Total mesiodistal width of the maxillary anterior teeth correlated with the distance between pterygomaxillary notches; however, measurement of the interpterygomaxillary notch could not be used for tooth selection reliably due to the low standardized coefficient. Within the limitations of this study, the interpterygomaxillary notch distance is not useful for the selection of six maxillary anterior teeth in edentulous patients.

Comparison of mandibular bone mineral density in osteoporotic, osteopenic and normal elderly edentulous subjects measured by the dual-energy X-ray absorptiometry techniqueObjective: The aim of this study was to compare the mandibular body bone mineral density according to bone mineral density status of spine and femur measured by dual-energy X-ray absorptiometry (DXA) technique in elderly edentulous individuals. Background: One of the factors that affect the survival rate of implants is bone mineral density (BMD) of the jaws. Materials and methods: Fifty edentulous elderly patients' (27 women and 23 men) spine, femur and the mandibular body BMDs were measured using DXA technique. BMD scans of the AP lumbar spine (L2-L3) and femur were classified using World Health Organisation criteria for bone mass. Results: There was a statistically significant difference between the normal femur group's-osteoporosis group's mandibular body BMD (p = 0.001) and femoral osteopaenia group's-osteoporosis group's mandibular body BMD (p < 0.001). The femoral osteoporosis group's mandibular body BMDs were lower than those of both the normal femoral and the femoral osteopaenia group subjects'. Conclusion: Classification of edentulous mandibles according to low and high bone mineral densities is a problem in implant dentistry. The results of this study demonstrated that femoral bone mineral density status may be used to provide preliminary information about the bone mineral density of the mandibular body region in elderly edentulous subjects.

ObjectivesThe aim of the present study was to determine the vertical distance between maxillary central incisors and incisive papilla.MethodsThe vertical distance between incisal edges of maxillary central incisors and the centre of the incisive papilla was measured by a digital caliper on the stone casts that were obtained from dentate subjects.ResultsThe mean vertical distance between maxillary central incisors and incisive papilla on the stone casts was 6.70±0.81 mm. The vertical distance range was 5.51 mm to 8.89 mm.ConclusionsThe clinical relevance of this study lies in application to complete denture construction. The dentist and laboratory technician can be use the results of this study as a guideline in fabrication of maxillary occlusal rims and in determination of the position of the occlusal plane with the reference of other anatomical landmarks together. However, the wax rim should be modified intraorally to incorporate individual characteristics and the anterior tooth should be arranged on modified wax rim.

Chemical erosion is the loss of superficial tooth structure by chemical action in the continued presence of demineralizing agents. This can be prominent in patients with oral habits such as constant citrus ingestion (like lemon chewing), chlorinated swimming pool water or gastrointestinal problems that produce repeated exposure of teeth to gastric acids. In this case report, a multidisciplinary approach to restore the severe wear due to dental erosion by proper techniques and materials was presented.

Comparison of the mandibular body BMD revealed that dentate patients had less dense bone than the edentulous patients. Further investigations are needed to determine the BMD of the jaws in different regions and for different systemic conditions.

Various prosthodontic restorative materials had wear characteristics affecting each other.

Objectives: Fluoride is one of the biological trace elements with a strong affinity for osseous, cartilaginous and dental tissue. The dental and skeletal effects of high fluoride intake have already been studied in the literature, but little is known about the effects of high fluoride intake on edentulous mandibles. The purpose of this study was to evaluate the effects of high fluoride intake on mandibular bone mineral density (BMD) measured by the dualenergy X-ray absorptiometry (DXA) technique in edentulous individuals with systemic fluorosis. Methods: 32 people who were living in an endemic fluorosis area since birth and 31 people who were living in a non-endemic fluorosis area since birth (control group) participated in this study. Systemic fluorosis was diagnosed in the patients using the sialic acid (NANA)/ glycosaminoglycan (GAG) ratio. The BMDs of the mandibles were determined by the DXA technique. Results: The serum NANA/GAG ratios in the fluorosis group were significantly lower than those in the control group (p , 0.001). There was also a statistically significant difference in mandibular BMD measurements (p , 0.05) between the systemic fluorosis and control groups, as measured by the DXA technique. Mandibular body BMD measurements were higher in the fluorosis group (1.25¡0.24 g cm 22 ) than in the control group (1.01¡0.31 g cm 22 ). Conclusions:The results of the study showed that fluoride intake higher than the optimum level causes increased mandibular BMD in edentulous individuals. Further dose-related studies are needed to determine the effects of high fluoride intake on bony structures of the stomatognathic system.

The results of this study show that adhesion may be seen between restorative materials and irreversible hydrocolloid impression materials, and this adhesion may affect the accuracy of the impression.