demonstrated the fracture types of either linear or trap-door. All patients treated with HA-P(LA/CL) copolymer indicated good bone formation with high CT density (>500) at 2 years postoperatively. In contrast, 2 patients in whom the intraoperative maximum width of the bone defect was more than 16 mm demonstrated a punched-out type fracture. Postoperative CT of the HA-P(LA/CL) copolymer showed low density (28.0 and 173.4) at 2 years postoperatively, indicative of limited bone formation. None of the cases demonstrated significant postoperative complications such as diplopia, enophthalmos, infection and extrusion of the implant material. CONCLUSION: The results of this study demonstrate that surgical treatment of orbital blowout fractures using bioabsorbable osteo-inductive copolymer was useful in linear and trap-door fractures.

Short-term molding effects on the upper alveolar arch following unilateral cleft lip repair with/without nasal vestibular expansion.

Objective : To elucidate the various effects on maxillary growth following different procedures for vestibular expansion at the time of primary lip repair for unilateral cleft lip and palate (UCLP). Participants : Thirty patients with complete UCLP who underwent primary lip repair using a triangular-flap technique with nasal vestibular expansion (NVE; the NVE group) and 30 patients who underwent the same lip repair with closure of the nasal floor (non-NVE group) were enrolled in this study. Interventions : Serial dental casts on lip and palatal repair were scanned with a laser scanner. The three-dimensional coordinates of seven anatomical landmarks and their growth changes, the curvature radius rate between major/minor segments, and the collapse rates were compared between the two groups. Results : At the time of lip repair, the incisal point was located slightly anteriorly in the non-NVE group. At the time of palatal repair, the cleft edge of the alveolar process in the minor segment was located significantly anteriorly and laterally in the NVE group, showing the significantly forward change of the minor segment. The minor segment collapsed in the non-NVE group. The collapse rate of the NVE group (3.3%) was significantly lower than that of the non-NVE group (40.0%). Conclusions : NVE following simultaneous advancement of nasolabial components on the affected side at the time of primary lip repair for UCLP facilitates the forward molding of the maxilla, resulting in a more symmetrical alveolar arch form.

Three-dimensional analyses of nasal forms after secondary treatment of bilateral cleft lip-nose deformity in comparison to those of healthy young adults.

PURPOSE: To 3-dimensionally analyze outcomes after the secondary treatment of bilateral cleft lip-nose deformity at the Department of Oral and Maxillofacial Surgery, Kagoshima University Hospital, Kagoshima, Japan. PATIENTS AND METHODS: Ten Japanese male young adults with bilateral cleft lip with or without palate (BCL±P) who had undergone definitive nose correction and were followed up for 1 to 4 years were enrolled in this study. Ten unaffected race- and gender-matched young adults were used as controls. All patients underwent secondary correction of the nose by open rhinoplasty through a bilateral reverse-U incision, columellar strut graft, and medial-upward advancement of the nasolabial components with vestibular expansion by use of a free mucosal graft. In 3 patients with an extremely short columella, an inferiorly based small pedicle flap from rim skin rotated into the columellar base was added for columella lengthening. Nasal forms were periodically measured by use of a 3-dimensional noncontact laser scanner. The angular and linear measurements and the curvature of the alar groove arch were compared between patients and control subjects. RESULTS: Comparison of the preoperative and postoperative nasal forms showed significant improvements in the nasal dorsum and tip angles, as well as nasal height. The size of the nasal alar grooves was also increased to the same size range as the control subjects. There were persistent differences between postoperative columellar angle and nasal width in patients and those in the control subjects. CONCLUSIONS: Our surgical procedures can provide an acceptably protruded nasal form for patients with BCL±P without damaging the upper lip tissue, but further improvement to prevent nasal tip overprojection may be useful.

Association between preoperative inferior rectus muscle swelling and outcomes in orbital blowout fracture.

PURPOSE: In 18 patients with orbital blowout fracture who underwent reconstruction using a bone autograft, the association between preoperative inferior rectus muscle swelling and the outcome 1 year after the operation was evaluated. MATERIAL AND METHODS: The patients were classified according to outcomes into four groups: Group A without double vision showing normal ocular movements, Group B with double vision showing normal ocular movements, Group C with double vision showing improvement in ocular movements, and Group D with double vision showing no improvement in ocular movements. Inferior rectus muscle swelling was evaluated by calculating its swelling rate on the injured compared with the non-injured side on preoperative coronal CT images. RESULTS: Concerning outcomes, 12, 2, and 4 patients were classified as Groups A, B, and C, respectively, and no patient was classified as Group D. The inferior rectus muscle swelling rate was ≤1.2 in Group A, and 1.6-2.4 in Groups B and C. CONCLUSION: In patients in whom inferior rectus muscle swelling on the injured is ≥1.6 times that on the non-injured side on preoperative coronal CT images, double vision and slight impairment of eye movements may remain after surgery.

Treatment of orbital floor fracture using a periosteum-polymer complex.

Various materials for the reconstruction of bone defects in orbital floor fractures have been developed and applied clinically. Recently, reconstruction using polymers, in place of autologous bone and artificial materials, has been actively introduced, but there are problems, such as the size of reconstructable bone defects and the decomposition rate of polymers. A basic study was performed on bone regeneration using a periosteum-polymer complex produced by attaching periosteum to a biodegradable polymer sheet. In this study, patients with orbital floor fractures were evaluated clinically who had undergone reconstruction of orbital floor defects of the using a periosteum-polymer complex produced by applying periosteum to an Hydroxyapatite-[poly (l-lactide-epsilon-caprolactone)](HA-P (CL/LA)) sheet and the ilium in the previous 3 years. A bone defect of less than 2.5cm(2) area was defined as small, that of 2.5-4cm(2) as intermediate, and that of more than 4cm(2) as a large bone defect. For small bone defects, hypoaesthesia in the infraorbital nerve was observed in one patient each of the periosteum-polymer complex and ilium groups. Regarding intermediate bone defects, diplopia and hypoaesthesia in the infraorbital nerve were observed in one patient in each of the two groups. For large bone defects, diplopia was observed in one patient each for the periosteum-polymer complex and ilium groups, and hypoaesthesia of the infraorbital nerve was only detected in one patient of the former group. Not more than 2mm of enophthalmos was detected in any patient. The anatomical eyeball position and eyeball movement were normal after surgical treatment using the periosteum-polymer complex, just as in reconstruction using autologous bone.