Determination of Thickness of Palatal Masticatory Mucosa Using Cone Beam Computerized Tomography and Direct Bone Sounding: A Clinico-Radiographic Study

Palatal masticatory mucosa is the main donor site for soft tissue grafts, thus determination of its thickness is of paramount importance as it affects the surgical outcome. Thus in this study we tried to evaluate and compare the mean thickness of palatal masticatory mucosa with the help of direct bone sounding using a periodontal probe and cone beam computerized tomography (CBCT) at different regions. Methods: 30 subjects in the age group of 20-50years were included in this study and had to undergo bone sounding with periodontal probe and subsequently cone beam computerized tomography in relation to canine, 1st premolar, 2nd premolar, 1st molar and 2nd molar at four different points, i.e., 2, 5, 8 and 12 mm from the gingival margin. Results: On comparison between the two techniques nonsignificant difference was found with slightly higher values obtained by CBCT. The tissue at the premolars was thicker than that measured at the molars. There was also increase in tissue thickness as the distance from gingival margin was increased except for canine at the depth of 12mm. Conclusion: It was concluded that CBCT can be used as non-invasive and accurate method to determine the soft tissue thickness of the palatal masticatory mucosa than clinical measurements made via bone-sounding

The esthetic prosthodontic treatments in maxillary anterior area, considering the gingival margin / 대한치과보철학회지

To enhance the esthetic appearance, the maxillary anterior area is important. It is possible to improve the esthetic appearance through the treatment of maxillary anterior area, which includes altering the color, form, and arrangement of teeth. When planning these treatments, clinicians should individualize personal demands, by using the information obtained from facial, dento-labial, dental, and gingival analysis. It is essential to properly prepare the gingival structure, which includes the height of gingival margin, the location of zenith, reconstruction of the interdental papillae, emergence profile, and symmetry. Clinicians often face unfavorable condition of the gingiva and the edentulous ridge, and appropriate management of the gingival structure is needed. In this case report, the patients were treated to improve the gingival conditions surrounding maxillary anterior teeth. By using conservative treatment without surgical intervention, such as application of pink porcelain, subgingival contour modelling and modification of pontic base, satisfactory esthetic results were gained.

Application of braided retraction cord in dentistry / 中国组织工程研究

10.3969/j.issn.2095-4344.2013.25.022

Agresion gingival con los procedimientos restauradores

Desde los años 50 se plantea la estrecha vinculación entre la Periodoncia y la Odontología Restauradora, cada vez mas las investigaciones demuestran la estrecha relación que existe entre ambas especialidades y la importancia que el Odontólogo Restaurador debe dar a cada una de ellas. Por esta razón se describen los aspectos más relevantes a tomar en cuenta en los procedimientos restauradores para evitar la agresión a los tejidos periodontales y garantizar el pronóstico a largo plazo.

Since 1950 there is a conexion between Periodontics and Restorative Dentistry. In this article we describe all relevants aspects in restorative procedures to avoid aggressions to the periodontal tissue and also to increase the prognosis in long terms.

Effect of resin sealants on the reduction of microleakage in composite restorations / 대한치과보존학회지

The purpose of this study was to compare the ability of three resin surface sealants to prevent microleakage in Class V composite resin restorations. Forty Class V cavities with the occlusal margin in enamel and gingival margin in dentin were prepared on the buccal surfaces of sound extracted molars, and restored with composite resin. Restorations were randomly assigned into one of four equal groups (n = 10): a control group, without resin sealing, and three experimental groups in which margins were sealed with Fortify Plus, Biscover and Permaseal, respectively. Specimens were thermocycled, immersed in a 2% methylene blue solution for 4 hours, sectioned longitudinally, and observed the leakage at the occlusal and gingival margins. The result was analyzed using Kruskal-Wallis test, Mann-Whitney test and Wilcoxon signed rank test. In conclusion, the ability to reduce microleakage at occlusal margins was similar in all of three sealants. However at gingival margin, it depended on the type of used resin surface sealant. At gingival margin, control and Fortify Plus group showed statistically higher microleakage than PermaSeal group, and Fortify Plus group also showed higher microleakage than BisCover group (p < 0.05).

Effect of biscover on the marginal microleakage of composite resin restoration / 대한치과보존학회지

The purpose of this study was to compare the effect on marginal leakage of a resin surface sealant (Biscover) applied before or after polymerization of composite resin to unsealed composite restorations. Thirty Class V cavities with the occlusal margin in enamel and cervical margin in dentin or cementum were prepared on the buccal surfaces of sound extracted molars and restored with a microfilled light-cured composite resin (Micronew). Restorations were randomly assigned into one of three equal groups (n = 10): a control group - no surface sealing, group 1 - applied Biscover after polymerization of the composite resin, and group 2 - applied Biscover before polymerization of the composite resin. Specimens were thermocycled, immersed in a 2% methylene blue solution for 4 hours, sectioned longitudinally, and analyzed for leakage at the occlusal and gingival margins. The results of this study were as follows; 1. In sealed group, group 2 showed higher microleakage than group 1 at both occlusal and gingival margins, but there was no significant difference between two groups (p > 0.05). 2. Unsealed control group showed a little higher microleakage than sealed group at occlusal margins, and a little higher or similar microleakage than sealed group at gingival margins (p > 0.05). 3. Control group and group 2 showed significantly less microleakage at the occlusal margins, but group 1 showed no significantly difference between microleakage at the occlusal and gingival margins.

The effect of marginal microleakge according to thickness of flowable resin / 대한치과보존학회지

This study investigated the effect of thickness of flowable resin lining on marginal leakage in class II composite restorations. 80 experimental teeth were prepared with class II preparations with enamel margin or dentin margin. Each group was devided into four groups according to flowable resin lining thickness ; Control group - no flowable resin lining, Group 1 - 0.5 mm flowable resin lining, Group 2 - 1 mm flowable resin lining, Group 3 - 2 mm flowable resin lining. The cavities were restored using Scotchbond Multi-Purpose adhesive system, Filtek Flow and Filtek Z 250 composite resin. Following one day storage in distilled water, the restored teeth were thermocycled for 500 cycles and immersed in 2% methylene blue for 24 hours. The results of this study were as follows: 1. Ranking of mean microleakage scores at the enamel margins was Group 1 < Control = Group 2 < Group 3. The microleakage of Group 3 was significantly higher than that of Control, Group 1 and Group 2 (p < 0.05). 2. Ranking of mean microleakage scores at the dentin margins was Group 1 < Group 2 < Control < Group 3. The microleakage of Group 3 was significantly higher than that of Control, Group 1 (p < 0.05). 3. Compared with microleakage between the enamel and dentin margins, enamel margin group were significantly lower than dentin margin group.