Effect of acid etching on marginal adaptation of mineral trioxide aggregate to apical dentin: microcomputed tomography and scanning electron microscopy analysis / 国际口腔科学杂志·英文版

The present investigation assessed the effect of acid etching on marginal adaptation of white- and gray-colored mineral trioxide aggregate (MTA) to apical dentin using microcomputed tomography (micro-CT) and scanning electron microscopy (SEM). Sixty-four extracted single-rooted human maxillary teeth were used. Following root-end resection and apical preparation, the teeth were equally divided into four groups according to the following root end filling materials: (i) white-colored MTA (WMTA), (ii) etched WMTA (EWMTA), (iii) gray-colored MTA (GMTA) and (iv) etched GMTA (EGMTA). After 48 h, the interface between root-end filling materials and the dentinal walls was assessed using micro-CT and SEM. Data were statistically analyzed using the Kruskal-Wallis and Dunn tests. Micro-CT analysis revealed gap volumes between the apical cavity dentin walls and EGMTA, GMTA, EWMTA and WMTA of (0.007 1±0.004) mm(3), (0.053±0.002) mm(3), (0.003 6±0.001) mm(3) and (0.005 9±0.002) mm(3) respectively. SEM analysis revealed gap sizes for EGMTA, WMTA, EWMTA and GMTA to be (492.3±13.8) µm, (594.5±17.12) µm, (543.1±15.33) µm and (910.7±26.2) µm respectively. A significant difference in gap size between root end preparations filled with GMTA and EGMTA was found (P<0.05). No significance difference in gap size between WMTA and EWMTA were found in either SEM or micro-CT analysis. In conclusion, pre-etching of apical dentin can provide a better seal for GMTA but not for WMTA.

Association between chronological and skeletal ages among a sample of Saudi male children

Assessment of skeletal maturity is a necessary clinical need in orthodontics and other health professions. The aim of this study was to detect the association between chronological age and skeletal age in a selected Saudi male sample and to compare their skeletal maturity rate with other populations. Hand-wrist radiographs were obtained for 115 subjects and the skeletal age for each subject was determined using a standard hand-wrist radiographic atlas. Also, the skeletal maturity stage for each subject was established using Bjork assessment method. Statistical tests were performed to detect signifcant differences between chronological and skeletal ages at different skeletal maturity stages. The rate of skeletal maturity of the participating Saudi sample was also compared to analogous values that were previously established for other populations. The fndings of the present study indicated that the participating Saudi children had a tendency towards late maturation with the mean skeletal age of the participating subjects being signifcantly lower [P<0.05] than the chronological age at various skeletal maturity stages. When considering the rate of skeletal maturity, the participating Saudi children demonstrated a comparable maturity rate to that of other children from different populations. The results of the present study could enhance the diagnosis and treatment planning in orthodontics, pedodontics, and other health disciplines

Relationship between passive smoking and dental caries in primary teeth among pre-school children in Riyadh city

To study the relationship between dental caries in the primary teeth and passive smoking on a sample of pre-school children in Riyadh, Saudi Arabia. Four schools were randomly selected. A self-administered questionnaire consisteing of 23 items were distributed to all the students in every school to be answered by the child's parents [N=400]. Children who had the questionnaires returned underwent dental examination using WHO criteria. A total of 187 questionnaires were returned [the response rate was 46.75%] from the parents of children aged four to six years. The percentages of male and female children in the study were 48.1% and 51.9 respectively. Results showed that the DMFT for children exposed and not exposed to passive smoking is 5.75 and 5.86 showed no relationshiop between passive smoking and the occurrence of dental caries in primary teeth. Within the limitation of the study, it can be concluded that there is no relationship between passive smoking and caries in primary teeth

Knowledge and satisfaction about dental restorations among patients attending the college of dentistry, King Saud university, Riyadh, KSA: a survey

Objectives: The aims of this study were to investigate patients attending the dental clinics in the College of Dentistry at King Saud University in Riyadh regarding [1] their knowledge about the restorations they received, and [2] their satisfaction about these dental restorations

Materials and Methods: Self-administered questionnaires were distributed to 300 patients, of which 250 questionnaires were suitable for analysis giving a response rate of 83.3%

Results: The results showed that 86.1% [n=210] of the respondents had restorations while 57.7% had posterior fillings only. In participants who had fillings, 46% [n=115] had amalgam restorations and 33.2% had composite restorations. Results of the participants' opinion about the selection of the type of the filling showed that some participants thought it is the dentist only or the patient and the dentist who should determine the type of the filling material [46.0% and 47.2% respectively]. For the anterior fillings, 60.7% preferred while filling. In both anterior and posterior fillings, approximately one third of the participants do not have preference for any type of filling. Data showed that 69.4% of the participants are satisfied with their fillings. Almost half of those dissatisfied [47.5%] was due to the non-acceptance of the color and/or shape of the tooth. Postoperative sensitivity constitutes over one third of the subjects' reasons for dissatisfaction about the filling [37.5%]

Conclusion: Among Saudi patients, there is a deficiency in knowledge about the fillings they received. Majority of the participants were satisfied with the restorations they had. There is need for dental professionals in Saudi Arabia to increase their communication with their patients with the aim to improve the dental knowledge of these patients